JP6921039B2 - Unit control device and program - Google Patents

Description

The present invention relates to a number control device and a program, particularly to control the number of operating heat source machines that supply cold and hot water to a load.

In central air conditioning, when controlling the number of operating heat source units that supply cold and hot water to the load of the air conditioner, etc., if the number of heat source units is not operating at an appropriate number according to the demand, the number of heat source units can be increased or decreased. The number of units may be increased or decreased by performing.

For example, conventionally, a technique has been proposed in which the number of operating heat source machines is increased or decreased by referring to the value of the water supply temperature supplied from the heat source machine to the load (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-77621 Japanese Unexamined Patent Publication No. 2003-294290 Japanese Unexamined Patent Publication No. 2000-18672 Japanese Unexamined Patent Publication No. 8-261544 Japanese Unexamined Patent Publication No. 61-225533

However, if the number of stages of increase / decrease of the heat source machine is set by referring only to the water supply temperature as in the prior art, it may not be possible to appropriately control the increase / decrease stage of the heat source machine, for example, hunting may occur. rice field. That is, the water supply temperature supplied to the load may not meet the demand on the load side.

An object of the present invention is to perform more appropriate increase / decrease stage control by referring to the water supply temperature and the return water temperature.

The number control device according to the present invention includes a number control means for controlling the number of operating heat source machines that supply cold / hot water to the load according to the load state, and a hot / cold water supply to the load. A first acquisition means for acquiring a requirement indicating the ability of the heat source machine required to eliminate the difference between the temperature and the target water supply temperature, which continuously changes according to a change in the water supply temperature. , It is a requirement indicating the ability of the heat source machine required to eliminate the difference between the return water temperature of the cold / hot water that has passed the load and the target return water temperature, and is continuous according to the change of the return water temperature. A second acquisition means for acquiring the required degree that changes to, and a setting means for setting the increase / decrease number of the heat source machine based on the total value of the acquired required degree when the required degree is acquired by each of the acquired means. Operation control that corrects the operating number of the heat source machine determined by the number control means by the increase / decrease number set by the setting means, and controls the operation of the heat source machine according to the corrected operating number of the heat source machine. It is characterized by having means and.

Further, the setting means is the heat source machine corresponding to the total value of the demands acquired by each acquisition means based on the number increase / decrease information in which the relationship between the demand for the heat source machine and the increase / decrease number of the heat source machines is set. It is characterized by setting the number of units to be increased or decreased.

Further, the setting means is characterized in that the number of heat source machines is increased or decreased when a predetermined condition is satisfied.

Further, the predetermined condition is characterized in that the state in which the flow rate of the cold / hot water passing through the load becomes equal to or higher than a predetermined threshold value continues for a predetermined time.

Further, the setting means is characterized in that when the state of not satisfying the predetermined condition continues for a predetermined time, the setting of the increase / decrease number of the heat source machines is stopped.

Further, the operation control means does not correct the number of the heat source machines determined by the number control means until it is continuously set for a predetermined time to increase or decrease the heat source machines operated by the setting means. And.

The program according to the present invention is a unit control means for controlling the number of operating units of a heat source machine that supplies cold / hot water to the load according to a load state, and a water supply of cold / hot water supplied to the load. The first acquisition means for acquiring the requirement indicating the ability of the heat source machine required to eliminate the difference between the temperature and the target water supply temperature and continuously changing according to the change in the water supply temperature. It is a requirement indicating the ability of the heat source machine required to eliminate the difference between the return water temperature of the cold / hot water that has passed the load and the target return water temperature, and is continuously corresponding to the change of the return water temperature. A second acquisition means for acquiring a changing requirement, a setting means for setting an increase / decrease in the number of heat source machines based on the total value of the acquired requirements when the requirement is acquired by each acquisition means, the number of units. As an operation control means that corrects the operating number of the heat source machine determined by the control means by the increase / decrease number set by the setting means, and controls the operation of the heat source machine according to the corrected operating number of the heat source machine. Make it work.

According to the present invention, more appropriate increase / decrease stage control can be performed by referring to the water supply temperature and the return water temperature.

In addition, it is possible to prevent hunting due to repeated excessive increase / decrease stages of the heat source machine.

