JP2022149055A - Control device, control method, and program for heat source machine in air conditioning system - Google Patents

Abstract

To save energy for an overall air conditioning system by suppressing wasteful energy consumption of a heat source machine in a reasonable range in consideration of an operation state.SOLUTION: There is provided a control device for a heat source machine of an air conditioning system that has achieved energy saving for an overall air conditioning system by: providing a controller that can change settings of a design outlet temperature Tso of a heat source machine; discriminating whether the controller is in an intermediate period or in a peak period, and obtaining, by calculation, an output temperature of the heat source machine at the time of cooling on the basis of an air conditioning load of an air conditioner in a heat source machine controllable range in the intermediate period; determining whether or not the output temperature of the heat source machine obtained by calculation at the time of cooling is higher than the design outlet temperature Tso by 1°C or more; and automatically changing the output temperature of the heat source machine to the output temperature obtained by calculation when the output temperature obtained by calculation is higher than the design outlet temperature Tso by 1°C or more, and keeping the output temperature of the heat source machine at the design outlet temperature Tso when it is lower than the design output temperature Tso.SELECTED DRAWING: Figure 13

Description

The present invention provides a control device, control method, and program for a heat source device in an air conditioning system that controls a heat source device (primary side) that adjusts the temperature of fluid circulated in an air conditioner (secondary side) used in an office building, for example. It is about.

2. Description of the Related Art Conventionally, examples of adopting a modular heat pump chiller (hereinafter referred to as a "chiller") as a heat source for an air conditioning system in an office building or the like are increasing. A modular heat pump chiller is one in which the number of modularized heat pump chillers can be increased or decreased according to the air conditioning load of the air conditioning system.

First, the chiller (primary side) is provided with a chiller manufacturer's controller (hereinafter referred to as "standard controller") that controls the air conditioner (secondary side). All chiller operation control can be realized with a standard controller, making it easy to introduce. This is thought to be because there are merits such as the ease of operation because there is no need to manage the quality of the cooling water to be circulated.

JP 2013-40705 A

By the way, in the above-mentioned conventional chiller, with the standard controller, the outlet temperature of the chiller for cold and hot water is usually a fixed value corresponding to the peak period as a design value (for example, 7 ° C for cooling and 45 ° C for heating). The controller was used to control the chiller capacity and the number of modules. Therefore, unless a person manually changes the outlet temperature of the chiller, the temperature does not change throughout the year, and waste is generated especially during intermediate periods or when the load is low. This applies not only to chillers, but also to other heat source equipment such as centrifugal chillers and absorption cold/hot water generators.

In addition, when the outlet temperature of the heat source equipment is fixed (generally, 7°C during cooling and 45°C during heating), the air conditioning load heat amount on the air conditioner side is calculated, and the load heat ratio and the set temperature are calculated. An air conditioning system has been proposed that automatically controls the temperature from 5°C to 15°C during cooling and from 35°C to 55°C during heating based on a cold/hot water set temperature specification table, thereby saving energy (Patent Document 1. ).

However, the air conditioning system of Patent Document 1 is supposed to automatically output the outlet set temperature of the heat source equipment as 5 to 15 ° C during cooling (35 to 55 ° C during heating), but in the heat supply business etc. It is not possible to respond flexibly when the upper limit (lower limit) fluctuates in heat source equipment with restrictions such as the need to maintain the cold water (hot water) temperature at a constant value (temperature compensation), and relatively air conditioning during peak season When the load is high, the design value of cold water (hot water) may be exceeded, causing excessive operation of the heat source equipment, increasing the load on the equipment and increasing the energy. In addition, in the above Patent Document 1, it is assumed that changing the outlet temperature setting of the heat source unit has no effect due to the increase in the flow rate on the secondary side, but the configuration, operation method, or Depending on the control method on the secondary side, the flow rate on the secondary side (air conditioner) will increase, and the transfer power will increase, resulting in energy savings for the entire air conditioning system including the secondary side (air conditioner, secondary pump, etc.). There is a possibility that it will not. Issues such as the lack of consideration of countermeasures for these problems can be seen.

In an air conditioning system, the present invention acquires the cold/hot water inlet/outlet temperature and flow rate on the air conditioner side (secondary side), considers the situation on the secondary side, and adjusts the cold/hot water outlet temperature of the standard controller to the peak period, intermediate Basically, based on the design value, depending on the season, the cold and hot water outlet temperature is controlled to the optimum without overdoing it, eliminating waste and saving energy not only for the heat source equipment (primary side) but also for the entire air conditioning system. It is an object of the present invention to provide a control device, a control method, and a program for a heat source machine of an air conditioning system.

In the following, the cooling time is described first, and the heating time is described in parentheses.
In order to achieve the above object, the present invention
First, the cold water (hot water) from the heat source equipment on the primary side is circulated to the air conditioner on the secondary side through the outgoing pipe and the return pipe, and the air introduced by the air conditioner and the cold water (hot water) exchange heat. Accordingly, in a control device for a heat source machine of an air conditioning system that cools (heats) indoor air by the air conditioner, a controller capable of changing the setting of the design outlet temperature Tso of the heat source machine is provided, and the controller is , an intermediate season/peak period discriminating means capable of determining whether it is an intermediate season or a peak season; The temperature difference between the outlet temperature set at the previous time of the cycle pTs and the measured secondary side return temperature Tr2 of the cold water (hot water) in the return pipe, and the measured temperature of the cold water (hot water) circulating in the going pipe and the return pipe. A heat quantity calculation means that can be calculated from the product of the flow rate F, and whether or not the current required heat quantity qr of the air conditioner calculated by the heat quantity calculation means is within the range of the rated capacity of the heat source equipment. When the required heat amount qr of the air conditioner is determined to be within the range of the rated capacity of the heat source equipment by the discriminable heat amount determination means and the heat amount determination means, the design return temperature is set to Tro. When the temperature Tro is set to a temperature 5° C. to 7° C. higher (5° C. to 7° C. lower) than the design outlet temperature Tso, and the measured flow rate is F,
Chilled water outlet temperature during cooling Ts=Tro-(qr/F)
(Hot water outlet temperature during heating Ts = Tro + (qr/F))
Outlet temperature calculation means for obtaining the cold water outlet temperature (hot water outlet temperature) Ts by the calculation of the above equation, and it is possible to determine whether the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso and the outlet temperature comparison means, only when the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso by 1 ° C. or more, the design outlet temperature of the heat source machine By comparison between the setting changing means capable of changing the setting of Tso to the cold water (hot water) outlet temperature Ts obtained by the outlet temperature calculating means and the outlet temperature comparing means, the cold water (hot water) outlet temperature Ts is determined to be the design outlet temperature. and a setting maintaining means capable of maintaining the design outlet temperature Tso of the heat source equipment when it is equal to or lower than Tso (equal or higher), and the above operation is repeated for each control cycle. It consists of a control device for a heat source in an air conditioning system.

The controller is the controller (17) according to the invention. Judgment by the interim period/peak period judging means is made based on either a seasonal aspect or a case where the air conditioning load of the air conditioner is less than 80% of the rated capacity of the heat source equipment. The control cycle is, for example, every 30 minutes. The previous time set outlet temperature pTs is, for example, the outlet temperature of the heat source machine set at the previous time, and is initially the design outlet temperature Tso of 7 [°C] (45 [°C] during heating), and after the control cycle, It is the outlet temperature Ts of the heat source machine obtained by the outlet temperature calculating means at the previous time (for example, 30 minutes ago). The designed outlet temperature Tso of the heat source equipment is, for example, 7[°C] during cooling and 45[°C] during heating, for example. As the flow rate F of the going pipe and the return pipe, the flow rate on the secondary side is selected when the valve of the air conditioner is a two-way valve, and the flow rate on the primary side is selected when the valve of the air conditioner is a three-way valve. With this configuration, when it is determined that the required heat quantity of the air conditioner can be controlled by the heat source equipment in the interim period, the outlet temperature of the heat source equipment is set to a value higher than the design outlet temperature Tso by 1°C or more during cooling (heating At times, the setting can be changed to a value lower than the design outlet temperature Tso by 1° C. or more, so energy saving can be realized for the air conditioning system as a whole.

Secondly, in a control device for a heat source device of a two-pump type air conditioning system having a primary side pump in the heat source device and a secondary side pump on the going piping side, the intermediate season/peak season discrimination means discriminates In the interim period, the controller detects the measured cold water (hot water) primary side flow rate F1 on the heat source machine side and secondary side flow rate F2 on the air conditioner side measured in the preceding stage of the heat quantity calculation means. , when the secondary flow rate F2 is greater than the primary flow rate F1 by comparison between the flow rate comparison means capable of determining whether the secondary flow rate F2 is greater than the primary flow rate F1 and the flow rate comparison means; Secondly, a secondary side flow rate increase rate calculation means capable of calculating the rate of increase of the secondary side flow rate, and the increase rate of the secondary side flow rate F2 calculated by the secondary side flow rate increase rate calculation means. is higher than a preset reference value, and if the increase rate of the secondary flow rate F2 is higher than the reference value by the comparison of the increase rate comparison means, The increase rate comparison means gives a command to the setting maintenance means to maintain the design outlet temperature Tso of the heat source equipment, and the increase rate of the secondary flow rate F2 is determined by the comparison of the increase rate comparison means. Only when the temperature is lower than the reference value, the increase rate comparison means gives a command to the heat source calculation means to perform normal control, and the cold water (hot water) is compared by the outlet temperature comparison means. ) Only when the outlet temperature Ts is higher (lower) than the design outlet temperature Tso, the setting change means changes the cold water (hot water) outlet temperature Ts obtained by the outlet temperature calculation means from the design outlet temperature Tso of the heat source equipment. It is configured by the control device for the heat source machine of the air conditioning system according to the first description, which is configured to change the setting to .

In the case of the two-pump system, it is expected that the flow rate on the air conditioner side (secondary side) will increase. Therefore, the increase rate of the secondary flow rate is obtained by calculation, and the increase rate is compared with the reference value (for example, 110%). Only when the temperature Tso remains unchanged and the rate of increase is below the reference value, the outlet temperature of the heat source unit can be raised (or lowered during heating) from the design outlet temperature Tso, so no unnecessary operations are performed. can improve the efficiency of the air conditioning system.

Third, the cold water (hot water) from the heat source equipment on the primary side is circulated to the air conditioner on the secondary side through the outgoing pipe and the return pipe, and the air introduced by the air conditioner and the cold water (hot water) exchange heat. Accordingly, in a control device for a heat source machine of an air conditioning system that cools (heats) indoor air by the air conditioner, a controller capable of changing the setting of the design outlet temperature Tso of the heat source machine is provided, and the controller is , an intermediate/peak period determining means capable of determining whether it is an intermediate period or a peak period; The product of the temperature difference between the outlet temperature Tso, the measured secondary side return temperature Tr2 of the cold water (hot water) in the return pipe, and the measured flow rate F of the cold water (hot water) circulating in the outgoing pipe and the return pipe. and a heat quantity determination capable of determining whether or not the current required heat quantity qr of the air conditioner calculated by the heat quantity calculation means is within the range of the rated capacity of the heat source equipment. means and the heat quantity determination means, when the required heat quantity qr of the air conditioner is determined to be within the range of the rated capacity of the heat source equipment, the outlet temperature of cold water (hot water) of the heat source equipment is Outlet temperature changing means for instructing a change to the changed cold water (hot water) outlet temperature higher (lower) than the design outlet temperature Tso by 3° C. or more; Setting changing means for changing the outlet temperature to the changed cold water (hot water) outlet temperature, fixed time discriminating means for discriminating whether or not a predetermined time has elapsed, When it is judged that the time has come, the cold water (hot water) outlet temperature after the change is lowered (raised) by the specified temperature range, and the cold water (hot water) outlet temperature of the heat source unit is changed to the cold water after the change in the setting change means. (hot water) outlet temperature increasing/decreasing means for instructing a change to the outlet temperature; The operation of decreasing (increasing) the temperature within the specified temperature range is repeatedly performed, and the temperature of the cold water (hot water) outlet of the heat source device is changed by the setting change means every time the predetermined time is reached. , the same operation is repeated until the outlet temperature of the cold water (hot water) after the change of the thermoelectric machine matches the design outlet temperature Tso of the heat source equipment. Configured by machine controller be done.

The controller is the controller (17) according to the invention. Judgment by the interim period/peak period judging means is made based on either a seasonal aspect or a case where the air conditioning load of the air conditioner is 80% or more of the rated capacity of the heat source equipment. The cold water (hot water) outlet temperature after change that is 3°C higher (lower) than the design outlet temperature Tso is, for example, 11°C (during heating) that is 4°C higher than the design outlet temperature Tso = 7°C (45°C during heating). is set to 41°C). The predetermined time of the constant time determining means is, for example, 10 minutes. The specified temperature range is, for example, 1°C, and in the case of cooling, it decreases by 1°C from 11°C every 10 minutes until the outlet temperature of the heat source unit matches the design outlet temperature (Tso = 7°C) (during heating). is raised from 41° C. by 1° C., and the same operation is repeated until the outlet temperature of the heat source unit matches the design outlet temperature (Tso=45° C.). As a result, in the peak period, the energy saving of the air conditioning system as a whole can be achieved reasonably.

