JP6092018B2 - Air conditioning system and air conditioning method - Google Patents

Description

  The present invention relates to an air conditioning system that controls the temperature of supply air to a controlled object using high-temperature cold water and low-temperature cold water.

  As this type of air conditioning system, for example, Patent Document 1 manufactures relatively high-temperature cold water (high-temperature cold water) and relatively low-temperature cold water (low-temperature cold water), and at least 2 depending on the temperature level of the cold water. There is shown an air conditioning system that controls the temperature of supply air to a controlled object by supplying high-temperature cold water and low-temperature cold water to an air conditioner via a cold water circulation system of the system.

  In this air conditioning system, as indicated by reference numeral 100 in FIG. 21, the air conditioner includes a high temperature cold water coil 101 that takes in high-temperature cold water and a low-temperature cold water coil 102 that takes in low-temperature cold water. The mixed air of the outside air OA cooled by the air and the return air RA from the controlled object is supplied to the controlled object by the fan 103 as the supply air SA.

  In this case, the high-temperature cold water coil 101 is preferentially supplied to the high-temperature cold water coil 101, and the supply air temperature cannot be set to the set value (supply temperature set value) only by the supply of the high-temperature cold water. The low temperature cold water is supplied to the low temperature cold water coil 102 together with the supply of the high temperature cold water.

  For example, when the rated flow rates of the high-temperature chilled water coil 101 and the low-temperature chilled water coil 102 are 50 l / min, the supply air temperature is set to a set value (supply temperature) even if the high-temperature chilled water supply flow rate to the high-temperature chilled water coil 101 is 50 l / min. If it cannot be set, the low temperature cold water is supplied to the low temperature cold water coil 102 while the high temperature cold water of 50 l / min is continuously supplied to the high temperature cold water coil 101.

  The amount of high temperature cold water supplied to the high temperature cold water coil 101 is controlled by controlling the opening θ1 of a valve (high temperature cold water valve) 104 provided in the high temperature cold water supply path to the high temperature cold water coil 101. Control of the supply amount of low-temperature cold water to the low-temperature cold water coil 102 is performed by controlling the opening degree θ2 of a valve (low-temperature cold water valve) 105 provided in the low-temperature cold water supply path to the low-temperature cold water coil 102.

JP-A-9-105539 (see paragraphs [0003] to [0005]).

  However, in the control of the supply amount of the high-temperature cold water and the low-temperature cold water to the conventional air conditioner 100 described above, the air conditioner 200 using only the low-temperature cold water coil 201 (however, the rated flow rate is 100 l / min) as shown in FIG. (The comparison is made assuming that the same load is covered), the sum of the high-temperature cold water to the high-temperature cold water coil 101 and the low-temperature cold water to the low-temperature cold water coil 102 is excessive compared to the cold water flow rate to the low-temperature cold water coil 201 ( (Excessive flow rate). This is because excessive high temperature cold water that does not contribute to cooling flows to the high temperature cold water coil 101 when the low temperature cold water is supplied to the low temperature cold water coil 102. In FIG. 22, 202 is a fan and 203 is a cold water valve.

  The present invention has been made to solve such problems, and the object of the present invention is to suppress the sum of high-temperature cold water and low-temperature cold water from becoming an excessive flow rate (excessive flow rate). An object is to provide an air conditioning system and an air conditioning method.

  In order to achieve such an object, the present invention generates a high temperature cold water heat source machine that generates high temperature cold water, a low temperature cold water heat source machine that generates low temperature cold water, a hot water heat source machine that generates hot water, and a high temperature cold water heat source machine. When high-temperature chilled water coil that takes in high-temperature chilled water and low-temperature chilled water generated by a low-temperature chilled water heat source or hot water generated by a hot-water heat source is used. The air conditioner having a cold / hot water coil used as a hot water coil, a high temperature cold water valve provided in a high temperature cold water supply path to the high temperature cold water coil, and a low temperature cold water or hot water supply path to the cold / hot water coil When low-temperature cold water flows through this supply path, it is used as a low-temperature cold-water valve. When hot water flows through this supply path, it is used as a hot-water valve. The air supply unit supplies air to the controlled object, while the return air from the controlled object and the outside air are mixed and supplied to the air conditioner. The air conditioner supplies the air to the controlled object. By controlling the opening degree θ1 of the high temperature cold water valve and the opening degree θ2 of the cold / hot water valve so that the temperature of the air becomes the supply air temperature setting value, the high temperature cold water to the high temperature cold water coil and the low temperature cold water to the cold water hot water coil are controlled. Alternatively, in an air conditioning system that adjusts the amount of hot water supplied, the opening degree θ1 of the high-temperature cold water valve and the opening degree θ2 of the low-temperature cold water valve are set such that the temperature of the supply air from the air conditioner to the controlled object is the supply air temperature setting value. Among them, the opening degree θ1 of the high-temperature chilled water valve is preferentially obtained, and the obtained opening degree θ1 of the high-temperature chilled water valve and the opening degree θ2 of the low-temperature chilled water valve are determined as the opening degree θ1 of the high-temperature chilled water valve for controlling the supply air temperature in summer. Low-temperature cold water valve opening θ And calculating the opening degree θ1 of the high temperature cold water valve and the opening degree θ2 of the hot water valve such that the temperature of the supply air from the air conditioner to the controlled object is the supply air temperature set value. A second calculation means for setting the opening θ1 of the high temperature cold water valve and the opening θ2 of the hot water valve as the opening θ1 of the high temperature cold water valve and the opening θ2 of the hot water valve for controlling the supply air temperature in winter, and a high temperature cold water coil The outlet temperature θ1 of the high-temperature chilled water valve is determined such that the outlet temperature of the high-temperature chilled water from the high-temperature chilled water is the high-temperature chilled water return temperature, and the high-temperature chilled water return temperature is the set value of the high-temperature chilled water return temperature. And calculating the current processing heat amount with respect to the rated cooling capacity of the air conditioner as the current processing capacity ratio of the air conditioner. Low-temperature cooling obtained by calculation means The upper limit value of the opening degree θ1 of the high-temperature chilled water valve is obtained from the water valve opening degree θ2 and the calculated current processing capacity ratio of the air conditioner. The fourth calculation means for setting the opening degree θ1 of the high-temperature chilled water valve for flow rate suppression control and the summer supply air temperature control obtained by the first calculation means when in the mode in which the chilled / hot water coil is used as the low-temperature chilled water coil The opening degree θ1 of the high-temperature chilled water valve, the opening degree θ1 of the high-temperature chilled water valve obtained by the third computing means, and the high-temperature chilled water excess flow rate suppression control obtained by the fourth computing means. It comprises minimum opening selection means for selecting, as a control output, the opening θ1 of the high-temperature cold water valve having the minimum opening among the opening θ1 of the valve.

  In the present invention, the upper limit value of the opening degree θ1 of the high temperature cold water valve is obtained from the return air from the air conditioner to the controlled object or the indoor humidity and the return air or the indoor humidity set value, and the obtained high temperature cold water valve A fifth calculation means is provided for setting the upper limit value of the opening degree θ1 as the opening degree θ1 of the high-temperature chilled water valve for the high-temperature chilled water use suppression control for maintaining the dehumidifying effect, and the minimum opening degree selecting means uses the cold / hot water coil as the low-temperature chilled water coil. When the mode is used (when the hot water is not used), the opening angle θ1 of the high temperature cold water valve for summer supply air temperature control obtained by the first calculation means, and the high temperature cold water obtained by the third calculation means To maintain the dehumidifying effect obtained by the opening degree θ1 of the high-temperature chilled water valve for return temperature control, the opening degree θ1 of the high-temperature chilled water valve for the high-temperature chilled water excess flow suppression control obtained by the fourth computing means, and the fifth computing means High-temperature cold water use suppression control Of opening θ1 cold water valve, it may be the opening to select the degree of opening θ1 hot cold water valve is minimal as the control output. When the opening degree θ1 of the high-temperature chilled water valve for controlling the use of high-temperature chilled water for maintaining the dehumidifying effect obtained by the fifth calculating means is selected as the control output, the opening degree θ1 of the high-temperature chilled water valve is limited, that is, the high temperature The flow rate of the high-temperature cold water to the cold water coil is limited, and the processing load is transferred to the low-temperature cold water, so that the dehumidifying effect is maintained.

  Further, in the present invention, when the minimum opening degree selection means is in a mode in which the cold / hot water coil is used as a hot water coil (in the hot water use mode), the high temperature of winter supply air temperature control obtained by the second calculation means is high. Of the opening degree θ1 of the chilled water valve and the opening degree θ1 of the high temperature chilled water valve of the high temperature chilled water return temperature control obtained by the third calculating means, the opening degree θ1 of the high temperature chilled water valve having the smallest opening degree is used as the control output. You may make it select.

  In the present invention, when the cold / hot water coil is in a mode of using as a hot water coil (in the hot water use mode), at least the current opening θ1 of the high-temperature cold water valve and the current opening θ2 of the hot water valve The supply air temperature control state determination means for determining the supply air temperature control state of the air conditioner, and the current supply air temperature control state of the air conditioner determined by the supply air temperature control state determination means is supplied to the air conditioner High temperature cold water set temperature changing means for changing the set temperature of the high temperature cold water may be provided. By providing such means, when the cooling capacity is insufficient due to the high-temperature cold water, it is possible to compensate for the lack of cooling capacity by lowering the high-temperature cold water set temperature. Further, when the lack of capacity is resolved, it is possible to return to the original temperature by increasing the high-temperature cold water set temperature. This makes it possible to increase the efficiency of the high-temperature cold water heat source unit while maintaining a comfortable indoor environment.

  Further, in the present invention, a high-temperature cold water heat source unit or a plurality of low-temperature cold water heat source units, and the number of operating high-temperature cold water heat source units is increased or decreased according to the current total load flow of the high-temperature cold water or the total load heat amount. When providing unit control means and low-temperature chilled water heat source operation number control means to increase or decrease the number of operating low-temperature chilled water heat source units according to the current total low-temperature chilled water load flow or total load heat quantity, If the load factor of the high-temperature chilled water heat source unit group currently in operation exceeds the load increase request determination load factor, the number of operating units control means whether or not there is a margin in the load factor of the low-temperature chilled water heat source unit group currently in operation If there is room, change the upper limit value of the hot chilled water valve opening to the current opening, and provide a high temperature chilled water heat source equipment step-up suppression means that holds the changed upper limit value until a release command is issued If you do There. In this way, when there is a margin in the load factor of the low-temperature chilled water heat source unit group that is currently in operation, the increase in the temperature of the high-temperature chilled water heat source unit is suppressed, and the efficiency of the high-temperature chilled water heat source unit due to the increased level can be avoided. . In addition, the load factor of the low-temperature chilled water heat source device increases, and the efficiency of the low-temperature chilled water heat source device increases.

  Further, in the present invention, a high-temperature cold water heat source unit or a plurality of low-temperature cold water heat source units, and the number of operating high-temperature cold water heat source units is increased or decreased according to the current total load flow of the high-temperature cold water or the total load heat amount. When providing unit control means and low-temperature chilled water heat source operation number control means to increase or decrease the number of operating low-temperature chilled water heat source units according to the current total low-temperature chilled water load flow or total load heat quantity, If there is a request to increase the number of units simultaneously from the operating unit control means and the low-temperature chilled water heat source unit operating unit control means, priority is given to increasing the number of high-temperature chilled water heat source units, and the high-temperature chilled water source operating unit control unit and the low-temperature chilled water source unit. It is preferable to provide a simultaneous increase / decrease stage suppression means for preferentially executing the step decrease of the low-temperature chilled water heat source unit when there is a step decrease request simultaneously from the operating number control means. In this way, when there is a request to increase the number of high-temperature chilled water heat source units and low-temperature chilled water heat source units at the same time, efficient high-temperature chilled water source units are added first, and then the number of low-temperature chilled water source units increases. Stepped. In addition, if there is a request to reduce the temperature at the same time for the high-temperature chilled water heat source and the low-temperature chilled water source, the low-efficiency low-temperature chilled water source is reduced first, and then the high-temperature chilled water source is reduced. . Thereby, it becomes possible to reduce the influence of disturbance on the supply air temperature control of the air conditioner due to the fluctuation of the water supply temperature generated at the time of increasing or decreasing the stage.