It is a schematic overall block diagram of the heat source system in this embodiment. It is a block block diagram of the control device in this embodiment. It is a flowchart which shows the increase / decrease stage control process in this embodiment. It is a figure which shows the relationship between the water supply temperature and the required degree in a graph form in this embodiment. It is a figure which shows the relationship between the return water temperature and the required degree in a graph form in this embodiment. It is a figure which shows the relationship between the total demand degree and the increase / decrease number of heat source machines to operate in this embodiment in a graph format.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic overall configuration diagram of a heat source system according to the present embodiment. In FIG. 1, a load 1, a heat source machine 2, headers 3 to 6 for storing a heat medium (cold / hot water), a pump 7 as an auxiliary machine of the heat source machine 2, a secondary pump 8, a water supply channel 9, and a return water channel 10 are shown. A communication pipe 11 that bypasses between the header 4 and the header 5 is shown. In FIG. 1, only one configuration is designated as a representative for configurations having equivalent functions such as the heat source machine 2 and the pump 7.

The load 1 is composed of one or a plurality of devices that perform a predetermined function by utilizing the temperature of cold / hot water such as an air conditioner or a water heater. In FIG. 1, a plurality of AHUs (Air Handling Units) are illustrated as the load 1. The heat source machine 2 is a heat source means for applying cold heat to the cold / hot water supplied to the load 1. In the present embodiment, a plurality of heat source machines 2 are provided as heat source means, and are connected in parallel to the load 1. As the heat source machine 2, a refrigerator or a hot water generator (cold / hot water generator, heat pump, boiler, etc.) can be applied depending on the application.

Further, a thermometer (temperature detection) that detects the temperature in each of the inlet side (upstream side when viewed from the flow of cold / hot water) and the outlet side of the heat source machine 2, the header 4, the water channel between the header 3 and the header 4, and the header 6. A device and a pipe temperature detector) 12 to 16 are provided, respectively. Further, a flow meter 17 is between the header 3 and the header 4, a bypass valve 18 and a differential pressure detector 19 are between the header 5 and the header 6, a control valve 20 is used for the return water channel 10, and a bypass valve is used for the communication pipe 11. 21 and are provided respectively.

In the above configuration, the water pumped by the pump 7 is sent to the header 5 via the heat source machine 2, is pumped by the secondary pump 8, and is supplied to the water supply channel 9 via the header 6. Then, the return water reaches the header 3 through the return water channel 10 via the load 1, is sent to the pump 7 via the header 4, and is pumped again. As described above, the cold / hot water circulates in the illustrated water channel. The number of secondary pumps 8 is controlled by the load-side flow rate from the flow meter 17, and the bypass valve 18 between the header 5 and the header 6 is based on the value (differential pressure) detected by the differential pressure detector 19. The water supply pressure is controlled to be constant.

As the configuration itself of the heat source system in the present embodiment, the existing configuration may be used as it is. Then, the control device 30 connects each of the above configurations 1 to 21 by signal lines (control signal lines, data signal lines) (not shown) to control the operation of the entire heat source system. Specifically, the cold / hot water outlet set temperature of the heat source machine 2 is set so that the temperature of the cold / hot water supplied to the load 1 (hereinafter, “water supply temperature”) matches the target water supply temperature determined by the request on the load side. In addition to controlling the water supply temperature to be set, it also controls the rotation speed of the pump 7, controls the valve opening degree of the bypass valve 21 based on the differential pressure between the header 4 and the header 5. Further, the control device 30 performs unit number control for determining the number of operating heat source machines 2 according to the state of the load 1, and step-up / down control characteristic of the present embodiment.

The control device 30 is realized by, for example, a computer, and the computer can be realized by a general-purpose hardware configuration that has existed in the past. That is, the control device 30 has a CPU, a ROM, a RAM, a hard disk drive (HDD) as a storage means, and a network interface (IF) 9 as a communication means. Further, if necessary, an input means and a display means may be provided as a user interface.

