JPH10300163A - Method for operating air conditioner and air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save energy and obtain a method for operating an air conditioner excellent in its maintenance by properly increasing or decreasing stages and operating a heat source machine with high efficiency. SOLUTION: A plurality of heat source machines 1 are provided with cooling water inlet temperature measuring means 14 and cooling water outlet temperature measuring means 15. The cooling capacity of the heat source machines 1 is estimated from the measured values of the measuring means. The operating number switching point of the heat source machines 1 is set based on the estimated value of a cooling capacity estimating means 16. Then, the cooling capacity of the heat source machines 1 changing depending on external conditions is estimated and the operating number switching point of the heat source machines 1 is automatically set. Thus, the heat source machines 1 are controlled by estimating the cooling capacity of the heat source machines 1 upon rise of the temperature of cooling water, so that the increase and decrease of auxiliary stages of the heat source machines 1 are prevented from being frequently generated. Further, the capacity of the heat source machines 1 is estimated and an operating number switching point set value of the heat source machines is changed, so that the operating efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner operating method and an air conditioner in which a plurality of heat source units are arranged for an air conditioner load.

[0002]

2. Description of the Related Art FIGS. 9 and 10 show a heat source control method and a heat source control apparatus shown in, for example, Air Conditioning and Sanitary Engineering, Vol. 60, No. 8, page 55, "Air Conditioning Equipment and Automatic Control (Part 2)". FIG. 9 is a diagram showing a conventional air conditioner, FIG. 9 is a circuit diagram of the air conditioner, and FIG. 10 is a flowchart illustrating the operation of the air conditioner of FIG. In the figure, 1 is a heat source device composed of a refrigerator that generates cold water or hot water,
Reference numeral 2 denotes a heat source pump provided for each of the heat source devices 1, and conveys cold water or hot water of the heat source device 1.

[0003] Numerals 3 denote cooling towers arranged in each of the heat source units 1 for cooling the corresponding heat source units 1. Reference numeral 4 denotes a cooling pump provided for each of the heat source units 1.
Is conveyed to the cooling tower 3. 5 is a forward header for mixing cold or hot water from the heat source unit 1, 6 is an air conditioning load that consumes energy of the cold and hot water, 7 is a two-way valve that regulates the flow rate of the cold and hot water by the air conditioning load, and 8 is a two-way valve. This is a load flow meter that measures the load flow from the valve 7.

[0004] 9 is a return header for mixing return cold and hot water, 1
0 is a header thermometer for measuring the temperature of cold and hot water in the header 5, 11 is a header thermometer for measuring the temperature of cold and hot water in the header 9, 12 is a heat source control device, and the load flow rate by the load flow meter 8. An appropriate number of heat source devices 1 are operated based on the temperature of the forward cooling hot water by the forward header thermometer 10 and the temperature of the returned cooling hot water by the return header thermometer 11. Although pressure control is performed as another control by the above-described devices, the description is omitted because it is not directly related to the present invention.

[0005] The conventional air conditioner is configured as described above, and is operated according to a flowchart shown in FIG.
That is, the purpose of the heat source device 1 control is to operate the appropriate number of heat source devices 1 with respect to the amount of heat or the flow rate on the air conditioning load 6 side. Therefore, in step 101, the heat source control device 12 uses the forward header thermometer 10 to measure the water supply temperature Ts and the return header Tr using the return header thermometer 11.
Further, the load flow rate Q is input by a value measured by the load flow meter 8.

Next, the routine proceeds to step 102, where the water supply temperature Ts is equal to or lower than the step-up correction threshold temperature, that is, normally 12 ° C. or lower, and the routine proceeds to step 103.
If it exceeds 2 ° C., the process proceeds to step 104. And
In step 103, the lower limit value of the return temperature Tr of the return header thermometer 11 is checked. If the return temperature is equal to or higher than the step-down correction threshold temperature, that is, normally 9 ° C. or more, the process proceeds to step 105, and is lower than the step-down correction threshold temperature. That is, if the temperature is usually lower than 9 ° C., Step 10
Proceed to 6.

Then, in step 105, the load calorific value is calculated by the following formula: load calorie = (Tr−Ts) × Q.
Proceeding to step 107, the calculated amount of heat is compared with the number of heat source devices 1 to be operated. For example, when the load heat amount is the set threshold value f2 of the unit control, the second unit is increased in number and the second unit of the heat source unit 1 is operated. In addition, the step-down is performed when the set threshold value f1 of the unit control is reached.

Next, the routine proceeds to step 108, where the load calorie is compared. If the load calorie exceeds the step-up position of f2, the routine proceeds to step 104, where the load calorie is set at the step-down side threshold value indicated by f1. If less than step 10
6 and if there is a load heat amount between the switching values of the increase / decrease stage of the heat source unit 1, neither the stage increase nor the stage decrease is performed and the step 10 is performed.
Return to 1.

