JP2004085112A - Heating system - Google Patents

Abstract

An object of the present invention is to provide a floor heating device improved so that the temperature of supplied hot water rises smoothly and thermal efficiency can be improved.
A floor heating device includes a heat source unit and a floor heating radiator receiving hot water supplied from the heat source unit. The heat source unit 3, the radiator 5, the outgoing pipe 31 and the return pipe 33 are connected. The outgoing pipe 31 is opened and closed by an on-off valve 29. When the control unit 50 of the heat source unit 3 starts sending hot water to the radiator 5, (1) issues an open command to the on-off valve 29, and (2) thereafter, before the on-off valve 29 actually starts to open, the pump 9 operates. (3) After the pump 9 is started, a combustion start command for the heat source unit 3 is issued at a timing when the supply hot water temperature does not rise to an allowable value before the on-off valve 29 is opened. To control. As a result, the hot water temperature does not become equal to or higher than the threshold value, and a smooth start of the heating operation can be realized.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heating device such as a hot-water floor heating device, and more particularly to a heating device improved so that the temperature of supplied hot water rises smoothly and thermal efficiency can be improved.
[0002]
[Prior art]
FIG. 4 is a diagram schematically illustrating an example of a configuration of a conventional floor heating device.
The floor heating device 101 includes a heat source unit 103 and a floor heating room radiator 105 connected to the heat source unit 103 by hot water circulation pipes 131 and 133. The heat source unit 103 has a control unit 150, and performs operations of each unit in the unit according to an operation table provided in the unit. The heat source unit 103 includes a heating expansion tank 107, a pump 109, a heat exchanger 111, a burner 113, a fan 115, and the like. The hot water in the hot water circulation pipe is circulated by a pump 109 provided in the pipe. A pipe upstream of the pump is a return pipe 118, and a pipe downstream of the pump is an outgoing pipe 119.
[0003]
The outgoing pipe 119 branches off downstream of the pump 109. One pipe is a high-temperature pipe 121 passing through the heat exchanger 111, and the other pipe is a low-temperature pipe 123 not passing through the heat exchanger 111. In the burner 113, a combustion gas is supplied from a gas supply pipe 125, and combustion air is sent from a fan 115 to burn and generate a combustion gas. The generated combustion gas is sent to the heat exchanger 111, where heat exchange is performed between the combustion gas and water in the piping.
[0004]
A temperature sensor 141 is provided in the high-temperature pipe 121 on the outlet side of the heat exchanger 111. The output of the temperature sensor 141 is sent to the controller 150, and the gas combustion amount is controlled by operating the gas proportional valve 127 provided in the gas supply pipe 125 so that the detected temperature becomes, for example, about 80 ° C. I do. High-temperature water is sent directly from the high-temperature pipe 121 to various types of heating devices and bath additional heating heat exchangers (not shown). In addition, high-temperature water is also sent from the high-temperature pipe 121 to the tank 107 through the bypass pipe 139 to supply heat for heating the hot water (low-temperature water) in the tank 107.
[0005]
The low-temperature pipe 123 is connected to the indoor radiator outgoing pipe 131 via an on-off valve 129. The indoor radiator outgoing pipe 131 is connected to the indoor radiator 105. A meandering hot water flow path is formed in the indoor radiator 105, and heat of the hot water passing through this flow path is released to heat the room. The indoor radiator return pipe 133 that has exited the indoor radiator 105 is connected to the return pipe 117. The high-temperature pipe 121 is connected to a terminal using high-temperature (80 ° C.) hot water such as a bathroom heater 136 via an on-off valve 135. The pipe exiting the bathroom heater 136 is also connected to the return pipe 117.
A heating expansion tank 107 is provided at the end of the return pipe 117. The returned warm water is temporarily stored in the expansion tank 107.
[0006]
A bypass pipe 139 having a bypass valve 137 is connected between the high-temperature going pipe 121 and the return pipe 117. High-temperature water heated by the heat exchanger 111 is directly sent to the tank 107 through the bypass pipe 139 to compensate for a decrease in the temperature of the hot water in the tank.