FIG. 2 is a block configuration diagram of the control device 30 according to the present embodiment. The control device 30 includes an information management unit 31, a number control unit 32, an increase / decrease stage control unit 33, an operation control unit 34, and a storage unit 35. The components not used in the description of the present embodiment are omitted from the drawings. The information management unit 31 manages the information by receiving various information including data sent from the heat source system and storing the information in the storage unit 35. The received data includes the temperature detected by each thermometer 12 to 16, particularly the water supply temperature detected by the thermometer 16 and the temperature of the cold / hot water passing through the load 1 detected by the thermometer 15 (hereinafter, "return water"). Temperature ") is included. In addition, the water supply temperature required from the load side (hereinafter, "target water supply temperature") and the return water temperature required from the load side (hereinafter, "target water supply temperature") are included.

The number control unit 32 controls the number of units to determine the number of operating units of the heat source machine 2 with reference to the data acquired by the information management unit 31. The number control performed by the number control unit 32 may be the number control that has been conventionally performed such as calorific value control and flow rate control. The calorific value control is a control method for determining the number of operating heat source machines 2 on the heat source side so that the heat generated on the heat source side exceeds the heat consumption on the load side. On the other hand, the flow rate number control is a control method for determining the number of operating heat source machines 2 on the heat source side so as to exceed the flow rate required on the load side.

The increase / decrease stage control unit 33 increases or decreases the number of operating heat source machines 2 determined by the number control unit 32 with reference to the data acquired by the information management unit 31 based on the water supply temperature and the ring water temperature. Determine the number of units. The increase / decrease stage control unit 33 includes a request degree acquisition unit 331 and an increase / decrease number setting unit 332. The requirement acquisition unit 331 is a requirement indicating the ability of the heat source machine 2 required to eliminate the difference between the water supply temperature and the target water supply temperature, and is a requirement level that continuously changes according to a change in the water supply temperature. Functions as a first acquisition means for acquiring. Furthermore, the requirement level indicating the ability of the heat source machine 2 required to eliminate the difference between the return water temperature and the target return water temperature, which changes continuously according to the change in the return water temperature, is acquired. It functions as a second acquisition means. When each requirement is acquired by the requirement acquisition unit 331, the increase / decrease number setting unit 332 functions as a setting means for setting the increase / decrease number of the heat source machine 2 based on the total value of the acquired requirements.

The operation control unit 34 corrects the number of operating heat source machines 2 determined by the number control unit 32 by the increase / decrease number set by the increase / decrease number setting unit 332, and the heat source machine 2 is corrected according to the corrected number of operating heat source machines 2. Control the operation of.

As described above, the storage unit 35 stores various information acquired by the information management unit 31. In the present embodiment, only one storage unit 35 is shown for convenience as a means of storing information, but the information may be appropriately classified and stored according to the type of information, the purpose of use, and the like. ..

Each component 31 to 34 in the control device 30 is realized by a cooperative operation of a computer forming the control device 30 and a program operated by a CPU mounted on the computer. Further, the storage unit 35 is realized by the HDD mounted on the control device 30. Alternatively, RAM or an external storage means may be used via the network.

Further, the program used in the present embodiment can be provided not only by communication means but also by storing it in a computer-readable recording medium such as a CD-ROM or a USB memory. The programs provided by the communication means and the recording medium are installed in the control device 30, and various processes are realized by sequentially executing the programs by the CPU of the control device 30.

Next, the operation of the control device 30 in the present embodiment will be described with reference to the flow chart shown in FIG. 3 regarding the increase / decrease stage control process performed by the increase / decrease stage control unit 33. The number control unit 32 executes the number control process independently of the increase / decrease stage control process described here to determine the number of operating units of the heat source machine 2.

As shown in FIG. 3, the increase / decrease stage control unit 33 repeats the following processes (steps 101 to 116) unless it is instructed to stop the control when it is started. First, the increase / decrease stage control unit 33 uses the timer for increasing the stage and the timer for decreasing the stage, respectively, and resets each timer with the start of the process (step 101).

Subsequently, when the demand degree acquisition unit 331 acquires the water supply temperature from the information management unit 31, the demand degree acquisition unit 331 acquires the demand degree based on the water supply temperature as follows (step 102).