  According to the present invention, the current processing heat amount with respect to the rated cooling capacity of the air conditioner is calculated as the current processing capacity ratio of the air conditioner, and is calculated as the opening degree θ2 of the low-temperature chilled water valve obtained by the first calculation means. The upper limit value of the opening degree θ1 of the high-temperature chilled water valve is obtained from the current processing capacity ratio of the air conditioner, and the upper limit value of the obtained opening degree θ1 of the high-temperature chilled water valve is calculated as the opening degree of the high-temperature chilled water excessive flow suppression control. Since the fourth calculation means for setting θ1 is provided, when the low-temperature cold water is supplied to the low-temperature cold water coil, excessive flow of the high-temperature cold water to the high-temperature cold water coil is suppressed, and the sum of the high-temperature cold water and the low-temperature cold water is excessive. It becomes possible to suppress (overflow rate).

It is an instrumentation figure showing one embodiment of an air-conditioning system concerning the present invention. It is an instrumentation diagram between the air conditioner controller and the air conditioner in this air conditioning system. It is a functional block diagram of the principal part of an air conditioner controller. It is a figure which shows the relationship between the valve opening degree of a two-way valve, and a valve passage flow rate. It is a figure which shows the table used for the summer supply air temperature control. It is a figure which shows the table used for the winter supply air temperature control. It is a figure which shows the table used for high temperature cold water return temperature control. It is a figure which shows the table used for high temperature cold water excessive flow volume suppression control. It is a figure which shows the table used for high temperature cold water utilization suppression control for dehumidification effect maintenance. It is a figure which extracts and shows the functional block which judges the control state of the supply air temperature at the time of warm water use mode in an air conditioner controller. It is a figure which shows the name obtained as a judgment result of the control state of the supply air temperature at the time of warm water use mode in an air conditioner controller, and its content. It is a figure which shows the judgment logic of the control state of the supply air temperature at the time of warm water use mode in an air conditioner controller. It is a figure which shows the determination logic of the correction value of the high temperature cold water supply temperature in a high temperature cold water preset temperature change apparatus. It is a figure explaining the increase / decrease stage function of the low temperature chilled water heat source controller of a low temperature chilled water heat source controller and a high temperature chilled water heat source controller before adding the function which suppresses the increase stage of a high temperature chilled water heat source unit to a high temperature chilled water heat source controller . It is a figure explaining the increase / decrease stage function of the low temperature chilled water heat source controller of the low temperature chilled water heat source controller and the high temperature chilled water heat source controller and the high temperature chilled water heat source controller after adding the function of suppressing the increase in the number of high temperature chilled water heat source devices to the high temperature chilled water heat source controller . It is a figure which shows the relationship between ON / OFF of the load factor of a high temperature cold water heat source machine, COP (coefficient of performance), stage increase request | requirement (pre), and high temperature cold water valve upper limit holding mode. It is a figure which shows the relationship between the load factor of a low-temperature cold-water heat source machine, COP (coefficient of performance), and ON / OFF of a high temperature cold-water valve upper limit retention mode. It is a flowchart which shows operation | movement of the stage increase suppression part in a high temperature cold water heat source controller. It is a flowchart for demonstrating the simultaneous stage | step increase suppression operation | movement in a heat source integrated controller. It is a flowchart for demonstrating the simultaneous stage | step reduction suppression operation | movement in a heat source integrated controller. It is a figure which shows the principal part of the air conditioner using a high temperature cold water coil and a low temperature cold water coil. It is a figure which shows the principal part of the air conditioner using only a low temperature cold water coil.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an instrumentation diagram showing an embodiment of an air conditioning system according to the present invention.

  In the figure, 1-1 to 1-4 are low-temperature / high-temperature cold water heat source devices that generate low-temperature cold water or high-temperature cold water, 2-1 and 2-2 are hot-water heat source devices that generate hot water, and 3-1 to 3-4. Is a primary pump provided as an auxiliary machine for the low temperature / high temperature cold water heat source equipment 1-1 to 1-4, and 3-5 and 3-6 are auxiliary equipment for the hot water heat source equipment 2-1 and 2-2. Primary pumps, 4-1, 4-2, 5-1 and 5-2 are forward headers, 6-1, 6-2, 7-1 and 7-2 are return headers, and 8-1 is A bypass conduit provided between the forward header 4-1 and the return header 6-1, and a bypass conduit 8-2 is provided between the forward header 5-1 and the return header 7-1.

  9-1 to 9-3 are secondary pumps provided between the forward headers 4-1 and 4-2, and 9-4 to 9-6 are provided between the forward headers 5-1 and 5-2. The secondary pump, 10-1 is a bypass valve provided in the bypass line between the forward headers 4-1 and 4-2, and 10-2 is between the forward headers 5-1 and 5-2. A bypass valve provided in the bypass line, 11 is a first water line that communicates with the forward header 4-2, 12 is a second water line that communicates with the forward header 5-2, and 13 is a return header 6- 1 is a first return water line communicating with the return header 7-2, 14 is a second return water line communicating with the return header 7-2, and 15-1 to 15-3 are between the return water line 11 and the return water line 13 and It is an air conditioner provided in parallel between the water pipe 12 and the return water pipe 14.

  The air conditioner 15 (15-1 to 15-3) includes a cold / hot water coil 15A, a high-temperature cold water coil 15B, and a fan 15C. The cold / hot water coil 15A is connected to the outgoing water line 11 and the return water line 13. A high-temperature cold water coil 15 </ b> B is provided between the outgoing water pipe 12 and the return water pipe 14. A cold / hot water valve CHV is provided in the cold / hot water supply path to the cold / hot water coil 15A, and a high-temperature cold water valve HCV is provided in the high-temperature cold water supply path to the high-temperature cold water coil 15B.

  In this air conditioning system, the cold water (low temperature cold water or high temperature cold water) generated by the low temperature / high temperature cold water heat source devices 1-1 to 1-4 is sent to the forward headers 4-1 and 5-1, Valves 17-1 to 17-4 are provided in the cold water supply path from the high-temperature cold water heat source devices 1-1 to 1-4 to the forward header 4-1, and the low-temperature / high-temperature cold water heat source devices 1-1 to 1- Valves 17-5 to 17-8 are provided in the cold water supply path from 4 to the forward header 5-1. Further, similarly to the outgoing water side, the return water side also has valves 18-1 to 18-4 on the return path of the cold water from the return header 6-1 to the low temperature / high temperature cold water heat source units 1-1 to 1-4. Are provided, and valves 18-5 to 18-8 are provided in the cold water return path from the return header 7-1 to the low temperature / high temperature cold water heat source units 1-1 to 1-4.

  The hot water generated by the hot water heat source devices 2-1 and 2-2 is sent to the forward header 4-1, and the hot water heat source devices 2-1 and 2-2 send the warm water to the forward header 4-1. Valves 19-1 and 19-2 are provided in the hot water supply path. In addition, valves 20-1 and 20-2 are provided on the return path of the warm water from the return header 6-1 to the warm water heat source units 2-1 and 2-2 on the return water side in the same manner as the outgoing water side. ing.

  In this air conditioning system, the low-temperature / high-temperature chilled water heat source units 1-1 to 1-4 are provided with a low-temperature chilled water heat source controller 21 and a high-temperature chilled water heat source controller 22, and the hot-water heat source units 2-1 and 2- 2, a hot water heat source controller 23 is provided. A heat source integrated controller 24 is provided for the low temperature cold water heat source controller 21, the high temperature cold water heat source controller 22, and the hot water heat source controller 23.

  The low-temperature cold water heat source controller 21 sends the operation command to the low-temperature / high-temperature cold water heat source unit 1 (1-1 to 1-4), thereby operating the required low-temperature / high-temperature cold water heat source unit 1 as a low-temperature cold water heat source unit. Make it work. Hereinafter, a low-temperature / high-temperature cold water heat source machine that operates as a low-temperature cold water heat source machine is referred to as a low-temperature cold water heat source machine.

  The low-temperature cold water heat source controller 21 supplies the low-temperature cold water from the low-temperature cold water heat source unit 1 in operation to the forward header 4-1, so that the low-temperature cold water source 1 sends the low-temperature cold water to the forward header 4-1. Open the valve 17 (17-1 to 17-4) provided in Further, similarly to the outgoing water side, on the return water side, a valve 18 (18-1 to 18-4) provided in the return path of the low temperature cold water from the return header 6-1 to the low temperature cold water heat source unit 1 is also provided. ) Is also open. The low-temperature / high-temperature cold water heat source unit 1 operates as a low-temperature cold water heat source unit by setting the cold water temperature set value to a low value (relatively low value).

  The high temperature cold water heat source controller 22 sends an operation command to the low temperature / high temperature cold water heat source unit 1 (1-1 to 1-4), thereby operating the required low temperature / high temperature cold water heat source unit 1 as a high temperature cold water heat source unit. Make it work. Hereinafter, a low temperature / high temperature cold water heat source machine that operates as a high temperature cold water heat source machine is referred to as a high temperature cold water heat source machine.

  The high-temperature cold water heat source controller 22 supplies the high-temperature cold water from the high-temperature cold water heat source unit 1 in operation to the forward header 5-1, so that the high-temperature cold water heat source device 1 supplies the high-temperature cold water to the forward header 5-1. The valve 17 (17-5 to 17-8) provided in the above is opened. Further, similarly to the outgoing water side, the return water side also has a valve 18 (18-5 to 18-8) provided in the return path of the high temperature cold water from the return header 7-1 to the high temperature cold water heat source unit 1. ) Is also open. The low temperature / high temperature cold water heat source unit 1 operates as a high temperature cold water heat source unit when the cold water temperature set value is set to a high value (relatively high value).

  The hot water heat source controller 23 sets the required hot water heat source unit 2 in operation by sending an operation command to the hot water heat source unit 2 (2-1, 2-2). In this case, the hot water heat source controller 23 uses a hot water supply path from the hot water heat source device 2 to the forward header 4-1 to send the warm water from the hot water / cold water heat source device 2 in operation to the forward header 4-1. The provided valves 19 (19-1, 19-2) are opened. Moreover, the valve 20 (20-1, 20-2) provided in the return route of the warm water from the return header 6-1 to the warm water heat source machine 2 is also provided on the return water side as in the outgoing water side. Open.

  In this air conditioning system, for example, when the low temperature / high temperature chilled water heat source device 1-1 is a low temperature chilled water heat source device, the low temperature chilled water generated by the low temperature chilled water heat source device 1-1 is supplemented to the low temperature chilled water heat source device 1-1. The pump is pumped by the primary pump 3-1 activated as a machine, sent to the forward header 4-1 through the valve 17-1, and further pumped by the secondary pumps 9-1 to 9-3. -2 is supplied to the outgoing water line 11, passes through the cold / hot water coil 15 </ b> A of the air conditioner 15, passes through the cold / hot water valve CHV, passes through the return water pipe 13, and reaches the return headers 6-2 and 6-1. It is pumped by the primary pump 3-1 through 18-1, and circulates through the above path. In this case, in the air conditioner 15, the cold / hot water coil 15A is used as a low temperature cold water coil, and the cold / hot water valve CHV is used as a low temperature cold water valve.

