JP6516838B2 - Hot water heating system, control device and control method - Google Patents

Description

  The present invention relates to a hot water heating system for heating a building and a control device and control method for the hot water heating system.

  BACKGROUND A hot water heating system is known which performs heating by circulating hot water heated by heat generated by a heat source unit using a heat pump. Moreover, in control of a hot-water heating system, it is known to repeat stop and drive of a heat source machine according to room temperature etc. for reasons, such as energy saving. Specifically, when the set temperature is lower than room temperature or when the required amount of heat is lower than the minimum value when operating the heat source machine, the heat source machine is stopped. Then, after the heat source machine is stopped, the room temperature drops due to the influence of the outside air or the like with the lapse of time, and the operation of the heat source machine is restarted when the room temperature becomes lower than the set temperature. For example, Patent Literature 1 describes a hot water heating apparatus that detects hot water temperature on the forward path side and performs feedback control according to a target temperature set in advance. In the hot water heating apparatus of Patent Document 1, when the hot water temperature on the outgoing side rises to a predetermined extinction temperature, the operation of the heat source unit is stopped and the hot water temperature on the outgoing side reaches a predetermined reignition temperature lower than the target temperature. If it falls, the operation of the heat source unit is resumed.

JP, 2013-217604, A (refer to claim 1)

  When controlling the outlet temperature in a hot water heater such as a radiator or floor heating to match the preset temperature, it is necessary to stop the operation of the heat source unit if the required heat quantity becomes less than the minimum heating value of the heat source unit. When the outlet temperature falls below the set temperature, it is necessary to restart the operation of the heat source unit. Here, in the conventional hot water heating apparatus, when resuming the operation of the heat source unit, the heat source unit is controlled by a preset heat supply command in which the thermal characteristics of the actual building are not considered. In this case, if the heat supply command set in advance is larger than the amount of heat originally required for the building, the outlet temperature may exceed the upper limit and stop again, and operation and stop are repeated in a short time. There is. As a result, the durability and energy saving performance of the actuator may be impaired. In addition, when the heat supply command set in advance is smaller than the amount of heat which is originally required, the temperature of the hot water does not rise sufficiently, so that the room temperature hardly rises and the comfort is impaired.

  In addition, to save energy, the set temperature of heating may be lowered during absence or at night, and heat supply by the heat source machine may be stopped. However, if the room temperature falls below the set temperature, the set temperature of heating when returning home or in the morning The heat source machine resumes heat supply, for example, by raising it. At this time, if the heat supply is resumed by the outlet temperature command of the predetermined temperature set in advance, the outlet temperature command information adjusted by the heating control by just before the stop of the heat supply can not be utilized, and the feedback control from one place Will be reorganized. As a result, heating control becomes discontinuous, and the time required to stabilize the room temperature becomes long. Especially when the set temperature rises before the room temperature drops to the set temperature, especially in a highly airtight / high insulation house, the discontinuity of heating control makes it take time for the room temperature to reach the set temperature, which is a comfort Will be lost.

  The present invention has been made to solve the problems as described above, and it is an object of the present invention to provide a hot water heating system, a control device, and a control method that realize energy saving without impairing comfort.

  A hot water heating system according to the present invention includes a room temperature sensor that detects room temperature information of a building, a heat source unit that generates warm water, an indoor unit that releases heat of warm water generated by the heat source unit to heat the building, and a heat source A heat source unit including a compressor for compressing a refrigerant, a refrigerant-water heat exchanger for exchanging heat between the refrigerant and water, a hot water for the refrigerant-water heat exchanger, and a room And a control pump for determining the first gain and the second gain based on the thermal characteristics of the building, and the control gain determining unit using the first gain and the second gain. The heating control unit updates the hot water outlet temperature command, which is the target value of the outlet temperature of the refrigerant-water heat exchanger, and the air conditioning control unit when the indoor unit supplies heat to the building, is updated by the heating control unit Outgoing water temperature that issues a heat supply command to the heat source machine based on the outgoing water temperature command The first gain is designed to obtain a hot water outlet temperature command to achieve a desired room temperature response when the air conditioning is ON, and the second gain is for the indoor unit to go to the building. It is designed to obtain a hot water outlet temperature command reflecting room temperature change in the case of air conditioning OFF which does not supply heat, and the heating control unit, when the air conditioning is ON, sets the room temperature, room temperature information and the first gain And the outlet temperature command is updated, and in the case of the air conditioning OFF, the outlet temperature command is updated using the set temperature, the room temperature information, and the second gain.

  According to the hot water heating system of the present invention, the outlet temperature command is updated using the set temperature, the room temperature information, and the second gain even when the air conditioning is OFF. As a result, the operation is resumed based on the updated outlet hot water temperature command, and the outlet hot water temperature from the air conditioning OFF to the air conditioning ON can be made continuous. Therefore, the state before air conditioning OFF can be taken over, and the energy saving effect can be obtained without impairing the room temperature comfort.

It is a schematic block diagram of the hot water heating system in Embodiment 1 of this invention. It is a schematic block diagram of the warm water circulation circuit in Embodiment 1 of this invention. It is a functional block diagram of a control device in Embodiment 1 of the present invention. It is a figure which shows the flow of heating control by the heating control part in Embodiment 1 of this invention, a hot water outlet temperature control part, a system identification part, and a control gain determination part. It is a flowchart which shows the flow of the system identification process in Embodiment 1 of this invention. It is a figure which shows the example of the sampling in the system identification part of Embodiment 1 of this invention. It is a block diagram of the heating control part in Embodiment 1 of this invention. It is a flowchart which shows the flow of the heating control processing in Embodiment 1 of this invention. It is a figure which shows an example of the simulation result of the hot water heating system in Embodiment 1 of this invention. It is a figure which shows the flow of heating control by the heating control part in Embodiment 2 of this invention, a hot water outlet temperature control part, a system identification part, and a control gain determination part. It is a block diagram of the heating control part in Embodiment 2 of this invention. (A) is a thermal network model to be controlled, (b) is a thermal network model when there is a heat supply from the indoor unit, and (c) is a case where there is no heat supply from the indoor unit It is a thermal network model. It is a schematic block diagram of the warm water circulation circuit in Embodiment 3 of this invention. It is a functional block diagram of a control device in Embodiment 3 of the present invention. It is a figure which shows the flow of heating control by the heating control part in Embodiment 3 of this invention, a hot water outlet temperature control part, a system identification part, and a control gain determination part. It is an example of determination of the gain selection signal in Embodiment 3 of this invention. It is a flowchart which shows the flow of the system identification process in Embodiment 3 of this invention. It is a flowchart which shows the flow of the heating control processing (at the time of air-conditioning OFF) in Embodiment 3 of this invention. It is a figure which shows the flow of heating control by the heating control part which uses return temperature information in Embodiment 3 of this invention, a hot water outlet temperature control part, a system identification part, and a control gain determination part.