FIG. 4 is a graph showing the relationship between the water supply temperature and the required degree in the present embodiment. FIG. 4 is a graph when the load (AHU) 1 is in the heating operation. In the case of cooling operation, the inclination is reversed as shown in FIG. The set value at the water supply temperature is typically the target water supply temperature. It will be described as assuming that the target water supply temperature is set also in this embodiment.

When focusing only on the water supply temperature, if the water supply temperature matches the target water supply temperature, there is no difference between the water supply temperature and the target water supply temperature. It is not necessary to increase or decrease the number of heat source machines 2 in operation. That is, it is not necessary to increase or decrease the number of heat source machines 2 in operation, and the degree of demand in this case is set to 0. In FIG. 4, the degree of requirement corresponding to the set value of the water supply temperature is 0, and FIG. 4 shows this.

Here, if the water supply temperature measured by the thermometer 16 (hereinafter, “measured water supply temperature”) is higher than the set value, the number of heat source machines 2 in operation is reduced in the heating operation to reduce the heat generation capacity of the entire heat source machine 2 (hereinafter, “measured water supply temperature”). It is preferable to lower the water supply temperature by suppressing the amount of heat) and control the water supply temperature so that the measured water supply temperature approaches the set value (target water supply temperature). Therefore, when the actually measured water supply temperature becomes a value (T1) larger than the set value in FIG. 4, the required degree becomes a negative value (R1) smaller than 0, which means that the number of operating heat source machines 2 is to be reduced.

On the contrary, when the actual water supply temperature measured by the thermometer 16 is lower than the set value, in the heating operation, the heat generation capacity of the entire heat source machine 2 is improved by increasing the number of operating heat source machines 2 to raise the water supply temperature, and the actual measurement is performed. It is preferable to control the water supply temperature so that the water supply temperature approaches the set value (target water supply temperature). Therefore, when the measured water supply temperature becomes a value (T2) smaller than the set value in FIG. 4, the required degree becomes a positive value (R2) larger than 0, which means that the number of operating units is desired to be increased.

Here, what is characteristic of this embodiment is that the capacity required for the heat source machine 2 is not expressed by the number of heat source machines 2 such as ± 1 and ± 2, but is expressed by an index called the degree of requirement. That's what I did. Of course, in the end, the number of heat source machines 2 indicates the number of stages of increase / decrease (synonymous with the number of units of increase / decrease), but the degree of requirement is used in the process of obtaining the final number of stages of increase / decrease. Therefore, in the present embodiment, as shown in FIG. 4, it is possible to obtain a requirement that continuously changes according to a change in the water supply temperature. As shown in the vicinity of the upper and lower limits (± 300%) in FIG. 4, a portion where the degree of requirement does not change may be provided.

The relationship between the water supply temperature and the required degree may be such that the required degree continuously changes according to the change in the water supply temperature. In this embodiment, the degree of requirement is an integer. In FIG. 4, the case where the water supply temperature and the required degree are in a proportional relationship (negative proportional relationship in FIG. 4) has been described as an example, but since the required degree may be gradually reduced as the water supply temperature rises, FIG. As illustrated in the above, the change may be curved rather than linear (monotonic decrease). Alternatively, if the number of steps is large, the number of steps may be changed in a stepped manner.

In the present embodiment, when the demand level is ± 100%, one heat source machine 2 increase / decrease stage is requested, and when the demand level is ± 200%, two heat source machine 2 increase / decrease stages are requested. Is assumed. Therefore, in FIG. 4, since the case where the required degree can be taken is ± 300%, it is a graph that can correspond to the case where the maximum number of stages of increase / decrease is ± 3, but the possible range of the required degree is , It may be set appropriately according to the number of installed heat source machines 2. The same applies to the relationship between the return water temperature and the degree of requirement described below.

Subsequently, when the demand degree acquisition unit 331 acquires the return water temperature from the information management unit 31, the demand degree acquisition unit 331 acquires the demand degree based on the return water temperature as follows (step 103).

FIG. 5 is a graph showing the relationship between the return water temperature and the required degree in the present embodiment. FIG. 5 is a graph when the load (AHU) 1 is in the heating operation. In the case of cooling operation, the inclination is reversed as shown in FIG. The set value at the return water temperature is typically the target return water temperature. It is assumed that the target return water temperature is set also in this embodiment.