The low-temperature pipe 123 is connected to the indoor radiator outgoing pipe 131, and hot water that has released heat via the indoor radiator 105 is returned to the tank 107 through return pipes 133 and 117. During the low-temperature operation, as described above, the high-temperature hot water from the heat exchanger 111 and the low-temperature hot water returning from the indoor radiator 105 are mixed in the tank to an appropriate temperature, and the low-temperature piping 123 It is supplied to the low temperature pipe 131 going to the indoor radiator. At this time, the temperature of the hot water is detected by the temperature sensor 143 provided in the low-temperature pipe 123, and the output is sent to the control unit 150. The control unit 150 controls the gas combustion amount by operating the gas proportional valve 127 and the bypass valve 137 so that the temperature becomes approximately 60 ° C.
[0007]
A bypass pipe 140 different from the above-described bypass pipe 139 is also connected between the high-temperature going pipe 121 and the return pipe 117. The pressure loss of the bypass pipe is reduced by using two bypass pipes. Further, the bypass pipe 140 is not provided with a valve and is always open.
[0008]
The operation table of the control unit 150 usually includes a unit control cycle time (for example, 20 minutes), a hot water supply temperature (for example, 60 ° C. or 80 ° C.), and a temperature depending on the type of the building on which the floor heating device is laid. The opening / closing time of the on-off valve 129 (for example, 3 to 20 minutes) in the control cycle corresponding to the difference between the set temperature of the user and the room temperature, and the temperature that is a threshold value for determining the on / off operation of the heat source unit 103 (for example, Is set at ± 10 ° C.). Then, based on this operation table, the control unit 150 instructs each unit to open and close the on-off valve 129, burn the burner 113, and the like.
[0009]
An example of an operation flow of each unit according to the operation table of the floor heating device will be described.
The control unit supplies hot water from the heat source device 103 to the indoor radiator 105 within a fixed unit control cycle time (20 minutes) according to the difference between the user's set temperature and the indoor temperature (3 to 3 minutes). 20 minutes). That is, when the temperature difference is large, the hot water supply time is increased within the control cycle time, and when the temperature difference is small, the same time is reduced. Note that the time for supplying hot water refers to the time during which the on-off valve 129 reaching the indoor radiator outgoing pipe 131 is opened.
[0010]
When the use of the floor heating device is started, in the conventional normal control, an open command is issued to the on-off valve 129 of the indoor radiator going pipe 131, the pump 109 starts operating, and at the same time, the burner 113 starts burning. I do. Then, when the predetermined hot water supply time ends within the unit control cycle time, the on-off valve 129 closes and the combustion of the burner 113 stops. Note that the pump 109 stops with a slight delay from this end time.
[0011]
[Problems to be solved by the invention]
In this floor heating device, a thermal valve is generally used as the on-off valve 129 provided in the indoor radiator outgoing pipe 131. This is because the thermal valve is small and inexpensive, and does not generate noise during operation. However, this thermal valve has poor responsiveness, and when a valve opening command is received, the valve starts to open after a certain time (several tens of seconds), and thereafter the opening degree (valve opening rate) gradually increases. Therefore, it takes one minute or more from when the opening command is received to when the valve is completely opened.
[0012]
As described above, in the conventional normal control, the pump 109 and the burner 113 are activated at the same time when the open command is issued to the on-off valve 129. However, at this time, since the opening rate of the on-off valve 129 is still low, the amount of water flowing through the water pipe of the heat exchanger 111 is small (only the amount flowing through the bypass pipe 140 without a valve), and the outlet side of the heat exchanger 111 The temperature of the hot water rises sharply. For this reason, the temperature of the hot water in the high-temperature pipe 121 detected by the temperature sensor 141 exceeds the temperature that becomes the burner stop threshold value in a relatively short time (see FIG. 3F, which will be described in detail later). The burner stop threshold is, for example, a case where the difference between the temperature detected by the temperature sensor and a predetermined temperature (for example, 80 ° C.) becomes + 10 ° C. When the temperature exceeds the threshold temperature, the combustion mechanisms such as the burner 113 and the fan 115 stop, and the temperature of the hot water in the pipe rapidly decreases.