In step 104, the number of the heat source units 1 is increased by one, and the routine proceeds to step 109, where the routine returns to step 101 after a lapse of a predetermined time by the timer for increasing the number of units. In step 106, the number of the heat source devices 1 is reduced by one, and the routine proceeds to step 110, and returns to step 101 after a lapse of a predetermined time period by the step-down timer. As described above, when the water supply temperature is 12 ° C. or higher, the heat source unit 1 is increased as an auxiliary stage, and when the return water temperature is less than 9 ° C., the heat source unit 1 is staged as an auxiliary stage. .

[0010] However, in normal control of the number of units, an increase / decrease stage corresponding to a preset threshold value of the load heat amount is performed. Further, the forced increase / decrease stage occurs when there is a sudden load change, or when the refrigeration capacity of the heat source unit 1 is insufficient. In the former case, the auxiliary step-up and the auxiliary step-down have the effect of increasing the response speed. However, in the latter case, the frequency of increasing the number of steps becomes extremely large, so that energy is wasted and this is not a desirable control in terms of energy consumption.

[0011]

In the conventional air conditioner operating method and air conditioner as described above, the auxiliary increase / decrease stage is frequently repeated because the increase / decrease stage point in the normal state is fixed. Therefore, the originally determined heat source unit 1
The energy consumption increases compared to the step-up and step-down points. In addition, since the increase / decrease stage point in normal time is fixed,
By setting the set value of the increase / decrease stage point considerably lower than the maximum value of the heat source capacity, it is possible to cope with a decrease in the heat source capacity due to external conditions.

That is, the heat source unit 1 is normally operated at 100% operation.
Is the maximum efficiency. However, since the step-up point set value is reduced in consideration of safety, for example, the switching is performed at 90% capacity, the efficiency of the heat source unit 1 is reduced and energy consumption is increased. In addition, even if the performance of the heat source device 1 is reduced due to contamination of the cooling water pipe wall due to the auxiliary stage, the cause thereof is masked, and there is a problem that an appropriate maintenance time is overlooked.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and the operation of the air conditioner is improved by appropriately increasing or decreasing the number of steps, whereby the heat source unit is operated with high efficiency and the maintainability is excellent. It is an object to obtain a method and an air conditioner.

[0014]

In the method for operating an air conditioner according to the present invention, a cooling water inlet temperature measuring means and a cooling water outlet temperature measuring means are provided in each of a plurality of heat source units, and the cooling water inlet temperature measuring means is provided. Means and a number switching point setting means for setting the number of operating heat source equipment switching points via the estimated value by the cooling capacity estimating means for estimating the cooling capacity of the heat source equipment from the measured values of the cooling water outlet temperature measuring means to the heat source control device. In this case, the heat source functional force that changes according to external conditions is estimated, and the number of heat source device operating units switching point is automatically set.

In the method for operating an air conditioner according to the present invention, a plurality of heat source units are provided, and an outside air temperature measuring unit for measuring an outside air temperature is provided. The heat source control device is provided with a number switching point setting means for setting the number of operating heat source unit switching points based on the estimated value of the cooling capacity estimating means for estimating the cooling capacity of the heat source device, and estimating the heat source functional force that changes according to external conditions. , The number of heat source device operation number switching points is automatically set.

In the method for operating an air conditioner according to the present invention, the notifying means is provided, and when the cooling capacity of the heat source unit estimated by the cooling capacity estimating means is smaller than a predetermined value, the notifying means notifies the abnormality occurrence. Is performed.

Also, in the air conditioner according to the present invention, a plurality of heat source devices, cooling water inlet temperature measuring means and cooling water outlet temperature measuring means provided respectively for these heat source devices, and a cooling water inlet temperature Cooling capacity estimating means for estimating the cooling capacity of the heat source device from the measured values of the measuring means and the cooling water outlet temperature measuring means; and a number switching point setting for setting the number of operating heat source device switching points based on the estimated value by the cooling capacity estimating means. Means for estimating a heat source functional force that varies depending on external conditions through outputs of the cooling capacity estimating means and the number of switching points setting means, and automatically setting the number of switching points for the number of operating heat source apparatuses, and setting the number of operating points for the number of heat source apparatuses according to the air conditioning load. And a heat source control device for operating the required number of the heat sources.

Further, in the air conditioner according to the present invention, a plurality of heat source units, an outside air temperature measuring unit for measuring an outside air temperature, and a cooling capacity of the heat source unit are estimated from the measured values of the outside air temperature measuring unit. A cooling capacity estimating means, a number switching point setting means for setting a switching point of the number of operating heat source units based on an estimated value by the cooling capacity estimating means, and an external condition through an output of the cooling capacity estimating means and the number switching point setting means. A heat source control device is provided for estimating the changing heat source functional force, automatically setting the number of operating heat source devices, and operating the required number of heat source devices in accordance with the air conditioning load.