When focusing only on the return water temperature, if the return water temperature matches the target return water temperature, there is no difference between the return water temperature and the target return water temperature. It is not necessary to increase or decrease the number of operating heat source machines 2 determined by control. That is, it is not necessary to increase or decrease the number of heat source machines 2 in operation, and the degree of demand in this case is set to 0. In FIG. 5, the degree of requirement corresponding to the set value of the return water temperature is 0, which is shown in FIG.

Here, if the return water temperature measured by the thermometer 15 (hereinafter, “measured return water temperature”) is higher than the set value, it is determined that the cause is that the flow rate supplied to the load 1 is insufficient in the heating operation. .. That is, by increasing the number of operating heat source machines 2, the discharge capacity of cold and hot water in the entire heat source machine 2 is improved, the flow rate supplied to the load 1 is increased, and the measured return water temperature approaches the set value (target return water temperature). It is preferable to control the return water temperature. Therefore, when the measured return water temperature becomes a value (T3) larger than the set value in FIG. 5, the required degree becomes a positive value (R3) larger than 0, which means that the number of operating units is desired to be increased.

On the contrary, when the actual return water temperature measured by the thermometer 15 is lower than the set value, it is determined that the cause is that the flow rate supplied to the load 1 is excessive in the heating operation. That is, the number of operating heat source machines 2 is reduced to reduce the discharge capacity of cold and hot water in the entire heat source machine 2 to reduce the flow rate supplied to the load 1 so that the measured return water temperature approaches the set value (target return water temperature). It is preferable to control the return water temperature. Therefore, when the measured return water temperature becomes a value smaller than the set value (T4) in FIG. 5, the required degree becomes a negative value (R4) smaller than 0, which means that the number of operating units is to be reduced.

Regarding the relationship between the ring water temperature and the required degree, the relationship between the return water temperature and the required degree is required according to the change in the returned water temperature, similar to the relationship between the water supply temperature and the required degree explained with reference to FIG. The relationship may be such that the degree changes continuously. In FIG. 5, the case where the return water temperature and the required degree are in a proportional relationship (positive proportional relationship in FIG. 5) has been described as an example, but the required degree may be gradually increased as the returned water temperature rises. As illustrated in FIG. 5, the change may be curved rather than linear (monotonic increase). Alternatively, if the number of steps is large, the number of steps may be changed in a stepped manner.

The demand degree acquisition unit 331 acquires the demand degree from each of the water supply temperature and the return water temperature as described above, and the information showing the relationship between the water supply temperature (return water temperature) and the demand degree shown in FIG. 4 (FIG. 5). May be held inside the increase / decrease stage control unit 33 or the control device 30, or may be configured to refer to information outside the control device 30 when necessary. Further, in the present embodiment, the required degree based on the water supply temperature is acquired first, but the required degree based on the return water temperature may be acquired first.

When each requirement is acquired by the requirement acquisition unit 331 as described above, the increase / decrease stage control unit 33 calculates the total value of each requirement (hereinafter, “total requirement”) (step 104). , The total demand is temporarily retained (step 105).

By the way, in steps 102 and 103, if the number of stages of increase / decrease of the heat source machine 2 (the number of heat source machines 2 of ± 1 and ± 2) is obtained instead of the above-mentioned requirements for the water supply temperature and the ring water temperature, respectively. do. For example, the calculated value of the number of stages of increase / decrease of the heat source machine 2 based on the water supply temperature is between 0 and 1 unit, but if it is distributed to 0 or 1 unit, it is assumed that an increase of 1 unit is obtained. Further, it is assumed that the number of stages of increase / decrease of the heat source machine 2 based on the ring water temperature is between 0 and 1 unit, but if it is distributed to 0 or 1 unit, an increase of 1 unit is obtained. That is, the number of increment / decrement stages obtained based on each of the water supply temperature and the ring water temperature is increased by 2 units of the heat source unit 2 by adding up the increasing number of units. However, if it is between 0 and 1 in each case, it is preferable to add up the number of stages of increase / decrease based on the water supply temperature and the number of stages of increase / decrease based on the ring water temperature and count it as 1 unit. In the present embodiment, in consideration of such a case, the total value (total requirement) of the requirement based on the water supply temperature and the requirement based on the ring water temperature is obtained. As a result, it is possible to avoid an excessive increase or decrease in the heat source machine 2, so that hunting can be prevented.