[0013]
Then, when the temperature decreases to the lower threshold (for example, 80 ° C.−10 ° C. = 70 ° C.), the combustion mechanism resumes operation, and the hot water temperature rises again.
[0014]
Due to such a change in the temperature of the hot water, the combustion mechanism performs twice ON / OFF operation at the beginning of the unit control cycle, and energy loss of the combustion engine occurs. Further, the temperature of the hot water at the time when the open / close valve (thermal valve 129) is actually opened and the hot water starts to be sent to the heating radiator 105 is unstable, and the rise of the supply hot water temperature lacks smoothness.
[0015]
The present invention has been made in view of such a problem, and an object of the present invention is to provide a floor heating device improved so that the temperature of supplied hot water rises smoothly and thermal efficiency can be improved.
[0016]
[Means for Solving the Problems]
In order to solve the above problems, a floor heating device of the present invention includes: a heat source device that supplies hot water; a radiator such as floor heating that receives hot water supply from the heat source device; and hot water between the heat source device and the radiator. A hot water pipe that circulates the hot water pipe, a thermal valve that opens and closes the hot water pipe, a bypass pipe that bypasses the radiator and connects an outlet side and an inlet side of the heat source device, and a pump that flows hot water in the pipe. A heating device comprising: a temperature sensor that detects a temperature of hot water on the exit side of the heat source device; and a control unit that receives a signal from the temperature sensor and controls the heat source device, a heat valve, and a pump. A heating device, wherein the control unit issues a command to each unit in the following sequence when starting to send hot water to the radiator;
(1) An open command is issued to the thermal valve.
(2) After that, before the thermal valve actually starts to open, the start command of the pump is issued.
{Circle around (3)} After the pump is started, a command to start combustion of the heat source unit is issued at a timing when the temperature detected by the temperature sensor does not rise to an allowable value before the thermal valve opens.
[0017]
When the pump and the combustion mechanism are started together with the opening command of the on-off valve using the thermal valve as in the conventional control, the valve opening rate of the valve is still low and the amount of water flowing through the water pipe of the heat exchanger is reduced. The temperature of the hot water on the outlet side of the heat exchanger rises sharply. Therefore, after the opening command of the on-off valve, a start command of the pump is issued before the thermal valve actually starts to open, and after the pump is activated, the combustion mechanism of the heat source unit is activated until the thermal valve opens. Thereby, the on-off valve is completely opened before the temperature of the hot water in the pipe reaches the threshold, and the flow rate of water in the heat exchanger becomes a sufficient amount, so that the temperature of the hot water does not exceed the threshold. . Therefore, at the start of the unit control cycle time, the combustion mechanism does not perform the on / off operation. Further, the temperature of the supply hot water does not fluctuate due to the ON / OFF of the heat exchanger, so that a smooth start of the heating operation can be realized.
[0018]
In the present invention, the average temperature of the water in the heat source unit at the time of (1) is Tp, the allowable value of the temperature detected by the temperature sensor is Tq, the amount of water retained in the heat source unit is Wr, When the average combustion output is Os, the time from the issuance of the thermal valve opening command to the start of combustion is tu, and the time from when the thermal valve actually starts to open after the opening command is tw,
tw>tu> tw− (Tq−Tp) × Wr ÷ Os
If the above tu is selected such that と, the time for issuing the combustion start command of the heat source device can be quantitatively obtained.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, description will be made with reference to the drawings.
FIG. 1 is a diagram schematically illustrating a configuration of a floor heating device according to an embodiment of the present invention.
The floor heating device 1 according to the present embodiment has a heat source unit 3 and a floor heating room connected to the heat source unit 3 by hot water circulation pipes 31, 33, similarly to the configuration of the conventional floor heating device shown in the figure. And a radiator 5. The heat source unit 3 has a control unit 50, which controls the operation of each unit in the unit. Details of the control unit 50 will be described later. The heat source unit 3 includes a heating expansion tank 7, a pump 9, a heat exchanger 11, a burner 13, a fan 15, and the like. The hot water in the hot water circulation pipe is circulated by a pump 9 provided in the same pipe. A pipe upstream of the pump is a return pipe 18, and a pipe downstream of the pump is an outgoing pipe 19.