Hereinafter, an embodiment of a hot water heating system according to the present invention will be described in detail based on the drawings.
Embodiment 1
FIG. 1 is a schematic configuration diagram of a hot water heating system 100 according to Embodiment 1 of the present invention. The hot water heating system 100 has a room temperature sensor 2 that measures the room temperature of the house 1 that is a building to be heated, a heat source unit 3 that generates warm water used for heating, and a room temperature detected by the room temperature sensor 2 The control unit 4 supplies a heat supply command to the heat source unit 3, and the indoor unit 5 heats the room by releasing the heat of the hot water supplied from the heat source unit 3 into the room.

  FIG. 2 is a schematic configuration diagram of the hot water circulation circuit in the present embodiment. The hot water circulation circuit is configured by connecting a heat source unit 3 having a heat pump cycle and an indoor heat exchanger 51 provided in the indoor unit 5. As shown in FIG. 2, the heat source unit 3 includes a compressor 31, an outdoor heat exchanger 32, a fan 33, a refrigerant flow control device 34, a refrigerant-water heat exchanger 35, and a circulation pump 36. . Furthermore, the heat source unit 3 includes a heat source unit control unit 37 that controls each unit of the heat source unit 3.

  As shown in FIG. 2, the compressor 31, the outdoor heat exchanger 32, the refrigerant flow rate adjustment device 34, and the refrigerant-water heat exchanger 35 are connected in series by the heat source side flow passage 30. A refrigerant for transferring heat is circulated in the heat source side flow passage 30. Further, the refrigerant-water heat exchanger 35, the indoor heat exchanger 51, and the circulation pump 36 are connected in series by the use side flow path 50. Water is circulated in the use side flow passage 50 as a heat medium for transferring heat. The compressor 31 compresses the refrigerant drawn from the suction side, and discharges it from the discharge side as a high-temperature, high-pressure gas refrigerant. The outdoor heat exchanger 32 functions as a refrigerant evaporator during heating operation, exchanges heat between outdoor air and the refrigerant, and absorbs heat from outdoor air. The fan 33 blows air to the outdoor heat exchanger 32, and adjusts the heat absorption in the outdoor heat exchanger 32. The refrigerant flow control device 34 is, for example, an electronic expansion valve, and adjusts the flow rate of the refrigerant flowing through the refrigerant-water heat exchanger 35.

  The refrigerant-water heat exchanger 35 functions as a condenser of the refrigerant at the time of heating operation, and performs heat exchange between the refrigerant circulating in the heat source side flow passage 30 and the water circulating in the use side flow passage 50. Thereby, the flow paths of the heat source side flow path 30 and the use side flow path 50 which are mutually independent are thermally connected. In addition, as a heat medium which circulates the inside of the utilization side flow path 50, you may use antifreeze liquid or the liquid mixture of water and antifreeze liquid etc. instead of water. The circulation pump 36 regulates the flow rate of the warm water warmed via the refrigerant-water heat exchanger 35. The hot water circulating in the use side flow path 50 releases heat by the indoor heat exchanger 51 and is warmed again via the refrigerant-water heat exchanger 35.

  Further, the heat source unit 3 is provided at the outlet side of the refrigerant-water heat exchanger 35 in the use-side flow passage 50, and at the inlet side of the refrigerant-water heat exchanger 35, the outlet temperature sensor 21 detecting the outlet temperature. A return temperature sensor 22 is provided that detects the return temperature of the water that has been circulated through the indoor heat exchanger 51, and a flow rate sensor 23 that detects the flow rate of water circulating through the use-side flow path 50. The information detected by these sensors is transmitted to the heat source controller 37 by analog communication or digital communication. The heat source controller 37 controls the operating capacity of the compressor 31, the air volume of the fan 33, the opening degree of the refrigerant flow control device 34, and the circulation pump 36 based on the heat supply command from the controller 4 and the information from each sensor. Control the flow rate etc.

  FIG. 3 is a functional block diagram of control device 4 in the present embodiment. As shown in FIG. 3, the control device 4 controls the input / output unit 41 that exchanges information with the room temperature sensor 2, the heat source unit 3 and the indoor unit 5, the storage unit 42 that stores various information and programs, and control of each unit. And a control unit 43.

  The input / output unit 41 includes a digital input unit 411, an AD conversion unit 412, a serial communication unit 413, and a display unit 414. The digital input unit 411 receives operation information of the indoor unit 5 or the heat source unit 3, switch information of the control device 4, or a flow switch (not shown) as a digital signal. The AD conversion unit 412 converts analog information from the room temperature sensor 2, the hot water outlet temperature sensor 21, and the return temperature sensor 22 into digital information. The serial communication unit 413 is an interface for exchanging various setting information or each sensor information with the indoor unit 5 or the heat source unit 3 by serial communication. The serial communication unit 413 may also receive room temperature information by wireless communication from a remote controller (not shown) of the indoor unit 5 or the like. The display unit 414 displays information such as the set temperature, the current room temperature, or the outlet water temperature on the liquid crystal screen.

  The storage unit 42 is configured by a non-volatile memory or the like. The storage unit 42 includes initial setting values such as initial control gain before system identification completion, various sensor information from the input / output unit 41, thermal characteristics of the house 1 calculated by the system identification unit 433, and control gain determination unit 434. The designed control gain, heat supply command data to the heat source unit 3, and input data input via the input / output unit 41 are stored.

  The control unit 43 is configured by a microcomputer or a DSP (Digital Signal Processor). The control unit 43 includes a heating control unit 431, a hot water outlet temperature control unit 432, a system identification unit 433, a control gain determination unit 434, a mode determination unit 435, and an output data processing unit 436. The above-described units are realized by executing a program stored in a recording medium such as the storage unit 42 by a CPU (not shown) provided in the control unit 43 as a functional unit realized by software. Alternatively, each unit may be realized by an electronic circuit such as an application specific IC (ASIC), a field programmable gate array (FPGA), or a programmable logic device (PLD).

  FIG. 4 is a diagram showing the flow of heating control by heating control unit 431, outlet temperature control unit 432, system identification unit 433 and control gain determination unit 434 in the present embodiment. As shown in FIG. 4, the system identification unit 433 calculates the thermal characteristic of the house 1 from the room temperature information acquired from the room temperature sensor 2 of the house 1 and the outlet water temperature command from the heating control unit 431, and the control gain determination unit 434 Output to The control gain determination unit 434 calculates a plurality of control gains in the heating control unit 431 based on the thermal characteristic of the house 1 calculated by the system identification unit 433. The heating control unit 431 generates a gain selection signal based on the room temperature information and the like, and outputs the generated signal to the control gain determination unit 434. The control gain determination unit 434 determines the control gain according to the gain selection signal, and outputs the control gain to the heating control unit 431.

  The heating control unit 431 generates a outlet temperature command from the control gain calculated by the control gain determining unit 434, the set temperature, and the room temperature information acquired from the room temperature sensor 2, and outputs the outlet temperature instruction to the outlet temperature control unit 432. The outlet temperature command is a target value of the temperature (outlet temperature) of water flowing through the use-side flow passage 50 at the outlet side of the refrigerant-water heat exchanger 35. The outlet temperature control unit 432 generates a heat supply command to the heat source unit 3 from the outlet temperature command acquired from the heating control unit 431 and the outlet temperature information acquired by the outlet temperature sensor 21 of the heat source unit 3. The heat supply command is a control target value in the heat source unit 3. The heat source unit control unit 37 of the heat source unit 3 controls the operating capacity of the compressor 31 and the like in response to the heat supply command from the hot water outlet temperature control unit 432 to carry out the heat supply to the house 1.