When the total requirement is positive, it means that the number of heat source machines 2 is increased, that is, the number of operating heat source machines 2 is increased. On the other hand, when the total requirement is negative, it means that the number of heat source machines 2 is reduced, that is, the number of operating heat source machines 2 is reduced. By summing each requirement, even if the requirement due to the water supply temperature is positive, the requirement due to the return water temperature is negative, so that the total value may be negative.

Here, when the total demand is positive (Y in step 106), the increase / decrease stage control unit 33 refers to the total demand immediately before being temporarily held in step 105, and the total demand immediately before is positive. That is, it is confirmed whether or not the step has been increased immediately before. Here, when the total demand immediately before does not indicate the step increase (N in step 107), the time counting by the step increase timer is started (step 108). Then, assuming that the step reduction is indicated immediately before, the time counting by the step reduction timer is stopped and reset to 0 (step 109). On the other hand, when the total demand immediately before indicates an increase in stage (Y in step 107), the increase / decrease stage control unit 33 confirms whether or not the stage increase timer has reached a predetermined time, for example, 10 minutes. If the predetermined time has not elapsed (N in step 110), the process returns to step 102. The fact that the predetermined time has been reached means that the processes of steps 102 to 106, 107 and 110 have been repeatedly executed for a predetermined time.

If the total requirement is not positive (N in step 106), in this case the total requirement is either negative or 0, but if it is 0 (N in step 111), the increase / decrease stage control unit 33 is a heat source machine. The process returns to step 101 assuming that the step of increasing / decreasing the number of operating units in 2 is not required. In this case, the operation control unit 34 controls the operation of the heat source machine 2 according to the number of operations determined by the number control unit 32. When the total demand is negative (Y in step 111), the increase / decrease stage control unit 33 processes in the same manner as when the total demand is positive. That is, the increase / decrease stage control unit 33 refers to the total demand level immediately before being temporarily held in step 105, and confirms whether the total demand level immediately before is negative, that is, whether or not the stage is also reduced immediately before. If the previous total requirement does not indicate step reduction (N in step 112), the time counting by the step reduction timer is started (step 113). Then, assuming that the stage increase is indicated immediately before, the time counting by the stage increase timer is stopped and reset to 0 (step 114). On the other hand, when the total demand immediately before indicates a step reduction (Y in step 112), the step reduction timer 33 confirms whether or not the step reduction timer has reached a predetermined time, for example, 10 minutes. If the predetermined time has not elapsed (N in step 110), the process returns to step 102. When the total requirement is negative, the fact that the predetermined time is reached means that the processes of steps 102 to 106, 111, 112, and 110 are repeatedly executed for the predetermined time.

In the present embodiment, even if the total required degree indicates an increase or decrease as described above, the number of operating heat source machines 2 is not immediately increased or decreased, and is continued for a predetermined time (for example, 10 minutes). When the stage is increased or decreased, the stage is increased or decreased. As a result, hunting can be prevented.

When the total required degree continues to increase or decrease for a predetermined time (Y in step 110), the increase / decrease number setting unit 332 sets the increase / decrease number of the heat source machine 2 based on the total required degree as follows (step). 115).