[0020]
The outgoing pipe 19 branches off downstream of the pump 9, and one pipe is a high-temperature pipe 21 passing through the heat exchanger 11, and the other pipe is a low-temperature pipe 23 not passing through the heat exchanger. In the burner 13, combustion gas is supplied from a gas supply pipe 25, and combustion air is sent from a fan 15 to burn and generate combustion gas. The generated combustion gas is sent to the heat exchanger 11, and heat exchange is performed between the combustion gas and water in the piping. The amount of gas supplied from the gas supply pipe 25 to the burner 13 is controlled by a gas proportional valve 27.
[0021]
A temperature sensor 41 is provided in the high-temperature pipe 21 on the outlet side of the heat exchanger. The output of the temperature sensor 41 is sent to the control unit 50, and the gas proportional amount 27 provided in the gas supply pipe 25 is operated to control the gas combustion amount so that the detected temperature becomes, for example, about 80 ° C. . High-temperature water is directly sent from the high-temperature pipe 21 to various types of heating devices and bath additional heating heat exchangers (not shown). High-temperature water is also sent from the high-temperature pipe 21 to the tank 7 through the bypass pipe 39 to supply heat for heating the hot water (low-temperature water) in the tank 7.
[0022]
The low-temperature pipe 23 is connected to an indoor radiator going pipe 31 via an on-off valve 29. A thermal valve is used for the on-off valve 29. The indoor radiator outgoing pipe 31 is connected to the indoor radiator 5. A meandering hot water flow path is formed in the indoor radiator 5, and heat is released between the hot water passing through the flow path to heat the room. The indoor radiator return pipe 33 that has exited the indoor radiator 5 is connected to the return pipe 17. The high-temperature pipe 21 is connected to a terminal using high-temperature (80 ° C.) hot water such as a bathroom heater 36 via an on-off valve 35. The pipe exiting the bathroom heater 36 is also connected to the return pipe 17.
The heating expansion tank 7 is provided at the end of the return pipe 17. The returned warm water is temporarily stored in the expansion tank 7.
[0023]
A bypass pipe 39 provided with a bypass valve 37 is connected between the high temperature going pipe 21 and the return pipe 17 that have passed through the heat exchanger 11. A thermal valve is used as the bypass valve 37. High-temperature water heated by the heat exchanger 11 is directly sent to the tank 7 through the bypass pipe 39 to compensate for a decrease in the temperature of the hot water in the tank.
The low-temperature pipe 23 is connected to the indoor radiator outgoing pipe 31, and hot water that has released heat via the indoor radiator 5 is returned to the tank 7 through the indoor radiator return pipe 33 and the return pipe 17. Then, at the time of low-temperature operation, as described above, the high-temperature hot water from the heat exchanger 11 and the low-temperature hot water returning from the indoor radiator 5 are mixed in the tank to have an appropriate temperature, and It is supplied to the low temperature pipe 31. At this time, the temperature of the hot water is detected by a temperature sensor 43 provided in the low-temperature pipe 23, and the output is sent to the control unit 50. The control unit 50 controls the gas combustion amount by operating the gas proportional valve 27 and the bypass valve 37 such that the temperature becomes approximately 60 ° C.
[0024]
A bypass pipe 40 different from the bypass pipe 39 described above is also connected between the high-temperature going pipe 21 and the return pipe 17. The pressure loss of the bypass pipe is reduced by using two bypass pipes. The bypass pipe 40 is not provided with a valve and is always open.
[0025]
FIG. 2 is a block diagram of a control unit provided in the heat source unit of the floor heating device of FIG.
FIG. 3 is an example of a time chart of the control unit.