In the air conditioner according to the present invention, there is provided a notifying means which is energized when the cooling capacity of the heat source device estimated by the cooling capacity estimating means is smaller than a predetermined value. A heat source control device for notifying the occurrence of an abnormality by an operation is provided.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. 1 to 5 are diagrams showing an example of an embodiment of the present invention. FIG. 1 is a circuit diagram of an air conditioner, FIG. 2 is a flowchart illustrating the operation of the air conditioner of FIG.
3 is a flowchart illustrating another operation of the air conditioner of FIG. 1, FIG. 4 is a graph showing a relationship between the cooling capacity and the chilled water outlet temperature of the air conditioner of FIG. 1, and FIG. FIG. 4 is a main part circuit diagram showing a configuration for detecting a decrease in cooling capacity.

In the drawing, reference numeral 1 denotes a heat source unit comprising a refrigerator for generating cold water or hot water, and 2 denotes a heat source pump provided corresponding to each of the heat source units 1, which conveys cold or hot water of the heat source unit 1. I do. Numeral 3 is a cooling tower arranged in each of the heat source units 1 to cool the corresponding heat source unit 1. Reference numeral 4 denotes a cooling pump provided for each of the heat source units 1, and conveys cooling water of the heat source unit 1 to the cooling tower 3.

5 is an outgoing header for mixing cold or hot water from the heat source unit 1, 6 is an air conditioning load that consumes energy of the cold and hot water, 7 is a two-way valve that regulates the flow rate of cold and hot water by the air conditioning load, 8 Is a load flow meter for measuring the load flow rate from the two-way valve 7, 9 is a return header for mixing return cold and hot water, 1
Numeral 0 denotes a header thermometer for measuring the temperature of the cold / hot water in the header 5, and reference numeral 11 denotes a thermometer for the header which measures the temperature of the cold water in the header 9.

Reference numeral 12 denotes a heat source control device, which operates an appropriate number of heat source devices 1 according to the load flow rate by the load flow meter 8, the temperature of the hot and cold water by the forward header thermometer 10, and the temperature of the hot and cold water by the return header thermometer 11. I do. 13 is a heat source unit 1
, A refrigerant outlet temperature measuring means for measuring the refrigerant outlet temperature of the heat source device 1, and 14 a cooling water inlet temperature measuring means of the heat source device 1.

15 is a means for measuring the temperature of the cooling water outlet of the heat source unit 1, 16 is a means for estimating the cooling capacity of the heat source unit 1 provided in the heat source control unit 12, and 17 is a unit for setting the number of switching units provided in the heat source control unit 12. It is. However, the cooling water inlet temperature measuring means 14 and the cooling water outlet temperature measuring means 15 are often measurement points in a general air conditioner, and are not added as new components. In addition, pressure control is performed as control in addition to the control by the above-described devices, but the description is omitted because it is not directly related to the present invention.

In the air conditioner configured as described above, as shown in the flowchart of FIG.
In many cases, almost the same operation as in the flowchart of FIG. Then, in step 201, the cooling capacity is estimated and the number of units to be switched is set. However, before that, an operation before reaching step 201, that is, an operation when step 201 is not performed will be described. That is, it is assumed that the load heat amount or the load flow rate for increasing the number of stages of the heat source device 1 in the normal state is at the value of f2.

If the capacity of the heat source unit 1 is increased to the load heat amount normally set in step 208, the heat source unit 1
Is performed next. However, if the temperature of the cooling water rises or the cooling tower 3 becomes dirty, the cooling capacity of the heat source device 1 decreases, and the cooling capacity does not increase to the value of f2. In this case, the temperature of the forward header 5 further rises, and as a result, the step is increased by the auxiliary step-up via step 203, and the temperature of the forward header 5 finally falls.

As a problem of the auxiliary step-up due to the above reasons, since the water temperature rises up to the threshold of the auxiliary step-up temperature, it is necessary to cool the temperature rise after the step-up. This is wasteful in terms of energy, and in the case of the above-mentioned causes, the auxiliary step-up may occur many times. In response to such a problem, the temperature rise of the cooling water and the contamination of the cooling tower 3 are detected by the cooling water inlet temperature measuring means 14 and the cooling water outlet temperature measuring means 15.

Then, the cooling capacity of the heat source unit 1 is estimated from the measured values of the cooling water inlet temperature measuring means 14 and the cooling water outlet temperature measuring means 15 by the cooling capacity estimating means 16. This estimated value is set as a new set value by the number switching point setting means 17. That is, the new set value is represented by the following equation 1.