  Further, for example, when the low temperature / high temperature cold water heat source machine 1-2 is a high temperature cold water heat source machine, the high temperature cold water generated by the high temperature cold water heat source machine 1-2 is started as an auxiliary machine of the high temperature cold water heat source machine 1-2. Pressure pumped by the primary pump 3-2, sent to the forward header 5-1 through the valve 17-6, further pumped by the secondary pumps 9-4 to 9-6, Then, it is supplied to the outgoing water line 12, passes through the high temperature cold water coil 15B of the air conditioner 15, passes through the high temperature cold water valve HCV, passes through the return water line 14 and reaches the return headers 7-2, 7-1, and the valve 18-6. Then, it is again pumped by the primary pump 3-2 and circulates in the above path.

  In addition, for example, when the hot water heat source device 2-1 is in operation, the hot water generated by the hot water heat source device 2-1 is activated as an auxiliary machine of the hot water heat source device 2-1. , Is sent to the forward header 4-1 through the valve 19-1, further pumped by the secondary pumps 9-1 to 9-3, and supplied to the forward water line 11 via the forward header 4-2. , Passes through the cold / hot water coil 15A of the air conditioner 15, passes through the cold / hot water valve CHV, passes through the return water line 13, reaches the return headers 6-2 and 6-1, and passes through the valve 20-1 again to the primary pump. It is pumped by 3-5 and circulates through the above path. In this case, in the air conditioner 15, the cold / hot water coil 15A is used as the hot water coil, and the cold / hot water valve CHV is used as the hot water valve.

In the circulation path of the low-temperature cold water, high-temperature cold water, and hot water, the temperature of the cold / hot water (low-temperature cold water or hot water) discharged from the forward header 4-2 is sent to the air conditioners 15-1 to 15-3 in the outgoing water line 11.往水temperature sensor 25 for detecting a往水temperature t _CHWS of hot and cold water are provided for, the Kaemizu conduit 13, instead of the hot and cold water to be returned to the header 6-2 conditioning the temperature of the (low-temperature cold water or hot water) machine 15 and Kaemizu temperature sensor 26 for detecting a Kaemizu temperature t _CHWR of hot and cold water from -1～15-3, instead hot and cold water to be returned to the header 6-2 (low temperature cold or hot water) flow air conditioners 15-1 A total flow rate of cold / hot water passing through -15-3 (cold / warm water total load flow rate) Q _{CHW to} be detected as _CHW is provided.

In addition, a water temperature sensor 28 that detects the temperature of the high-temperature cold water discharged from the forward header 5-2 as a temperature t _HCWS of the high-temperature cold water to the air conditioners 15-1 to 15-3 is provided in the _outward water pipe 12. The return water pipe 14 detects the temperature of the high temperature cold water returned to the return header 7-2 as the return temperature t _HCWR of the high temperature cold water from the air conditioners 15-1 to 15-3. 29 and a flow meter 30 for detecting the flow rate of the high-temperature cold water returned to the return header 7-2 as the total flow rate (high-temperature cold water total load flow rate) Q _HCW passing through the air conditioners 15-1 to 15-3. ing.

  In this air conditioning system, air conditioner controllers 16-1 to 16-3 are provided for the air conditioners 15-1 to 15-3. FIG. 2 shows an instrumentation diagram between the air conditioner controller 16 (16-1 to 16-3) and the air conditioner 15 (15-1 to 15-3). In FIG. 2, the high-temperature cold water coil 15B, the cold / hot water coil 15A, and the fan 15C are arranged along the flow direction of the mixed air of the return air RA and the outside air OA. Although installed in order, the fan 15C, the high-temperature cold water coil 15B, and the cold / hot water coil 15A may be installed in this order.

  The air conditioner 15 takes the mixed air of the return air RA and the outside air OA from the control object as intake air, adjusts the temperature of the mixed air supplied as this intake air by the cold / hot water coil 15A and the high temperature cold water coil 15B, and from the fan 15C. By exhaling, it supplies to control object as supply air SA.

  In the supply path of the supply air SA from the air conditioner 15, the supply air temperature sensor 31 that detects the temperature of the supply air SA as the supply air temperature tspv to the control target, and the humidity of the supply air SA to the control target An air supply humidity sensor 32 that detects the humidity hspv and an air supply air volume sensor 33 that detects the air volume of the supply air SA as the air supply air volume Vair to the control target are provided. However, instead of the supply air humidity sensor 32, a supply air dew point temperature sensor that detects the dew point temperature of the supply air SA as the supply air dew point temperature dspv to the control target may be used.

  Further, an intake air temperature sensor that detects the temperature of the mixed air of the outside air OA and the return air RA as the intake air temperature tmpv to the air conditioner 15 is provided in the supply path of the mixture air of the outside air OA and the return air RA to the air conditioner 15. 34, an intake air humidity sensor 35 that detects the humidity of the mixed air of the outside air OA and the return air RA as the intake air humidity hmpv to the air conditioner 15, and the humidity of the return air RA to the mixed air of the outside air OA and the return air RA And a return air humidity sensor 38 for detecting the return air humidity hrpv.

For the high temperature chilled water coil 15B of the air conditioner 15, a temperature sensor 36 that detects the inlet temperature of the high temperature chilled water to the high temperature chilled water coil 15B as the high temperature chilled water feed temperature t _HCWS pv and the high temperature chilled water from the high temperature chilled water coil 15B. And a temperature sensor 37 for detecting the outlet temperature of the water as a high temperature cold water return temperature t _HCWR pv. Further, a temperature sensor 39 is provided for the cold / hot water coil 15A of the air conditioner 15 to detect the outlet temperature of the cold / hot water from the cold / hot water coil 15A as the cold / _warm water return temperature t _CHWR pv.

The air conditioner controller 16 includes an air supply temperature tspv from the air supply temperature sensor 31, an air supply humidity hspv from the air supply humidity sensor 32, an air supply air volume Vair from the air supply air volume sensor 33, and an intake air temperature sensor 34. Intake air temperature tmpv, intake air humidity hmpv from intake air humidity sensor 35, return air humidity hrpv from humidity sensor 38, high temperature cold water flow temperature t _HCWS pv from temperature sensor 36, and high temperature cold water return from temperature sensor 37 With _{respect to} temperature t _HCWR pv, cold water return temperature t _CHWR pv from temperature sensor 39, temperature set value (supply temperature set value) tssp determined for supply air temperature tspv, and return air humidity hrpv The specified humidity setting value (return air humidity setting value) hrsp and the temperature setting value (high temperature cold water return temperature setting value) t _HCWR sp determined for the high temperature cold water return temperature t _HCWR pv are input. Valve CHV and high temperature The opening degree of the cold water valve HCV is controlled.

  FIG. 3 shows a functional block diagram of the main part of the air conditioner controller 16. In the figure, 16A is a summer supply air temperature control unit (first operation unit), 16B is a winter supply air temperature control unit (second operation unit), and 16C is a high-temperature cold water return temperature control unit (third operation unit). , 16D is a high-temperature cold water excess flow rate suppression control unit (fourth calculation unit), 16E is a high-temperature cold water use suppression control unit (fifth calculation unit) for maintaining the dehumidification effect, 16G is a summer / winter switching unit for θ2, and 16H is θ1 The summer / winter switching section, 16I and 16J are low selector sections, and 16K and 16L are gate sections.

  Each unit of the air conditioner controller 16 is realized by hardware including a processor and a storage device, and a program that realizes various functions in cooperation with the hardware. Specifically, the program is installed in the computer, and the processing operation of the CPU according to the installed program is realized.

  Hereinafter, the function of each part of the air conditioner controller 16 shown in FIG. 3 will be described with the operation thereof. In this embodiment, the cold / hot water valve CHV and the high-temperature cold water valve HCV attached to the air conditioner 15 are two-way valves, and the relationship between the valve opening (0 to 100%) and the valve passage flow rate is equal. It is assumed to be represented by a percentage characteristic (see FIG. 4). In this embodiment, the rated flow rates of the cold / hot water coil 15A and the high-temperature cold water coil 15B are 50 l / min, respectively.

[Summer supply air temperature control]
The summer supply air temperature control unit (first arithmetic unit) 16A receives the supply air temperature tspv from the supply air temperature sensor 31 and the supply air temperature set value tssp for the supply air temperature tspv as shown in FIG. The opening degree θ1 of the high-temperature chilled water valve and the opening degree θ2 of the low-temperature chilled water valve are determined with priority given to the opening degree θ1 of the high-temperature chilled water valve so that the supply air temperature tspv is set to the supply air temperature set value tssp. The obtained opening degree θ1 of the high-temperature chilled water valve and opening degree θ2 of the low-temperature chilled water valve are output as the opening degree θ1 of the high-temperature chilled water valve and the opening degree θ2 of the low-temperature chilled water valve in the summer air supply temperature control. In addition, since the hot water is not used in the supply air temperature control in the summer, the opening degree of the hot water valve is not determined in the table TB1.

[Air supply temperature control in winter]
The supply air temperature control unit (second calculation unit) 16B in winter receives the supply air temperature tspv from the supply air temperature sensor 31 and the supply air temperature set value tssp for the supply air temperature tspv as shown in FIG. The high-temperature cold water valve opening θ1 and the hot water valve opening θ2 such that the supply air temperature tspv is set to the supply air temperature set value tssp are obtained according to the table TB2, and the obtained high-temperature cold water valve opening θ1 and hot water are obtained. The opening degree θ2 of the valve is output as the opening degree θ1 of the high-temperature cold water valve and the opening degree θ2 of the hot water valve for the supply air temperature control in winter. In addition, since the low temperature cold water is not used in the supply air temperature control in winter, the opening degree of the low temperature cold water valve is not defined in the table TB2.

[High temperature cold water return temperature control]
The high temperature cold water return temperature control unit (third arithmetic unit) 16C receives the high temperature cold water return temperature t _HCWR pv from the temperature sensor 37 and the high temperature cold water return temperature set value t _HCWR sp for the high temperature cold water return temperature t _HCWR pv. Then, according to the table TB3 as shown in FIG. 7, the opening degree θ1 of the high temperature cold water valve is determined so that the high temperature cold water return temperature t _HCWR pv _{becomes the} high temperature cold water return temperature set value t _HCWR sp. The degree θ1 is output as the opening degree θ1 of the high-temperature cold water valve for high-temperature cold water return temperature control.

(High-temperature cold water excessive flow suppression control)
The high temperature / cold water excessive flow rate suppression control unit (fourth calculation unit) 16D includes an intake air temperature tmpv from the intake air temperature sensor 34, an intake air humidity hmpv from the intake air humidity sensor 35, and an intake air temperature tspv from the intake air temperature sensor 31. The air supply humidity hspv from the air supply humidity sensor 32, the air supply air volume Vair from the air supply air volume sensor 33, and the opening degree θ2 of the low-temperature cold water valve from the summer / winter switching unit 16G of θ2 described later (or the hot water valve) The current processing heat amount with respect to the rated cooling capacity of the air conditioner 15 is calculated as a current processing capacity ratio p (%) of the air conditioner 15, and the summer of θ2 is calculated according to the table TB4 shown in FIG. From the opening degree θ2 of the low temperature cold water valve (or the opening degree θ2 of the hot water valve) from the winter switching unit 16G and the current processing capacity ratio p (%) of the air conditioner 15, the upper limit value θ1max of the opening degree θ1 of the high temperature cold water valve is determined. Seeking And it outputs the obtained upper limit value θ1max opening θ1 hot cold water valve as opening θ1 hot cold water valve of the hot-cold water over flow suppression control.