Fourth, the cold water (hot water) from the heat source equipment on the primary side is circulated to the air conditioner on the secondary side through the outgoing pipe and the return pipe, and heat is exchanged between the air introduced by the air conditioner and the cold water (hot water). By doing so, in a method for controlling a heat source device of an air conditioning system in which the air conditioner cools (heats) indoor air, a controller capable of changing the setting of the design outlet temperature Ts of the heat source device is provided, and the controller In the interim period determined by the interim/peak period discriminating means capable of determining whether it is the peak period or the peak period, the heat quantity calculation means converts the required heat quantity qr of the air conditioner to the outlet temperature set at the previous time of the control cycle of the heat source equipment. Calculated from the product of pTs, the measured temperature difference between the secondary side return temperature Tr2 of the cold water (hot water) in the return pipe, and the measured flow rate F of the cold water (hot water) circulating in the outgoing pipe and the return pipe. Then, the heat quantity determination means determines whether the current required heat quantity qr of the air conditioner calculated by the heat quantity calculation means is within the range of the rated capacity of the heat source equipment, and the heat quantity determination means When it is determined that the required heat amount qr of the air conditioner is within the range of the rated capacity of the heat source equipment, the outlet temperature calculation means sets the design return temperature Tro as the design return temperature Tro to the design outlet temperature When the temperature is set to 5°C to 7°C higher than Tso (5°C to 7°C lower) and the measured flow rate is F,
Chilled water outlet temperature during cooling Ts=Tro-(qr/F)
(Hot water outlet temperature during heating Ts = Tro + (qr/F))
The cold water outlet temperature (hot water outlet temperature) Ts is calculated by the above formula, and the outlet temperature comparing means determines whether or not the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso. , the setting changing means adjusts the design outlet temperature Tso of the heat source machine only when the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso by 1° C. or more according to the comparison by the outlet temperature comparing means. is set to the cold water (hot water) outlet temperature Ts obtained by the outlet temperature calculation means, and the setting maintenance means compares the cold water (hot water) outlet temperature Ts with the design outlet temperature Tso by comparing the outlet temperature comparison means. If it is equal or lower (equal or higher), the design outlet temperature Tso of the heat source machine is maintained, and the above operation is repeated in each control cycle.

Fifth, in the control method of the heat source equipment of a two-pump type air conditioning system having a primary side pump in the heat source equipment and a secondary side pump on the going piping side, the interim/peak period discriminating means discriminates In the interim period, the controller determines that the flow rate comparison means, in the preceding stage of the heat quantity calculation means, compares the measured cold water (hot water) flow rate F1 on the primary side of the heat source equipment and the secondary side flow rate of the air conditioner on the side of the air conditioner. The flow rate F2 is detected, it is determined whether or not the secondary flow rate F2 is greater than the primary flow rate F1, and if the secondary flow rate F2 is greater than the primary flow rate F1 based on the comparison by the flow rate comparison means Secondly, the secondary side flow rate increase rate calculation means obtains the rate of increase in the secondary side flow rate by calculation, and the rate of increase comparison means calculates the secondary side flow rate F2 calculated by the secondary side flow rate increase rate calculation means. It is determined whether or not the rate of increase is higher than a preset reference value, and if the rate of increase of the secondary-side flow rate F2 is higher than the reference value as a result of comparison by the rate-of-increase comparison means, the rate-of-increase comparison means gives a command to the setting maintaining means to maintain the design outlet temperature Tso of the heat source equipment, and the increase rate of the secondary flow rate F2 is lower than the reference value as compared by the increase rate comparison means only, the increase rate comparison means gives a command to the heat source calculation means to perform normal control, and the comparison by the outlet temperature comparison means confirms that the cold water (hot water) outlet temperature Ts is the above Only when it is higher (lower) than the design outlet temperature Tso, the setting change means changes the setting of the design outlet temperature Tso of the heat source equipment to the cold water (hot water) outlet temperature Ts obtained by the outlet temperature calculation means. 4. It is configured by the control method for the heat source machine of the air conditioning system described in 4 above.

Sixth, the cold water (hot water) from the heat source machine on the primary side is circulated to the air conditioner on the secondary side through the outgoing pipe and the return pipe, and heat is exchanged between the air introduced by the air conditioner and the cold water (hot water). By doing so, in a method for controlling a heat source device of an air conditioning system in which the air conditioner cools (heats) indoor air, a controller capable of changing the setting of the design outlet temperature Ts of the heat source device is provided, and the controller In the peak period determined by the intermediate/peak period determining means capable of determining whether it is the peak period or the peak period, the heat quantity calculation means measures the required heat quantity qr of the air conditioner, the design outlet temperature Tso of the heat source equipment, and the Calculated from the product of the temperature difference between the cold water (hot water) in the return pipe and the secondary return temperature Tr2 and the flow rate F of the cold water (hot water) circulating in the measured return pipe and the return pipe, and the heat quantity determination means determines whether or not the current required heat quantity qr of the air conditioner calculated by the heat quantity calculation means is within the range of the rated capacity of the heat source equipment, and the heat quantity determination means determines whether or not the air conditioner is within the range of the rated capacity of the heat source equipment, the outlet temperature changing means sets the outlet temperature of cold water (hot water) of the heat source equipment to be 3°C or higher than the design outlet temperature Tso. An instruction is given to change the cold water (hot water) outlet temperature after the change to high (low), and the setting changing means changes the cold water (hot water) outlet temperature of the heat source machine to the changed cold water according to the instruction of the outlet temperature changing means. (Hot water) outlet temperature is changed, the fixed time determination means determines whether or not the predetermined time has come, and when the fixed time determination means determines that the predetermined time has come, the outlet temperature increases or decreases. The means lowers (raises) the changed cold water (hot water) outlet temperature by a specified temperature range, and the setting changing means provides the changed cold water (hot water) outlet temperature of the cold water (hot water) outlet temperature of the heat source machine. and the outlet temperature increasing/decreasing means decreases the cold water (hot water) outlet temperature of the heat source machine within the specified temperature range ( every time the predetermined time is reached, the setting change means repeatedly changes the cold water (hot water) outlet temperature of the heat source machine, and the cold water (hot water) after the change of the thermoelectric machine is changed It is configured by a control method for a heat source machine of an air conditioning system in which the same operation as described above is repeatedly performed until the hot water outlet temperature matches the design outlet temperature Tso of the heat source machine.

Seventh, it comprises a program for causing a computer to function as a control device for the heat source machine of any one of the first to third air conditioning systems.

As described above, in the present invention, when it is determined that the required heat quantity of the air conditioner can be controlled by the heat source equipment in the intermediate period, the outlet temperature of the heat source equipment is set to a value higher than the design outlet temperature Tso by 1°C or more during cooling. (During heating, the setting can be changed to a value lower than the design outlet temperature Tso by 1° C. or more), so energy saving can be realized for the air conditioning system as a whole.

In addition, in the interim period, if the air conditioning system is a two-pump system, it is expected that the flow rate on the air conditioner side (secondary side) will increase. decreases. Therefore, the increase rate of the secondary flow rate is obtained by calculation, and the increase rate is compared with the reference value (for example, 110%). Only when the temperature Tso remains unchanged and the rate of increase is below the reference value, the outlet temperature of the heat source unit can be raised (or lowered during heating) from the design outlet temperature Tso, so no unnecessary operations are performed. can improve the efficiency of the air conditioning system.

In the peak period, in the case of cooling, the outlet temperature of the heat source unit can be changed so as to decrease by 1° C., for example, from 11° C. every predetermined time. until the outlet temperature matches the design outlet temperature Tso (7°C), a state higher than the design outlet temperature can be maintained. (Because it is possible to maintain a state lower than the design outlet temperature until the outlet temperature of the heat source machine matches the design outlet temperature Tso (45 ° C)), this allows the air conditioning system as a whole Energy can be saved.

1 is a block diagram of a control device (one-pump system, two-way valve) of a heat source machine of an air conditioning system according to the present invention; FIG. Fig. 2 is a block diagram of the same device (1-pump system, 3-way valve); FIG. 2 is a block diagram of the same device (2-pump system, 2-way valve). Fig. 2 is a block diagram of the same device (2-pump system, 3-way valve); It is a block diagram of the controller of the apparatus same as the above. Fig. 10 is a flow chart showing an operation procedure of a controller in an intermediate period during cooling of the same apparatus (1-pump system). Fig. 10 is a flow chart showing an intermediate operation procedure of a controller during cooling and heating of the same device (two-pump system). 4 is a flow chart showing the operating procedure of the controller of the same apparatus during peak season during cooling. 4 is a flow chart showing the operating procedure of the controller of the same apparatus during peak season during cooling. Fig. 4 is an intermediate functional block of the controller of the device; Fig. 4 is an intermediate functional block of the controller of the device; It is a figure which shows the data of the memory of the controller of the apparatus same as the above. Fig. 3 is a block diagram including the standard controller of the same device; 4 is a flow chart showing an operation procedure of a standard controller of the apparatus; It is a peak period functional block of the controller of the device same as the above. 4 is a flow chart showing an operation procedure of a controller in the intermediate period during heating of the same apparatus (1-pump system). 4 is a flow chart showing the operation procedure of the controller of the same device during the peak season during heating. 4 is a flow chart showing the operation procedure of the controller of the same device during the peak season during heating.

First, an air conditioning system according to the present invention will be described.
(1-pump type, 2-way valve) Pattern in FIG. 1 FIG. 1 shows a 1-pump type air conditioning system. In FIG. 1, the flow control valve (flow control valve) 5 of the air conditioner 1a is a two-way valve. A plurality of air conditioners 1a may be provided (FIG. 1 shows, for example, two air conditioners 1a). In FIG. 1, the side of the air conditioner 1a is called the "secondary side", and the side of the heat source device 4 is called the "primary side". The air conditioners in FIGS. 1 and 3 are denoted by reference numeral 1a, and the air conditioners in FIGS. 2 and 4 are denoted by reference numeral 1b.

The air conditioner 1a detects the indoor temperature with a temperature sensor (not shown) installed indoors, and preset target temperatures (26 ° C. during cooling, 22 ° C. during heating, these temperatures are maintained throughout the year The flow rate of cold water (or hot water) entering the air conditioner 1a from the incoming pipe 2 is adjusted by varying the flow rate control valve 5 so that the air conditioning (indoor temperature adjustment) is performed. Therefore, a person in the room cannot change the temperature during cooling and the temperature during heating.

For example, in the case of cooling, the air conditioner 1a has a relatively low outside temperature (relatively high during heating) in the middle season (October to June during cooling, March to November during heating). Since there is little need to cool the room (or warm it during heating), the room temperature can be maintained at 26°C (22°C during heating) even if air is blown into the room with a small flow rate of cold water (hot water). On the other hand, during the peak season (July to September for cooling, December to February for heating), the outside temperature is high (low for heating), so the indoor temperature is 26°C (22°C for heating). Therefore, it is necessary to flow a large amount of cold water (hot water) to blow air into the room.

The inlet of the air conditioner 1a (secondary side) is connected to the outgoing pipe 2 connected to the outlet of the heat source device 4 (for example, an air-cooled heat pump chiller), and the outlet of the air conditioner 1a is connected to the inlet of the heat source device 4. A return pipe 3 is connected.

The air conditioner 1a incorporates a fan and a heat exchanger (neither of which are shown), and supplies cold water (during cooling) or hot water (during heating) through an outgoing pipe 2 connected to the outlet of the heat source device 4. is received from the inlet, and the heat carried as the cold and hot water is exchanged with the indoor air sucked by the fan in the internal heat exchanger to cool the indoor air (the indoor temperature during cooling is 26 ℃ constant) or heating (indoor temperature during heating is 22 ℃ constant). The cold water or hot water flows out from a return pipe 3 connected to the outlet of the air conditioner 1a and returns to the inlet of the heat source device 4. As shown in FIG.

As shown in FIG. 1, the air conditioner 1a having the two-way flow control valve 5 has a bypass pipe 6a (see FIGS. 2 and 4) connecting the inlet side and the outlet side of the air conditioner 1a. Therefore, the flow control valve 5 is variably controlled according to fluctuations in the air conditioning load (the same applies to FIG. 3).

That is, when the air conditioning load increases, the flow control valve 5 is opened to increase the flow rate of hot and cold water entering the air conditioner 1a, and when the air conditioning load decreases, the flow control valve 5 is closed to decrease the flow rate of cold and hot water entering the air conditioner 1a. Perform variable control to allow Therefore, the flow rate on the entire secondary side changes depending on the air conditioning load (the flow rate on the secondary side increases or decreases depending on the throttling amount of the flow control valve 5). In such a device, in the control of the controller 17 (see FIG. 10) according to the present invention, in the following step P11 (during cooling, see FIG. 6), "primary variable flow rate control" is selected (during heating See step P11 in FIG. 16).

Then, as will be described later, except for the time of start-up, in steady state, cold and hot water flowing from the heat source device 4 to the air conditioner 1a through the outgoing pipe 2 (for example, the design temperature is 7 ° C. for cooling, and the design temperature is 7 ° C. for heating) temperature 45°C) is exchanged with the air sucked by the fan in the internal heat exchanger, and if it is cooling, the air in the room is cooled, and after that, the cold water that has been given heat rises to about 12°C and is air-conditioned. It flows out to the return pipe 3 from the machine 1a. In the case of heating, the internal heat exchanger exchanges heat with the air sucked in by the fan to warm the air in the room. It flows out to the return pipe 3 from the machine 1a.

The amount of heat exchanged by the air conditioner 1a is generally adjusted by the air amount of the fan and the flow rate of cold water or hot water (adjusted by the flow control valve 5).

The heat source device 4 (primary side) can be an air-cooled heat pump chiller, but here, four modular heat source devices 4a are used to which the same air-cooled heat pump chiller unit 4a can be added. This applies not only to chillers, but also to heat source equipment such as centrifugal chillers and absorption cold/hot water generators. Incidentally, the four heat source machines are collectively denoted by reference numeral 4, and the reference numeral 4a is used when referring to separate heat source machines. This heat source device (hereinafter also referred to as "chiller") 4 has a predetermined temperature (for example, when cooling, the outlet temperature is 7 ° C. (design value), and the inlet temperature varies depending on the temperature on the outlet side of the air conditioner 1a ( For example, 12 ° C.), the outlet temperature is 45 ° C. during heating, and the inlet temperature varies depending on the temperature on the outlet side of the air conditioner 1 (for example, 40 ° C.)). 1a, and the cold and hot water discharged from the air conditioner 1a flows in through the return pipe 3. Each chiller 4a is provided with a cold/hot water chiller pump 4b (each heat source unit 4a has one chiller pump 4b, total four), and the air conditioning system has a pump only on the primary side. (hereinafter referred to as "one-pump system").

Since this heat source device 4 is the primary equipment, it does not exchange information with the air conditioner 1a as the secondary equipment, and therefore does not know the status of the air conditioner 1a. Therefore, on the side of the heat source device 4, the degree of opening of the flow control valve 5 of the air conditioner 1a and the operation status of the air conditioner 1a are unknown. Therefore, a bypass pipe 8 and a bypass valve 9 are provided between the going pipe 2 and the return pipe 3 between the air conditioner 1a (secondary side) and the heat source device 4 (primary side).