F (2k) = Qk × Kd × Kt (Equation 1) f (2k−1) = f (2k) × α where f (2k): new step-up switching point setting value f (2k−1) ): New step-down switching point set value Qk: kth heat source unit reference cooling capacity Kd: capacity coefficient due to coil contamination Kt: capacity coefficient based on cooling water temperature and cold water setting temperature α: relative to actual cooling capacity of heat source unit Ratio coefficient of step-down point k: varies from 1 to the number of heat source units

The capacity coefficient Kt based on the cooling water temperature and the set chilled water temperature in Equation 1 can be calculated from the cooling capacity characteristic of the heat source unit 1. An example of this cooling capacity characteristic is shown in the graph of FIG. In FIG. 4, the horizontal axis indicates the cooling water outlet temperature, and the vertical axis indicates the cooling capacity, and the cooling water inlet temperature is shown as a parameter. If the cooling water temperature can be lowered in this characteristic,
It can be seen that the cooling capacity is higher than the reference capacity, and that the cooling capacity is lower than the reference capacity if the cooling water temperature is increased by the influence of the outside air temperature.

For example, when the cooling water outlet temperature set value is 7 ° C. and the cooling water inlet temperature is 30 ° C., the cooling capacity is 100 USRT (US refrigeration ton), which is the reference refrigeration capacity. Further, when the cooling water outlet temperature set value and the cooling water inlet temperature are arbitrarily selected, the cooling capacity is obtained by interpolation from the closest cooling water inlet temperature characteristic in FIG.

For example, in FIG.
At a cooling water outlet temperature of 6.5 ° C, a cooling water outlet temperature of 6.5 ° C, a cooling water inlet temperature of 30 ° C, and a cooling water outlet temperature of 6.5 ° C. Cooling water inlet temperature 35
It can be obtained by a point C obtained by dividing the line connecting the points B at ° C into four to one. That is, in this example, 93US
RT, and the performance coefficient Kt is 0.97.

Since a decrease in the cooling capacity also occurs due to a decrease in the efficiency of the condenser of the heat source unit 1, a method for obtaining a coefficient of decrease in the cooling capacity due to contamination of the cooling coil will be described below with reference to the configuration shown in FIG. The measurement of the cooling capacity due to the contamination of the cooling coil is shown on page 33 of “Refrigeration Magazine Vol. 69, No. 805, page 29,“ Maintenance and Service of Refrigeration and Air Conditioning Equipment (Part 2) 18. Absorption Refrigerator ”. There are some methods.

The method of measuring the cooling capacity due to the contamination of the cooling coil by the above-described freezing magazine is also used for estimating the deterioration of the cooling capacity due to the contamination of the cooling pipe wall in the embodiments of FIGS. That is, when the efficiency of the condenser of the heat source device 1 is lower than the reference, the cooling water outlet temperature Tro becomes lower than the reference temperature, and the refrigerant outlet temperature Te becomes higher than the reference temperature. Therefore, the temperature difference Δ represented by Te-Tro
T increases as the condenser tube wall becomes dirty.

Then, the relationship between the temperature difference ΔT and the cooling capacity is determined based on data measured in advance, and the temperature difference is obtained once in a certain period of time to obtain a capacity coefficient Kd due to contamination of the condenser tube wall. The above control is performed in step 201 in the flowchart shown in FIG. The details of step 201 are shown in the flowchart of FIG.
In step 301, n = 1 is set and step 3
02 and the measured value T by the cooling water inlet temperature measuring means 14
Enter ri.

Next, the routine proceeds to step 303, where a capacity reduction coefficient Kt of the heat source unit 1 is calculated from the preset cold / hot water outlet temperature and the cooling water inlet temperature Tri obtained in step 302. Next, in steps 304 to 306, a capacity reduction coefficient Kd due to contamination of the coil tube wall is obtained. That is, in step 304, the cooling water outlet temperature measuring means 1
5 to input the measured value Tro. Step 305
Then, the measured value Te is input from the refrigerant outlet temperature measuring means 13.

In step 306, a temperature difference ΔT between the measured value Tro and the measured value Te is calculated, and a capacity reduction coefficient Kd due to contamination of the cooling water is calculated. Next, step 307
Then, the cooling capacity estimating means 16 of the heat source unit 1 calculates the above-mentioned equation 1 to calculate the cooling capacity of each heat source unit 1. Then, the process proceeds to step 308, where the estimated value of the cooling capacity of the heat source unit 1 is set to f (2
n) and f (2n-1) are set as switching points.

Next, the routine proceeds to step 309, where 1 is added to n to make n = 2. Then, the process proceeds to step 310, and if n> k-1, step 2 in the flowchart of FIG.
02, and returns to step 302 if n> k−1. Then, the performance estimation and the change of the set value of the heat source unit 1 at the next stage are performed in steps 302 to 308. Here, k indicates the number of heat source units 1, and the above control loop is performed for each of the number of installed heat source units 1 by 1.
Repeat each time.