[High-temperature cold water use control to maintain dehumidification effect]
The high temperature cold water use suppression control unit (fifth calculation unit) 16E for maintaining the dehumidifying effect receives the return air humidity hrpv from the return air humidity sensor 38 and the return air humidity set value hrsp for the return air humidity hrpv, According to the table TB5 as shown in FIG. 9, the upper limit value θ1max of the opening degree θ1 of the high temperature cold water valve corresponding to the current return air humidity hrpv is obtained, and the obtained upper limit value θ1max of the opening degree θ1 of the high temperature cold water valve is determined as the dehumidifying effect. It is output as the opening degree θ1 of the high temperature cold water valve of the high temperature cold water use suppression control for maintenance. Hereinafter, the high temperature cold water use suppression control unit 16E for maintaining the dehumidifying effect is simply referred to as a high temperature cold water use suppression control unit 1E.

[Θ2 summer / winter switching]
The summer / winter switching unit 16G for θ2 receives the opening degree θ2 of the hot water valve from the supply air temperature control unit 16B in winter and the opening degree θ2 of the low-temperature cold water valve from the supply air temperature control unit 16A in summer and gives it from the outside In response to the information on whether the hot water is used / not used, that is, whether the cold / hot water coil 15A in the air conditioner 15 is in a mode in which it is used as a hot water coil (hot water usage mode) or in a mode in which it is used as a low temperature cold water coil (not in hot water) In the warm water use mode, the warm water valve opening θ2 from the supply air temperature control unit 16B is selectively output in the warm water use mode, and the low temperature from the summer supply air temperature control unit 16A in the hot water non-use mode. Selects and outputs the opening degree θ2 of the cold water valve.

[Θ1 summer / winter switching]
The θ1 summer-winter switching unit 16H receives the opening degree θ1 of the high-temperature chilled water valve from the winter supply air temperature control unit 16B and the opening degree θ1 of the high-temperature chilled water valve from the summer supply air temperature control unit 16A. In response to the information on whether or not the hot water is used, whether it is in a mode in which the cold / hot water coil 15A in the air conditioner 15 is used as a hot water coil (hot water usage mode) or in a mode in which it is used as a low temperature cold water coil ( In the warm water use mode, the opening temperature θ1 of the high temperature cold water valve from the supply air temperature control unit 16B is selectively output in the warm water use mode, and in the summer water supply temperature control unit 16A in the hot water unused mode. Is used to selectively output the opening degree θ1 of the high-temperature cold water valve.

  Information on whether hot water is used / not used from the outside is also given to the gate portions 16L and 16K. The gate portions 16L and 16K close the gate in the hot water use mode and open the gate in the hot water non-use mode. When the gate of the gate portion 16L is opened, the opening degree θ1 of the high temperature cold water valve from the high temperature cold water excessive flow suppression control unit 16D passes through the gate portion 16L, and when the gate of the gate portion 16K is opened, the high temperature cold water use suppression control is performed. The opening degree θ1 of the high temperature cold water valve from the part 16E passes through the gate part 16K.

[Low Select]
The low selector unit 16I includes the opening degree θ1 of the high temperature cold water valve from the summer / winter switching unit 16H of θ1, the opening degree θ1 of the high temperature cold water valve from the high temperature cold water return temperature control unit 16C, and the gate from the high temperature cold water use suppression control unit 16E. The opening degree θ1 of the high-temperature chilled water valve via the section 16K is input, and the opening degree θ1 of the high-temperature chilled water valve having the smallest opening degree among the inputted opening degree θ1 of the high-temperature chilled water valve is selectively output.

  The low selector unit 16J receives and inputs the opening degree θ1 of the high temperature cold water valve from the low selector unit 16I and the opening degree θ1 of the high temperature cold water valve via the gate unit 16L from the high temperature cold water excessive flow suppression control unit 16D. Of the opening θ1 of the high-temperature chilled water valve, the opening θ1 of the high-temperature chilled water valve having the smallest opening is selected and output.

  In this embodiment, the θ1 summer / winter switching section 16H, the low selector sections 16I and 16J, and the gate sections 16K and 16L constitute the minimum opening selection means in the present invention. In this embodiment, the minimum opening is selected in a two-stage configuration of the low selector units 16I and 16J. However, the low selector units 16I and 16J may be combined into one low selector unit.

[Hot water unused mode]
Now, it is assumed that hot water unused information (hot water unused mode) is given to the air conditioner controller 16 from the outside.
In this case, the summer / winter switching unit 16G of θ2 receives and outputs information on unused hot water from the outside, and selectively outputs the opening θ2 of the low-temperature chilled water valve from the summer supply air temperature control unit 16A.
Further, the opening degree θ2 of the low temperature cold water valve from the supply air temperature control unit 16A in the summer is sent from the summer / winter switching unit 16G of θ2 to the high temperature cold water excess flow rate suppression control unit 16D.

  The summer / winter switching unit 16H for θ1 receives information on the unused hot water from the outside, selects the opening θ1 of the high-temperature cold water valve from the supply air temperature control unit 16A in the summer, and sends it to the low selector unit 16I. The low selector section 16I is also supplied with the opening degree θ1 of the high-temperature cold water valve from the high-temperature cold water return temperature control section 16C. In addition, since the gate unit 16K opens the gate in response to information on unused hot water from the outside, the opening degree θ1 of the high temperature cold water valve from the high temperature cold water use suppression control unit 16E is also sent to the low selector unit 16I. .

  The low selector unit 16I is configured such that the opening degree θ1 of the high temperature hot / cold water valve sent from the summer / winter switching unit 16H of θ1 (the opening degree θ1 of the high temperature cold water valve from the supply air temperature control unit 16A in summer), the high temperature cold water return temperature. Of the opening degree θ1 of the high-temperature chilled water valve sent from the control unit 16C and the opening degree θ1 of the high-temperature chilled water valve sent from the high-temperature chilled water use suppression control unit 16E, the opening of the high-temperature chilled water valve with the smallest opening degree is opened. The degree θ1 is selected and sent to the row selector 16J.

  On the other hand, the high-temperature chilled water excess flow rate suppression control unit 16D calculates the current processing heat amount with respect to the rated cooling capacity of the air conditioner 15 as the current processing capacity ratio p (%) of the air conditioner 15, and according to the table TB4 shown in FIG. , Θ2 opening degree θ2 of the low temperature cold water valve from the summer / winter switching unit 16G (opening angle θ2 of the low temperature cold water valve from the summer air supply temperature control unit 16A) and the current processing capacity ratio p (%) of the air conditioner 15 From this, the upper limit value θ1max of the opening degree θ1 of the high temperature chilled water valve is obtained, and the obtained upper limit value θ1max of the opening degree θ1 of the high temperature chilled water valve is output as the opening degree θ1 of the high temperature chilled water excessive flow suppression control.

  In this case, the high temperature / cold water excess flow rate suppression control unit 16D obtains the outside air / return air mixing point enthalpy from the intake air temperature tmpv from the intake air temperature sensor 34 and the intake air humidity hmpv from the intake air humidity sensor 35, and from the supply air temperature sensor 31. The supply air enthalpy is obtained from the supply air temperature tspv and the supply air humidity hspv from the supply air humidity sensor 32, the outside air / return air mixing point enthalpy, the supply air enthalpy, and the supply air volume Vair from the supply air volume sensor 33. From the following, the current processing heat quantity of the air conditioner 15 is obtained by the following equation (1).

Process heat [kJ / h] = (Outside air / return air mixing point enthalpy [kJ / kg] −Supply enthalpy [kJ / kg]) × Air volume [m ³ / h] × Specific gravity [1.2 kg / m ³ ] ... (1)

  In this embodiment, as an example, the supply air volume Vair is actually measured by the air volume sensor 33. However, the supply air volume Vair may be obtained from the inverter output INV to the fan 15C.

  In addition, when a VAV (variable air volume adjusting unit) is installed in the air supply duct of the air conditioner 15, the duct resistance changes depending on the opening state of the VAV damper or the like. The total value of the VAV air volume may be used as the air volume. Further, when the VAV is not installed in the air supply duct of the air conditioner 15, it is considered that the duct resistance does not change, and the air supply fan inverter rotational speed may be used as a ratio with the rated air volume.

The high-temperature chilled water excess flow rate suppression control unit 16D obtains the current processing heat amount of the air conditioner 15 by the above equation (1), and then calculates the sum of the rated cooling capacities of the high-temperature chilled water coil and the low-temperature chilled water coil. And the current processing capacity ratio p (%) of the air conditioner 15 is obtained by the following equation (2).
Processing capacity ratio p (%) = processing heat amount ÷ total rated cooling capacity of high-temperature chilled water coil and low-temperature chilled water coil (2)

  Then, the high-temperature chilled water excess flow rate suppression control unit 16D has the opening degree θ2 of the low-temperature chilled water valve from the summer-winter switching unit 16G for θ2 (the opening degree θ2 of the low-temperature chilled water valve from the supply air temperature control unit 16A in summer) and the above ( The upper limit value θ1max of the opening degree θ1 of the high-temperature cold water valve is obtained from the current processing capacity ratio p (%) of the air conditioner 15 obtained by the equation 2) according to the table TB4 shown in FIG.

The process for obtaining the upper limit value θ1max of the opening degree θ1 of the high-temperature cold water valve according to this table TB4 corresponds to performing the calculation represented by the following expression (3) when p = 0 to 100%.
θ1max = (treatment capacity ratio (p%) × 2) −opening of low-temperature cold water valve (θ2) (3)

  According to the equation (3), for example, when the processing capacity ratio p (%) of the air conditioner 15 is 50% and the opening degree θ2 of the low temperature chilled water valve is 75%, the upper limit value θ1max of the opening degree θ1 of the high temperature chilled water valve. Is obtained as θ1max = (processing capacity ratio (50%) × 2—opening degree of low-temperature cold water valve (75%) = 25%.

  The high temperature chilled water excess flow rate suppression control unit 16D outputs the upper limit value θ1max of the opening degree θ1 of the high temperature chilled water valve thus obtained as the opening degree θ1 of the high temperature chilled water excessive flow rate suppression control. In this case, since the gate unit 16L opens the gate in response to information on the unused hot water from the outside, the opening degree θ1 of the high temperature cold water excessive flow suppression control from the high temperature cold water excessive flow rate suppression control unit 16D is low. It is sent to the selector unit 16J.

  The low selector unit 16J receives the opening degree θ1 of the high temperature cold water valve from the low selector unit 16I and the opening degree θ1 of the high temperature cold water valve from the high temperature cold water excessive flow suppression control unit 16D, and opens the two high temperature cold water valves. Of the degree θ1, the opening degree θ1 of the high temperature cold water valve having the smallest opening degree is selectively output.

  The air conditioner controller 16 uses the opening degree θ1 of the high temperature cold water valve selected and output by the low selector section 16J as a control output to the high temperature cold water valve HCV. Further, the opening degree θ2 of the low-temperature chilled water valve (the opening degree θ2 of the low-temperature chilled water valve from the supply air temperature control unit 16A in summer) output from the summer / winter switching unit 16G of θ2 is transferred to the chilled / hot water valve (low-temperature chilled water valve) CHV. Control output.

  Here, if the opening degree θ1 of the high-temperature chilled water excess flow rate suppression control obtained by the high-temperature chilled water excess flow rate suppression control unit 16D is the minimum, the opening degree θ1 of the high-temperature chilled water excess flow rate suppression control is high. Is selected as the control output. The opening degree θ1 of the high temperature chilled water excessive flow suppression control selected as the control output is the opening degree θ2 of the low temperature chilled water valve obtained by the summer supply air temperature control unit 16A and the current processing of the air conditioner 15. The upper limit value θ1max of the opening degree θ1 of the high-temperature chilled water valve obtained from the capacity ratio p (%), and the opening degree θ1 of the high-temperature chilled water valve HCV is limited by the upper limit value θ1max.