  Referring back to FIG. 3, the mode determination unit 435 determines a mode such as heating or hot water supply according to the input data from the input / output unit 41. Further, the output data processing unit 436 processes output data for the input / output unit 41.

Next, the calculation of the thermal characteristic of the house 1 by the system identification unit 433 will be described. Assuming that the thermal characteristic of the house 1 is the transfer function of the first-order lag system, the transfer function from heat quantity to room temperature is represented by the following formula (1).

Here, s is a Laplace operator, y is an output, x is a state variable, K _r is a proportional coefficient of thermal characteristics of house 1, τ _r is a time constant of thermal characteristics of house 1, u is a manipulated variable. When the equation (1) is discretized by the backward difference of the following equation (2), the following equation (3) is obtained.

  Here, Ts is a sampling period, z is a lead element, x [k] is a discretized state variable, x [k-1] is a discretized state variable one sample before, u [k-1] is This is the amount of operation one sample before. The following equation (4) can be obtained by modifying equation (3).

The equation (4) is data of one point, and the system identification unit 433 obtains the state variable x and the manipulated variable u of multiple points, and the proportional coefficient K _r of the thermal characteristic of the house 1 and the thermal characteristic of the house 1 Calculate the time constant τ _r of For example, when the state variable x and the manipulated variable u are four points, the following equation (5) is obtained, and in the time series data, the left side vector is α, the right side matrix is β, and the right side vector is γ From (6), the proportional coefficient K _r of the thermal characteristics of the house 1 and the time constant τ _r of the thermal characteristics of the house 1 are obtained by the least squares method using a pseudo inverse matrix.

Here, the subscripts of the discretized state variable x [k] of equation (5), the discretized state variable x [k-1] of one sample earlier, and the manipulated variable u [k-1] are data It is a number. When the resolution of the state variable x or the manipulated variable u is high, the accuracy of system identification improves as the number of data points increases. However, when the accuracy or resolution of the microcomputer used for the control device 4 or the AD converter mounted on the control board on which the microcomputer is mounted is low, for example, the detection resolution of room temperature corresponding to the state variable x is about 0.1 ° C. In some cases, an independent data group of formula (4) may not be obtained. In this case, the sampling period T _s fixed in the equation (5) is replaced with a change sampling period T _sn (n is a data number) which is the time until the state variable changes, and the operation amount u is integrated value u _{It replaces with n_sum} (n is a data number), and _sets the sampling period Ts for change determination to about 10 seconds or less. Thereby, the roughness of the detection resolution can be compensated. Also, by setting the value of x _n [k] -x _n [k-1] in advance, the thermal characteristics of the house 1 can be calculated while controlling the heating even when an inexpensive microcomputer is installed in the control device 4 can do. In this case, equation (5) becomes equation (7).

  When the room temperature information from the room temperature sensor 2 is received by wireless communication from a wireless device such as a remote controller instead of wired communication, the cycle of wireless communication becomes long due to the problem of battery life. In this case, by receiving the information on the elapsed time together with the room temperature information, even if the wireless communication cycle is 10 seconds or more, the change in the room temperature can be determined by the control device 4, and system identification Accuracy can be improved.

FIG. 5 is a flowchart showing the flow of the system identification process of the present embodiment. FIG. 5 is an example in which the thermal characteristic of the house 1 is calculated based on the time-series data of 4 points, where the value of x _n [k] −x _n [k−1] is 0.5. The value of x _n [k] −x _n [k−1] and the number of time series data are not limited to this. As shown in FIG. 5, in the present process, first, the state variable x at the start of system identification and the operation amount u are acquired as initial data and stored in the storage unit 42 (S1). And heating control by heating control part 431 is performed using an initial control gain memorized by storage part 42 (S2). This initial control gain may be preset based on the data of the test facility, or if building data such as heat insulation or heat capacity of each house 1 can be obtained, the value may be preset according to reference. Good. In the present embodiment, the system identification unit 433 performs system identification while performing heating control with the initial control gain.

Next, it is determined whether four points of data have been acquired (S3). Data referred to here is a state variable _{x n,} the integrated value _{u N_sum} manipulated variable u, and changes the sampling period _{T sn} used for calculating the thermal characteristics of the house 1. Then, if the data of 4 points is not acquired (S3: NO), it is judged whether the room temperature has increased by 0.5 ° C. or more from the room temperature stored previously (S4). Then, if the room temperature has not risen by 0.5 ° C. or more from the room temperature stored last time (S4: NO), 1 is added to the sample count cnt (S5), and the operation amount u is integrated (S6). Then, the process returns to step S2, and the subsequent processing is repeated.

On the other hand, when the room temperature rises 0.5 ° C. or more from the room temperature stored last time (S4: YES), the state variable x _n , the integrated value _{un_sum} of the operation amount u, and the change sampling period T _sn are stored (S7). The state variable x _n is the room temperature detected by the room temperature sensor 2, and the integrated value _{un_sum} of the operation amount u is the integrated value of the outlet temperature command generated by the heating control unit 431. Here, the heating control unit 431 generates a tapping temperature command using the set temperature, the room temperature, and the initial control gain. Also, the change sampling period T _sn is obtained from the following equation (8) using the sample count cnt and the sampling period T _s .

Thereafter, the sample count cnt is reset (S8), and the process returns to step S2 to repeat the subsequent processing. Then, when data of four points different from the initial data at the start of system identification is acquired (S3: YES), based on the acquired data, the time constant τ _r of the thermal characteristic of the house 1 and the proportional coefficient K _r Is calculated (S9).

FIG. 6 is a diagram showing an example of sampling in the system identification unit 433 of the present embodiment. FIG. 6 shows a sampling example when the state variable x is room temperature and the operation amount u is a hot water outlet temperature command. P ₀ is the room temperature at the start of system identification, and the room temperature increased by 0.5 ° C. based on this room temperature is P ₁ . The change sampling time T _{s1 in} this case and the integrated value u 1 _{_sum} of the outlet temperature command are represented as shown in FIG. Also, P ₁ corresponds to a room temperature of x ₂ [k-1] and x ₁ [k]. When the room temperature has risen further 0.5 ℃ from room temperature _{P 1} and _{P 2,} the integrated value _{u 2_Sum} change sampling time _{T s2} and tapping temperature command from _{P 1} to change to _{P 2,} the table as shown in FIG. 6 Be done. The same applies to P ₃ and P ₄ . In the present embodiment, the operation amount u is the outlet temperature command in the heating control unit 431, but may be the outlet temperature detected by the outlet temperature sensor 21. However, when using the outlet temperature, it is necessary to take measures against noise in the outlet temperature information. When the outlet temperature is used, the response of the control system of the outlet temperature control unit 432 is not taken into consideration, so it is desirable to use the outlet temperature command as the operation amount u.