The control unit 50 includes an operation table 51 in which a supply hot water temperature, a unit control cycle time, a hot water supply time, a pump operation start and stop time, a combustion start and stop time, and a temperature serving as a threshold for determining the on / off operation of the heat source unit are set. And a driver 53 for operating the combustion mechanism (burner 13, fan 15, etc.), the pump 9, the on-off valve 29 leading to the indoor radiator outgoing pipe, and the like. The operation table 51 includes a microcomputer, a memory, a timer, and the like, and receives signals from a room temperature sensor (not shown in FIG. 1) and the like. Then, a predetermined operation flow is read from the operation table 51 based on these temperatures, and each part is operated by the driver 53. A time chart (details will be described later) shown in FIG. 3 is created based on this table.
The control unit 50 also controls the gas proportional valve 27, the bypass valve 37, and the like, and adjusts the temperature of the hot water in the high-temperature pipe 21 and the temperature of the hot water in the low-temperature pipe 23 as in the above-described conventional example. .
[0026]
Next, a time chart of the control unit will be described with reference to FIG.
As described above, the floor heating device supplies hot water from the heat source unit 3 to the indoor radiator 5 according to the difference between the user's set temperature and the actual room temperature within a certain unit control cycle time (b). Time (a) is set. Here, the unit control cycle time b and the hot water supply time a are predetermined times. The hot water supply time a indicates the opening time of the on-off valve 29 that reaches the indoor radiator outgoing pipe 31.
[0027]
As shown in FIG. 3A, at the start of the unit control cycle time (t = 0), the control unit issues an open command to the on-off valve 29 (see FIG. 1). When a predetermined hot water supply time (a) has elapsed, the control unit issues a close command to the on-off valve 29. Here, when a thermal valve is used as the on-off valve 29, the thermal valve has a certain responsiveness as shown in FIG. That is, when the opening / closing valve 29 receives the opening command at t = 0, the valve starts to open after a certain time (several tens of seconds, t = c), and thereafter the opening degree (valve opening rate) gradually increases. Then, it takes one minute or more to completely open (t = d). Then, when a close command is received at t = a, the valve starts closing slightly (t = e) and gradually closes (t = f).
[0028]
Therefore, the control unit issues a command to the pump 9 to open the on-off valve 29, as shown in FIG. 3C, and before the valve-opening rate of the on-off valve 29 rises (t = c) (t = c). = G). The effect of this timing on the hot water temperature will be described later.
An operation stop command is given after a predetermined time delay (t = h) after the command to close the on-off valve 29 is issued. As shown in FIG. 3B, immediately after the close command of the on-off valve 29, the valve 29 is still open, so that hot water can be circulated in the pipe. Therefore, even if the pump 9 is stopped after a delay from the closing command of the valve 29, the warm water heated to an appropriate temperature can be supplied to the indoor radiator 5, so that the heat can be used effectively.
The chart shown by the broken line in FIG. 3 (C) is an operation chart of the pump in the conventional floor heating device. The operation starts with the opening command of the on-off valve, and the operation is stopped slightly after the closing command. .
[0029]
In addition, as shown in FIG. 3D, the control unit issues a command to start the pump 9 to the combustion mechanism (burner 13, fan 15, or the like) of the heat source device (t = g). Then, a combustion start command is issued at an appropriate timing (t = i) until the opening / closing valve 29 starts to open (t = c). The effect of this timing on the hot water temperature will be described later.
Then, a combustion stop command is issued at a point in time (t = j) after the issuance of the command to close the on-off valve 29. The time j is before the time when the opening rate of the on-off valve 29 becomes 0 (t = f) or the time when the pump stops (t = h). As shown in FIG. 3 (B), immediately after the close command of the on-off valve 29, the valve is still open, and as shown in FIG. 3 (C), the pump 9 is also operating. Hot water can be circulated. Immediately after the combustion of the heat source unit is stopped, the heat exchanger 11 is still in a sufficiently heated state. Therefore, it is possible to supply hot water whose temperature has not decreased.
The chart shown by the broken line in FIG. 3 (D) is an operation chart of the combustion mechanism in the conventional floor heating device. The operation is started at the same time as the opening command of the on-off valve, and is stopped at the same time as the closing command. . When compared with the operation chart of the combustion mechanism of this conventional floor heating device, it can be seen that the combustion time is short in the floor heating device of the present embodiment.