FIG. 6 is a graph showing the number increase / decrease information showing the relationship between the total required degree and the increase / decrease number of the heat source machines 2 to be operated in the present embodiment. The number increase / decrease information shown in FIG. 6 may be held inside the increase / decrease number setting unit 332 or the control device 30, or may be configured to refer to information outside the control device 30 when necessary. In the graph shown in FIG. 6, the horizontal axis represents the total demand, and the vertical axis represents the increase / decrease in the number of units. The increase / decrease number setting unit 332 acquires the increase / decrease number corresponding to the total request degree by referring to the relationship between the total request degree and the increase / decrease number shown in FIG. For example, when the total demand is in the range of -50 to +50, the increase / decrease number setting unit 332 sets the increase / decrease number to 0. When the total demand is in the range of -51 to -75, the increase / decrease number setting unit 332 sets the increase / decrease number to -1. This means that one heat source machine 2 in operation is stopped. When the total demand is in the range of +51 to +75, the increase / decrease number setting unit 332 sets the increase / decrease number to +1. This means that one of the stopped heat source machines 2 is started and the operation is started. Then, when the total demand level is −76 or less, the increase / decrease number is set to -2, and when the total request level is +76 or more, the increase / decrease number is set to +2. In FIG. 6, the number of units that can be increased or decreased is ± 2, but this is just an example, and information on the increase or decrease of the number of units may be prepared according to the actual number of installed heat source machines 2.

In the present embodiment, an example in which ± 51 and ± 76 are set as the threshold values of the total demand for switching the number of units to be increased or decreased is shown, but this numerical value is not limited to this as an example. However, in the present embodiment, instead of keeping the threshold width constant as illustrated in FIG. 6, hunting is prevented by relatively increasing the width at which the number of units increased or decreased to 0, and the degree of demand is increased. The threshold width is set to decrease as the distance from 0 increases.

In the present embodiment, the total requirement used for setting the increase / decrease number of the heat source machine 2 is the latest value, that is, the total requirement when a predetermined time elapses after the total requirement becomes positive or negative. bottom. However, the present invention is not limited to this, and for example, the average value, the median value, the maximum value, or the like of the total requiredness temporarily held within a predetermined time may be used.

Further, in the present embodiment, when a predetermined time (10 minutes in the above example) has elapsed, the number of units to be increased or decreased after the heat source machine 2 is obtained. However, for example, when the total requirement indicating a plus has transitioned to converge to 0, there is a possibility that the number of operating heat source machines 2 does not need to be increased with the passage of further time. In the present embodiment, a predetermined time is set to observe the transition of the total demand, but the number of operating units of the heat source machine 2 is referred to not only with the passage of time but also with the transition of the total demand. You may decide whether to increase or decrease.

When the increase / decrease number setting unit 332 sets the increase / decrease number of the heat source machine 2 as described above, the operation control unit 34 sets the operation number of the heat source machine 2 determined by the number control unit 32 by the increase / decrease number setting unit 332. This is corrected by increasing or decreasing the number of heat source machines 2 (step 116). Then, the operation control unit 34 controls the operation of the heat source machine 2 according to the number of operating heat source machines 2 after the correction. Since the operation control of the heat source machine 2 may be performed by the same method as before, the description thereof will be omitted.

As described above, in the present embodiment, the requirement (total requirement) for the heat source machine 2 is calculated based on the difference between the measured water supply temperature and the target water supply temperature and the difference between the measured return water temperature and the target return water temperature. Then, the number of heat source machines 2 to be increased or decreased is calculated according to the degree of demand. In this way, instead of directly obtaining the increase / decrease in the number of heat source machines 2 from the difference between the measured value and the target value, the heat source machine 2 is obtained from the total requirement of the requirement based on the water supply temperature and the requirement based on the return water temperature. Since the increase / decrease in the number of units of the heat source unit 2 is obtained, it is possible to suppress an excessive increase / decrease in the number of operating heat source machines 2, and thereby the hunting prevention effect can be improved.

By the way, in the above description, the increase / decrease stage control unit 33 is made to always execute the increase / decrease stage processing, and the increase / decrease number for correcting the operating number of the heat source machine 2 determined by the number control unit 32 can be set. However, the correction may be made only when a predetermined condition is met. A plurality of conditions may be included as predetermined conditions. For example, as a predetermined condition, a state in which the flow rate of the cold / hot water (returned water) that has passed through the load 1 becomes equal to or higher than a predetermined threshold value may be included for a predetermined time. The fact that the flow rate of the return water is small means that the number of load (AHU) 1 during operation is relatively small, such as one. In this case, it is not efficient to execute the increase / decrease stage control. In this case, the threshold value is set to a value at which it can be determined that the flow rate of the return water is small for the load 1 during operation.