Next, determination of the control gain in the control gain determination unit 434 will be described. In the following, the case where the heating control unit 431 has a PI controller (not shown) and performs PI control based on the room temperature and the set temperature, and the case where the design is set to extreme zero cancellation will be described. The control gain determination unit 434 is a control gain in PI control of the heating control unit 431 based on the proportional coefficient K _r of the thermal characteristic of the house 1 and the time constant τ _r of the thermal characteristic of the house 1 calculated by the system identification unit 433. Calculate Further, the control gain determination unit 434 calculates the gain for compressor ON when the compressor 31 of the heat source unit 3 is operating and the gain for compressor OFF when the compressor 31 is stopped. Do. In addition, the gain for compressor ON corresponds to the "1st gain" of this invention, and the gain for compressor OFF corresponds to the "2nd gain" of this invention.

Specifically, the PI controller of the heating control unit 431 designed in a continuous system is expressed by the following equation (9). Where τ _c is the design time constant of the PI controller and s is the Laplace operator.

Also, using the proportional gain K _p , the integral gain K _i , and the Laplace operator s, the PI controller is expressed by the following equation (10).

Further, _assuming that the design time constant of the PI controller gain when the compressor 31 is operating is τ _{c_ON} , the proportional gain K _{p_ON} and the integral gain _{Ki_ON,} which are gains for compressor ON, are _expressed by the following equation (11) And equation (12).

Further, when the design time constant of the PI controller gain and tau _{C_off} when the compressor 31 is stopped, a compressor OFF gain proportional gain _{K P_OFF} and the integral gain _{K I_off} each of the following formula (13 And equation (14).

Here, the design time constant τ _{c_ON} of the PI controller gain when the compressor 31 is operating depends on the dead time determined by the total amount and flow rate of hot water flowing through the use-side flow passage 50, but the dead time is long It is about 10 minutes. Therefore, when setting the design time constant τ _{c_ON} so that the room temperature does not overshoot, it is _sufficient to set τ _{c_ON} at least 2.6 times the dead time. For example, _assuming that the dead time is 10 minutes, τ _{c_ON} is approximately 1600 seconds. Further, in the case of FIG. 6, the dead time can be obtained by measuring the time when the room temperature starts to rise from the time when the tapping temperature command rises. Further, the design time constant τ _{c_OFF} of the PI controller gain when the compressor 31 is stopped is the time constant τ _r of the thermal characteristic of the house 1. If the time constant τ _r and proportional coefficient K _r of the thermal characteristics of the house can be predicted from the thermal insulation at the time of designing the house 1 and the catalog data of the indoor unit 5, design the control gain using the predicted value May be Control gain determination unit 434 determines either the compressor ON gain or the compressor OFF gain calculated as described above based on the gain selection signal of heating control unit 431, and outputs the same to heating control unit 431. .

  Next, the heating control of the heating control unit 431 will be described. The heating control unit 431 determines which one of the gain for compressor ON and the gain for compressor OFF is to be used from the room temperature information from the room temperature sensor 2 and the like. For example, when one or more of the deviation between the set temperature and the room temperature is 0 or more, the outlet temperature command is larger than the lower limit value, and the heat quantity equivalent value is larger than the minimum calorific value of the heat source unit 3, Choose a gain. On the other hand, when the deviation between the set temperature and the room temperature is less than 0, and when the outlet temperature command becomes the lower limit value, one or more of the heat quantity equivalent value is less than 0, the compressor OFF gain is selected. Do. Then, this result is generated as a gain selection signal, and is output to the control gain determination unit 434.

Further, the heating control unit 431 updates the hot water outlet temperature command based on the compressor ON gain or the compressor OFF gain determined by the control gain determination unit 434. FIG. 7 is a block diagram of the heating control unit 431 in the present embodiment. The heating control unit 431 performs control calculation for each control cycle _Tc based on the room temperature deviation obtained by subtracting the room temperature information detected by the room temperature sensor 2 from the set temperature, and updates the hot water outlet temperature command. Control period T _c is either a sampling period T _s and the equivalent, is an integer multiple of the sampling period T _s.

Proportional gain in _{K p} is the input control gain determining unit 434 proportional gain _{K P_On} or _{K P_OFF} calculated in is the integral gain _{K I_ON} or _{K I_off} is input to the integral gain _{K i.} Further, the heating control section 431, the arithmetic tapping temperature command results to determine is within the upper and lower limit limiter, before the limiter process hot water temperature instruction and the difference between the tapping temperature command after the limiter processing of the proportional gain K _p Perform anti-reset windup process using reciprocal. By this processing, even when the outlet temperature command reaches the upper and lower limit values, the outlet temperature command does not stick to the upper and lower limit values and changes rapidly, thereby suppressing the overshoot at room temperature, thereby achieving an energy saving effect.

FIG. 8 is a flow chart showing the flow of the heating control process in the present embodiment. In this process, first, the control gain determination unit 434 uses the time constant τ _r of the thermal characteristics of the house 1 obtained by the system identification unit 433 and the proportional coefficient K _r of the thermal characteristics of the house 1 to generate a compressor. A gain for ON and a gain for compressor OFF are calculated (S21). Then, a gain selection signal is acquired from the heating control unit 431 (S22), and it is determined based on the acquired gain selection signal whether or not to select a compressor ON-use gain (S23).

  Here, when the compressor ON gain is selected (S23: YES), the compressor ON gain is output to the heating control unit 431. Then, the heating control unit 431 performs heating control calculation using the compressor ON gain, and the hot water outlet temperature command is updated (S24). Thereafter, the updated outlet temperature command is output to the outlet temperature control unit 432 (S25). When the compressor ON gain is not selected (S23: NO), that is, when the compressor OFF gain is selected, the compressor OFF gain is output to the heating control unit 431. Then, the heating control unit 431 performs a heating control calculation using the compressor-off gain, and the outlet temperature command is updated (S26). In this case, since the compressor 31 is stopped, the output of the outlet temperature command to the outlet temperature control unit 432 is not performed, and only the outlet temperature instruction in the heating control unit 431 is updated. Then, according to the room temperature information and the like, the heating control unit 431 outputs a gain selection signal to the control gain determination unit 434, and the processing from step S22 to step S26 is repeated.

  Next, the generation of the heat supply command of the outlet hot water temperature control unit 432 will be described. The outlet temperature control unit 432 performs PI control for matching the outlet temperature command from the heating control unit 431 and the outlet temperature information from the outlet temperature sensor 21, and generates a heat supply instruction to the heat source unit 3. The equation for PI control is similar to equation (10). The control gain of the tapping temperature control unit 432 is calculated by performing system identification using the state variable x in equation (5) as tapping temperature information and the operation amount u as a heat supply command.