[0030]
The bypass valve 37 also opens and closes at the same timing as the on-off valve 29 in the case of low-temperature water supply. The valve opening rate of the bypass valve 37 is shown in FIG.
[0031]
As described above, the temperature of the hot water supplied to the indoor radiator 5 by the operation of the on-off valve 29, the bypass valve 37, the pump 9, the combustion mechanism (the burner 13, the fan 15, etc.) is as shown in FIG. It has a temperature curve as shown by the solid line. In the figure, the vertical axis represents temperature, and the horizontal axis represents time. The solid line is the temperature curve obtained by the operation flow of the present invention, and the dotted line is the temperature curve obtained by the operation flow in the conventional heating device shown in FIG.
[0032]
In the temperature curve according to the conventional operation flow indicated by the dotted line, the temperature of the hot water in the pipe rapidly rises when an open command is issued to the on-off valve 129 (see FIG. 4). This is because the opening rate of the on-off valve 129 is still low immediately after the opening command, and the amount of water flowing in the water pipe of the heat exchanger 111 is small, so that the amount of heating heat is excessive compared to the amount of water. It is. Then, the temperature exceeds the temperature at which the burner stop threshold value T2 is reached in a relatively short time. The burner stop threshold T2 is, for example, a case where the difference between the temperature detected by the temperature sensor 141 provided in the high-temperature pipe 121 and a predetermined temperature (for example, 80 ° C) is + 10 ° C (90 ° C). . When the temperature exceeds the threshold temperature, the combustion mechanisms such as the burner 113 and the fan 115 stop, and the temperature of the hot water drops rapidly. Then, when the temperature decreases to the lower limit threshold T1 (for example, 80 ° C.−10 ° C. = 70 ° C.), the combustion mechanism restarts the operation, and the temperature of the hot water in the pipe increases. After the restart of the operation, the temperature once peaks below the burner stop threshold T2, and then gradually decreases and is kept almost constant. Then, when the operation of the heat source device is stopped, the heat source device rapidly decreases, and thereafter gradually decreases within the unit control cycle time (b).
[0033]
On the other hand, in the operation flow of the present invention, as described above, the pump 9 starts before the on-off valve 29 actually starts to open, and the combustion mechanism such as the burner 13 and the fan 15 starts the on-off valve after the pump 9 starts. 29 starts at an appropriate timing before it starts to open. Thus, the valve 29 is completely opened before the temperature of the hot water in the pipe reaches the burner stop threshold value T2. As a result, the flow rate of water in the heat exchanger becomes a sufficient amount, so that the temperature of the hot water does not exceed the threshold value T2 as shown by the solid line in the figure. Then, the temperature once peaks below the burner stop threshold value T2, and thereafter gradually decreases and is kept almost constant.
[0034]
With such a temperature curve, the heat exchanger does not perform on / off operation at the start of the unit control cycle time. Further, since there is no change in the temperature of the supply hot water caused by turning on and off the heat exchanger, a smooth start of the heating operation can be realized.
[0035]
Here, the combustion start time tu (t = i in FIG. 3) of the combustion mechanism such as a burner can be obtained by the following method.
Average temperature of water in the heat source device when an open command is issued to the on-off valve 29 (for example, average of temperatures detected by the temperature sensor 43);
The upper limit temperature threshold (allowable value) of the temperature detected by the temperature sensor 43;
Water volume in the heat source unit; Wr,
Average combustion output at the start of combustion of the heat source unit; Os,
The time from when the opening / closing valve 29 actually starts to open after the opening command; tw,
And when
The combustion start time tu (combustion start preceding time, t = i in FIG. 3) of the combustion mechanism from the point in time when the opening command of the on-off valve 29 is issued,
tw>tu> tw− (Tq−Tp) × Wr ÷ Os
Select so that In addition, the flow rate in the bypass pipe 40 is set to 0 from the viewpoint of safety as to the amount of water held by the heat source unit.