For example, if the air conditioning load decreases and the flow control valve 5 of the air conditioner 1a is throttled, the pressure in the incoming pipe 2 increases. In this case, the bypass valve 9 opens due to the pressure difference between the forward pipe 2 and the return pipe 3, and part of the hot and cold water flowing out from the outlet side of the heat source device 4 passes through the bypass pipe 8 and returns to the heat source via the return pipe 3. It flows into the inlet side of the machine 4, and the pressure in the incoming pipe 2 is thereby kept constant. Further, when the air conditioning load increases and the flow control valve 5 of the air conditioner 1a is opened, the pressure in the incoming pipe 2 decreases. In this case, the bypass valve 9 is throttled by the pressure difference between the forward pipe 2 and the return pipe 3, and the flow rate of the hot and cold water flowing out from the outlet side of the heat source device 4 is throttled to the bypass pipe 8, The flow rate increases and the pressure in the incoming pipe 2 is kept constant.

In FIG. 1, 10 is a secondary side outgoing temperature sensor provided in the outgoing pipe 2, and measures the secondary side outgoing temperature Ts2 [°C]. The data of the secondary-side going temperature Ts2 can be detected by the controller 17 (FIG. 10, data acquisition means 17q) according to the present invention. 11 is a secondary side going pressure gauge, which measures the secondary side going pressure Ps [kPa]. The secondary-side going pressure Ps can be detected by the controller 17 (FIG. 10, data acquisition means 17q) according to the present invention. A primary flow rate sensor 12 measures a primary flow rate F1 [m ³ /h]. The measured value of the primary flow rate sensor 12 can be detected by the controller 17 (FIG. 10, data acquisition means 17q).

A secondary side return temperature sensor 13 is provided in the return pipe 3 and measures a secondary side return temperature Tr2 [°C]. The secondary return temperature Tr2 can be detected by the controller 17 (FIG. 10, data acquisition means 17q). A secondary flow rate sensor 14 measures a secondary flow rate F2 [m ³ /h]. The secondary flow rate F2 can be detected by the controller 17 (FIG. 10, data acquisition means 17q). A secondary side return pressure gauge 15 measures a secondary side return pressure Pr [kPa]. The secondary side return pressure Pr can be detected by the controller 17 (FIG. 10, data acquisition means 17q). A primary side return temperature sensor 16 measures a primary side return temperature Tr1 [°C]. The primary side return temperature Tr1 can be detected by the controller 17 (FIG. 10, data acquisition means 17q).

Then, the controller 17 temporarily stores the data (Ts2, Ps, F1, Tr2, F2, Pr, Tr1) acquired by the data acquisition means 17q in the data storage area 18h of the memory 18 (see FIG. 12). configured to be memorized.

The controller 17 according to the present invention (see FIGS. 1, 5 and 10, setting change means 17m) connects the input terminal 7a of the standard controller 7 (see FIG. 13) of the heat source device 4 attached to the heat source device 4 to It commands the change of the chiller outlet temperature to the chiller outlet temperature setting means 7b via.

The standard controller 7 is attached to the heat source device 4, and the operation of the manufacturer's controller 7 (hereinafter referred to as the "standard controller 7") of the heat source device 4 will be described below.

The standard controller 7 (see FIG. 13) controls the operating capacity of the air conditioner 1a ( Secondary side operating capacity) "operating capacity of air conditioner 1a = secondary flow rate F2 x (outlet temperature of air conditioner 1a (= fixed at 11°C) - inlet temperature of air conditioner 1a (for example, 7°C)" (during heating, Operating capacity of air conditioner 1a (secondary side operating capacity) "operating capacity of air conditioner 1a = secondary flow rate F2 x (inlet temperature of air conditioner 1a (=fixed at 45°C) - outlet temperature of air conditioner 1a (for example, 40°C )”) determines the number of operating heat source units 4a. When the capacity exceeds 50%, the second module type chiller 4a is controlled to operate.Then, when the maximum four module type chillers 4a are operated, the air conditioner 1a is at the maximum. All four chiller pumps 4b are operated at a preset constant flow rate.In FIGS. 1 to 4, the standard controller 7 of the chiller 4 is provided for each chiller 4a. Although the standard controller 7 is provided for the entire chiller 4 in FIG. 13, it is substantially the same. is sent, an outlet temperature change signal is sent from the standard controller 7 to each chiller 4a, the outlet temperature of each chiller 4a is changed, and as a result the outlet temperature of the outlet 4d in FIG. 13 is changed. become.

(1-pump system, 3-way valve) Pattern of FIG. 2 Next, the case where the flow control valve of the air conditioner 1b is a 3-way valve will be described (see FIG. 2). 1 is that the flow control valve (flow control valve) 6 of the air conditioner 1b is a three-way valve. to explain.

The flow regulating valve 6 is a three-way valve, one of which is connected to the incoming pipe 2, two of which are connected to the input side of the air conditioner 1b, and three of which bypass the air conditioner 1b. Then, the forward pipe 2 is connected to the bypass pipe 6a connected (connection point 6') to the return pipe 3 on the outlet side of the air conditioner 1b. When the flow rate control valve 6 is throttled according to the air conditioning load of the air conditioner 1b, the flow rate input to the air conditioner 1b from the incoming pipe 2 via the flow rate control valve 6 is reduced, but the flow rate other than the throttled flow rate is reduced. flows through the bypass pipe 6a to the return pipe 3 on the outlet side of the air conditioner 1b from the connection point 6'. Further, when the flow rate control valve 6 is opened according to the air conditioning load, the flow rate from the incoming pipe 2 through the flow rate rate control valve 6 to the air conditioner 1b increases, but the flow rate to the bypass pipe 6a decreases. .

In this way, in the case of the three-way valve, the flow rate of the forward pipe 2 upstream of the flow control valve 6 and the flow rate after the connection point 6' on the outlet side of the air conditioner 1b are always constant.

Therefore, since there is no pressure difference between the primary side piping and the secondary side piping, there is no problem even if the bypass pipe 8 and the bypass valve 9 are not provided.

The configuration of the heat source device 4 (using four modules of the same air-cooled heat pump chiller unit that can be expanded) is the same as that in FIG. 1, so description thereof will be omitted. However, the configuration of the standard controller 7 is different for the three-way flow control valve 6 than for the two-way flow control valve 5 .

That is, in the standard controller 7, the flow rate on the primary side and the secondary side is always constant, so when the air conditioning load on the secondary side is relatively high (when the air conditioning starts up), the chiller pump 4b is set at 50% of the rated capacity of the chiller pump 4b. All 4 units are in constant operation, and when the air conditioning load on the secondary side is normal (during normal load fluctuations), all 4 units are always in operation at 25% of the rated capacity of the chiller pump 4b. state.

(Two-pump system, two-way valve) Pattern in FIG. 3 FIG. 3 shows an air conditioning system of two-pump system in which the flow control valve 5 of the air conditioner 1a is a two-way valve.
In the 2-pump system, in addition to the chiller pump 4b on the primary side (chiller 4 side), a header 22 and a header 23 are provided at the boundary between the primary side and the secondary side of the going pipe 2, and between the head 22 and the header 23 , and a header 24 is provided at the boundary between the primary side and the secondary side of the return pipe 3 . A bypass pipe 8 and a bypass valve 9 are provided between the headers 22 and 24 to bypass the forward pipe 2 and the return pipe 3 .

Cold and hot water can be sent to the air conditioner 1a not only by the chiller pump 4b of the chiller 4 but also by the secondary side pump 21, which is often used in large-scale buildings. The secondary side pump 21 has a wide supply range, and is installed to ensure the flow rate of the air conditioner 1a so as not to hinder the heat supply on the secondary side (air conditioner 1a side).

As described above (see FIGS. 1 and 2), the heat source device 4 as the primary equipment does not exchange information with the air conditioner 1a as the secondary equipment. The situation of the air conditioner 1a is not grasped.

On the other hand, since the secondary pump 21 is a secondary facility, it grasps the degree of opening of the flow control valve 5 of the air conditioner 1a, and even if the air conditioning load fluctuates, the pressure in the incoming pipe 2 is kept constant. Adjust the flow rate so that (constant water pressure control). That is, the secondary-side pump 21 grasps the opening degree of the flow rate adjustment valve 5, and based on the pressure fluctuation on the secondary side due to the opening degree of the flow rate adjustment valve 5, the set pressure (the pressure at which the secondary side is constant) ). Then, the chiller pump 4b on the side of the heat source device 4 of the primary equipment adjusts the flow rate so as to match the flow rate on the secondary side.

Therefore, for example, if the air conditioning load decreases and the flow control valve 5 of the air conditioner 1a is throttled, the pressure in the incoming pipe 2 increases. In this case, the operation is performed so that the flow rate of the secondary side pump 21 is reduced and the pressure of the going pipe 2 is kept constant. At this time, the chiller pump 4b adjusts the flow rate so as to match the flow rate on the secondary side. Therefore, in the chiller pump 4b as well, the flow rate is throttled, and as a result, the pressure in the incoming pipe 2 is controlled to be constant. Further, if the air conditioning load increases and the flow control valve 5 of the air conditioner 1a is opened, the pressure in the incoming pipe 2 will drop. In this case, the operation is performed so that the flow rate of the secondary side pump 21 increases and the pressure of the going pipe 2 is kept constant. At this time, the flow rate of the chiller pump 4b also increases so as to match the flow rate of the secondary side, and as a result, the pressure of the incoming pipe 2 is controlled to be constant. (In this case, the setting of the chiller pump 4b can be changed by the standard controller so that the flow rate is variable in accordance with the flow rate on the secondary side only in this case).

Usually, it is set such that primary side flow rate≧secondary side flow rate. The flow rate of the chiller 4 (the flow rate of the chiller pump 4b) is configured to be variable according to the flow rate on the secondary side, as described above. The bypass pipe 8 is designed to flow freely so as to eliminate the imbalance between the flow rates of the air conditioner 1 (secondary side) and the chiller 4 (primary side). 2 to the return pipe 3 or from the return pipe 3 to the forward pipe 2 depends on the flow rate on the secondary side and the primary side. This does not require any particular control, and when the primary side flow rate is greater than the secondary side flow rate, the excess flows into the bypass pipe 8 .

That is, when the primary flow rate≧secondary flow rate, the increment of the primary flow rate flows from the forward piping 2 side through the bypass piping 8 into the return piping 3 side, and when the primary flow rate≦secondary flow rate, It is configured to flow from the return pipe 3 side to the going pipe 2 side through the bypass pipe 8 to eliminate the imbalance between the flow rates on the primary side and the secondary side.

In FIG. 3 (as well as in FIG. 4), reference numeral 20 denotes a temperature sensor for measuring the primary side going temperature Ts1 [° C.]. Reference numeral 25 is a regulating valve that connects the headers 22 and 23 (the same applies to FIG. 4).

(2-pump system, 3-way valve) Pattern of FIG. 4 Next, the case where the flow control valve of the air conditioner 1b is a 3-way valve will be described (see FIG. 4). The difference from FIG. 3 is that the flow control valve 6 of the air conditioner 1b is a three-way valve.

The flow control valve 6 is a three-way valve, and its structure is the same as that shown in FIG. Therefore, when the flow rate control valve 6 is throttled according to the air conditioning load of the air conditioner 1b, the flow rate input to the air conditioner 1b from the incoming pipe 2 via the flow rate control valve 6 is reduced, but the flow rate other than the throttled flow rate is reduced. flows through the bypass pipe 6a to the return pipe 3 on the outlet side of the air conditioner 1b from the connection point 6'. Further, when the flow rate control valve 6 is opened according to the air conditioning load, the flow rate from the incoming pipe 2 through the flow rate rate control valve 6 to the air conditioner 1b increases, but the flow rate to the bypass pipe 6a decreases. . In this way, in the case of the three-way valve, the flow rate of the forward pipe 2 upstream of the flow control valve 6 and the flow rate after the connection point 6' on the outlet side of the air conditioner 1b are always constant. Therefore, since there is no pressure difference between the primary side piping and the secondary side piping, there is no problem even if the bypass pipe 8 and the bypass valve 9 are not provided.

In this case, the secondary pump 21 always operates at a constant flow rate, and the chiller pump 4b operates at a constant flow rate.

The configuration of the heat source device 4 (using four modules of the same air-cooled heat pump chiller unit 4a that can be expanded) is the same as in FIG. 3, so the description thereof will be omitted. However, the configuration of the standard controller 7 is different for the three-way flow control valve 6 than for the two-way flow control valve 5 .

That is, in the standard controller 7, the flow rate on the primary side and the secondary side is always constant, so when the air conditioning load on the secondary side is relatively high (when the air conditioning starts up), the chiller pump 4b is set at 50% of the rated capacity of the chiller pump 4b. All 4 units are in constant operation, and when the air conditioning load on the secondary side is normal (during normal load fluctuations), all 4 units are always in operation at 25% of the rated capacity of the chiller pump 4b. (similar to the control in FIG. 2).

A control device, a control method, and a program for a heat source machine in an air conditioning system according to the present invention will be described below.
As shown in FIG. 5, the controller 17 according to the present invention includes a controller 17 having a CPU 26, and a memory 18 in which programs (computer programs) of FIGS. 6 to 9 (FIGS. 16 to 18 during heating) are stored. , and a memory 18 (see FIG. 12 for a specific configuration) for storing data in advance and for storing data when necessary. Specifically, it sends a command to change the outlet temperature to the chiller outlet temperature setting means 7b of the standard controller 7 (see FIG. 13). 10, 11, and 15 are functional block diagrams of the controller 17, which will be explained together with the explanation of the operation below.

Further, as shown in FIG. 12, the memory 18 stores the controller 17 of the present invention as an air conditioner valve and a valve type 18f, which is a two-way valve (see FIG. 1) in a one-pump system. Type, 3-way valve of 1-pump system (see Fig. 2), therefore, the chiller pump 4b is a constant flow type, 2-pump system is a 2-way valve (see Fig. 3), therefore, the chiller pump 4b, the secondary side pump 21 is a variable flow Type, 2-pump system with 3-way valve (see FIG. 4), therefore, the chiller pump 4b and the secondary side pump 21 are preset by the operator to be constant flow type (see FIG. 12, chiller See pump type 18g).