FIG. 9 is a diagram showing an example of a simulation result in the hot water heating system 100 of the present embodiment. FIG. 9 (a) shows the transition of the outlet temperature command, FIG. 9 (b) shows the gain selection signal, and FIG. 9 (c) shows the transition of the room temperature. As simulation conditions, the set temperature at home (16 hours) is 22 ° C., and the set temperature at absence (8 hours) is 20 ° C. Further, the time constant τ _r of the thermal characteristic of the house 1 is 20000 seconds (about 5.6 hours), the proportional coefficient K _r of the thermal characteristic of the house 1 is 0.6, and the time constant τ _{c_ON} at the time of the compressor ON is 3600 seconds I assume. In Fig.9 (a), a continuous line shows the outlet temperature command in the warm water heating system 100 of this Embodiment, and a broken line shows the outlet temperature instruction | command in a prior art. Moreover, in FIG.9 (c), a continuous line shows room temperature at the time of using the warm water heating system 100 of this Embodiment, a broken line shows the room temperature in the case of using the warm water heating system of a prior art, and a dashed dotted line shows warm water. Indicates the set temperature for the heating system.

As shown in FIG. 9A, in the present embodiment, when the set temperature is changed to 20 ° C. in the absence, the gain selection signal is turned OFF (compressor OFF), and the control gain in the heating control unit 431 is compressed. It is changed to the gain for machine OFF. Thereby, the time constant in the heating control unit 431 becomes the time constant τ _r of the thermal characteristic of the house 1, and the value of the outlet temperature command when the set temperature is raised from 20 ° C. to 22 ° C. The reflected value (about 33 ° C.) is obtained. As a result, the room temperature response to the set temperature 22 ° C. is as designed. On the other hand, in the prior art, since the predetermined temperature (25 ° C.) set in advance is used as the hot water outlet control command value when the compressor 31 is stopped, the room temperature response becomes slower than designed. Thus, in the present embodiment, the set temperature is particularly high in a so-called high heat insulation / airtightness house where the time constant of the thermal characteristics of the house 1 is long with respect to the set temperature lowering command to the setting time of the raising command. The effect of improving the followability can be obtained.

  As described above, according to the present embodiment, even when the compressor 31 is stopped, it is appropriate to resume the operation of the compressor 31 by updating the outlet temperature command using the compressor OFF gain. Control can be started by the hot water outlet temperature command. Moreover, since the hot water temperature at the time of operation resumption of the compressor 31 becomes continuous from the hot water temperature before the stop and the state before the stop of the compressor 31 can be taken over, the room temperature comfort is not impaired. Energy saving effect can be obtained. In addition, by calculating the thermal characteristics of the actual house 1 in the system identification unit 433, the thermal characteristics of the indoor unit 5 such as floor heating, radiator, fan coil unit, etc. and the house 1 are different. Even when different wooden, concrete, brick, etc. houses 1 are combined, the room temperature can be controlled comfortably.

Further, the system identification unit 433 calculates a proportional coefficient K _r and the time constant tau _r thermal properties of the house 1, the control gain determining unit 434 in the heating control section 431 constant tau _r when the thermal properties of the house 1 By calculating the gain for compressor-off as the design time constant, the hot water outlet temperature command is lowered in accordance with the natural heat radiation characteristic of the house 1. As a result, the temperature of the hot water at the time of resumption of operation of the compressor 31 reflects the room temperature change condition, and the room temperature control characteristic can be improved.

  Also, in the system identification unit 433, the heating control unit 431 uses the outlet temperature command generated by using the set temperature, the room temperature information, and the initial control gain as an input variable, and uses the room temperature information of the house 1 as an output variable. By calculating the thermal characteristics of 1, it is possible to calculate the thermal characteristics of the house 1 including the delay of the hot water outlet temperature control system, and the accuracy of system identification is improved. As a result, the comfort of the heating control is improved, and the overshoot at room temperature is less likely to occur, so that the energy saving property can be improved.

  Further, by calculating the thermal characteristics of the house 1 based on a plurality of time series data with different sampling cycles in the system identification unit 433, the time until the change can be included in the time series data, and the measurement of the room temperature Even if the resolution is coarse, the roughness can be compensated by the time data. As a result, the accuracy of system identification can be improved.

  Furthermore, by providing the outlet temperature control unit 432, it is possible to suppress the heat supply fluctuation from the heat source unit 3 by the outlet temperature control system, and to reduce the influence on the upper heating control system.

Second Embodiment
Next, a second embodiment of the present invention will be described. In the first embodiment, the hot water temperature command from heating control unit 431 is used as an input variable, and system identification is performed using room temperature information from room temperature sensor 2 as an output variable, while heating control unit 431 is used in the second embodiment. The second embodiment differs from the first embodiment in that the outlet temperature command from the second and the return temperature information from the return temperature sensor 22 are used as input variables. The other configurations of the hot water heating system 100 and the respective devices are the same as those of the first embodiment, and the same reference numerals are given.

FIG. 10 is a diagram showing a flow of heating control by heating control unit 431, outlet temperature control unit 432, system identification unit 433 and control gain determination unit 434 in the present embodiment. As shown in FIG. 10, the system identification unit 433 uses the room temperature information acquired from the room temperature sensor 2 of the house 1, the outlet water temperature command from the heating control unit 431, and the return temperature information from the return temperature sensor 22. The thermal characteristic of 1 is calculated and output to the control gain determination unit 434. Specifically, the system identification unit 433 calculates the time constant τ _r and the proportional coefficient K _r of the thermal characteristics of the house 1 with the difference between the outlet temperature command and the return temperature as the operation amount u.

The control gain determination unit 434 is for the gain for the compressor ON and the compressor OFF in the heating control unit 431, based on the time constant τ _r and the proportional coefficient K _r of the thermal characteristics of the house 1 calculated by the system identification unit 433. The gain is calculated and output to the heating control unit 431 according to the gain selection signal. The heating control unit 431 generates a outlet temperature command from the control gain calculated by the control gain determining unit 434, the set temperature, and the room temperature information acquired from the room temperature sensor 2, and outputs the outlet temperature instruction to the outlet temperature control unit 432.

  FIG. 11 is a block diagram of the heating control unit 431 in the present embodiment. In the present embodiment, the output of the PI control calculation of equation (10) is the difference between the hot water outlet temperature command and the return temperature command. In order to convert this into the outlet temperature command, as shown in FIG. 11, a value obtained by adding the return temperature information from the temperature sensor 22 back to the output of the PI controller is set as the outlet temperature instruction before the limiter.

  As described above, according to the present embodiment, heating control unit 431 in system identification unit 433 inputs the outlet temperature command and the return temperature generated using the set temperature, the room temperature information, and the initial control gain. By using the room temperature information of the house 1 as a variable and using the room temperature information of the house 1 as an output variable, it is possible to calculate the thermal characteristics of the house 1 including the delay of the hot water temperature control system and the heat release status of the indoor heat exchanger 51, and the accuracy of system identification Improves the room temperature tracking of the heating control. As a result, the comfortability is improved, and the overshoot at room temperature is less likely to occur due to the improvement of the room temperature followability, so that the improvement of the energy saving property can also be realized.