  Thereby, when supplying the low temperature cold water to the cold / hot water coil (low temperature cold water coil) 15A, excessive flow of the high temperature cold water to the high temperature cold water coil 15B is suppressed, and the sum of the high temperature cold water and the low temperature cold water is excessive. ) Is suppressed.

  When the opening degree θ1 of the high temperature cold water valve from the high temperature cold water use suppression control unit 16E is selected as the control output in the low selector unit 16J, the high temperature cold water use suppression control for maintaining the dehumidification effect is applied. Thereby, the flow rate of the high-temperature cold water to the high-temperature cold-water coil 15B is limited, the processing load is transferred to the low-temperature cold water, and the dehumidifying effect is maintained.

  When high-temperature cold water and low-temperature cold water are used, the supply air temperature is satisfied by giving priority to the high-temperature cold water, but the dehumidification may be insufficient, and the high-humidity state may continue. Such a situation is likely to occur when the air volume of the air conditioner is the rated air volume. Therefore, in the present embodiment, the flow rate of the high-temperature cold water is limited according to the dehumidifying capacity (result) of the high-temperature cold water (if the humidity cannot satisfy the humidity setting, the opening degree θ1 of the high-temperature cold water valve is limited). ) (See FIG. 9), the dehumidifying effect is maintained by shifting the processing load to low-temperature cold water.

  As a precaution during mounting, there is a case where the supply air temperature cannot be satisfied by limiting the opening degree θ1 of the high-temperature cold water valve. Therefore, it is necessary to set the upper limit value θ1max to the extent that the supply air temperature can be satisfied. . Moreover, since the high temperature cold water use suppression control for maintaining the dehumidifying effect performs a proportional integral operation, when the low temperature cold water cannot be supplied to the air conditioner, if the humidity rises, the upper limit value θ1max is lowered, so the supply air temperature is also reduced. May rise. For this reason, it is set as the conditions of control permission that the low-temperature cold-water system is working normally. For example, the condition is that the temperature of the low-temperature chilled water is equal to or less than the set value ± 1.5 ° C., and that the high-temperature chilled water heat source and the low-temperature chilled water heat source are not within a certain time from the stage increase and decrease operations.

  Further, in the low selector unit 16J, when the opening degree θ1 of the high temperature cold water return temperature control unit 16C from the high temperature cold water return temperature control unit 16C is selectively output, control is performed such that the high temperature cold water return temperature control becomes a set value. This prevents the temperature difference of the high-temperature cold water from deteriorating the efficiency of the heat source without satisfying the design conditions.

[Hot water use mode]
It is assumed that information on the use of hot water (hot water use mode) is given to the air conditioner controller 16 from the outside. In this case, the summer / winter switching unit 16G for θ2 receives and outputs information on the use of hot water from the outside, and selectively outputs the opening θ2 of the hot water valve from the supply air temperature control unit 16B in winter. Also, the opening degree θ2 of the hot water valve from the supply air temperature control unit 16B in winter is sent from the summer / winter switching unit 16G of θ2 to the high-temperature cold water excess flow rate suppression control unit 16D.

  In this case, the summer / winter switching unit 16H for θ1 receives the information on the use of hot water from the outside, selects the opening θ1 of the high-temperature hot / cold water valve sent from the supply air temperature control unit 16B in winter, and selects the low selector Send to section 16I. The low selector section 16I is also supplied with the opening degree θ1 of the high-temperature cold water valve from the high-temperature cold water return temperature control section 16C. In this case, since the gate unit 16K closes the gate in response to information on the use of hot water from the outside, the opening degree θ1 of the high temperature cold water valve from the high temperature cold water use suppression control unit 16E is not sent to the low selector unit 16I. .

  The low selector unit 16I controls the opening degree θ1 of the high temperature cold water valve sent from the summer / winter switching unit 16H of θ1 (the opening degree θ1 of the high temperature cold water valve from the supply air temperature control unit 16B in winter), and the high temperature cold water return temperature control. Among the opening degrees θ1 of the high temperature cold water valve sent from the section 16C, the opening degree θ1 of the high temperature cold water valve having the smallest opening degree is selected and sent to the low selector section 16J.

  The low selector section 16J receives the information on the use of hot water from the outside, and the gate section 16L closes the gate, so that the opening degree θ1 of the high-temperature cold water valve is sent only from the low selector section 16I. For this reason, the low selector unit 16J has an opening degree θ1 of the high temperature cold water valve from the low selector unit 16I (an opening degree θ1 of the high temperature cold water valve from the supply air temperature control unit 16B in winter or the high temperature cold water return temperature control unit 16C. The opening degree θ1) of the high-temperature chilled water valve is selectively output as the opening degree θ1 of the high-temperature chilled water valve having the smallest opening degree.

  The air conditioning controller 16 selects the high-temperature chilled water valve opening θ1 selected by the low selector unit 16J (the high-temperature chilled water valve opening θ1 from the winter supply air temperature control unit 16B or the high-temperature chilled water return temperature control unit 16C The opening degree θ1) of the cold water valve is a control output to the high temperature cold water valve HCV. Further, the opening degree θ2 of the hot water valve (the opening degree θ2 of the hot water valve from the supply air temperature control part 16B in winter) output from the summer / winter switching part 16G of θ2 is output to the cold / hot water valve (hot water valve) CHV. And

  In the embodiment described above, the high-temperature cold water valve HCV is a two-way valve, and the relationship between the valve opening (0 to 100%) and the flow rate through the valve is expressed by the equal percent characteristic (FIG. 4). However, a two-way valve and a flow meter may be combined instead of the two-way valve. In this case, the opening degree θ1 of the high temperature cold water valve and the opening degree θ2 of the low temperature cold water valve / warm water valve can be replaced with the coil flow rate. The opening degree θ1 of the high-temperature chilled water valve replaced by the coil flow rate and the opening degree θ2 of the low-temperature chilled water valve / warm water valve, that is, not only the actual opening degree but also the flow rate indicating the opening degree, It is included in the definition of the opening degree θ1 and the opening degree θ2 of the low temperature cold water valve / hot water valve.

(Variable control of high-temperature cold water supply temperature)
In the present embodiment, the air conditioner controller 16 further has a function of determining the control state of the supply air temperature in the hot water use mode in the air conditioner 15. FIG. 10 shows an extracted functional block (supply air temperature control state determination unit 16M) for determining the control state of the supply air temperature in the hot water use mode in the air conditioner controller 16.

The supply air temperature control state determination unit 16M receives information on the use of hot water from the outside (warm water use mode), and opens the current high-temperature cold water valve opening θ1, the current hot-water valve opening θ2, and the supply air temperature. The control state of the supply air temperature in the air conditioner 15 in the hot water use mode is determined from tspv, the supply air temperature setting value tssp for the supply air temperature tspv, the high-temperature chilled water supply temperature t _HCWS pv, and the determination opening θ1j. . In this case, the supply air temperature control state determination unit 16M determines the control state of the supply air temperature in the hot water use mode with the logic shown in FIG.

That is, as shown in FIG. 11, the supply air temperature control state determination unit 16 </ b> M uses hot water in the intermediate period and winter season, as shown in FIG. In the mode, when the opening degree θ1 of the high temperature chilled water valve is the maximum opening degree, the supply air temperature tspv is higher than the supply air temperature setting value tssp, or the high temperature chilled water supply temperature t _HCWS pv is high. When cooling cannot be performed (“1”), it is determined that “a cooling capacity increase request”. When the supply air temperature tspv satisfies the supply air temperature set value tssp and the opening degree θ1 of the high-temperature cold water valve is between the maximum opening degree and the determination opening degree θ1j (“2”), “appropriate cooling (multiple flow rate)” Judge. When the supply air temperature tspv satisfies the supply air temperature set value tssp and the opening degree θ1 of the high-temperature chilled water valve is between the determination opening degree θ1j and the minimum opening degree (“3”), “appropriate cooling (low flow rate)” Judge. When the supply air temperature tspv satisfies the supply air temperature set value tssp, and the opening degree θ1 of the high-temperature cold water valve and the opening degree θ2 of the hot water valve are both the minimum opening degree (“4”), “cooling / heating stopped” Judge. When the supply air temperature tspv is lower than the supply air temperature setting value tssp (“5”), it is determined that “appropriate heating (or a heating capacity increase request)”.

  The determination result of the control state of the supply air temperature in the hot water use mode in the air conditioner 15 determined by the air conditioner controller 16 is sent to the high temperature cold water set temperature changing device 40 (FIG. 1). The high-temperature cold water set temperature changing device 40 collects the determination results of the supply air temperature control state for each air conditioner 15 and obtains the total air conditioner supply air temperature control state (total control state) with the logic shown in FIG. Determine the correction value for the high temperature cold water supply temperature. The correction value of the high temperature cold water supply temperature determined by the high temperature cold water set temperature changing device 40 is sent to the high temperature cold water heat source controller 22, and the correction value is added to or subtracted from the current high temperature cold water supply temperature setting.

  The high temperature cold water set temperature changing device 40 follows the logic shown in FIG. 13, for example, when there is a “cooling capacity increase request” and there is no “appropriate heating”, the correction value for the high temperature cold water feed temperature is set to “−1.0 ° C. " In addition, when the high / low setting of the high-temperature chilled water flow rate is low and all the air conditioners have the “appropriate flow rate (multi-flow rate)”, the correction value of the high-temperature chilled water supply temperature is set to “−0.5 ° C.”. Thereby, at the time of hot water use modes, such as an intermediate period and winter, when a high-temperature cold water passage flow rate is excessive, the high-temperature cold water feed temperature is lowered by a necessary amount. When there is “appropriate heating” and there is no “cooling capacity increase request”, the correction value of the high-temperature cold water supply temperature is set to “+1.0”. As a result, when the lack of capacity is resolved or the excessive high-temperature cold water passage flow rate is resolved, the high-temperature cold water feed temperature is returned to the original high-temperature cold water feed temperature setting. In this way, the efficiency of the high-temperature cold water heat source device can be improved while maintaining the indoor environment.

  Note that step-up correction control based on the temperature of the high-temperature cold water is prohibited for a certain period of time from the start of the heat source / air-conditioning operation. In addition, when the water supply temperature of the high-temperature chilled water heat source is changed by the high-temperature chilled water supply temperature variable control, the threshold values for the increase and decrease correction of the high-temperature chilled water heat source by the forward temperature and the return temperature are changed. For example, when the design value of high-temperature cold water is a water supply temperature (outward temperature) of 13 ° C. and a return temperature of 23 ° C. and the temperature difference in the high-temperature cold water coil of the air conditioner is 10 ° C., It is assumed that the threshold for determining the step reduction by the return temperature is 19 ° C. If the water supply temperature (outgoing temperature) is changed to 10 ° C, the high temperature chilled water heat source unit will decrease the stage when the return temperature is 19 ° C or lower unless the threshold values for the step increase and decrease correction are changed. The temperature difference is 9 ° C. and the load factor of 90% of the rating, and no step reduction due to the return temperature is necessary. Moreover, although the high temperature cold water heat source machine does not increase in stage unless the forward temperature becomes 17 ° C. or higher, it is originally necessary to increase the temperature at 14 ° C. or higher. In this way, by changing the high-temperature cold water heat source unit increase / decrease correction threshold based on the forward temperature and return temperature by variable control of the high-temperature cold water feed temperature, the step-down of wasteful high-temperature cold water heat source unit can be suppressed and It is possible to increase the number of high-temperature cold water heat source equipment for maintenance.

(High-temperature cold water heat source step-up suppression control)
In the present embodiment, the low-temperature cold water heat source controller 21 has a function of increasing or decreasing the number of low-temperature cold water heat source units. The high-temperature cold water heat source controller 22 has a function of increasing / decreasing the number of high-temperature cold water heat source units and a function of suppressing an increase in the number of high-temperature cold water heat source units.