Further, as a predetermined condition, it may be included that at least one secondary pump 8 is operating. When the secondary pump 8 is not operating, the flow rate of the water supply to the load 1 is small. A small flow rate of water supply means that the number of loads 1 (AHU) during operation is relatively small, such as one.

Whether or not the above-mentioned predetermined conditions are satisfied may be determined at the start of the increase / decrease stage processing, for example, immediately before step 102, or immediately before step 115 for obtaining the increase / decrease number of units. In addition, the increase / decrease number is set when the predetermined condition is satisfied, but once the increase / decrease number is set, the increase / decrease number is set immediately when the predetermined condition is not satisfied. Instead of stopping, the setting of the increase / decrease number may be stopped when it is not established continuously for a predetermined time.

1 load, 2 heat source machine, 3, 4, 5, 6 header, 7 pump, 8 secondary pump, 9 water supply channel, 10 return channel, 11 communication pipe, 12, 13, 14, 15, 16 thermometer, 17 flow rate Total, 18, 21 Bypass valve, 19 Differential pressure detector, 20 Control valve, 30 Control device, 31 Information management unit, 32 Unit control unit, 33 Increase / decrease stage control unit, 34 Operation control unit, 35 Storage unit, 331 Requirement Acquisition unit, 332 increase / decrease number setting unit.

Claims (7)

A number control means for controlling the number of heat source machines that supply cold / hot water to the load according to the load condition, and a number control means for controlling the number of operating heat source machines.
It is a requirement indicating the capacity of the heat source machine required to eliminate the difference between the water supply temperature of the cold / hot water supplied to the load and the target water supply temperature, and continuously changes according to the change in the water supply temperature. The first acquisition means to acquire the degree of requirement and
It is a requirement indicating the ability of the heat source machine required to eliminate the difference between the return water temperature of the cold / hot water that has passed the load and the target return water temperature, and is continuously corresponding to the change of the return water temperature. A second acquisition method for acquiring changing demands,
When the required degree is acquired by each of the acquired means, the setting means for setting the increase / decrease number of the heat source machines based on the total value of the acquired required degree, and the setting means.
An operation control means that corrects the operating number of the heat source machine determined by the number control means by the increase / decrease number set by the setting means, and controls the operation of the heat source machine according to the corrected operating number of the heat source machine. When,
A unit control device characterized by having. The setting means increases or decreases the number of heat source machines corresponding to the total value of the requirements acquired by each acquisition means based on the number increase / decrease information in which the relationship between the degree of demand for the heat source machine and the number of increase / decrease units of the heat source unit is set. The number control device according to claim 1, wherein the number of units is set. The number control device according to claim 1, wherein the setting means sets an increase / decrease in the number of heat source machines when a predetermined condition is satisfied. The number control device according to claim 3, wherein the predetermined condition includes a state in which the flow rate of the cold / hot water passing through the load continues to be equal to or higher than a predetermined threshold value for a predetermined time. The number control device according to claim 3 or 4, wherein the setting means stops setting the number of heat source machines to be increased or decreased when the state of not satisfying the predetermined condition continues for a predetermined time. The operation control means is characterized in that the number of the heat source machines determined by the number control means is not corrected until it is continuously set for a predetermined time to increase or decrease the heat source machines operated by the setting means. The number control device according to claim 1. Computer,
A number control means for controlling the number of heat source machines that supply cold / hot water to the load according to the load condition.
It is a requirement indicating the capacity of the heat source machine required to eliminate the difference between the water supply temperature of the cold / hot water supplied to the load and the target water supply temperature, and continuously changes according to the change in the water supply temperature. The first acquisition means to acquire the degree of requirement,
It is a requirement indicating the ability of the heat source machine required to eliminate the difference between the return water temperature of the cold / hot water that has passed the load and the target return water temperature, and is continuously corresponding to the change of the return water temperature. Second acquisition means to acquire changing requirements,
When the required degree is acquired by each of the acquired means, the setting means for setting the increase / decrease number of the heat source machines based on the total value of the acquired required degree,
An operation control means that corrects the operating number of the heat source machine determined by the number control means by the increase / decrease number set by the setting means, and controls the operation of the heat source machine according to the corrected operating number of the heat source machine. ,
A program to function as.

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