The air conditioning system according to the present invention has the above-described four patterns, that is, when the flow control valve 5 of the air conditioner 1a is a two-way valve (see FIG. 1) in the one-pump system, the flow rate of the air conditioner 1b is adjusted by the one-pump system. If the valve 6 is a three-way valve (see FIG. 2), if the two-pump type air conditioner 1a has a two-way valve (see FIG. 3), the two-pump type air conditioner 1b has a flow rate control valve 6 is a three-way valve (see FIG. 4), it is possible to operate corresponding to all four types of air conditioning systems.

Moreover, energy-saving operation can be performed during both cooling and heating depending on the intermediate season and peak season.

When the above-mentioned air conditioner 1a is provided (the flow rate adjustment valve 5 is a two-way valve), and the flow rate on the secondary side (air conditioner side) changes due to variable control of the flow rate adjustment valve 5 due to load fluctuations Applies to In this case, the chiller pump 4b of the chiller 4 is inevitably a variable flow pump. That is, as described above, when the air-conditioning load exceeds 50% of the rated capacity of the chiller pump 4b, so-called variable flow rate control is performed to increase the number of operating chiller pumps 4b. This situation is stored in advance in the memory 18 of the controller 17 according to the present invention as air conditioner valve type data 18f (two-way valve) (see FIG. 12), and stored in the memory 18 as chiller pump type data 18g (variable flow type). It is

When a person in the building turns on the indoor switch of the air conditioner 1, an air conditioning operation command input signal is input to the air conditioner 1a on the secondary side, the air conditioner 1a is turned on, and the chiller 4 is turned on. turn on.

(Control of standard controller 7)
The standard controller 7 (see FIG. 13) controls the operating capacity of the chiller (flow rate x inlet/outlet temperature difference) determines the number of operating chillers 4 (manufacturer's control).

(When the secondary load is relatively high, when the air conditioner starts up)
In the case of FIG. 1, here, the flow rate (F2) of the air conditioner 1a (secondary side) is 300 [m ³ /h], the secondary side return temperature of the air conditioner 1a is 11 [°C], and the chiller outlet temperature is 7 Assuming [°C] (design value = fixed),
Air conditioner load heat quantity qr = 300 x (11-7) = 1200
Suppose that the secondary side load heat quantity qr of the air conditioner 1 is 1200 [Mcal/h].

In the standard controller 7, the chiller 4 has the highest efficiency when the flow rate of the chiller 4 is 50% of the rated capacity. %, control is performed to increase the number of chillers 4 . So-called variable flow rate control is performed. In this case, the chiller 4 fully operates the four chiller pumps 4b.

The bypass valve 9 of the bypass pipe 8 (see FIG. 1) detects a preset differential pressure (the value of the secondary-side going pressure gauge Ps of the secondary-side going pipe 2 and the secondary-side return pressure gauge Pr of the return pipe 3). If the differential pressure is equal to or higher than the set differential pressure, the valve will open, and if the differential pressure is lower than the set differential pressure, the valve will close.

(When the secondary load has passed the air conditioning start-up time and is normal)
Here, the flow rate (F2) of the air conditioner 1a (secondary side) is 200 [m ³ /h], the secondary side return temperature of the air conditioner 1 is 9.5 [°C], and the chiller outlet temperature is 7 [°C]. (design value = fixed),
Air conditioner load heat qr = 200 x (9.5-7) = 500
Suppose that the secondary side load heat quantity qr of the air conditioner 1 is 500 [Mcal/h]. In this case, for example, one chiller pump 4b of the chiller 4 is operated.

In this way, in the manufacturer's controller 7, the outlet temperature of the chiller 4 is always fixed at 7 [°C] (45 [°C] during heating) (design value) from the start of air conditioning to the normal load. , was wasted.

The operation of this standard controller 7 is the same for the two-pump system (during cooling, see FIG. 3). °C], and wasted.

That is, from the viewpoint of the coefficient of performance (COP = cooling capacity/energy consumption), the higher the cooling capacity for the same energy consumption (the higher the COP value), the better the energy consumption efficiency and the better the energy saving. The relationship between the chiller outlet temperature and COP is proportional (when the chiller outlet temperature rises, the COP value also rises). ), it is said that about 3% of chiller energy saving can be realized. As described above, in the air conditioning system using the chiller 4, it is not preferable to set the outlet temperature of the chiller 4 to the design value of 7 ° C from the time of air conditioning start-up to the normal load from the viewpoint of energy saving of the chiller. .
(Hereinafter, description of the controller 17 according to the present invention)

As shown in FIG. 13, the controller 17 (FIG. 10, setting change means 17m) of the present invention is different from the standard controller 7 (FIG. 13, chiller outlet temperature setting means 7b) in the intermediate period after the rising time. During normal operation, the chiller outlet temperature Ts is obtained every control cycle (for example, every 30 minutes). is lower than the design value of 45°C by at least 1°C), by issuing a command to the standard controller 7 to set the temperature to that temperature, the standard controller 7 finally determines the outlet of the chiller 4 The setting is changed so that the design temperature is at least 1[°C] from 7[°C] (during heating, the design temperature is at least 1[°C] from 45[°C]). In addition, if the chiller outlet temperature is at least 1°C higher than the design value of 7°C (when heating is at least 1°C lower than the design value of 45°C), the chiller outlet The temperature is set in increments of 0.1 [°C] (that is, 7.1 [°C], 7.2 [°C] during cooling, 44.9 [°C], 44.8 [°C] during heating ), can be set. As a result, the setting can be changed so that the outlet temperature of the chiller 4 is forced to exceed 7 [° C.] (below 45 [° C.] during heating). When the chiller outlet temperature is increased by 0.1[°C] (reduced during heating), the energy saving effect is about 1/10 compared to when it is increased (reduced) by 1[°C].

The controller 17 according to the present invention stores programs shown in the operation procedures of the flowcharts shown in FIGS. It is assumed that the CPU 26 is provided.

Also, the controller 17 according to the present invention has a memory 18 shown in FIG. Time data (e.g. 30 minutes) 18b, control cycle data (e.g. 30 minutes) 18c, temperature abnormality data Th1 (e.g. 15 [°C] during cooling, 37 [°C] during heating) 18d, temperature compensation data Th2 (e.g. 10 [°C] during heating, 42 [°C] during heating) 18e, Chiller outlet temperature design value data (Tso data) (for example, 7 [°C] during cooling, 45 [°C] during heating) 18i, Chiller Design value data (Tro data) of inlet temperature (for example, 12 [°C] during cooling, 40 [°C] during heating) 18j, air conditioner valve type (applied air conditioner is a 2-way valve or a 3-way valve 18f and chiller pump type (whether the pump of the chiller to be applied is a constant flow rate type or a variable flow rate type) 18g are set in advance.

Further, the memory 18 is provided with a data storage area 18h, and the controller 17 controls the temperature sensors 10, 13, 16, 20, the pressure sensors 11, 15, the flowmeters 12, 14 by the data acquisition means 17q. The temperature data, pressure data, and flow rate data measured by the above-mentioned memory 18 can be temporarily stored in the data storage area 18h.

Further, the controller 17 can acquire various data stored in the memory 18 (including data temporarily stored in the data storage area 18h) in each step via the memory data acquisition means 17p. It is possible.

13, the controller 17 is connected to the external terminal 7a of the standard controller 7 (the input terminal for changing the setting of the outlet temperature of the chiller 4). The change means 17m is configured to transmit a setting maintenance signal or a setting change signal for the outlet temperature of the chiller to the standard controller 7 through the external terminal 7a.

The standard controller 7 has a CPU in which is stored a program of the operation procedure of the flow chart shown in FIG. The setting of Ts is changed from the design value of 7[°C] (during cooling) to the temperature indicated by the setting change signal (7[°C]+0.1[°C] or higher). During heating, the setting of the outlet temperature Ts of the chiller 4 is changed from the design value of 45 [°C] (during cooling) to the temperature indicated by the setting change signal (45 [°C] - 0.1 [°C] or higher). It is something to do.

(Operation of controller 17 according to the present invention, intermediate period, 1-pump system, case of cooling (heating)) (case of FIGS. 1 and 2)
In the following explanation, the control during cooling is only reversed during heating, so the explanation is mainly for cooling. It is performed by explaining the time appropriately after the cooling time.

It is assumed that a person in the room turns on the switch of the air conditioner 1 (see FIGS. 6, 16, and P1), the air conditioner 1 and the chiller 4 are turned on, and the air conditioner 1 is in a start-up state (see FIG. 6, FIG. 16, P1). 6, FIG. 16, see P2).

The controller 17 (FIG. 10, intermediate peak period determination means 17a) according to the present invention first confirms the current date based on the calendar data 18a (see FIG. 12) from the memory data acquisition means 17p, Recognize that it is a period (see P3, FIG. 16, and P3 in FIG. 6). The judgment of the interim period by the controller 17 is made based on either the above-mentioned seasonal aspect or the case where the air conditioning load of the air conditioner 1 is less than 80% of the rated capacity of the heat source equipment.

Next, the controller 17 (Fig. 10, rising time determining means 17b) determines that 30 minutes have passed since the air conditioner 1 was turned on, based on the rising time data 18b (for example, 30 minutes) acquired by the memory data acquiring means 17p. It detects whether or not it has passed (see FIGS. 6, 16, and P4). This is a step for waiting for the start-up time of the air conditioner 1 . The setting of the rise time data 18b (30 minutes) can be changed.

If the predetermined time (30 minutes) has not elapsed, the process proceeds to step P15 in FIG. Then, the controller 7 (Fig. 13, chiller outlet temperature setting means 7b) is instructed to maintain the outlet temperature Ts of the chiller 4 at the design value of 7 [°C] (45 [°C] during heating). . As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value Tso=7 [° C.] (Tso=45 [° C.] during heating) and does not change.

When the controller 17 (FIG. 10, rising time determination means 17b) determines that the predetermined time (30 minutes) has passed, the process proceeds to the next step P5 (see FIGS. 6 and 16).

The controller 17 (FIG. 10, control cycle determination means 17c) acquires the control cycle data 18c (for example, 30 minutes) acquired by the memory data acquisition means 17p, and determines whether or not the control cycle (30 minutes) has elapsed. (Refer to FIG. 6, FIG. 16, P5). When the controller 17 determines that the control cycle has passed, it recognizes that the air conditioner 1 has passed the start-up time and is operating normally (see FIGS. 6, 16, and P5). This control cycle may be, for example, 30 minutes or 1 hour, and can be set differently.

When the controller 17 (FIG. 10, control cycle determination means 17c) determines that the control cycle (30 minutes) has not yet passed, the process proceeds to step P15 in FIG. Similarly, the setting maintaining means 17n in FIG. 10) sets the outlet temperature Ts of the chiller 4 to the design value of 7 [° C.] for the standard controller 7 (chiller outlet temperature setting means 7b in FIG. 13). command to maintain the value of 45[°C]). As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value Tso=7 [° C.] (Tso=45 [° C.] during heating) and does not change.

Next, when the controller 17 (FIG. 10, control cycle determination means 17c) determines that the control cycle (30 minutes) has passed in step P5 of FIG. 6 (FIG. 16), the air conditioner 1 operates normally. The controller 17 (FIG. 10, temperature abnormality determination means 17d) determines that the temperature Ts2 (FIGS. 1 and 2 measured value of the temperature sensor 10) is higher than Th1=15° C. (Th1 data 18d) (Th1=37 [° C.] during heating) stored in the memory 18 (Ts2 >Th1) (Ts2<Th1 during heating) (see FIGS. 6 and 16 and step P6). The basis for setting this Th1 (temperature abnormality) to 15 [°C] (during cooling) is that the design value of the outlet temperature of the chiller 4 is 7 [°C], and the difference between the outlet temperature and the inlet temperature of the chiller 4 that is generally used Since the design value of the difference ΔT is 7 [°C], when the inlet temperature of the chiller 4 is 14°C (7 + ΔT), Th1 (temperature abnormality) is set to +1 [°C] (= 15 [°C]). there is

At the time of heating, the basis for setting this Th1 (temperature abnormality) to 37 [°C] is that the design value of the outlet temperature of the chiller 4 is 45 [°C], and the outlet temperature and inlet temperature of the commonly used chiller 4 Since the design value of the difference ΔT is 7 [°C], Th1 (temperature abnormality) is set to -1 [°C] (= 37 [°C]) when the inlet temperature of the chiller 4 is 38°C (7 + ΔT). ing.

This Th1 = 15 [°C] (during cooling) is a temperature abnormality ( For example, the people in the room feel hot, the dehumidification is not very good, the machine is not able to handle exhaust heat treatment, etc.). When the side-going temperature Ts becomes 37[° C.] or less, a state is set in which the person in the room feels cold).

Therefore, the controller 17 (FIG. 10, temperature abnormality determination means 17d) receives the temperature data Ts2 from the secondary side going temperature sensor 10 via the data acquisition means 17q, and receives the secondary side going temperature data Ts2. is compared with the set temperature Th1 (15 [°C]) (37 [°C] during heating) (see Figs. 6 and 16, step P6).

During cooling, the controller 17 (FIG. 10, temperature abnormality determination means 17d) receives the input of the secondary side going temperature data Ts2, and the secondary side going temperature Ts2 of the cold water in the secondary side going piping 2 is Th1. (= 15 ° C.) If it is determined that the cold water outlet temperature Ts2 on the outlet side of the chiller 4 is not yet cooled to the design value of 7 [° C.], the process proceeds to step P15 in FIG. The maintaining means 17n sets the outlet temperature Ts of the chiller 4 to the design value of 7 [° C.] and instructs the standard controller 7 to that effect. As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7[°C] and does not change.