Third Embodiment
Next, a third embodiment of the present invention will be described. In Embodiments 1 and 2 above, the thermal characteristics of House 1 are modeled as a single-input single-output system model as in Equation (1), while in the present embodiment the thermal characteristics of House 1 are converted into multiple-input single The second embodiment differs from the first and second embodiments in that it is a model of an output system. In the first and second embodiments, the control gain in the PI controller of the heating control unit 431 is selected according to the ON / OFF of the compressor 31. However, in the present embodiment, the compressor 31 is ON. In addition to ON / OFF, it differs in the point which also considers ON / OFF of circulation pump 36 which circulates warm water to indoor unit 5. The same components as in the first embodiment are given the same reference numerals as in the first embodiment.

  FIG. 12 is a thermal network model in the present embodiment. FIG. 12 (a) is a thermal network model to be controlled in the present embodiment, and FIG. 12 (b) is a thermal network model when there is a heat supply from the indoor unit 5, and FIG. c) is a thermal network model when there is no heat supply from the indoor unit 5; In Embodiments 1 and 2 described above, the thermal characteristics of the house 1 are set as a single-input single-output system model of Equation (1), and system identification is performed while the indoor unit 5 is supplying heat. And the control gain in PI control of the heating control part 431 is calculated by Formula (11)-Formula (14) using the result obtained by system identification. On the other hand, in the present embodiment, control gains (gain for air conditioning ON and gain for air conditioning OFF) in PI control are designed with the thermal network model shown in FIG. 12A as a control target.

In FIG. 12 (a) ~ FIG 12 (c), _{T o} is the outside air temperature, _{T z} at room _{temperature, Q idu} supply heat of the indoor unit _{5, R all} the thermal resistance of the house _{1 [K / kW], C} all Shows the heat capacity [kJ / K] of the house 1 respectively. Applying the theory of superposition, the thermal network model in the case where there is a heat supply from the indoor unit 5 shown in FIG. 12 (b), and the thermal network model in the case where there is no supply heat shown in FIG. 12 (c) The thermal network model of FIG. 12 (a) is expressed by the following equation (15) when the respective transfer functions from indoor unit supply heat to room temperature and from outside temperature to room temperature are added using

  FIG. 13 is a schematic configuration diagram of a hot water circulation circuit in the present embodiment. The warm water circulation circuit of the present embodiment is different from the warm water circulation circuit of the first embodiment shown in FIG. 2 in that the outside air temperature sensor 500 is provided. The other configuration of the hot water circulation circuit is the same as that of the first embodiment. In FIG. 13, although the heat source unit 3 is provided with the outside air temperature sensor 500, the present invention is not limited to this, as long as the control device 4 is provided with outside air temperature information. For example, as in the room temperature sensor 2, the outside air temperature sensor 500 may be separately provided and connected to the input / output unit 41 of the control device 4.

  FIG. 14 is a functional block diagram of control device 4 in the present embodiment. The present embodiment is different from the control device 4 of the first embodiment shown in FIG. 3 in that the outside air temperature information is stored in the storage unit 42. The other configuration of the control device 4 is the same as that of the first embodiment. The outside air temperature information is stored in the storage unit 42 from the heat source unit 3 through the input / output unit 41 of the control device 4 and is used for processing of the control unit 43. The outside air temperature information may be obtained not only from the outside air temperature sensor 500 but also as data obtained by converting weather forecast data into the control device 4.

  FIG. 15 is a diagram showing a flow of heating control by the heating control unit 431, the hot water outlet temperature control unit 432, the system identification unit 433 and the control gain determination unit 434 in the present embodiment. The present embodiment is different from the flow of the heating control of the first embodiment shown in FIG. 4 in that the outside air temperature information is supplied from the heat source unit 3 to the system identification unit 433. The other configuration in the flow of heating control is the same as that of the first embodiment. The outside air temperature information is used by the system identification unit 433 for system identification.

  FIG. 16 is an example of determination of the gain selection signal in the present embodiment. In the first and second embodiments, heating control unit 431 generates the gain selection signal based on ON / OFF of compressor 31. However, in the present embodiment, circulation pump 36 for circulating warm water to indoor unit 5 Also consider ON / OFF of. Specifically, as shown in FIG. 16, either the air conditioning ON gain or the air conditioning OFF gain is selected according to the ON / OFF of the circulation pump 36, that is, the presence or absence of heat supply by the indoor unit 5. In the example of FIG. 16, even when the compressor 31 is ON, if the circulation pump 36 is OFF, the air conditioning OFF gain is selected. Further, even if the compressor 31 is OFF, if the circulation pump 36 is ON, the air conditioning ON gain is selected. Note that the determination of the gain selection signal is not limited to the example of FIG. 16. For example, when the compressor 31 is ON and the circulation pump 36 is OFF, it usually takes only a short time. Therefore, the air conditioning ON gain may be selected. In the following description, the case where heat is supplied when the circulation pump 36 of the indoor unit 5 is ON is "air conditioning ON", and the case where the indoor unit 5 does not supply heat when the circulation pump 36 is off (natural heat radiation State) is referred to as "air conditioning off". Further, the air conditioning ON gain corresponds to the "first gain" of the present invention, and the air conditioning OFF gain corresponds to the "second gain" of the present invention.

Next, the calculation of the thermal characteristic of the house 1 by the system identification unit 433 of the present embodiment will be described. In the present embodiment, the system identification target is a model of equation (15), and system identification is performed by dividing the time of air conditioning ON and the time of air conditioning OFF. The equation (15) can be expressed by the following equation (16) using the proportional coefficient K _r of the thermal characteristics of the house 1 of the equation (1) and the time constant τ _r of the thermal characteristics of the house 1.

  When the air conditioning is turned on, system identification can be performed while suppressing the influence of changes in outside air temperature by performing system identification on a cloudy day in the daytime or at night. The system identification process at the time of air conditioning ON is the same as the contents described in the first embodiment.

When the air conditioning is turned off, Q _{idu in} the first term of the right side of the equation (16) becomes 0, so it is possible to obtain a transfer function (second term on the right side) from ambient temperature to room temperature. At this time, the initial value of the state variable of the transfer function in the second term of the right side is set to the room temperature immediately before the air conditioning is turned off. This initial value varies depending on the discretization method, but is a value proportional to room temperature.

  FIG. 17 is a flowchart showing a flow of system identification processing (when the air conditioning is turned off) in the present embodiment. In this process, first, the state variable x at the start of system identification and the operation amount u are acquired as initial data, and are stored in the storage unit 42 (S31). And heating control by heating control part 431 is performed using an initial control gain memorized by storage part 42 (S32). Here, in the case of the air conditioning OFF, in the heating control, the outlet water temperature command in the heating control unit 431 is updated, and the outlet water temperature instruction to the outlet water temperature control unit 432 is not updated.

Next, it is determined whether four points of data have been acquired (S33). Data referred to here is a state variable _{x n,} the integrated value _{u N_sum} manipulated variable u, and changes the sampling period _{T sn} used for calculating the thermal characteristics of the house 1. Then, if data of four points are not acquired (S33: NO), it is judged whether or not the room temperature is reduced by 0.5 ° C. or more from the room temperature stored last time (S34). This is because the room temperature drops when the air conditioning is turned off. Then, if the room temperature has not decreased by 0.5 ° C. or more from the room temperature stored previously (S34: NO), 1 is added to the sample count cnt (S35), and the operation amount u is integrated (S36). Then, the process returns to step S32, and the subsequent processes are repeated.