  Before describing the function of suppressing the increase in the number of high-temperature chilled water heat source units in the high-temperature chilled water heat source controller 22, the low-temperature chilled water heat source controller 21 and the high-temperature chilled water heat source controller 22 and the high-temperature chilled water heat source controller 22 before the addition of this function. The increase / decrease function of the machine will be described with reference to FIG.

  In addition, in FIG. 14, the low temperature cold water heat source machine is shown with the code | symbol 1A, and the high temperature cold water heat source machine is shown with the code | symbol 1B. In this example, in order to simplify the explanation, it is assumed that the low-temperature cold water heat source unit 1A and the high-temperature cold water heat source unit 1B are dedicated heat source units, not combined low-temperature cold water / high-temperature cold water. That is, in the configuration shown in FIG. 1, it is assumed that a plurality of dedicated low-temperature cold water heat source units 1A and high-temperature cold water heat source units 1B are provided.

  The low-temperature chilled water heat source controller 21 includes a low-temperature chilled water load calorific value calculation unit 21A that calculates the current low-temperature chilled water load heat amount (total load heat amount), and a low-temperature chilled water heat source operation number control unit 21B that controls the number of operating low-temperature chilled water heat source units 1A. And have. The high-temperature chilled water heat source controller 22 includes a high-temperature chilled water heat calorific value calculation unit 22A that calculates the current high-temperature chilled water load calorie (total load calorie), and a high-temperature chilled water heat source operation number control unit 22B that controls the number of operating high-temperature chilled water heat source units 1B. And have.

  In the low-temperature chilled water heat source controller 21, the low-temperature chilled water load calorific value calculating unit 21 </ b> A sets the total flow rate of the low-temperature chilled water passing through all the air conditioners 15 as the low-temperature chilled water total load flow rate. Multiply the return temperature difference of the low-temperature cold water to find the current low-temperature cold water load heat (total load heat).

The total flow rate of the low-temperature cold water passing through all the air conditioners 15 is detected by the flow meter 27 (FIG. 1) as the cold / hot water total flow rate Q _CHW (low-temperature cold water total load flow rate Q _CCW ). Further, the difference in the return temperature of the low-temperature cold water to all of the air conditioners 15 is the low temperature detected by the return temperature sensor 26 (FIG. 1) and the return temperature sensor _CC (FIG. 1) detected by the return temperature sensor 25 (FIG. 1). It is calculated as the difference from the cold water return temperature t _CCWR .

  The low-temperature chilled water heat source operation number control unit 21B determines the number of low-temperature chilled water heat source units 1A to be operated on the basis of the current low-temperature chilled water load heat quantity obtained by the low-temperature chilled water load calorie calculation unit 21A. Sends a step increase / decrease command to the cold water heat source machine group).

  In the high-temperature chilled water heat source controller 22, the high-temperature chilled water load calorific value calculation unit 22A sets the total flow rate of the high-temperature chilled water passing through all the air conditioners 15 as the high-temperature chilled water total load flow rate. Multiply the return temperature difference of high-temperature cold water to find the current high-temperature cold water load heat (total load heat).

In addition, the total flow rate of the high temperature cold water passing through all the air conditioners 15 is detected as the high temperature cold water total load flow rate Q _HCW by the flow meter 30 (FIG. 1). Also, shuttle temperature difference of the hot cold water,往水temperature sensor 28 (FIG. 1) is Kaemizu temperature of the hot-cold water temperature sensor 29 instead of the往水temperature t _HCWs hot cold water detecting (FIG. 1) detects t _HCWR It is calculated as the difference.

  The high-temperature chilled water heat source operation number control unit 22B determines the number of high-temperature chilled water heat source units 1B to be operated based on the current load heat quantity of the high-temperature chilled water load calculated by the high-temperature chilled water load calorie calculation unit 22A. Sends a step increase / decrease command to the cold water heat source machine group).

  In the low-temperature cold water heat source controller 21 and the high-temperature cold water heat source controller 22, the control of the number of operating heat sources for the low-temperature cold water and the high-temperature cold water is determined based on the amount of load heat, and the cooperative control considering the heat source efficiency is not performed. For this reason, although the load factor of the low-temperature chilled water heat source unit 1A has a margin, the efficiency of the high-temperature chilled water heat source unit 1B may decrease due to the stage increase of the high-temperature chilled water heat source unit 1B.

  Therefore, in the present embodiment, as shown in FIG. 15, in order to suppress the increase in the number of high-temperature chilled water heat source units 1B, a step-up suppression unit 22C is added to the high-temperature chilled water heat source operation number control unit 22B of the high-temperature chilled water heat source controller 22. It is added. The operation of the stage increasing suppression unit 22C will be described by taking as an example a case where one low-temperature cold water heat source unit 1A and one high-temperature cold water heat source unit 1B are operated with equal capacities.

  In the following description, the load factor of the low-temperature chilled water heat source unit 1A and the high-temperature chilled water heat source unit 1B is the amount of production heat with respect to the rated capacity. The overall system is a two-pump system as shown in FIG. The following conditions a and b are assumed as preconditions.

The low-temperature cold water heat source machine 1A and the high-temperature cold water heat source machine 1B are a plurality of heat source systems, and the compression cycle is a fixed speed machine (condition a).
-However, even if the heat source machine is an inverter-mounted machine, if the efficiency at the partial load is the same or lower than the efficiency at the rated capacity, this control is targeted (condition b).

  FIG. 16 (a) shows the relationship between the load factor of the high-temperature chilled water heat source unit 1B and COP (coefficient of performance), and FIG. 16 (b) shows the relationship between the load factor of the high-temperature chilled water heat source unit 1B and the stage increase request (pre). FIG. 16 (c) shows the relationship between the load factor of the high-temperature cold water heat source unit 1B and ON / OFF of the high-temperature cold water valve upper limit holding mode. FIG. 17A shows the relationship between the load factor of the low-temperature chilled water heat source unit 1A and COP (coefficient of performance), and FIG. 17B shows the load factor of the low-temperature chilled water heat source unit 1A and the ON / OFF of the high-temperature chilled water valve upper limit holding mode. The relationship with OFF is shown. FIG. 18 shows a flowchart of the operation of the step increase suppression unit 22C. The high temperature cold water valve upper limit holding mode will be described later. Further, the stage increase request (pre) indicates a state before an actual stage increase request is issued, and the stage increase request (pre) is not yet performed.

  In the high temperature cold water heat source controller 22, the stage increase suppressing unit 22C has a load factor of the high temperature cold water heat source unit 1B that is less than the stage increase request (pre) determination load factor (95% in this example) (shown in FIG. 16A). (Refer to (1)), when the load factor of the low-temperature chilled water heat source unit 1A is less than or equal to the high-temperature chilled water valve upper limit retention determination load factor (60% in this example) (see (1) shown in FIG. 17 (a)) When the load factor of the chilled water heat source unit 1B increases and exceeds the step increase request (pre) determination load factor (see (2) shown in FIG. 16A, YES in step S101 in FIG. 18), the step increase request ( Pre) is turned ON (see FIG. 16B, step S102 in FIG. 18), and the load factor of the low-temperature chilled water heat source unit 1A is less than the high-temperature chilled water valve upper limit retention determination load factor (FIG. 17A). (Refer to (1), YES in step S103 in FIG. 18), valve upper limit The holding mode is set to ON (see (2) shown in FIG. 16C, step S104 in FIG. 18), and a high-temperature chilled water valve upper limit change holding command is output to each air conditioner controller 16 ((3) shown in FIG. 15). See step S105 in FIG.

  Thereby, each air conditioner controller 16 changes the current opening degree of the high temperature cold water valve HCV of each air conditioner 15 to the upper limit value, and holds the changed upper limit value. By holding the change of the upper limit value by each air conditioner controller 16, the high temperature chilled water valve HCV of each air conditioner 15 is controlled within the range below the upper limit value after the change, and the increase in the stage of the high temperature chilled water heat source unit 1B is suppressed. Will be.

  Each air conditioner 15 performs supply air temperature control. When the supply air temperature becomes higher than the supply air temperature setting as the cooling load increases, the open / closed cold / hot water valve (low temperature cold water valve) CHV is opened. The supply air temperature control is performed by opening the temperature from the current level (see (4) shown in FIG. 15). Thereby, the load factor of 1 A of low-temperature cold-water heat source machines increases (refer (5) shown to Fig.17 (a)).

  When the load factor of the low-temperature chilled water heat source unit 1A increases and becomes equal to or higher than the high-temperature chilled water valve upper limit retention determination load factor + α2 (see (6-2) shown in FIG. 17A, FIG. 18 step S108), the step increase suppression unit 22C Sets the high temperature chilled water valve upper limit value holding mode to OFF (see (6-2) in FIG. 17B, step S110 in FIG. 18), and outputs a high temperature chilled water valve upper limit value change release command to each air conditioner controller 16. (Refer to (7) shown in FIG. 15, step S111 in FIG. 18).

  Thereby, each air conditioner controller 16 returns the upper limit value of the opening degree of the high-temperature cold water valve HCV of each air conditioner 15 to the value before the change (for example, 100%). By canceling the change of the upper limit value by each air conditioner controller 16, the high temperature chilled water valve HCV of each air conditioner 15 is controlled within the range below the upper limit value before the change, thereby suppressing the increase in the stage of the high temperature chilled water heat source unit 1B. Will be released.

  When the cooling load is reduced, the load factor of the high-temperature chilled water heat source unit 1B is reduced to be equal to or less than the stage increase request (pre) determination load factor -α1 ((6-1) shown in FIG. 16A). Reference, YES in step S107 in FIG. 18), the step increase suppression unit 22C turns off the step increase request (pre) (see (6-1) in FIG. 16B, step S109 in FIG. 18). The high temperature chilled water valve upper limit value holding mode is set to OFF (see (6-1) shown in FIG. 16C, step S110 in FIG. 18), and a high temperature chilled water valve upper limit value change release command is output to each air conditioner controller 16 (FIG. 15 (see (7) in FIG. 18, step S111).

  Further, even when the increase in the temperature of the high-temperature chilled water heat source unit 1B is being suppressed, the increase-inhibition suppressing unit 22C is configured to continue when the high-temperature chilled water supply temperature is higher than the high-temperature chilled water supply temperature set value + α3 for a certain period of time (see FIG. 18 YES in step S106), a high temperature chilled water valve upper limit change release command is output to each air conditioner controller 16 (step S111 in FIG. 18), the step-up suppression of the high temperature chilled water heat source unit 1B is canceled, and the high temperature chilled water heat source unit 1B. Can be increased.

  Further, in the example shown in FIG. 15, the increase / decrease stage of the low temperature chilled water heat source unit 1A in the low temperature chilled water heat source controller 21 and the increase / decrease stage of the high temperature chilled water heat source unit 1B in the high temperature chilled water heat source controller 22 are a two-pump system. In the case of a one-pump system, the increase / decrease stage is determined not by the load heat amount (total load heat amount) but by the load flow rate (total load flow rate).

  As described above, when there is a margin in the load factor of the low-temperature chilled water heat source units that are currently in operation due to the high-temperature chilled water source increase control, the increase of the high-temperature chilled water source units is suppressed and the efficiency of the high-temperature chilled water source units remains high. While maintaining, the load factor of the low-temperature chilled water heat source device can be increased, and the efficiency of the low-temperature chilled water heat source device can be increased.

(Simultaneous increase / decrease control of high-temperature cold water heat source and low-temperature cold water heat source)
FIG. 15 also shows a heat source integrated controller 24 together with the low-temperature cold water heat source controller 21 and the high-temperature cold water heat source controller 22. In the present embodiment, the heat source integrated controller 24 includes a simultaneous increase / decrease stage suppression unit 24A that suppresses simultaneous increase / decrease stages of the low temperature cold water heat source unit 1A and the high temperature cold water heat source unit 1B.