During heating, the controller 17 (FIG. 10, temperature abnormality determination means 17d) receives the input of the secondary side going temperature data Ts2, and the secondary side going temperature Ts2 of hot water in the secondary side going piping 2 is Th1. (= 37 ° C.), it means that the hot water outlet temperature Ts2 on the outlet side of the chiller 4 has not yet reached the design value of 37 [° C.], so the process proceeds to step P15 in FIG. The maintaining means 17n sets the outlet temperature Ts of the chiller 4 to the design value of 45[° C.] and instructs the standard controller 7 to that effect. As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 45 [° C.] and does not change.

The controller 17 (FIG. 10, temperature abnormality determination means 17d) receives the input of the current temperature data Ts2, and the secondary-side going temperature Ts2 of cold water (hot water) in the secondary-side going pipe 2 is Th1 (= 15 [° C.]) (Th1=37 [° C.] during heating).

At step P7 in FIG. 6 (FIG. 16), the controller 17 (FIG. 10, temperature compensation determination means 17e) receives the temperature data Ts2 from the temperature sensor 10 (FIGS. 1 and 2) of the outgoing pipe 2 on the secondary side. An input is received via the data acquisition means 17q, and the secondary side going temperature Ts2 is Th2=10 [° C.] (Th2 data 18e) (Th2=42 [° C.] during heating) to determine whether it is higher (Ts2>Th2) (Ts2<Th2 during heating). Here, the grounds for Th2=10 [° C.] during cooling are not particularly defined, but the temperature is set at a temperature that does not make people in the building feel hot and humid. As a guide, it is desirable to set the design outlet temperature Tso of the chiller 4 to about 7 [° C.] + 1 [° C.] to 5 [° C.] (in the case of the present invention, 7 [° C.] + 3 [° C.] = 10 [° C.] ). Although there is no particular rule as to why Th2=42 [° C.] during heating, the temperature is set at a temperature that does not make people in the building feel cold. As a guideline, about 45 [° C.]−1 [° C.] to 5 [° C.], which is the design outlet temperature Tso of the chiller 4, is desirable (in the case of the present invention, 45 [° C.]−3 [° C.]=42 [° C.] ).

The controller 17 (FIG. 10, temperature compensation determination means 17e) receives temperature data input from the secondary side going temperature sensor 10, and receives the temperature data Ts2 and the set temperature Th2 (10 [° C.]) (during heating Th2=42 [° C.]).

When the controller 17 (FIG. 10, temperature compensation determination means 17e) determines that the secondary side outgoing temperature Ts2 is still higher than Th2 (=10 [° C.]) during cooling, the chilled water on the outlet side of the chiller 4 Since the temperature Ts of has not cooled to the design value of 7 [°C], the process proceeds to step P15 in FIG. 6, the outlet temperature Ts of the chiller 4 is set to the design value of 7 [°C], and the standard controller 7 13. Command to that effect to the chiller outlet temperature setting means 7b). As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7[°C] and does not change.

During heating, when the controller 17 (Fig. 10, temperature compensation determination means 17e) determines that the secondary side outgoing temperature Ts2 is still lower than Th2 (= 42 [°C]), the hot water on the outlet side of the chiller 4 Since the temperature Ts of the chiller 4 has not yet reached the design value of 45 [°C], the process proceeds to step P15 in FIG. 13. Command to that effect to the chiller outlet temperature setting means 7b). As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 45 [° C.] and does not change.

When the controller 17 (FIG. 10, temperature compensation determining means 17e) determines that the secondary side forward temperature Ts2 is lower than Th2 (=10 [° C.]) during cooling, the air conditioner 1 cools the room considerably. Since it is in the state of coming, it transfers to step P8 of FIG. During heating, when the controller 17 (FIG. 10, temperature compensation determining means 17e) determines that the secondary side outgoing temperature Ts2 is higher than Th2 (=42 [° C.]), the air conditioner 1 warms the room considerably. Therefore, the process proceeds to step P8 in FIG.

In step P8, the controller 17 (FIG. 10, heat quantity calculation means 17f) transmits the flow rate data (F2) of the return pipe 3 on the secondary side to the flow rate sensor 14 (FIGS. 1 and 2) via the data acquisition means 17q. ), and the temperature data (Tr2) of the secondary-side return temperature is obtained from the temperature sensor 13 . Also, the previous time set outlet temperature pTs of the chiller 4 is obtained, and the current required heat quantity qr of the air conditioner 1 (secondary side) is obtained by the following equation (1). The outlet temperature set at the previous time pTs is the outlet temperature set at the previous time of the control cycle, 30 minutes before the control cycle in the case of this embodiment, and pTs (=Tso) = 7 [°C]. (pTs=45[°C] during heating). The outlet temperature set at the previous time pTs is, for example, the outlet temperature of the heat source device 4 set at the previous time, and is initially the designed outlet temperature Tso of 7°C. ) becomes the outlet temperature Ts of the heat source machine obtained by the outlet temperature calculation means.

qr=F2×(Tr2−pTs) (1) (Step P8 in FIG. 6)
(When heating, qr = F2 x (pTs - Tr2) (1')) (Step P8 in FIG. 16)
qr: required heat quantity on the air conditioner side (secondary side) [Mcal/h]
F2: Secondary flow rate [m ³ /h]
Tr2: Secondary return temperature [°C]
pTs: Previous time set outlet temperature [°C]

In this case, F2 = 200 [m ³ /h], Tr2 = 9.5 [°C] (Tr2 = 42 [°C] during heating), pTs = 7 [°C] (pTs = 45 [°C] during heating) , the required amount of heat qr for the air conditioner 1 is 500 [Mcal/h] (qr=600 [Mcal/h] during heating).

The controller 17 (FIG. 10, heat quantity calculation means 17f) stores the value of qr (500 [Mcal/h]) (600 [Mcal/h] during heating) and the secondary side flow rate F2 data in the memory 18. Store in area 18h (see FIG. 12).

Next, in step P9 of FIG. 6 (step P9 of FIG. 16 during heating), the controller 17 (FIG. 10, heat quantity determination means 17g) determines the required heat quantity qr of the air conditioner 1 calculated in step P8 and the chiller 4 (primary side rated capacity) q1 (qr≤q1). In this case, the rated capacity of the chiller 4 is the total rated capacity of all the chillers 4 (four units). This is because it is determined that if all the chillers 4a are within the operating capability, control is possible and there is no problem with heat supply. In this case, if the rated capacity of one chiller 4a is, for example, 500 [Mcal/h] (600 [Mcal/h] during heating), q1=2000 [Mcal/h] for four units.

The controller 17 (FIG. 10, heat quantity determination means 17g)
qr (required heat amount of air conditioner 1 = 500 (600 during heating) ≤ q1 (rated capacity of chiller 4 = 2000)
In this case, since the required heat quantity qr of the air conditioner 1 is equal to or less than the rated capacity q1 of the chiller 4, it is judged that control is possible (the required heat quantity qr of the air conditioner 1 is less than the rated capacity of the heat source device 4 determined to be within the range), and proceeds to the next step P10 (FIGS. 6 and 16).

If the required amount of heat qr exceeds the rated capacity q1 of the chiller 4, it is determined that control is impossible, and the process proceeds to step P15 in FIG. is set to the design value of 7 [°C] (45 [°C] during heating), and the standard controller 7 is instructed to that effect. As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7[°C] (45[°C] during heating) and does not change.

Next, the controller 17 (FIG. 10, chiller pump determination means 17h) proceeds to step P10 in FIG. 6 (step P10 in FIG. 16 during heating) to determine whether the pump 4b of the primary side chiller 4 has a variable flow rate. to decide.

The controller 17 (FIG. 10, chiller pump determination means 17h), when the pump 4b of the primary side chiller 4 is a "variable flow rate" (when the flow rate adjustment valve 5 of the air conditioner 1a in FIG. 1 is a two-way valve), The process proceeds to step P11 in FIG. 6 (FIG. 16 during heating). In this case, it is assumed that an air conditioner 1a having a two-way flow control valve 5 is installed as the air conditioner 1. FIG. In this case, the controller 17 determines that the flow control valve 5 of the air conditioner 1a is a two-way valve from the beginning by the installer of the controller 17 according to the equipment of the corresponding air conditioning system. It is pre-stored in the machine valve type data 18f (see FIG. 12), and the chiller pump type data 18g (see FIG. 12) is also pre-stored to be a "variable flow rate" according to the air conditioner 1a. 17 (Fig. 10, chiller pump discrimination means 17h) recognizes these data in advance. Therefore, the controller 17 (chiller pump discriminating means 17h) recognizes that the chiller pump is a "variable flow rate" based on the chiller pump type data 18g from the memory data acquisition means 17p, and the step of FIG. 6 (FIG. 16) is performed. Move to P11.

The controller 17 (FIG. 10, outlet temperature calculation means 17i) calculates the current outlet temperature Ts of the chiller 4 at step P11 (variable flow rate) in FIG. It is obtained by the following equation (2) based on the quantity of heat qr.
Ts=Tro-qr/F2 (2)
(During heating Ts=Tro+qr/F2 (2'))
Ts: Outlet temperature of chiller 4 [°C]
Tro: Tso (7 [°C]) + design temperature difference ΔT (ΔT = 5 [°C] ~ 7 [°C]
(During heating Tro: Tso (45 [°C] - Design temperature difference ΔT (ΔT = 5 [°C] to 7 [°C])

Tro [°C] is a design value and is a temperature obtained by adding a design temperature difference ΔT [°C] to Tso (design value of chiller outlet temperature: 7 [°C]), and normally Tro = 7 [°C] Assume that +5 [° C.]=12 [° C.] (see FIG. 12, Tro data 18j in memory 18). At the time of heating, Tro [°C] is a design value and is a temperature obtained by subtracting a design temperature difference ΔT [°C] from Tso (design value of chiller outlet temperature: 45 [°C]). Assume that the temperature is set to 45 [° C.]−5 [° C.]=40 [° C.] (see FIG. 12, Tro data 18j in the memory 18).

The controller 17 (FIG. 10, outlet temperature calculation means 17i) reads out the Tro data (12 [° C.]) (40 [° C.] during heating) from the memory 18 via the memory data acquisition means 17p. 18 from the data storage area 18h of the air conditioner 1a side required heat quantity qr and the secondary side flow rate F2 is calculated, the above equation (2) is calculated, the outlet temperature Ts [°C] of the chiller 4 is obtained, and the data in the memory 18 Store in the storage area 18h.
for example,
Ts = Tro (12 [°C]) - [qr (500 [Mcal/h]) ÷ F2 (200 [m ³ /h])]
= 9.5 [°C]
When heating
Ts = Tro (40 [°C]) + [qr (600 [Mcal/h]) ÷ F2 (200 [m ³ /h])]
= 43 [°C]
becomes.

The controller 17 ( FIG. 10 , outlet temperature calculation means 17 i ) stores the calculation result Ts=9.5 [° C.] (Ts=43 [° C.] during heating) in the data storage area 18 h of the memory 18 . After that, the controller 17 (FIG. 10, outlet temperature comparison means 17k) proceeds to step P13 in FIG. It is determined whether or not the value is higher than Tso=7 [° C.] (Ts>Tso) (Ts<Tso during heating).

In step P13 of FIG. 6 (FIG. 16 during heating), the controller 17 ( FIG. 10 , outlet temperature comparison means 17k) determines the chiller outlet temperature Ts (=9.5° C.) obtained in step P11 ( Ts = 43 [°C]) is higher than the design value Tso (= 7 [°C]) (Tso = 45 [°C] during heating) (lower during heating). 16), step P13 becomes YES, and the controller 17 (Fig. 10, setting change means 17m) sends the standard controller 7 (Fig. 13, chiller outlet temperature setting means 7b) to the standard controller 7 (Fig. 13, chiller outlet temperature setting means 7b) via the input terminal 7a (Fig. ), command to change the setting of the outlet temperature Ts of the chiller 4 to 9.5 [°C] (43 [°C] during heating) (see P14 of FIG. 6 (FIG. 16 during heating)).

As a result, the standard controller 7 (FIG. 13, chiller outlet temperature setting means 7b) detects that a setting change signal has been input via the input terminal 7a (see FIG. 14P1), and sets the outlet temperature of the chiller 4 to the design value. from 7 [° C.] to 9.5 [° C.] (from 45 [° C.] to 43 [° C.] during heating) (see P2 in FIG. 14).

As a result, the outlet temperature Ts of the chiller 4 rises from 7 [° C.] to 9.5 [° C.], which is higher than 1 [° C.] (from 45 [° C.] to 43 [° C.], which is lower than 1 [° C.] during heating) ( It can be lowered during heating), and the efficiency of the heat source machine can be improved.

In step P13 of FIG. 6 (FIG. 16 during heating), the controller 17 determines that the outlet temperature Ts of the chiller 4 is lower than the design temperature Tso=7 [° C.] (Tso=45 [° C.] during heating). or equal (higher or equal during heating), the process proceeds to step P15 in FIG. 45[° C.]), and instructs the standard controller 7 (FIG. 13, chiller outlet temperature setting means 7b) to that effect (see FIG. 6, FIG. 16, P15). As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7 [°C] (45 [°C] during heating) without any change, and returns to step P4.

After that, the controller 17 returns to step P4, and since the rising time has already passed, it proceeds to step P5, and the control cycle determination means 17c (see FIG. 10) determines whether or not the control cycle of 30 minutes has passed. to decide. After that, in every 30-minute control cycle, the air conditioner side (secondary side) heat quantity qr is calculated in step P8, and if controllable, the chiller outlet temperature is obtained by calculation in step P11, and the design value If it is higher than (7 [°C]) (45 [°C] during heating) (lower during heating), instruct the standard controller 7 to increase the chiller outlet temperature (lower during heating) (Refer to step P14 in FIG. 6 (FIG. 16 during heating)).

In this way, in the intermediate period, the secondary-side required heat quantity qr is calculated every 30 minutes, which is the control cycle, and if control is possible, the chiller outlet corresponding to the calculated secondary-side required heat quantity qr If the temperature Ts is obtained by calculation and the value (temperature) is 1 [°C] or more higher than the design value (7 [°C]) of the chiller outlet temperature on the manufacturer side (1 [°C] or more lower during heating) , a setting change signal is sent to the standard controller 7 so as to change the setting to the outlet temperature Ts of the chiller obtained by the calculation. As a result, energy can be saved in the air conditioning system as a whole.