On the other hand, if the room temperature has decreased by 0.5 ° C. or more from the room temperature stored last time (S34: YES), the state variable x _n , the integrated value _{un_sum} of the operation amount u, and the change sampling period T _sn are stored (S37). The state variable x _n is the room temperature detected by the room temperature sensor 2, and the integrated value _{un_sum} of the operation amount u is the outside air temperature detected by the outside air temperature sensor 500. The change sampling period _Tsn is a value obtained by the above equation (8). Thereafter, the sample count cnt is reset (S38), and the process returns to step S32 to repeat the subsequent processing. Then, when data of four points different from the initial data at the start of system identification is acquired (S33: YES), based on the acquired data, the time constant τ _r of the thermal characteristic of the house 1 and the proportional coefficient K _r Is calculated (S39).

And the gain for air conditioning OFF which is a control gain of PI controller at the time of air conditioning OFF is calculated | required by Formula (17) and Formula (18). As in the first and second embodiments, the design time constant τ _c is the time constant τ _r of the thermal characteristics of the house 1.

FIG. 18 is a flow chart showing the flow of the heating control process in the present embodiment. In this process, first, the control gain determination unit 434 uses the time constant τ _r of the thermal characteristics of the house 1 obtained by the system identification unit 433 and the proportional coefficient K _r of the thermal characteristics of the house 1 to turn on air conditioning. The gain for the air conditioning and the gain for the air conditioning OFF are separately calculated when the air conditioning is ON and when the air conditioning is OFF (S41). Then, a gain selection signal is acquired from the heating control unit 431 (S42), and it is determined whether to select the air conditioning ON gain based on the acquired gain selection signal (S43). The heating control unit 431 generates a gain selection signal in consideration of ON / OFF of the circulation pump 36 as well as ON / OFF of the compressor 31.

  Here, when the air conditioning ON gain is selected (S43: YES), the air conditioning ON gain is output to the heating control unit 431. Then, the heating control unit 431 performs heating control calculation using the air conditioning ON gain, and the hot water outlet temperature command is updated (S44). Thereafter, the updated outlet temperature command is output to the outlet temperature control unit 432 (S45). When the air conditioning ON gain is not selected (S43: NO), that is, when the air conditioning OFF gain is selected, the air conditioning OFF gain is output to the heating control unit 431. Then, the heating control unit 431 performs a heating control calculation using the air conditioning OFF gain, and the outlet hot water temperature command is updated (S46). In this case, since the air conditioning is turned off, the output of the outlet temperature command to the outlet temperature control unit 432 is not performed, and only the outlet temperature instruction in the heating control unit 431 is updated. Then, according to the room temperature information and the like, the heating control unit 431 outputs a gain selection signal to the control gain determination unit 434, and the processing from step S42 to step S46 is repeated.

  As described above, according to the present embodiment, in addition to the operating condition on the heat source side flow passage 30 side of the heat source unit 3, the operating condition on the use side flow passage 50 side is also reflected. You can do it. Moreover, the control gain design of the PI controller is closer to the actual use environment by performing system identification when the air conditioning is ON and when the air conditioning is OFF, using the model in consideration of the influence of the outside air temperature expressed by equation (16). Calculated in the state. As a result, the outlet temperature command at the time of resuming the air conditioning is properly set, and the room temperature controllability is improved to be comfortable.

  Further, FIG. 19 shows heating control by heating control unit 431, hot water outlet temperature control unit 432, system identification unit 433 and control gain determination unit 434 in the case where return temperature information is used as in the second embodiment in the present embodiment. Is a diagram showing the flow of In the present embodiment, outside air temperature information is added to the second embodiment, and the outside air temperature information is used by the system identification unit 433 as shown in FIG.

Fourth Embodiment
Next, the fourth embodiment of the present invention will be described. The present embodiment is different from the third embodiment in that the thermal characteristics of the house 1 are different models for air conditioning ON and air conditioning OFF. The other configurations of the hot water heating system 100 and the respective devices are the same as those of the third embodiment, and the same reference numerals are given.

  The calculation of the thermal characteristic of the house 1 by the system identification unit 433 of the present embodiment will be described. The target of system identification is set as Formula (19), and system identification is performed separately at the time of air conditioning ON and OFF similarly to Embodiment 3 also in this embodiment. In the present embodiment, assuming that the time constant of the system is different between when the air conditioning is on and when the air conditioning is off, a model is used that assumes that the room temperature does not converge to the outside air temperature when the air conditioning is off. The reason why the room temperature does not converge to the outside air temperature when the air conditioning is off is that there is heat such as household appliances and certificates in the house 1 and the influence of solar radiation. In addition, furniture, walls, floors, ceilings, etc. are stored by air conditioning, solar radiation, etc., and heat exchange may occur with indoor air when the room temperature starts to fall after the air conditioning is turned off. In this embodiment, in order to consider these with an inexpensive microcomputer, in equation (19), it is assumed that the heat supply by air conditioning is proportional to the outside air temperature, and the gain for air conditioning OFF and the gain for air conditioning ON of PI controller As a model for the design of

Here, K _{r —} OFF is a proportional coefficient of thermal characteristics of the house 1 at the time of air conditioning OFF, and τ _{r —} OFF is a time constant of thermal characteristics of the house 1 at the air conditioning OFF. The PI control gain at the time of air conditioning ON in the case of system identification using the model of equation (19) can be obtained using equations (11) and (12) of the first embodiment. In addition, PI control gain at the time of air conditioning OFF, using proportional coefficient _{Kr_OFF} of thermal characteristics of house 1 at the time of air conditioning OFF, time constant τ _{r_OFF,} and control design time constant τ _{c_OFF} at the time of air conditioning OFF, the following formula It is calculated by (20) and equation (21).

  As described above, according to the present embodiment, even when the room temperature does not converge to the outside air temperature when the air conditioning is off, it is possible to set the control gain according to the actual environment, and the hot water temperature when the air conditioning is resumed Setting the command appropriately, room temperature control is improved and it becomes comfortable.

  The above is the description of the embodiment of the present invention, but the present invention is not limited to the configuration of the above embodiment, and various modifications or combinations are possible within the scope of the technical idea thereof. . For example, the hot water heating system 100 may have not only a heating function but also other functions such as a cooling function. Further, the hot water heating system 100 of the present invention can be applied not only to the house 1 but also to various buildings such as buildings. Moreover, the measuring point of room temperature is not limited to one place, You may control the whole building by making the average value or the lowest value of several measuring points into a measuring point.

Furthermore, the system identification unit 433 is the room temperature information acquired from the room temperature sensor 2 of the house 1, the outlet water temperature command from the heating control unit 431, the return temperature information from the return temperature sensor 22, and the flow rate detected by the flow rate sensor 23. And the thermal characteristic of the house 1 may be calculated. Specifically, the heat supply equivalent value obtained by multiplying the flow rate by the return temperature difference obtained by subtracting the return temperature information from the outlet water temperature information is taken as the operation amount u of equation (5) or equation (5) when the thermal characteristics of house 1 The constant τ _r and the proportional coefficient K _r are calculated. Also in this case, the accuracy of system identification is improved, and the room temperature tracking ability of heating control is improved.