As described above, since the switching position of the number of the heat source units 1 is determined at a point where the temperature of the cold / hot water rises and falls less, a more stable cold / hot water temperature can be supplied and wasteful energy consumption can be achieved. Can be suppressed. The description of the method of changing the steady-state switching point value of the number of heat source devices 1 based on the estimation of the cooling capacity of the heat source device 1 has been completed.

Next, a method of setting a cycle for changing the set value of the number of changeover points will be described. That is, FIG.
In step 212 of the flowchart of FIG. For example, if the set value is to be changed in a one-hour cycle, the control is transferred to step 212 using an interrupt by a one-hour timer (not shown). Further, in step 201, the cooling capacity estimation of the heat source unit 1 and the switching point set value of the number of operating heat source units 1 are changed to respond.

The above-mentioned one-hour timer is merely an example, and the set value of the number of operating heat source units 1 can be set at an appropriate time period. Further, the configuration of the device described above can be configured by H / W,
Further, the configuration may be such that the program is executed by a program using a CPU and a memory. Although the number of heat source units 1 has been described as two in the embodiment of FIGS. 1 to 5, even an air conditioner in which an appropriate number of heat source units 1 are arranged, the number of heat source units 1 shown in FIGS. The same operation as that of the embodiment can be obtained.

As described above, in the embodiment shown in FIGS. 1 to 5, in short, the cooling capacity of the heat source unit 1 is estimated by the cooling capacity estimating means 16 via the rise in the temperature of the cooling water. Control corresponding to the cooling capacity is performed. Thereby, frequent occurrence of the auxiliary increase / decrease stage due to the fluctuation of the cooling capacity of the heat source unit 1 can be prevented, and waste of energy can be prevented.

Further, the cooling capacity of the heat source unit 1 is estimated, and the switching point set value of the number of operating heat source units 1 is changed. Further, a cycle for changing the set point value of the number of operating heat source devices 1 is appropriately set. by this,
The switching point of the number of operating heat source units 1 can be set to a higher point by grasping the cooling capacity of the heat source unit 1 with high accuracy,
The operation efficiency of the heat source device 1 can be improved.

Embodiment 2 FIG. 6 is a circuit diagram of an air conditioner showing an example of another embodiment of the present invention. In the figure, the same reference numerals as those in FIGS.
Is an outside air temperature measuring means connected to the cooling capacity estimating means 16.

In the air conditioner configured as described above, the outside air temperature from the outside air temperature measuring unit 18 is directly input to the cooling capacity estimating unit 16, and the cooling capacity estimating unit 16 of the heat source unit 1 estimated from the outside air temperature is used. Then, the switching point set value of the number of operating heat source units 1 is changed depending on the cooling capacity. That is, the relationship between the outside air temperature and the cooling capacity of the heat source device 1 is as described below.

Since the temperature of the cooling water from the cooling tower 3 changes due to the change in the outside air temperature, the cooling capacity of the heat source unit 1 indirectly changes due to the outside air temperature. That is, FIGS.
In the embodiment, the cooling water temperature fluctuation is directly measured by the cooling water inlet temperature measuring means 14 to estimate the cooling capacity. However, in the embodiment of FIG. 6, the cooling capacity fluctuation is estimated using the fluctuation of the outside air temperature as a parameter.

The operation method of the air conditioner in the embodiment shown in FIG. 6 is also substantially the same as that in the embodiment shown in FIGS. 1 to 5, except that steps 302 to 306 in the flowchart shown in FIG. Instead, the outside air temperature is input from the outside air temperature measuring means 18. Step 30
In step 7, the relationship between the outside air temperature and the cooling capacity of the heat source unit 1 is determined from data acquired in advance instead of the above-described equation 1, and the cooling capacity of the heat source unit 1 is estimated.

Thereafter, the control for setting the cooling capacity set value in step 308 is the same as in the embodiment shown in FIGS. In such an operation method in which the outside air temperature is input from the outside air temperature measurement unit 18, the estimation accuracy is lower than in the method in which the cooling water temperature fluctuation is directly measured by the cooling water inlet temperature measurement unit 14 to estimate the cooling capacity. .
However, the cooling capacity of the heat source unit 1 can be easily estimated at a small cost with a simpler device configuration.

In the embodiment shown in FIG. 6 as well, the cooling capacity estimating means 16 estimates the cooling capacity of the heat source unit 1 based on the measured outside air temperature of the outside air temperature measuring unit 18 to cool the heat source unit 1. Control corresponding to the ability is performed. Thereby, frequent occurrence of the auxiliary increase / decrease stage due to the fluctuation of the cooling capacity of the heat source unit 1 can be prevented, and waste of energy can be prevented. Further, the cooling capacity of the heat source unit 1 can be grasped with high accuracy, and the switching point of the number of operating heat source units 1 can be set to a higher point, so that the operation efficiency of the heat source unit 1 can be improved.