(Fig. 2 1-pump system, when the flow control valve 6 of the air conditioner 1b is a 3-way valve)
Next, the case where the flow control valve 6 of the air conditioner 1b is a three-way valve will be described.
Steps P1 to P9 in FIG. 6 (FIG. 16 in the case of heating) are the same as in FIG. 1, so description thereof is omitted.

In step P10 of FIG. 6 (FIG. 16 for heating), the controller 17 (FIG. 10, chiller pump discrimination means 17h) determines that the pump 4b of the primary side chiller 4 is at a "constant flow rate", as shown in FIG. 6 (heating In the case of , the process proceeds to step P12 in FIG. In this case, as the air conditioner 1, the air conditioner 1b having the three-way flow control valve 6 shown in FIG. 2 is installed.

The controller 17 (FIG. 10, outlet temperature calculation means 17j) obtains the outlet temperature Ts of the chiller 4 from the following equation (3) in step P12 of FIG. 6 (FIG. 16).
Ts=Tro-qr/F1 (3)
(During heating Ts=Tro+qr/F1 (3'))
Ts: Outlet temperature of chiller 4 [°C]
Tro: Tso (7 [°C]) + design temperature difference ΔT (ΔT = 5 [°C] to 7 [°C])
(During heating Tro: Tso (45 [°C] - Design temperature difference ΔT (ΔT = 5 [°C] to 7 [°C])
Tro [°C] is a design value, which is the same as in step P11 above, and is set to 12 [°C]. Because of the one-pump system, the primary side flow rate≧secondary side flow rate is always satisfied, and since F1 with a larger denominator is on the safer side, the denominator is set to "F1".

At the time of heating, Tro [°C] is a design value and is a temperature obtained by subtracting a design temperature difference ΔT [°C] from Tso (design value of chiller outlet temperature: 45 [°C]). Assume that the temperature is set to 45 [° C.]−5 [° C.]=40 [° C.] (see FIG. 12, Tro data 18j in the memory 18).

The controller 17 (FIG. 10, outlet temperature calculation means 17j) reads out the Tro data (12° C.) (40° C. during heating) 18j from the memory 18 (see FIG. 12), and similarly stores the data in the memory 18. The required amount of heat qr on the air conditioner side is read out from the area 18h. Further, the controller 17 ( FIG. 10 , outlet temperature calculation means 17j) obtains a flow rate F1 (for example, 400 [m ³ /h]) from the primary side flow rate sensor 12 via the data acquisition means 17q. Data F1 is detected and the flow rate data F1 is stored in the data storage area 18h of the memory 18. FIG.

Then, the controller 17 ( FIG. 10 , outlet temperature calculation means 17 j ) calculates the above equation (3) to obtain the outlet temperature Ts [° C.] of the chiller 4 and stores it in the data storage area 18 h of the memory 18 .

for example,
Ts = Tro (12 [°C]) - [qr (500 [Mcal/h]) ÷ F1 (400 [m ³ /h]] = 10.75 [°C]
Suppose it became
When heating
Ts = Tro (40 [°C]) + [qr (600 [Mcal/h]) ÷ F1 (400 [m ³ /h])]
= 41.5 [°C]

The controller 17 stores the calculation result Ts=10.75 [° C.] (Ts=41.5 [° C.] during heating) in the data storage area 18h of the memory 18 (see FIG. 12). Thereafter, the controller 17 (FIG. 10, outlet temperature comparing means 17k) proceeds to step P13 in FIG. .5[°C]) is higher than the design value Tso=7[°C] (Tso=45[°C] during heating) (Ts>Tso) (Ts<Tso during heating).

In step P13 of FIG. 6 (FIG. 16 during heating), the controller 17 ( FIG. 10 , outlet temperature comparison means 17k) determines the chiller outlet temperature (10.75 [° C.]) obtained in step P12 ( 41.5 [°C]) is higher than the design value Tso (= 7 [°C]) (because it is lower than the design value of 45 [°C] during heating), so Fig. 6 (Fig. 16 during heating) In step P14, the controller 17 ( FIG. 10 , setting change means 17m) sets the outlet temperature Ts of the chiller 4 to 10.75 [° C.] (41.5 [° C.] during heating), the standard controller 7 is instructed to that effect. As a result, the standard controller 7 (Fig. 13, chiller temperature setting means 7b) changes the outlet temperature setting of the chiller 4 from the design value of 7[°C] to 10.75[°C] (the design value of 45[°C] during heating). ] to 41.5 [° C.]) (see P1 and P2 in FIG. 14).

As a result, the outlet temperature Ts of the chiller 4 can be increased from 7 [°C] to 10.75 [°C], which is higher by 1 [°C] or more (during heating, 45 [°C] to 41 [°C], which is lower by 1 [°C] or more). .5 [°C]), and the efficiency of the heat source equipment can be improved.

After that, the controller 17 returns to step P4 (see FIGS. 6 and 16). Since the rise time has already passed, the control cycle determining means 17c determines whether or not the control cycle of 30 minutes has passed. to judge whether After that, in every 30-minute control cycle, the air conditioner side (secondary side) required heat amount qr is calculated in step P8, and if controllable, the chiller outlet temperature Ts is obtained by calculation in step P12, and the design If it is higher than the value (7°C) (if it is lower than the design value (45°C) during heating), instruct the standard controller 7 to raise the chiller outlet temperature (lower it during heating). (FIGS. 6 and 16, step P14).

In this way, in the intermediate period, the secondary-side required heat quantity qr is calculated every 30 minutes, which is the control cycle, and if control is possible, the chiller outlet corresponding to the calculated secondary-side required heat quantity qr Calculate the temperature Ts, and if the value (temperature) is 1°C or more higher than the design value of the chiller outlet temperature on the manufacturer side (if it is 1°C or more lower during heating), the chiller outlet calculated by the calculation A setting change signal is sent to the standard controller 7 so as to change the setting to temperature. As a result, energy can be saved in the air conditioning system as a whole.

(Operation of the controller 17 according to the present invention, intermediate period, 2-way valve, 2-pump system, common during cooling and heating, see FIG. 3)
The control of the controller 17 in the case of the two-pump system is substantially the same as the control procedure of the one-pump system (FIGS. 1 and 2), but between steps P7 and P8 in FIG. 6 (FIG. 16 during heating) In addition, since there is a unique control in the two-pump system, this point will be explained with reference to FIG. 7 (common to cooling and heating).

By the way, it is said that if the outlet side temperature Ts of the chiller 4 is raised by 1°C (or lowered by 1°C during heating), the energy saving effect of the chiller 4 can be obtained up to 3%. In this two-pump system, if the temperature Ts on the outlet side of the chiller 4 is raised by 1°C (or lowered by 1°C during heating), the temperature difference between the cold water (hot water) on the inlet side and the outlet side of the air conditioner 1 decreases ( heat quantity = flow rate x temperature difference), in order to secure the necessary heat quantity, it is predicted that the two-way valve 5 of the air conditioner 1 will automatically open and the flow rate on the secondary side will increase. If 1b is a three-way valve (see FIG. 4), there is no change in the flow rate on the secondary side, so there is no need to consider an increase in the flow rate on the secondary side). At this time, in the two-pump system, the flow rate of the secondary side pump 21 increases (when the two-way valve 5 automatically opens, the pressure fluctuation causes the secondary side pump 21 to adjust the flow rate to the set pressure. ), it is predicted that the energy saving effect of the air conditioning system as a whole will decrease.

Therefore, steps P16 to P18 in FIG. 7 are provided, and if the rate of increase in the secondary flow rate exceeds the reference value I0 (110%), the outlet temperature setting of the chiller 4 is assumed to be unchanged (the design value of 7 [ ℃]) (maintain at 45[℃] during heating), and only when the increase rate of the secondary flow rate does not exceed the reference value I0 (110%), raise the outlet temperature setting of the chiller 4 It is designed to change the direction (the downward direction during heating). 110% of the reference value I0 is stored in advance as reference value data 18k in the memory 18 (see FIG. 12).

In step P7 of FIG. 6 (FIG. 16 during heating), in the controller 17 (FIG. 10, temperature compensation determination means 17e), the secondary side going temperature Ts2 of the secondary side going pipe 2 is set to Th2 (10 [ ° C.]) (42 [° C.] during heating) (increase during heating), the process proceeds to step P16 in FIG. compares the flow rate F1 on the primary side with the flow rate F2 on the secondary side.

At this time, the controller 17 (FIG. 11, flow rate comparison means 17r) acquires the primary side flow rate F1 and the secondary side flow rate F2 from the primary side flow rate sensor 12 and the secondary side flow rate sensor 14 via the data acquisition means 17q. , and stores each data in the data storage area 18 h of the memory 18 .

Next, the controller 17 (FIG. 11, secondary side flow rate increase rate calculation means 17s) calculates the secondary side flow rate increase rate I2 from the values of the primary side flow rate F1 and the secondary side flow rate F2 by the following equation (4). (see P17 in FIG. 7), and the controller 17 (FIG. 11, increase rate comparison means 17t) compares it with a reference value (110%) 18k stored in advance in the memory 18 (I2≧I0) (FIG. 7, See page 18).
I2=F2/F1×100[%] (4)

After that, the controller 17 (FIG. 11, increase rate comparison means 17t) moves to step P15 in FIG. Then, the outlet temperature Ts of the chiller 4 is set to the design value of 7 [°C] (45 [°C] during heating), and the standard controller 7 is instructed to that effect. As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7[°C] (45[°C] during heating) and does not change. Therefore, since the temperature difference is maintained, the two-way valve 6 of the air conditioner 1 will not automatically open.

On the other hand, the controller 17 (FIG. 11, increase rate comparison means 17t), when the secondary side flow rate increase rate I2 is lower than the reference value I0 (110%) (step P18 in FIG. 7), The process proceeds to the next step P8 to enter the calculation of the secondary side required heat amount qr. In this case, steps P9 to P13 in FIG. 6 (FIG. 16) are performed in the same manner, and in step P14 in FIG. 7 [°C]) or higher (Tso is 45 [°C] or lower during heating), the controller 17 (Fig. 10, setting change means 17m) changes the primary side going temperature Ts to the standard controller 7 (Fig. 13. Command the chiller outlet temperature setting means 7b). That is, the controller 17 (FIG. 11, increase rate comparison means 17t) gives a command to perform normal control to the heat quantity calculation means 17f.

The standard controller 7 (FIG. 13, chiller outlet temperature setting means 7b) sets the outlet temperature of the chiller 4 to Ts (>7° C.) (Ts (<45° C.) during heating) at steps P1 to P2 in FIG. set to

As a result, the outlet temperature Ts of the chiller 4 is increased to 7 [°C] or more (during heating, it is decreased to 45 [°C] or less) only when the rate of increase I2 of the secondary flow rate is lower than the reference value (110%). It is possible to improve the efficiency of the air conditioning system without performing wasteful operations.

In addition, when the air conditioner 1b is a 2-pump system and the air conditioner 1b is a 3-way valve (in the case of FIG. 4), the pressure on the secondary side does not change, and the flow rate on both the primary side and the secondary side becomes constant. Since there is no change in the flow rate on the following side, the controller 17 proceeds from step P7 to step P8 without transitioning to the control of FIG.

Next, control during the peak period will be described.
(Operation of the controller 17 according to the present invention, peak season, common to 1-pump system and 2-pump system) (Refer to FIGS. 8 and 9 during cooling, and FIGS. 17 and 18 during heating)
It is assumed that a person in the room turns on the switch of the air conditioner 1 (see FIGS. 8, 17, and P1), the air conditioner 1 and the chiller 4 are turned on, and the air conditioner 1 is in a start-up state (see FIG. 8, FIG. 17, P1). 8, FIG. 17, see P2).

The controller 17 (FIG. 15, intermediate peak period determination means 17a) according to the present invention first confirms the current date based on the calendar data 18a (see FIG. 12) from the memory data acquisition means 17p. Recognize that it is a period (see Figure 8, Figure 17, P3). Judgment by the interim period/peak period judgment means 17a is made based on either the above-mentioned seasonal aspect or the case where the air conditioning load of the air conditioner is 80% or more of the rated capacity of the heat source equipment.

Thereafter, steps P4 to P7 in FIG. 8 (FIG. 17 for heating) are the same as in the intermediate period. That is, in step P4 of FIG. 8 (FIG. 17), wait for the rise time (for example, 30 minutes) to elapse, wait for the elapse of the control period (for example, 30 minutes) in step P5 of FIG. 17) In step P6, it is determined whether or not the chiller secondary side going temperature Ts2 exceeds the set temperature Th1 (= 15 [°C]) (Th1 = 37 [°C] during heating), and Ts2 is 15 [°C]. ] (when Th1 is higher than 37 [°C] during heating), in step P7 of FIG. ) (Th2 = 42 [°C] during heating), and if Ts2 is lower than 10 [°C] (if Ts2 exceeds 42 [°C] during heating), Figs. to step P8.

In each step P4 to P7 above, if the rise time has not elapsed, if the control period has not elapsed, or if Ts2 exceeds 15°C (when Ts2 is lower than 37 [°C] during heating) , If Ts2 exceeds 10 [° C.] (if Ts2 is lower than 42 [° C.] during heating), the process proceeds to step P20 in both FIGS. 9 and 18, and the outlet temperature Ts of the chiller 4 is set to the design value The temperature is set to 7 [°C] (45 [°C] of the design value during heating), and the standard controller 7 (Fig. 13, chiller outlet temperature setting means 7b) is instructed to that effect. As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7[°C] (45°C during heating) and does not change.

Next, in step P8 (FIGS. 8 and 17), the controller 17 (FIG. 15, data acquisition means 17q) acquires the primary flow rate F1 from the primary flow rate sensor 12 and the secondary flow rate sensor 14. After acquiring the secondary flow rate F2, the controller 17 (FIG. 15, flow rate comparison means 17r') compares the primary flow rate F1 and the secondary flow rate F2 (see FIGS. 8 and 17P8).