[Suppression of simultaneous stage increase]
FIG. 19 shows a flowchart of the simultaneous increase / decrease suppression operation performed by the simultaneous increase / decrease suppression unit 24A. The simultaneous increase / decrease stage suppression unit 24A simultaneously generates a stage increase request to the low temperature chilled water heat source unit 1A in the low temperature chilled water heat source controller 21 and a stage increase request to the high temperature chilled water heat source unit 1B in the high temperature heat source controller 22 (step S201 in FIG. 19). YES), the efficient high temperature cold water heat source unit 1B is prioritized (step S202 in FIG. 19), and the high temperature cold water heat source unit 1B is requested to be increased first by the high temperature heat source controller 22 (step S203 in FIG. 19).

  After the stage increase of the high-temperature chilled water heat source unit 1B, after the effect waiting time has elapsed (YES in step S204 in FIG. 19), the low-temperature chilled water heat source controller 21 executes a request for increasing the low-temperature chilled water heat source unit 1A (step S205 in FIG. 19). ). Then, after the effect waiting time has elapsed (YES in step S206 in FIG. 19), the process returns to step S201 in FIG.

  The simultaneous increase / decrease stage suppression unit 24A generates a stage increase request to the low temperature cold water heat source unit 1A in the low temperature cold water heat source controller 21 and a stage increase request to the high temperature cold water heat source unit 1B in the high temperature heat source controller 22 (FIG. 19). In step S201, it is determined whether the stage increase request is a stage increase request for the low temperature chilled water heat source unit 1A or a stage increase request for the high temperature chilled water heat source unit 1B.

  When it is a stage increase request to the low temperature chilled water heat source unit 1A (YES in step S207 in FIG. 19), the simultaneous increase / decrease stage suppression unit 24A causes the low temperature chilled water heat source controller 21 to execute a stage increase request for the low temperature chilled water heat source unit 1A ( (Step S208 in FIG. 19) After the effect waiting time has elapsed (YES in Step S209 in FIG. 19), the process returns to Step S201 in FIG.

  When it is a stage increase request to the high temperature chilled water heat source unit 1B (YES in step S210 in FIG. 19), the simultaneous increase / decrease stage suppression unit 24A causes the high temperature chilled water heat source controller 22 to execute a stage increase request for the high temperature chilled water heat source unit 1B ( (Step S211 in FIG. 19) After the effect waiting time has elapsed (YES in Step S212 in FIG. 19), the process returns to Step S201 in FIG.

(Suppression of simultaneous step-down)
FIG. 20 shows a flowchart of the simultaneous step reduction suppressing operation performed by the simultaneous increase / decrease step suppressing unit 24A. The simultaneous increase / decrease stage suppression unit 24A simultaneously generates a step reduction request to the low temperature chilled water heat source unit 1A in the low temperature chilled water heat source controller 21 and a step reduction request to the high temperature chilled water heat source unit 1B in the high temperature chilled water heat source controller 22 (step in FIG. 20). The low-temperature cold water heat source unit 1A having low efficiency is prioritized (step S302 in FIG. 20), and the low-temperature cold water heat source controller 21 first executes a step-down request for the low-temperature cold water heat source unit 1A (step S303 in FIG. 20).

  Then, after the stage reduction of the low-temperature chilled water heat source unit 1A, after the effect waiting time has elapsed (YES in step S304 in FIG. 20), a step-down request for the high-temperature chilled water heat source unit 1B is executed by the high-temperature chilled water heat source controller 22 (step S305 in FIG. 20). ). Then, after the elapse of the effect waiting time (YES in step S306 in FIG. 20), the process returns to step S301 in FIG.

  The simultaneous increase / decrease stage suppression unit 24A generates a step reduction request to the low temperature chilled water heat source unit 1A in the low temperature chilled water heat source controller 21 and a step reduction request to the high temperature chilled water heat source unit 1B in the high temperature chilled water heat source controller 22 (FIG. 20 NO in step S301), it is determined whether the step reduction request is a step reduction request for the low temperature chilled water heat source unit 1A or a step reduction request for the high temperature chilled water heat source unit 1B.

  When it is a step-down request to the low-temperature chilled water heat source unit 1A (YES in step S307 in FIG. 20), the simultaneous increase / decrease stage suppression unit 24A causes the low-temperature chilled water heat source controller 21 to execute a step-down request for the low-temperature chilled water heat source unit 1A ( Step S308 in FIG. 20) After the effect waiting time has elapsed (YES in Step S309 in FIG. 20), the process returns to Step S301 in FIG.

  When it is a step reduction request to the high temperature chilled water heat source unit 1B (YES in step S310 in FIG. 20), the simultaneous increase / decrease stage suppression unit 24A causes the high temperature chilled water heat source controller 22 to execute a step reduction request for the high temperature chilled water heat source unit 1B ( Step S311 in FIG. 20) After the effect waiting time has elapsed (YES in Step S312 in FIG. 20), the process returns to Step S301 in FIG.

  The simultaneous increase / decrease control of the high temperature cold water heat source and the low temperature cold water heat source simultaneous increase / decrease control avoids simultaneous increase or decrease of the low temperature cold water heat source unit 1A and the high temperature cold water heat source unit 1B. The influence of disturbance on the supply air temperature control of the air conditioner 15 due to fluctuations in the water supply temperature of the low-temperature cold water and the high-temperature cold water accompanying the increase or decrease of the stage is reduced.

[Extension of the embodiment]
The present invention has been described above with reference to the embodiment. However, the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention.

  1-1 to 1-4 ... low temperature / high temperature cold water heat source machine, 1A ... low temperature cold water heat source machine, 1B ... high temperature cold water heat source machine, 2-1, 2-2 ... hot water heat source machine, 3-1 to 3-6 ... 1 Secondary pump, 9-1 to 9-6 ... Secondary pump, 11, 12 ... Outbound pipeline, 13, 14 ... Return water pipeline, 15-1 to 15-3 ... Air conditioner, 15A ... Cold / hot water coil (hot water coil) / Low temperature cold water coil), 15B ... High temperature cold water coil, 15C ... Fan, HCV ... High temperature cold water valve, CHV ... Cold / hot water valve, 16-1 to 16-3 ... Air conditioner controller, 16A ... Summer supply air temperature controller ( 1st calculating part), 16B ... Winter supply air temperature control part (2nd calculating part), 16C ... High temperature cold water return temperature control part (3rd calculating part), 16D ... High temperature cold water excessive flow rate suppression control part (4th calculation) Part), 16E ... high temperature cold water use suppression control part (fifth arithmetic part) for maintaining the dehumidifying effect, G: Summer / winter switching unit for θ2, 16H: Summer / winter switching unit for θ1, 16I, 16J: Low selector unit, 16K, 16L ... Gate unit, 16M ... Supply air temperature control state determination unit, 17, 18, 19, 20 ... Valve, 21 ... Low-temperature chilled water heat source controller, 21A ... Low-temperature chilled water load heat quantity calculation unit, 21B ... Low-temperature chilled water heat source operation number control unit, 22 ... High-temperature chilled water heat source controller, 22A ... High-temperature chilled water load heat quantity calculation unit, 22B ... High-temperature chilled water heat source Number-of-operations control unit, 22C: Step increase suppression unit, 23 ... Hot water heat source controller, 24 ... Heat source integrated controller, 24A ... Simultaneous increase / decrease step suppression unit, 25 ... Cold / hot water supply water temperature sensor, 26 ... Cold / hot water return water temperature sensor, 27 ... Cold / hot water flow meter, 28 ... High temperature chilled water flow temperature sensor, 29 ... High temperature chilled water return water temperature sensor, 30 ... High temperature chilled water flow meter, 31 ... Supply temperature sensor, 32 ... Supply humidity 33, supply air volume sensor, 34 ... intake air temperature sensor, 35 ... intake air humidity sensor, 36 ... high temperature cold water coil inlet temperature sensor, 37 ... high temperature cold water coil outlet temperature sensor, 38 ... return air humidity sensor, 39 ... cold hot water Coil outlet temperature sensor, 40 ... high temperature cold water set temperature changing device.

Claims (12)