  1 House, 2 Room Temperature Sensor, 3 Heat Source Machine, 4 Controller, 5 Indoor Unit, 21 Outgoing Water Temperature Sensor, 22 Return Temperature Sensor, 23 Flow Sensor, 30 Heat Source Side Channel, 31 Compressor, 32 Outdoor Heat Exchanger, 33 Fan, 34 refrigerant flow rate adjustment device, 35 water heat exchanger, 36 circulation pump, 37 heat source unit control unit, 41 input / output unit, 42 storage unit, 43 control unit, 50 utilization side flow passage, 51 indoor heat exchanger, 100 Hot water heating system, 411 digital input unit, 412 AD conversion unit, 413 serial communication unit, 414 display unit, 431 heating control unit, 432 outlet hot water control unit, 433 system identification unit, 434 control gain determination unit, 435 mode determination unit, 436 Output data processing unit, 500 outdoor temperature sensor.

Claims (11)

A room temperature sensor that detects room temperature information of the building;
A heat source machine that produces hot water,
An indoor unit that releases heat of hot water generated by the heat source unit to heat the building;
A controller for controlling the heat source unit;
Equipped with
The heat source unit is
A compressor for compressing a refrigerant,
A refrigerant-water heat exchanger that exchanges heat between the refrigerant and water;
And a circulation pump for circulating the hot water between the refrigerant-water heat exchanger and the indoor unit,
The controller is
A control gain determination unit that calculates a first gain and a second gain based on the thermal characteristic of the building;
A heating control unit that updates a hot water outlet temperature command, which is a target value of the outlet temperature of the refrigerant-water heat exchanger, using the first gain and the second gain;
An outlet hot water temperature control unit which issues a heat supply command to the heat source unit based on the outlet hot water temperature command updated by the heating control unit when the air conditioning is ON in which the indoor unit supplies heat to the building;
Have
The first gain is designed to obtain the outlet temperature command so as to obtain a desired room temperature response when the air conditioning is ON,
The second gain is designed to obtain the outlet temperature command reflecting the room temperature change in the case of the air conditioning OFF in which the indoor unit does not supply heat to the building.
The heating control unit updates the outlet hot water temperature command using the set temperature of room temperature, the room temperature information, and the first gain in the case of the air conditioning ON, and in the case of the air conditioning OFF, the set temperature and the air The hot water heating system which updates the said hot water outlet temperature instruction | command using room temperature information and the said 2nd gain. The control device further includes a system identification unit that calculates a thermal characteristic of the building,
The system identification unit calculates a proportional coefficient and a time constant of thermal characteristics of the building,
The hot water heating system according to claim 1, wherein the control gain determination unit calculates the second gain using a time constant of thermal characteristics of the building as a design time constant of the heating control unit.   The said control gain determination part calculates | requires the design time constant in the said heating control part from dead time according to the total amount and flow volume of warm water produced | generated by the said heat source machine, and calculates said 1st gain. Hot water heating system. It is further equipped with an outside air temperature sensor that detects the outside air temperature,
The system identification unit performs system identification separately for the air conditioning ON and the air conditioning OFF, and calculates the thermal characteristics of the building using at least the room temperature information for system identification for the air conditioning ON. 4. The hot water heating system according to claim 2, wherein a heat characteristic of the building is calculated using the outside air temperature detected by the outside air temperature sensor in the system identification in the case of the air conditioning OFF.   The system identification unit uses the hot water temperature command generated by the heating control unit using the set temperature of the room temperature, the room temperature information, and the initial control gain set in advance as an input variable, and outputs the room temperature information. The hot water heating system according to any one of claims 2 to 4, wherein the thermal characteristic of the building is calculated as a variable. The heat source unit further includes a return temperature sensor that detects a return temperature of water passing through the indoor unit and returning to the refrigerant-water heat exchanger.
The system identification unit uses the outlet temperature command and the return temperature, which are generated by the heating control unit using the set temperature of the room temperature, the room temperature information, and the initial control gain set in advance, as input variables. The hot water heating system according to any one of claims 2 to 4, wherein the thermal characteristic of the building is calculated using room temperature information as an output variable.   The hot water heating system according to any one of claims 2 to 6, wherein the system identification unit calculates the thermal characteristic of the building based on a plurality of time series data having different sampling cycles.   The hot water heating system according to any one of claims 1 to 7, wherein the room temperature information includes a room temperature and an elapsed time.   The hot water heating system according to any one of claims 1 to 8, wherein the heating control unit sets upper and lower limit values to the outlet water temperature command and has an anti-reset windup processing function. A control device of a hot water heating system , comprising: a heat source unit generating hot water; and an indoor unit discharging heat of the hot water generated by the heat source unit to heat a building ,
Based on the thermal characteristics of the building is a heating target, and a control gain determining unit for calculating a first gain and a second gain,
A heating control unit that updates a hot water outlet temperature command, which is a target value of the outlet temperature of water of the refrigerant-water heat exchanger provided in the heat source unit , using the first gain and the second gain;
An outlet hot water temperature control unit which issues a heat supply command to the heat source unit based on the outlet hot water temperature command updated by the heating control unit when the air conditioning is ON in which the indoor unit supplies heat to the building;
Have
The first gain is designed to obtain the outlet temperature command so as to obtain a desired room temperature response when the air conditioning is ON,
The second gain is designed to obtain the outlet temperature command reflecting the room temperature change in the case of the air conditioning OFF in which the indoor unit does not supply heat to the building.
The heating control unit updates the outlet temperature command using the set temperature of room temperature, the room temperature information of the building, and the first gain in the case of the air conditioning ON, and in the case of the air conditioning OFF, the set temperature The controller for updating the outlet temperature command by using the room temperature information and the second gain. A control method of a hot water heating system , comprising: a heat source machine generating hot water; and an indoor unit discharging heat of the hot water generated by the heat source machine to heat a building ,
Based on the thermal characteristics of the building is a heating target, calculating a first gain and a second gain,
Updating the outlet temperature command, which is a target value of the outlet temperature of water of the refrigerant-water heat exchanger provided in the heat source unit , using the first gain and the second gain;
Performing a heat supply command to the heat source unit based on the updated hot water outlet temperature command when the air conditioning is ON in which the indoor unit supplies heat to the building;
Including
The first gain is designed to obtain the outlet temperature command so as to obtain a desired room temperature response when the air conditioning is ON,
The second gain is designed to obtain the outlet temperature command reflecting the room temperature change in the case of the air conditioning OFF in which the indoor unit does not supply heat to the building.
In the step of updating the outlet temperature command, when the air conditioning is ON, the outlet temperature instruction is updated using the set temperature of room temperature, the room temperature information of the building, and the first gain, and when the air conditioning is OFF, And a control method including updating the outlet temperature command using the set temperature, the room temperature information, and the second gain.

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