Embodiment 3 FIG. 7 is a circuit diagram of an air conditioner showing an example of another embodiment of the present invention. In the figure, the same reference numerals as those in FIGS.
Is a notification unit provided in the heat source control device 12 for outputting a maintenance alarm in relation to the estimated cooling capacity.

The operation method of the air conditioner in the embodiment of FIG. 7 is also substantially the same as that of the embodiment of FIGS. 1 to 5, but the control described below in step 308 of the flowchart shown in FIG. Done. That is,
Instead of setting the cooling capacity of the heat source unit 1, when the cooling capacity of the heat source unit 1 estimated by the cooling capacity estimating unit 16 is smaller than a predetermined value, the notifying unit 19 is energized to notify the occurrence of an abnormality.

In the embodiment shown in FIG. 7, the cooling capacity estimating means 16 also increases the temperature of the cooling water to increase the temperature.
The cooling capacity of the heat source unit 1 is estimated and controlled according to the cooling capacity of the heat source unit 1. Thereby, frequent occurrence of the auxiliary increase / decrease stage due to the fluctuation of the cooling capacity of the heat source unit 1 can be prevented, and waste of energy can be prevented.

Further, the cooling capacity of the heat source unit 1 is grasped with high accuracy, and the switching point of the number of operating heat source units 1 can be set to a higher point, so that the operation efficiency of the heat source unit 1 can be improved. Further, since the occurrence of the abnormality is reported by the reporting means 19, the maintenance work can be easily performed in a timely manner, and the maintenance efficiency can be improved.

Embodiment 4 FIG. 8 is also a circuit diagram of an air conditioner showing an example of another embodiment of the present invention. In the figure, the same reference numerals as those in FIGS.
Is an outside air temperature measuring means connected to the cooling capacity estimating means 16,
Reference numeral 19 denotes a notification unit provided in the heat source control device 12 for outputting a maintenance alarm in relation to the estimated cooling capacity.

The operation method of the air conditioner in the embodiment of FIG. 8 is almost the same as that of the embodiment of FIGS. 1 to 5, except that the control described below in step 308 in the flowchart shown in FIG. Done. That is,
Instead of setting the estimated cooling capacity of the heat source unit 1, when the estimated cooling capacity of the heat source unit 1 is smaller than a predetermined value, the notifying unit 19 is energized to notify the occurrence of an abnormality.

In the embodiment shown in FIG. 8 as well, the cooling capacity of the heat source unit 1 is estimated by the cooling capacity estimating unit 16 based on the measured outside air temperature of the outside air temperature measuring unit 18 to cool the heat source unit 1. It is controlled according to the ability. As a result, frequent occurrence of the auxiliary increase / decrease stage due to the fluctuation of the cooling capacity of the heat source unit 1 can be prevented, and waste of energy can be prevented.

Further, the cooling capacity of the heat source unit 1 is grasped with high accuracy, and the switching point of the number of operating heat source units 1 can be set to a higher point, so that the operation efficiency of the heat source unit 1 can be improved. Further, since the occurrence of the abnormality is reported by the reporting means 19, the maintenance work can be easily performed in a timely manner, and the maintenance efficiency can be improved.

[0058]

As described above, according to the present invention, the cooling water inlet temperature measuring means and the cooling water outlet temperature measuring means are provided in each of a plurality of heat source units, and the cooling water inlet temperature measuring means and the cooling water outlet temperature measuring means are provided. The number-of-operations switching point setting means for setting the number-of-operations-number-of-operations switching points of the heat source unit based on the estimated value of the cooling capacity estimation unit for estimating the cooling capacity of the heat source unit from the measured value of The function of the heat source function is estimated, and the point of switching the number of operating heat source devices is automatically set.

As a result, the cooling capacity of the heat source unit is estimated by the cooling capacity estimating means via the temperature rise of the cooling water, and control corresponding to the cooling capacity of the heat source unit is performed. Thus, there is an effect of preventing frequent occurrence of the auxiliary increase / decrease stage due to fluctuation of the cooling capacity of the heat source device, thereby preventing waste of energy.
Further, the cooling capacity of the heat source unit is estimated, and the switching point set value of the number of operating heat source units is changed. Therefore, since the cooling capacity of the heat source unit is grasped with high accuracy and the switching point of the number of operating heat source units is set to a higher point,
This has the effect of improving the operation efficiency of the heat source unit.

As described above, according to the present invention, a plurality of heat source units are provided, and an outside air temperature measuring unit for measuring the outside air temperature is provided, and the cooling capacity of the heat source unit is determined from the measured value of the outside air temperature measuring unit. The heat source control device is provided with a number switching point setting means for setting a switching point of the number of operating heat source units based on the estimated value of the cooling capacity estimating means to estimate a heat source functional force that changes according to external conditions, and The switching point is automatically set.