By the way, it is said that if the outlet side temperature Ts of the chiller 4 is raised by 1 [°C] (or lowered by 1 [°C] in the case of heating), the energy saving effect of the chiller 4 can be obtained by up to 3%. In the two-pump system (in the case of FIG. 3), if the temperature Ts on the outlet side of the chiller 4 is raised by 1 [°C] (or lowered by 1 [°C] in the case of heating), the chilled water on the inlet side and the outlet side of the air conditioner 1 Since the temperature difference decreases (heat amount = flow rate x temperature difference), it is predicted that the two-way valve 5 of the air conditioner 1b will automatically open and the flow rate on the secondary side will increase in order to secure the necessary heat amount. be done. In this two-pump system (in the case of FIG. 3), it is predicted that the flow rate of the secondary side pump 21 will increase and the energy saving effect of the air conditioning system as a whole will decrease.

In the one-pump system (see FIGS. 1 and 2), the primary side flow rate≧the secondary side flow rate is always satisfied, so the secondary side flow rate never exceeds the primary side flow rate. Further, when the air conditioner 1b is a three-way valve (in the case of the flow rate regulating valve 6 in FIG. 4), there is no fluctuation in the secondary side flow rate.

Therefore, steps P8 to P10 are provided in FIG. 8 (FIG. 17), and if the rate of increase in the secondary flow rate exceeds the reference value I0 (110%), the outlet temperature setting of the chiller 4 is assumed to be unchanged (design value 7 [°C] (45 [°C] for heating), and only if the rate of increase in secondary flow rate does not exceed the reference value I0 (110%), raise the outlet temperature setting of chiller 4 It is designed to change to the direction to increase (in the case of heating, the direction to descend).

Therefore, it is only in the case of FIG. 3 that the process proceeds to steps P8 to P10 below, and in the cases of FIGS. 1, 2 and 4, the process proceeds from step P8 to step P11.

Therefore, (in the case of FIG. 3 (two-pump system, two-way valve)), in step P8, if the secondary flow rate F2 is greater than the primary flow rate F1, the controller 17 (FIG. 15, secondary flow rate increase rate 8 and 17, the calculation means 17s') obtains the secondary flow rate increase rate I2 from the values of the primary flow rate F1 and the secondary flow rate F2 according to the following equation (5) (Fig. 8 , FIG. 17, P9), the controller 17 (FIG. 15, increase rate comparison means 17t′) compares with a reference value (110%) 18k stored in advance in the memory 18 (FIG. 12) (I2≧I0 ) (see FIGS. 8 and 17, page 10).
I2=F2/F1×100[%] (5)

After that, the controller 17 (Fig. 15, increase rate comparison means 17t'), when the secondary side increase rate I2 is equal to or greater than the reference value I0 (110%) (see Figs. 8, 17, P10), Fig. 9 ( 18), the outlet temperature Ts of the chiller 4 is set to the design value of 7 [°C] (45 [°C] in the case of heating), and the standard controller 7 is instructed to that effect. As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7[°C] (45[°C] in the case of heating) and does not change. Therefore, since the temperature difference is maintained, the two-way valve 6 of the air conditioner 1 will not automatically open.

On the other hand, the controller 17 (Fig. 15, increase rate comparison means 17t') moves to the next step P11 in Figs. 8 and 17 when the secondary flow rate increase rate I2 is lower than the reference value I0 (110%). Then, the calculation of the secondary heat quantity qr is started.

If the primary flow rate F1 is greater than the secondary flow rate F2 at step P8 in FIGS. 8 and 17, the control at steps P9 and P10 is skipped and the process proceeds to step P11. This is because, when the primary flow rate is greater than the secondary flow rate, the bypass piping 8 allows the high-temperature secondary flow remaining from the return piping 3 to join the incoming piping 2, preventing the incoming temperature from rising. .

In step P11 (FIGS. 8 and 17), the controller 17 (FIG. 15, heat quantity calculation means 17f′) acquires the flow rate data (F2) of the secondary side return pipe 3 via the data acquisition means 17q. The temperature data (Tr2) of the secondary-side return temperature is obtained from the temperature sensor 13 while being obtained from the sensor 14 . Also, the outlet temperature Tso of the chiller 4 is obtained, and the current required heat amount qr of the air conditioner 1 (secondary side) is obtained by the following equation (6). The chiller outlet temperature Tso is a design value of 7 [°C] (45 [°C] during heating).

qr=F2×(Tr2−Tso) (6) (Step P11 in FIG. 8)
(During heating, qr = F2 x (Tso-Tr2) (6') (step P11 in Fig. 17))
qr: required heat quantity on the air conditioner side (secondary side) [Mcal/h]
F2: Secondary flow rate [m ³ /h]
Tr2: Secondary return temperature [°C]
Tso: Chiller outlet temperature [°C] (design value = 7 [°C]) (design value = 45 [°C] during heating)

In this case, F2 = 200 [m ³ /h], Tr2 = 9.5 [°C] (Tr2 = 42 [°C] during heating), and Tso = 7 [°C] (Tso = 45 [°C] during heating). Then, the required heat quantity qr of the air conditioner 1 is 500 [Mcal/h] (the heat quantity qr is 600 [Mcal/h] during heating).
The controller 17 stores the value of qr (500 [Mcal/h]) and the secondary flow rate F2 data in the data storage area 18h of the memory 18 .

Next, the controller 17 (FIG. 15, calorie determination means 17g′) determines the required calorie qr of the air conditioner 1 calculated in step P8 and the rated capacity of the chiller 4 (primary side rated capacity) q1 (qr≤q1). In this case, the rated capacity of the chiller 4 is the total rated capacity of all the chillers 4 (four units). This is because it is determined that if all the chillers 4 are within the operating capability, control is possible and there is no problem with heat supply. In this case, if the rated capacity of one chiller 4 is, for example, 500 [Mcal/h], then q1=2000 [Mcal/h] for four units.

The controller 17 (FIG. 15, heat quantity determination means 17g')
qr (required heat amount of air conditioner 1 = 500 (600 during heating)) ≤ q1 (rated capacity of chiller 4 = 2000)
In this case, since the required heat amount qr of the air conditioner 1 is equal to or less than the rated capacity q1 of the chiller 4, it is determined that control is possible, and the process proceeds to the next step P13 (FIGS. 9 and 18).

In addition, when the required heat quantity qr exceeds the rated capacity q1 of the chiller 4, it is determined that the control is impossible (step P12 in FIGS. 8 and 17), and the process proceeds to step P20 in FIGS. The outlet temperature Ts is set to the design value of 7 [°C] (45 [°C] during heating), and the standard controller 7 is instructed to that effect. As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7[°C] (45[°C] during heating) and does not change.

At step P13 in FIGS. 9 and 18, the controller 17 (FIG. 15, outlet temperature changing means 17u) further raises the outlet temperature of the chiller 4 by a° C. (in the case of heating, it is lowered by a° C.). Here, "4° C." is preset as a° C. (FIG. 12, temperature data 18n of memory 18). Also, Ts is set to a value higher (lower) by 3° C. or more than the design outlet temperature Tso=7 [° C.] (45 [° C.] during heating).

The controller 17 ( FIG. 15 , outlet temperature changing means 17 u ) sets the secondary-side outgoing temperature Ts2 to 10 [° C.] or less (42 [° C.] or more in the case of heating) in step P7 (see FIGS. 8 and 17). Therefore, if the outlet temperature setting Tso of the chiller 4 is 7 [°C] (design value) (45 [°C] in the case of heating), the set temperature of Ts is 11 [°C] of 7°C + 4°C ( = Ts). Then, the controller 17 ( FIG. 15 , outlet temperature changing means 17u) instructs the setting changing means 17m to change the chiller outlet temperature Tso to 11 [° C.] (41 [° C.] for heating). .

Based on the above instructions, the controller 17 (FIG. 15, setting change means 17m) sends the input terminal to the standard controller 7 (FIG. 13, chiller outlet temperature setting means 7b) in step P14 of FIGS. 7a (see FIG. 13) to change the setting of the outlet temperature Ts of the chiller 4 to 11 [° C.] (41 [° C.] during heating) (see FIGS. 9, 18, P14).

As a result, the standard controller 7 (FIG. 13, chiller outlet temperature setting means 7b) detects that a setting change signal has been input via the input terminal 7a (see FIG. 14P1), and sets the outlet temperature of the chiller 4 to the design value. from 7 [° C.] to 11 [° C.] (from 45 [° C.] to 41 [° C.] during heating) (see P2 in FIG. 14).

In the next step P15, the controller 17 (Fig. 15, fixed time determination means 17y) detects whether or not a fixed time (10 minutes in this case) has passed. Ts is maintained at 11 [°C] (41 [°C] during heating).

After that, the controller 17 ( FIG. 15 , outlet temperature increasing/decreasing means 17 v ) moves to the next step P16 when 10 minutes have passed, and the chiller 4 is increased by a=4° C. (decreased during heating). The outlet temperature setting Ts is lowered by b [°C] (increased by b [°C] during heating). In this case, b=1 [° C.] is desirable. That is, the following formula (7) is calculated. In this case, the designated temperature range is b=1 [° C.].
Ts=Tso+a−b×n (7)
(During heating, Ts=Tso-a+b×n (7'))
n=n+1

Therefore, the controller 17 ( FIG. 15 , outlet temperature increasing/decreasing means 17v) lowers the outlet temperature setting Ts (=11 [° C.]) of the chiller 4 by 1 [° C.] to Ts=10 [° C.] (heating When the time is raised by 1[°C], Ts=42[°C]) (FIGS. 9 and 18, step P16).

Then, the controller 17 (Fig. 15, outlet temperature increasing/decreasing means 17v) instructs the setting changing means 17m to change the chiller outlet temperature Tso to 10 [°C] (42 [°C] during heating) ( 9, 18, and page 16).

Based on the above instructions, the controller 17 (FIG. 15, setting change means 17m) sends the input terminal to the standard controller 7 (FIG. 13, chiller outlet temperature setting means 7b) in step P17 of FIGS. 7a (see FIG. 13) to change the setting of the outlet temperature Ts of the chiller 4 to 10 [° C.] (42 [° C.] during heating) (see FIGS. 9, 18, P17).

As a result, the standard controller 7 (FIG. 13, chiller outlet temperature setting means 7b) detects that a setting change signal has been input via the input terminal 7a (see FIG. 14P1), and sets the outlet temperature of the chiller 4 to the design value. 11 [° C.] to 10 [° C.] (41 [° C.] to 42 [° C.] during heating) (see P2 in FIG. 14).
After that, the controller 17 (FIG. 15, fixed time determination means 17y) proceeds to step P18, determines whether or not a fixed time (in this case, 10 minutes) has passed. Temperature Ts=10 [° C.] (42 [° C.] during heating) is maintained (see FIGS. 9, 18, and P18).

The controller 17 (FIG. 15, outlet temperature comparing means 17w) proceeds to step P19 after the lapse of the predetermined time (10 minutes), at which point the outlet temperature comparing means 17w determines the It is determined whether or not the chiller outlet temperature Ts (for example, 10[°C]) is higher than the design value Tso (=7[°C]) (45[°C] during heating). In this case, the chiller outlet temperature Ts=10 [° C.], so the result in step P19 of FIG. 9 is NO. give a command to That is, returning to step P16 in FIG. 9, the subtraction operation of the chiller outlet temperature is performed.

During heating, the chiller outlet temperature Ts=42 [° C.], so NO in step P19 of FIG. Command to raise. That is, returning to step P16 in FIG. 18, the operation of increasing the chiller outlet temperature is performed.

During this period, the chiller outlet temperature Ts can be maintained above the design value Tso=7[°C] by 1[°C] or more, so the efficiency of the heat source equipment can be improved during this period. During heating, the chiller outlet temperature Ts can be maintained at a temperature lower than the design value Tso=45 [°C] by 1 [°C] or more, so the efficiency of the heat source equipment can be improved during this period.

The controller 17 (FIG. 15, outlet temperature comparing means 17w) proceeds to step P19 after the lapse of the predetermined time (10 minutes), at which point the outlet temperature comparing means 17w determines the Chiller outlet temperature Ts (assumed to be 6 [°C]) (46 [°C] during heating) is the design value Tso (= 7 [°C]) (45 [°C] during heating) determine whether it is higher. In this case, the chiller outlet temperature Ts = 6 [°C] (46 [°C] during heating), so the result in step P19 of Fig. 9 (Fig. 18) is YES, and the process proceeds to step P20 of Figs. The means 17n sets the outlet temperature Ts of the chiller 4 to 7 [°C] (45 [°C] during heating) and instructs the standard controller 7 (Fig. 13, chiller outlet temperature setting means 7b) to that effect (Fig. 9 , FIG. 18, P20). As a result, the standard controller 7 keeps the outlet temperature setting of the chiller 4 at the design value of 7 [°C] (45 [°C] during heating) without any change, and returns to step P4 (Figs. 8 and 17). .

As described above, the present invention increases the outlet temperature of the heat source device 4 by 1° C. or more during cooling when it is determined that the required heat amount of the air conditioner can be controlled by the heat source device in the intermediate period. Since the setting can be changed to a value (a value lower by 1° C. or more during heating), energy saving can be realized for the entire air conditioning system.

In addition, in the interim period, if the air conditioning system is a two-pump system, it is expected that the flow rate on the air conditioner side (secondary side) will increase. decreases. Therefore, the increase rate of the secondary flow rate is obtained by calculation, and the increase rate is compared with the reference value (for example, 110%). Only when the temperature Tso remains unchanged and the rate of increase is below the reference value, the outlet temperature of the heat source unit can be raised (or lowered during heating) from the design outlet temperature Tso, so no unnecessary operations are performed. can improve the efficiency of the air conditioning system.

In the peak period, in the case of cooling, the outlet temperature of the heat source unit can be changed so as to decrease by 1° C., for example, from 11° C. every predetermined time. Until the outlet temperature of the heat source matches the design outlet temperature (7°C), it can be maintained higher than the design outlet temperature. and the outlet temperature of the heat source unit can be kept lower than the design outlet temperature (45°C) until it matches the design outlet temperature (45°C)). It can be performed.