[0036]
For example, the average (Tp) of the temperature detected by the temperature sensor 43 when the open command is issued to the on-off valve 29 is 45 ° C., the upper limit temperature threshold (Tq) of the temperature detected by the temperature sensor 43 is 90 ° C., The amount of water (Wr) held in the heat source unit is 1.5 liters, the average combustion output (Os) at the start of combustion of the heat source unit is 10,000 kcal / h, and the time (tw) until the on-off valve 29 actually starts to open after the opening command is issued. 60s.
In this case, tw− (Tq−Tp) × Wr ÷ Os becomes
60- (90-45) × 1.5 × 60 × 60/100000
= 60-24.3
= 35.7.
[0037]
At this time, the combustion start time tu of the combustion mechanism from the time when the opening command of the on-off valve 29 is issued is selected so as to fall within the range of 60>tu> 35.7. That is, the combustion mechanism may be operated about 36 seconds after the command to open the on-off valve 29 is issued. In practice, it is practical to operate the apparatus several seconds later than about 36 seconds later.
In this method, the rising time of the pump 9 is regarded as a very short time, the amount of water to be heated is the amount of water held in the heat source device, and the rising of the amount of water accompanying the operation of the pump is not involved.
[0038]
【The invention's effect】
As is apparent from the above description, according to the present invention, the on / off operation of the heat exchanger at the start of the unit control cycle time is eliminated. And since the temperature fluctuation of the supply hot water accompanying the turning on and off of the heat exchanger is also eliminated, a smooth start-up of the heating operation can be realized and a heating device with improved thermal efficiency can be provided.
[Brief description of the drawings]
FIG. 1 is a diagram schematically illustrating a configuration of a floor heating device according to an embodiment of the present invention.
FIG. 2 is a block diagram of a control unit provided in a heat source unit of the floor heating device of FIG.
FIG. 3 is an example of a time chart of a control unit.
FIG. 4 is a diagram schematically illustrating an example of a configuration of a conventional floor heating device.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 Floor heating device 3 Heat source unit 5 Floor heating room radiator 7 Heating expansion tank 9 Pump 11 Heat exchanger 13 Burner 15 Fan 17, 18 Return pipe 19 Outgoing pipe 21 High temperature pipe 23 Low temperature pipe 25 Gas supply pipe 27 Gas proportional valve 29 Opening / closing valve 31 Indoor radiator going pipe 33 Indoor radiator return pipe 35 Opening / closing valve 36 Bathroom heater 37 Bypass valve 39 Bypass pipe 40 Bypass pipes 41 and 43 Temperature sensor 50 Control unit 51 Operation table 53 Driver

Claims (2)

A heat source device for supplying hot water,
A radiator such as a floor heater receiving hot water supply from the heat source unit,
Hot water piping for circulating hot water between the heat source device and the radiator,
A thermal valve for opening and closing the hot water pipe;
A bypass pipe that bypasses the radiator and connects an outlet side and an inlet side of the heat source device,
A pump for flowing hot water in the pipe,
A temperature sensor for detecting a temperature of the hot water on the outlet side of the heat source device,
A control unit that receives the signal of the temperature sensor and controls the heat source device, the heat valve and the pump,
A heating device comprising:
A heating device, wherein, when starting to send hot water to the radiator, the control unit issues a command to each unit according to the following sequence;
(1) An open command is issued to the thermal valve.
(2) After that, before the thermal valve actually starts to open, the start command of the pump is issued.
{Circle around (3)} After the pump is started, a command to start combustion of the heat source unit is issued at a timing when the temperature detected by the temperature sensor does not rise to an allowable value before the thermal valve opens. The average temperature of water in the heat source unit at the time of the above (1) is Tp, the allowable value of the temperature detected by the temperature sensor is Tq, the amount of water retained in the heat source unit is Wr, and the average combustion output of the heat source unit at the start of combustion is Os. When the time from the issuance of the heat valve opening command to the start of combustion start is tu, and the time from when the heat valve opens to the actual start of opening after the opening command is tw,
tw>tu> tw− (Tq−Tp) × Wr ÷ Os
The heating device according to claim 1, wherein the tu is selected such that

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