Thus, the cooling capacity estimating means estimates the cooling capacity of the heat source unit based on the measured outside air temperature of the outside air temperature measuring unit, and performs control corresponding to the cooling capacity of the heat source unit. Thus, there is an effect of preventing frequent occurrence of the auxiliary increase / decrease stage due to fluctuation of the cooling capacity of the heat source device, thereby preventing waste of energy. Further, the cooling capacity of the heat source unit is estimated, and the switching point set value of the number of operating heat source units is changed.
Therefore, the cooling capacity of the heat source unit is grasped with high accuracy,
Since the switching point of the number of operating heat source units is set to a higher point, there is an effect of improving the operating efficiency of the heat source units.

Further, as described above, the present invention is provided with a notifying means, and when the cooling capacity of the heat source unit estimated by the cooling capacity estimating means is smaller than a predetermined value, the notifying means notifies the occurrence of abnormality. is there.

Thus, the cooling capacity estimating means estimates the cooling capacity of the heat source unit based on the temperature rise of the cooling water or the measured value of the outside air temperature, and performs control corresponding to the cooling capacity of the heat source unit. Thus, there is an effect of preventing frequent occurrence of the auxiliary increase / decrease stage due to fluctuation of the cooling capacity of the heat source device, thereby preventing waste of energy. Further, the cooling capacity of the heat source unit is estimated, and the switching point set value of the number of operating heat source units is changed.

Accordingly, since the cooling capacity of the heat source unit is grasped with high accuracy, and the switching point of the number of operating heat source units is set to a higher point, the operation efficiency of the heat source unit is improved. Further, when the estimated cooling capacity of the heat source device is smaller than a predetermined value, the occurrence of the abnormality is reported by the reporting means, so that the maintenance work can be easily performed in a timely manner, thereby improving the maintenance efficiency.

Further, as described above, the present invention provides a plurality of heat source units, a cooling water inlet temperature measuring unit and a cooling water outlet temperature measuring unit provided in each of these heat source units, and a cooling water inlet temperature measuring unit. Means and a cooling capacity estimating means for estimating the cooling capacity of the heat source device from the measured values of the cooling water outlet temperature measuring means, and a number switching point setting means for setting a switching point for the number of operating heat source devices based on the estimated value by the cooling capacity estimating means. And estimating the heat source functional force that changes depending on external conditions via the outputs of the cooling capacity estimating means and the number switching point setting means, and automatically setting the number of operating heat source equipment switching points to change the number of operating heat source equipment according to the air conditioning load. And a heat source control device for operating the required number of units.

As a result, the cooling capacity of the heat source unit is estimated by the cooling capacity estimating means via the temperature rise of the cooling water, and control corresponding to the cooling capacity of the heat source unit is performed. Thus, there is an effect of preventing frequent occurrence of the auxiliary increase / decrease stage due to fluctuation of the cooling capacity of the heat source device, thereby preventing waste of energy.
Further, the cooling capacity of the heat source unit is estimated, and the switching point set value of the number of operating heat source units is changed. Therefore, since the cooling capacity of the heat source unit is grasped with high accuracy and the switching point of the number of operating heat source units is set to a higher point,
This has the effect of improving the operation efficiency of the heat source unit.

Further, as described above, the present invention provides a plurality of heat source units, an outside air temperature measuring means for measuring the outside air temperature,
Cooling capacity estimating means for estimating the cooling capacity of the heat source device from the measured value of the outside air temperature measuring means; number switching point setting means for setting the operating number switching point of the heat source device based on the estimated value by the cooling capacity estimating means; Estimating the heat source functional force that changes depending on external conditions via the outputs of the capacity estimating means and the number switching point setting means, and automatically setting the number of operating heat source equipment switching points to determine the required number of heat source units in accordance with the air conditioning load And a heat source control device for operating the device.

As a result, the cooling capacity estimating means estimates the cooling capacity of the heat source unit based on the measured outside air temperature of the outside air temperature measuring unit, and performs control corresponding to the cooling capacity of the heat source unit. Thus, there is an effect of preventing frequent occurrence of the auxiliary increase / decrease stage due to fluctuation of the cooling capacity of the heat source device, thereby preventing waste of energy. Further, the cooling capacity of the heat source unit is estimated, and the switching point set value of the number of operating heat source units is changed.
Therefore, the cooling capacity of the heat source unit is grasped with high accuracy,
Since the switching point of the number of operating heat source units is set to a higher point, there is an effect of improving the operating efficiency of the heat source units.

Further, as described above, the present invention includes a notifying means which is activated when the cooling capacity of the heat source device estimated by the cooling capacity estimating means is smaller than a predetermined value,
A heat source control device for notifying the occurrence of an abnormality by the operation of the notifying means is provided.

Thus, the cooling capacity estimating means estimates the cooling capacity of the heat source unit based on the temperature rise of the cooling water or the measured value of the outside air temperature, and performs control corresponding to the cooling capacity of the heat source unit. Thus, there is an effect of preventing frequent occurrence of the auxiliary increase / decrease stage due to fluctuation of the cooling capacity of the heat source device, thereby preventing waste of energy. Further, the cooling capacity of the heat source unit is estimated, and the switching point set value of the number of operating heat source units is changed.