Furthermore, in the present invention, the air conditioning system is generally compatible with either a one-pump system, which is common in small and medium scales, or a two-pump system, which is common in large scales. In general, heat source equipment uses two-way valve control, which is often compatible with variable current operation. It is an object of the present invention to provide an outlet set temperature control device for a heat source machine of an air conditioning system capable of realizing energy saving as. Moreover, the target heat source equipment is not limited to a chiller, and may be other heat source equipment such as a centrifugal chiller, an absorption cold/hot water generator, and the like.

INDUSTRIAL APPLICATION This invention can be utilized for the air conditioning system which adjusts the air conditioning of a predetermined space using the heat quantity of the fluid.

1a, 1b Air conditioner 2 Going pipe 3 Return pipe 4 Heat source machine (chiller)
17 Controller 17a Intermediate/Peak Period Discriminating Means 17f, 17f' Heat Quantity Calculating Means 17g, 17g' Heat Quantity Discriminating Means 17i Outlet Temperature Calculating Means 17j Outlet Temperature Calculating Means 17k Outlet Temperature Comparing Means 17m Setting Changing Means 17n Setting Maintaining Means 17r Flow Rate Comparison Means 17s Secondary side flow rate increase rate calculation means 17t Increase rate comparison means 17u Outlet temperature change means 17y Fixed time determination means 17v Outlet temperature increase/decrease means Tso Design outlet temperature Ts Outlet temperature of heat source unit Tro Design return temperature qr Required heat amount

Claims (7)

Chilled water (hot water) from the heat source equipment on the primary side is circulated to the air conditioner on the secondary side through the outgoing pipe and the return pipe, and heat is exchanged between the air introduced by the air conditioner and the cold water (hot water). , in the control device of the heat source machine of the air conditioning system that cools (heats) the indoor air with the air conditioner,
A controller capable of changing the setting of the design outlet temperature Tso of the heat source equipment is provided,
The controller includes intermediate/peak period discrimination means capable of determining whether it is an intermediate period or a peak period;
In the intermediate period determined by the intermediate period/peak period determining means,
The required heat quantity qr of the air conditioner is the temperature difference between the outlet temperature pTs set at the previous time of the control cycle of the heat source equipment and the measured secondary side return temperature Tr2 of the cold water (hot water) in the return pipe, and the measured above a calorie calculation means that can be calculated from the product of the flow rate F of the cold water (hot water) circulating in the outgoing pipe and the return pipe;
heat quantity determination means capable of determining whether or not the current required heat quantity qr of the air conditioner calculated by the heat quantity calculation means is within the range of the rated capacity of the heat source equipment;
When the heat quantity determination means determines that the required heat quantity qr of the air conditioner is within the range of the rated capacity of the heat source equipment,
Assuming that the design return temperature is Tro, the design return temperature Tro is set to a temperature 5° C. to 7° C. higher (5° C. to 7° C. lower) than the design outlet temperature Tso, and the measured flow rate is F,
Chilled water outlet temperature during cooling Ts=Tro-(qr/F)
(Hot water outlet temperature during heating Ts = Tro + (qr/F))
Outlet temperature calculation means for calculating the cold water outlet temperature (the hot water outlet temperature) Ts by calculating the above equation;
an outlet temperature comparing means capable of determining whether or not the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso;
Only when the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso by 1° C. or more according to the comparison by the outlet temperature comparing means, the design outlet temperature Tso of the heat source equipment is calculated by the outlet temperature calculating means. A setting change means capable of changing the setting to the cold water (hot water) outlet temperature Ts obtained by
When the cold water (hot water) outlet temperature Ts is equal to or lower (equal to or higher) than the design outlet temperature Tso according to the comparison by the outlet temperature comparing means, the design outlet temperature Tso of the heat source equipment can be maintained. and a setting maintenance means,
A control device for a heat source machine of an air conditioning system, wherein the above operation is repeated for each control cycle. In a control device for a heat source machine of a two-pump type air conditioning system having a primary side pump in the heat source machine and a secondary side pump on the going piping side,
In the intermediate period determined by the intermediate period/peak period determining means,
The controller detects the measured cold water (hot water) primary side flow rate F1 on the heat source equipment side and the secondary side flow rate F2 on the air conditioner side in the preceding stage of the heat quantity calculation means, and detects the secondary side flow rate F2. is greater than the primary side flow rate F1;
a secondary side flow rate increase rate calculation means capable of calculating the rate of increase of the secondary side flow rate when the secondary side flow rate F2 is greater than the primary side flow rate F1 as a result of comparison by the flow rate comparing means;
an increase rate comparison means for determining whether or not the increase rate of the secondary flow rate F2 calculated by the secondary flow rate increase rate calculation means is higher than a preset reference value;
When the increase rate of the secondary flow rate F2 is higher than the reference value as a result of the comparison by the increase rate comparison means, the increase rate comparison means determines that the design outlet temperature Tso of the heat source equipment is higher than the setting maintenance means. given the directive to maintain
Only when the rate of increase of the secondary-side flow rate F2 is lower than the reference value as a result of the comparison by the rate-of-increase comparison means, the rate-of-increase comparison means instructs the heat source calculation means to perform normal control. gives commands,
Only when the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso according to the comparison by the outlet temperature comparison means, the design outlet temperature Tso of the heat source equipment is changed by the setting changer to the outlet temperature. 2. A control device for a heat source machine of an air conditioning system according to claim 1, wherein the setting is changed to the cold water (hot water) outlet temperature Ts obtained by the calculating means. Chilled water (hot water) from the heat source equipment on the primary side is circulated to the air conditioner on the secondary side through the outgoing pipe and the return pipe, and heat is exchanged between the air introduced by the air conditioner and the cold water (hot water). , in the control device of the heat source machine of the air conditioning system that cools (heats) the indoor air with the air conditioner,
A controller capable of changing the setting of the design outlet temperature Tso of the heat source equipment is provided,
The controller includes intermediate/peak period discrimination means capable of determining whether it is an intermediate period or a peak period;
In the peak period determined by the intermediate period/peak period determining means,
The required heat quantity qr of the air conditioner is the temperature difference between the design outlet temperature Tso of the heat source equipment and the measured secondary side return temperature Tr2 of cold water (hot water) in the return pipe, and the measured outbound pipe and return pipe. A calorie calculation means that can be calculated from the product of the flow rate F of cold water (hot water) circulating in the pipe,
heat quantity determination means capable of determining whether or not the current required heat quantity qr of the air conditioner calculated by the heat quantity calculation means is within the range of the rated capacity of the heat source equipment;
When the heat quantity determination means determines that the required heat quantity qr of the air conditioner is within the range of the rated capacity of the heat source equipment,
outlet temperature changing means for instructing to change the outlet temperature of cold water (hot water) of the heat source equipment to a changed cold water (hot water) outlet temperature higher (lower) than the design outlet temperature Tso by 3° C. or more;
setting changing means for changing the cold water (hot water) outlet temperature of the heat source machine to the changed cold water (hot water) outlet temperature according to the instruction from the outlet temperature changing means;
fixed time determination means for determining whether or not a predetermined time has come;
When the predetermined time determination means determines that the predetermined time has come, the changed cold water (hot water) outlet temperature is lowered (raised) by a specified temperature range, and the cold water of the heat source machine is sent to the setting change means. Outlet temperature increasing/decreasing means for instructing a change to the cold water (hot water) outlet temperature after changing the (hot water) outlet temperature;
Every time the predetermined time determined by the fixed time determining means is reached, the outlet temperature increasing/decreasing means repeats the operation of decreasing (increasing) the cold water (hot water) outlet temperature of the heat source equipment within the specified temperature range. , the cold water (hot water) outlet temperature of the heat source machine is changed by the setting change means every time the predetermined time is reached,
The heat source machine of an air conditioning system, wherein the same operation is repeated until the cold water (hot water) outlet temperature after the change of the thermoelectric machine matches the design outlet temperature Tso of the heat source machine. controller. By circulating the cold water (hot water) from the heat source machine on the primary side to the air conditioner on the secondary side through the outgoing pipe and the return pipe, and heat exchange between the air introduced by the air conditioner and the cold water (hot water), In a method for controlling a heat source device of an air conditioning system that cools (heats) indoor air with the air conditioner,
A controller capable of changing the setting of the design outlet temperature Ts of the heat source equipment is provided,
In the intermediate period determined by the intermediate period/peak period determining means capable of determining whether the controller is the intermediate period or the peak period,
The heat quantity calculation means calculates the required heat quantity qr of the air conditioner as the temperature difference between the outlet temperature pTs set at the previous time of the control period of the heat source equipment and the measured secondary side return temperature Tr2 of the cold water (hot water) in the return pipe. and the product of the flow rate F of the cold water (hot water) circulating through the measured outgoing pipe and the return pipe,
a heat quantity determination means for determining whether or not the current required heat quantity qr of the air conditioner calculated by the heat quantity calculation means is within a range of rated capacity of the heat source equipment;
When the heat quantity determination means determines that the required heat quantity qr of the air conditioner is within the range of the rated capacity of the heat source equipment,
The outlet temperature calculation means sets the designed return temperature Tro to a temperature 5° C. to 7° C. higher than the design outlet temperature Tso (5° C. to 7° C. lower), and the measured flow rate is calculated as F and
Chilled water outlet temperature during cooling Ts=Tro-(qr/F)
(Hot water outlet temperature during heating Ts = Tro + (qr/F))
The cold water outlet temperature (the hot water outlet temperature) Ts is calculated by the above formula,
the outlet temperature comparing means determines whether or not the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso;
Only when the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso by 1° C. or more based on the comparison by the outlet temperature comparing means, the setting changing means changes the design outlet temperature Tso of the heat source equipment. Change the setting to the cold water (hot water) outlet temperature Ts obtained by the outlet temperature calculation means,
If the cold water (hot water) outlet temperature Ts is equal to or lower than (equal to or higher than) the design outlet temperature Tso as a result of the comparison by the outlet temperature comparing means, the setting maintaining means adjusts the design outlet temperature Tso of the heat source equipment. maintain and
A control method for a heat source machine of an air conditioning system, wherein the above operation is repeated for each control cycle. In a method for controlling a heat source device of a two-pump type air conditioning system having a primary side pump in the heat source device and a secondary side pump on the going piping side,
In the intermediate period determined by the intermediate period/peak period determining means,
The controller detects the primary side flow rate F1 of cold water (hot water) on the heat source machine side and the secondary side flow rate F2 on the air conditioner side measured by the flow rate comparison means in a stage preceding the heat amount calculation means, determining whether or not the secondary flow rate F2 is greater than the primary flow rate F1;
If the secondary flow rate F2 is greater than the primary flow rate F1 as a result of the comparison by the flow rate comparison means, the secondary flow rate increase rate calculation means calculates the rate of increase in the secondary flow rate,
The increase rate comparison means determines whether or not the increase rate of the secondary flow rate F2 calculated by the secondary flow rate increase rate calculation means is higher than a preset reference value,
When the increase rate of the secondary flow rate F2 is higher than the reference value as a result of the comparison by the increase rate comparison means, the increase rate comparison means determines that the design outlet temperature Tso of the heat source equipment is higher than the setting maintenance means. give the directive to maintain
Only when the rate of increase of the secondary-side flow rate F2 is lower than the reference value as a result of the comparison by the rate-of-increase comparison means, the rate-of-increase comparison means instructs the heat source calculation means to perform normal control. gives commands,
Only when the cold water (hot water) outlet temperature Ts is higher (lower) than the design outlet temperature Tso according to the comparison by the outlet temperature comparison means, the design outlet temperature Tso of the heat source equipment is changed by the setting changer to the outlet temperature. 5. The method of controlling a heat source machine of an air conditioning system according to claim 4, wherein the setting is changed to the cold water (hot water) outlet temperature Ts obtained by the calculating means. By circulating the cold water (hot water) from the heat source machine on the primary side to the air conditioner on the secondary side through the outgoing pipe and the return pipe, and heat exchange between the air introduced by the air conditioner and the cold water (hot water), In a method for controlling a heat source device of an air conditioning system that cools (heats) indoor air with the air conditioner,
A controller capable of changing the setting of the design outlet temperature Ts of the heat source equipment is provided,
In the peak period determined by the intermediate period/peak period determining means capable of determining whether it is the intermediate period or the peak period,
The heat quantity calculation means calculates the required heat quantity qr of the air conditioner by combining the temperature difference between the design outlet temperature Tso of the heat source equipment and the measured secondary side return temperature Tr2 of cold water (hot water) in the return pipe and the measured Calculated from the product of the flow rate F of the cold water (hot water) circulating in the outgoing pipe and the return pipe,
a heat quantity determination means for determining whether or not the current required heat quantity qr of the air conditioner calculated by the heat quantity calculation means is within a range of rated capacity of the heat source equipment;
When the heat quantity determination means determines that the required heat quantity qr of the air conditioner is within the range of the rated capacity of the heat source equipment,
The outlet temperature changing means instructs to change the cold water (hot water) outlet temperature of the heat source equipment to a changed cold water (hot water) outlet temperature higher (lower) than the design outlet temperature Tso by 3 ° C or more,
the setting changing means changes the cold water (hot water) outlet temperature of the heat source machine to the changed cold water (hot water) outlet temperature according to the instruction from the outlet temperature changing means;
The fixed time determination means determines whether or not the predetermined time has come,
When the predetermined time determining means determines that the predetermined time has come, the outlet temperature increasing/decreasing means decreases (increases) the changed cold water (hot water) outlet temperature by a specified temperature range, and the setting change means instructing to change the cold water (hot water) outlet temperature of the heat source device to the cold water (hot water) outlet temperature after changing,
The outlet temperature increasing/decreasing means repeats the operation of decreasing (increasing) the cold water (hot water) outlet temperature of the heat source machine within the specified temperature range each time the predetermined time determined by the constant time determination means is reached, The setting change means repeatedly changes the cold water (hot water) outlet temperature of the heat source machine each time the predetermined time is reached,
A control method for a heat source machine of an air conditioning system, wherein the same operation is repeated until the cold water (hot water) outlet temperature after the change of the thermoelectric machine matches the design outlet temperature Tso of the heat source machine. A program for causing a computer to function as a control device for the heat source machine of the air conditioning system according to any one of claims 1 to 3.

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