A high-temperature cold water heat source that generates high-temperature cold water, a low-temperature cold-water heat source that generates low-temperature cold water, a hot-water heat source that generates hot water, a high-temperature cold water coil that takes in high-temperature cold water generated by the high-temperature cold water heat source, and the low-temperature A cold / hot water coil used as a low temperature cold water coil when cold water is taken in, or when cold water is taken in, or as a hot water coil when hot water is taken in An air conditioner, a high temperature cold water valve provided in a high temperature cold water supply path to the high temperature cold water coil, and a low temperature cold water or hot water supply path to the cold hot water coil. Is used as a low-temperature cold water valve when hot water flows, and when hot water flows through this supply path, it is used as a hot water valve And supplying air to the controlled object from the air conditioner, mixing the return air from the controlled object and outside air, supplying the air to the air conditioner, and supplying air to the controlled object from the air conditioner By controlling the opening degree θ1 of the high-temperature chilled water valve and the opening degree θ2 of the chilled / hot water valve so that the temperature becomes the supply air temperature set value, the high-temperature chilled water to the high-temperature chilled water coil and the chilled / hot water coil In the air conditioning system that adjusts the supply amount of low temperature cold water or hot water,
Of the opening θ1 of the high-temperature chilled water valve and the opening θ2 of the low-temperature chilled water valve such that the temperature of the supply air from the air conditioner to the controlled object is the supply air temperature setting value, The opening degree θ1 is preferentially obtained, and the obtained opening degree θ1 of the high-temperature chilled water valve and the opening degree θ2 of the low-temperature chilled water valve are determined as the opening degree θ1 of the high-temperature chilled water valve and the opening degree of the low-temperature chilled water valve. first computing means for θ2,
The opening temperature θ1 of the high-temperature cold water valve and the opening angle θ2 of the hot water valve are determined such that the temperature of the supply air from the air conditioner to the controlled object is the supply air temperature setting value. Second computing means for setting the opening degree θ1 of the valve and the opening degree θ2 of the hot water valve to the opening degree θ1 of the high temperature cold water valve and the opening degree θ2 of the hot water valve of the winter supply air temperature control;
The opening temperature θ1 of the high-temperature chilled water valve is determined such that the outlet temperature of the high-temperature chilled water from the high-temperature chilled water coil is the high-temperature chilled water return temperature, and the high-temperature chilled water return temperature is the high-temperature chilled water return temperature set value. Third operating means for setting the opening degree θ1 of the valve to the opening degree θ1 of the high temperature cold water valve for high temperature cold water return temperature control;
The present processing heat quantity with respect to the rated cooling capacity of the air conditioner is calculated as the current processing capacity ratio of the air conditioner, and the opening degree θ2 of the low-temperature cold water valve obtained by the first calculation means and the calculated air conditioner The upper limit value of the opening degree θ1 of the high temperature chilled water valve is obtained from the current processing capacity ratio of the high temperature chilled water valve, and the upper limit value of the obtained opening degree θ1 of the high temperature chilled water valve is determined as the opening degree θ1 of the high temperature chilled water valve of the high temperature chilled water excessive flow suppression control. And a fourth computing means,
When in the mode of using the cold / hot water coil as a low-temperature cold water coil, the opening degree θ1 of the high-temperature cold water valve for summer supply air temperature control obtained by the first computing means is obtained by the third computing means. The opening degree θ1 of the high temperature chilled water valve for the high temperature chilled water return temperature control and the opening degree θ1 of the high temperature chilled water valve for the high temperature chilled water excess flow rate control obtained by the fourth calculation means are the highest at the opening degree. An air conditioning system comprising: a minimum opening selection means for selecting the opening θ1 of the cold water valve as a control output. In the air conditioning system according to claim 1,
The upper limit value of the opening degree θ1 of the high temperature cold water valve is obtained from the return air from the air conditioner to the controlled object or the indoor humidity and the return air or indoor humidity set value, and the obtained opening degree θ1 of the high temperature cold water valve is obtained. And a fifth arithmetic means for setting the opening degree θ1 of the high-temperature cold water valve of the high-temperature cold water use suppression control for maintaining the dehumidification effect,
Instead of the minimum opening selection means,
When in the mode of using the cold / hot water coil as a low-temperature cold water coil, the opening degree θ1 of the high-temperature cold water valve for summer supply air temperature control obtained by the first computing means is obtained by the third computing means. The opening degree θ1 of the high-temperature chilled water valve for the high-temperature chilled water return temperature control, the opening degree θ1 of the high-temperature chilled water valve for the high-temperature chilled water excess flow suppression control obtained by the fourth computing means, and the fifth computing means Of the opening degree θ1 of the high-temperature chilled water valve of the high-temperature chilled water use suppression control for maintaining the dehumidifying effect, the opening degree θ1 of the high-temperature chilled water valve having the smallest opening degree is provided as a control output. An air conditioning system characterized by In the air conditioning system according to claim 1 or 2,
The minimum opening selection means includes
When in the mode of using the cold / hot water coil as a hot water coil, the opening degree θ1 of the high temperature cold water valve for the winter supply air temperature control obtained by the second computing means, obtained by the third computing means An air-conditioning system, wherein an opening degree θ1 of a high-temperature chilled water valve having the smallest opening degree is selected as a control output among opening degrees θ1 of a high-temperature chilled water return temperature control. In the air-conditioning system described in any one of Claims 1-3,
When in the mode of using the cold / hot water coil as a hot water coil, the current supply air temperature control state of the air conditioner is determined from at least the current opening θ1 of the high-temperature cold water valve and the current opening θ2 of the hot water valve. Supply air temperature control state determination means to
High temperature cold water set temperature changing means for changing the set temperature of the high temperature cold water supplied to the air conditioner according to the current air supply temperature control state of the air conditioner determined by the air supply temperature control state determining means. An air conditioning system characterized by that. In the air-conditioning system described in any one of Claims 1-4,
A plurality of the high-temperature cold water heat source machines;
A plurality of the low-temperature cold water heat source machines;
High-temperature cold water heat source machine operation number control means for increasing / decreasing the number of operating high-temperature cold water heat source units according to the current high-temperature cold water total load flow or total load heat amount,
A low-temperature chilled water heat source machine operation number control means for increasing or decreasing the number of operating low-temperature chilled water heat source units according to the current total low-temperature chilled water load or total load heat,
The high temperature cold water heat source machine operation number control means,
If the load factor of the high-temperature chilled water heat source unit group currently in operation exceeds the load increase request determination load factor, check whether there is a margin in the load factor of the low-temperature chilled water heat source unit group currently in operation. The high temperature chilled water heat source machine step-up suppression means for changing the upper limit value of the opening of the high temperature chilled water valve to the current opening and holding the changed upper limit value until a release command is issued is provided. Air conditioning system. In the air-conditioning system described in any one of Claims 1-4,
A plurality of the high-temperature cold water heat source machines;
A plurality of the low-temperature cold water heat source machines;
High-temperature cold water heat source machine operation number control means for increasing / decreasing the number of operating high-temperature cold water heat source units according to the current high-temperature cold water total load flow or total load heat amount,
Low-temperature chilled water heat source unit operation number control means for increasing or decreasing the number of operating low-temperature chilled water heat source units according to the current total low-temperature chilled water load or total load heat,
When there is an increase request simultaneously from the high-temperature chilled water heat source unit operation number control means and the low-temperature chilled water heat source unit operation number control unit, the high-temperature chilled water heat source unit operation is preferentially executed, and the high-temperature chilled water heat source unit operation is performed. A simultaneous increase / decrease stage suppression means for preferentially executing the step reduction of the low-temperature chilled water heat source unit when there is a request for stage reduction simultaneously from the number control means and the low-temperature chilled water heat source unit operation number control means. Air conditioning system. A high-temperature cold water heat source that generates high-temperature cold water, a low-temperature cold-water heat source that generates low-temperature cold water, a hot-water heat source that generates hot water, a high-temperature cold water coil that takes in high-temperature cold water generated by the high-temperature cold water heat source, and the low-temperature A cold / hot water coil used as a low temperature cold water coil when cold water is taken in, or when cold water is taken in, or as a hot water coil when hot water is taken in An air conditioner, a high temperature cold water valve provided in a high temperature cold water supply path to the high temperature cold water coil, and a low temperature cold water or hot water supply path to the cold hot water coil. Is used as a low-temperature cold water valve when hot water flows, and when hot water flows through this supply path, it is used as a hot water valve And supplying air to the controlled object from the air conditioner, mixing the return air from the controlled object and outside air, supplying the air to the air conditioner, and supplying air to the controlled object from the air conditioner By controlling the opening degree θ1 of the high-temperature chilled water valve and the opening degree θ2 of the chilled / hot water valve so that the temperature becomes the supply air temperature set value, the high-temperature chilled water to the high-temperature chilled water coil and the chilled / hot water coil In the air conditioning method of adjusting the supply amount of low temperature cold water or hot water,
Of the opening θ1 of the high-temperature chilled water valve and the opening θ2 of the low-temperature chilled water valve such that the temperature of the supply air from the air conditioner to the controlled object is the supply air temperature setting value, The opening degree θ1 is preferentially obtained, and the obtained opening degree θ1 of the high-temperature chilled water valve and the opening degree θ2 of the low-temperature chilled water valve are determined as the opening degree θ1 of the high-temperature chilled water valve and the opening degree of the low-temperature chilled water valve. a first calculation step for θ2,
The opening temperature θ1 of the high-temperature cold water valve and the opening angle θ2 of the hot water valve are determined such that the temperature of the supply air from the air conditioner to the controlled object is the supply air temperature setting value. A second calculation step in which the opening θ1 of the valve and the opening θ2 of the hot water valve are set as the opening θ1 of the high temperature cold water valve and the opening θ2 of the hot water valve of the supply air temperature control in winter;
The opening temperature θ1 of the high-temperature chilled water valve is determined such that the outlet temperature of the high-temperature chilled water from the high-temperature chilled water coil is the high-temperature chilled water return temperature, and the high-temperature chilled water return temperature is the high-temperature chilled water return temperature set value. A third calculation step in which the opening degree θ1 of the valve is set as the opening degree θ1 of the high temperature chilled water valve of the high temperature cold water return temperature control;
The present processing heat quantity with respect to the rated cooling capacity of the air conditioner is calculated as a ratio of the current processing capacity of the air conditioner, and the opening degree θ2 of the low-temperature cold water valve obtained by the first calculation step and the calculated air conditioner The upper limit value of the opening degree θ1 of the high temperature chilled water valve is obtained from the current processing capacity ratio of the high temperature chilled water valve, and the upper limit value of the obtained opening degree θ1 of the high temperature chilled water valve is determined as the opening degree θ1 of the high temperature chilled water valve of the high temperature chilled water excessive flow suppression control. And a fourth calculation step,
When in the mode of using the cold / hot water coil as a low-temperature cold water coil, the opening degree θ1 of the high-temperature cold water valve for summer supply air temperature control obtained in the first computation step is obtained in the third computation step. The opening degree θ1 of the high-temperature chilled water return temperature control and the opening degree θ1 of the high-temperature chilled water excessive flow suppression control high-temperature chilled water valve control obtained in the fourth calculation step are the highest temperature. An air conditioning method comprising: a minimum opening selection step of selecting the opening θ1 of the cold water valve as a control output. In the air conditioning method according to claim 7,
The upper limit value of the opening degree θ1 of the high temperature cold water valve is obtained from the return air from the air conditioner to the controlled object or the indoor humidity and the return air or indoor humidity set value, and the obtained opening degree θ1 of the high temperature cold water valve is obtained. A fifth calculation step of setting the upper limit value of the high-temperature cold water valve opening degree θ1 of the high-temperature cold water use suppression control for maintaining the dehumidification effect,
Instead of the minimum opening selection step,
When in the mode of using the cold / hot water coil as a low-temperature cold water coil, the opening degree θ1 of the high-temperature cold water valve for summer supply air temperature control obtained in the first computation step is obtained in the third computation step. The opening degree θ1 of the high temperature chilled water valve for the high temperature chilled water return temperature control, the opening degree θ1 of the high temperature chilled water valve for the high temperature chilled water excess flow suppression control obtained in the fourth calculation step, and the value obtained in the fifth calculation step. A minimum opening selection step of selecting, as a control output, the opening θ1 of the high-temperature chilled water valve having the smallest opening degree among the opening degrees θ1 of the high-temperature chilled water use suppression control for maintaining the dehumidifying effect. An air conditioning method characterized by In the air-conditioning method according to claim 7 or 8,
The minimum opening selection step includes:
When in the mode of using the cold / hot water coil as a hot water coil, the opening degree θ1 of the high-temperature cold water valve of the winter supply air temperature control obtained in the second computation step, obtained in the third computation step. An air-conditioning method characterized by selecting, as a control output, an opening degree θ1 of a high-temperature chilled water valve having the smallest opening degree among the opening degrees θ1 of the high-temperature chilled water return temperature control. In the air-conditioning method described in any one of Claims 7-9,
When in the mode of using the cold / hot water coil as a hot water coil, the current supply air temperature control state of the air conditioner is determined from at least the current opening θ1 of the high-temperature cold water valve and the current opening θ2 of the hot water valve. An air supply temperature control state determination step to perform;
A high temperature cold water set temperature changing step for changing the set temperature of the high temperature cold water supplied to the air conditioner according to the current air supply temperature control state of the air conditioner determined by the air supply temperature control state determining step. An air conditioning method characterized by that. In the air-conditioning method described in any one of Claims 7-10,
A high-temperature cold water heat source unit operation number control step for increasing or decreasing the number of operating high-temperature cold water heat source units according to the current total high-temperature cold water load flow or total load heat amount, and
A low-temperature chilled water heat source operation number control step of increasing or decreasing the number of operating low-temperature chilled water heat source units according to the current total low-temperature chilled water load or total load heat,
The high temperature cold water heat source machine operation number control step is,
If the load factor of the high-temperature chilled water heat source unit group currently in operation exceeds the load increase request determination load factor, check whether there is a margin in the load factor of the low-temperature chilled water heat source unit group currently in operation. When changing the upper limit value of the opening of the high-temperature chilled water valve to the current opening, and holding the changed upper-limit value until a release command is issued, the high-temperature chilled water heat source equipment step-up suppression step is provided. Air conditioning method. In the air-conditioning method described in any one of Claims 7-10,
A high-temperature cold water heat source unit operation number control step for increasing or decreasing the number of operating high-temperature cold water heat source units according to the current total high-temperature cold water load flow or total load heat amount, and
Low-temperature chilled water heat source unit operation number control step for increasing or decreasing the number of operating low-temperature chilled water heat source units according to the current low-temperature chilled water total load flow or total load heat amount, and
When there is an increase request simultaneously from the high-temperature chilled water heat source operation number control step and the low-temperature chilled water heat source operation number control step, the high-temperature chilled water heat source unit is preferentially executed, and the high-temperature chilled water heat source operation is performed. A simultaneous increase / decrease stage suppression step that preferentially executes the step reduction of the low-temperature chilled water heat source unit when there is a step reduction request simultaneously from the number control step and the low-temperature chilled water heat source unit operation number control step. Air conditioning method.