Therefore, since the cooling capacity of the heat source unit is grasped with high accuracy and the switching point of the number of operating heat source units is set to a higher point, the operation efficiency of the heat source unit is improved. Further, when the estimated cooling capacity of the heat source device is smaller than a predetermined value, the occurrence of the abnormality is reported by the reporting means, so that the maintenance work can be easily performed in a timely manner, thereby improving the maintenance efficiency.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a first embodiment of the present invention, and is a circuit diagram of an air conditioner.

FIG. 2 is a flowchart illustrating the operation of the air-conditioning apparatus of FIG.

FIG. 3 is a flowchart illustrating another operation of the air conditioner of FIG. 1;

FIG. 4 is a graph showing a relationship between a cooling capacity and a chilled water outlet temperature of the air conditioner of FIG. 1;

5 is a main part circuit diagram showing a configuration for detecting a decrease in cooling capacity of the air-conditioning apparatus of FIG. 1;

FIG. 6 is a diagram showing the second embodiment of the present invention, and is a circuit diagram of an air conditioner.

FIG. 7 is a view showing a third embodiment of the present invention, and is a circuit diagram of an air conditioner.

FIG. 8 shows a fourth embodiment of the present invention, and is a circuit diagram of an air conditioner.

FIG. 9 is a diagram showing a conventional air conditioner, and is a circuit diagram of the air conditioner.

FIG. 10 is a flowchart illustrating the operation of the air-conditioning apparatus of FIG. 9;

[Explanation of symbols]

1 heat source unit, 12 heat source control device, 14 cooling water inlet temperature measuring means, 15 cooling water outlet temperature measuring means, 16 cooling capacity estimating means, 17 number switching point setting means, 18 outside air temperature measuring means, 19 notification means.

Claims (6)

[Claims] 1. A cooling water inlet temperature measuring means and a cooling water outlet temperature measuring means are provided in each of a plurality of heat source devices, and the cooling water inlet temperature measuring means and the cooling water outlet temperature measuring means are used to calculate the temperature of the heat source device. A heat source control device is provided with a number switching point setting means for setting a switching point of the number of operating heat source units based on an estimated value of a cooling capacity estimating means for estimating a cooling capacity, and estimates a heat source functional force that changes according to external conditions. Operating method of an air conditioner for automatically setting a switching point for the number of operating heat source units. 2. A cooling capacity estimating means for providing a plurality of heat source units and an outside air temperature measuring unit for measuring an outside air temperature, and estimating a cooling capacity of the heat source unit from a measured value of the outside air temperature measuring unit. A heat source control device is provided with a heat source control device with a heat source control device for setting the heat source device operation number switching point based on the value, and automatically sets the heat source device operation number switching point by estimating a heat source functional force that changes according to external conditions. How to operate the air conditioner. 3. The system according to claim 1, further comprising a notifying unit, wherein when the cooling capacity of the heat source device estimated by the cooling capacity estimating unit is smaller than a predetermined value, the notifying unit notifies the abnormality occurrence. 3. The method for operating an air conditioner according to any one of 2. 4. A plurality of heat source units, a cooling water inlet temperature measuring unit and a cooling water outlet temperature measuring unit provided in each of the heat source units, and the cooling water inlet temperature measuring unit and the cooling water outlet temperature measuring unit. Cooling capacity estimating means for estimating the cooling capacity of the heat source device from the measured value of the heat source device, and a number switching point setting means for setting an operating number switching point of the heat source device by the estimated value by the cooling capacity estimating device,
Estimating the heat source functional force that changes depending on external conditions via the outputs of the cooling capacity estimating means and the number switching point setting means, and automatically setting the number of operating heat source equipment switching points to change the number of operating heat source equipment according to the air conditioning load. An air conditioner comprising: a heat source control device that operates the required number of units. 5. A plurality of heat source units, an outside air temperature measuring unit for measuring an outside air temperature, a cooling capacity estimating unit for estimating a cooling capacity of the heat source unit from a measured value of the outside air temperature measuring unit, The number-of-operations switching point setting means for setting the number-of-operations-switching points of the heat source units based on the estimated value by the estimating means, and the heat source functional force that changes according to external conditions through the outputs of the cooling capacity estimating means and the number of switching points. And a heat source control device that automatically sets the number of operating heat source devices and switches the required number of the heat source devices according to the air conditioning load. 6. A heat source control device which is provided with a notifying means which is energized when the cooling capacity of the heat source device estimated by the cooling capacity estimating means is smaller than a predetermined value, and which notifies the occurrence of an abnormality by the operation of the notifying means. 5. The method according to claim 4, wherein
An air conditioner according to any one of claims 5 to 7.