JP5492712B2 - Water supply temperature control apparatus and method - Google Patents

Description

  The present invention relates to a water supply temperature control apparatus and method for controlling the water supply temperature of a heat medium to a load device in a heat source system using cold / hot water as a heat medium.

  Conventionally, in a heat source system using cold / hot water as a heat medium, the water supply temperature of the heat medium to the load device is controlled to be constant (generally 5 to 7 ° C.). For example, when the load device is an air conditioner, the water supply temperature is not changed even if the load on the air conditioner increases or decreases. When the load of the air conditioner increases or decreases, the opening degree of the control valve attached to the air conditioner is increased or decreased, and the amount of cold / hot water to the air conditioner is increased or decreased.

  However, in such a constant water supply temperature control, when the load of the air conditioner is low, the water supply temperature is excessive with respect to the water supply temperature necessary to cover the amount of heat actually consumed by the air conditioner. COP (coefficient of performance: ratio of power consumption for generating cold / warm water and amount of heat generated) of (cooling heat source machine, hot heat source machine) is lowered, and energy is wasted. For example, if the load of the air conditioner is low during cooling, the water supply temperature is low and the return water temperature is low, the COP of the cold heat source machine (refrigerator) is lowered, and energy is wasted. .

  Therefore, in recent years, for the purpose of energy saving (hereinafter abbreviated as energy saving), water supply temperature set value change control (VWT control) has been implemented. For example, if the load of the air conditioner is low during cooling, the water supply temperature is raised. That is, the water supply temperature is relaxed in the energy saving direction (hereinafter, the temperature relaxation in the energy saving direction is simply referred to as relaxation). Thereby, COP of a refrigerator improves and energy saving is achieved (for example, refer patent document 1).

  FIG. 13 shows an example of a conventional heat source system that performs VWT control. In the figure, 1-1 and 1-2 are refrigerators, 2-1 and 2-2 are primary pumps provided as individual devices in the circulation path of cold water to the refrigerators 1-1 and 1-2. 3 is a forward header that mixes cold water from the refrigerators 1-1 and 1-2, 4 is a forward water line, and 5 is supplied with cold water sent from the forward header 3 via the forward water line 4 A load device (heat load such as an air conditioner or a fan coil), 6 is a return water pipe, and 7 is a cold water valve that adjusts the amount of cold water supplied to the load device 5 according to the load state.

  8 is a return header in which the cold water sent through the return water pipe 6 is exchanged by heat exchange in the load device 5, 9 is a bypass pipe that connects the forward header 3 and the return header 8, and 10 is from the forward header 3. A water supply temperature sensor that measures the temperature of the cold water to the load device 5 as the water supply temperature TS, 11 is a return water temperature sensor that measures the temperature of the cold water returned to the return header 8 as the return water temperature TR, and 12 is returned to the return header 8. A flow meter that measures the flow rate of the chilled water as the load flow rate F, 13-1 and 13-2 are refrigerator outlet temperature sensors that measure the outlet temperature of the chilled water from the refrigerators 1-1 and 1-2 as TS1 and TS2, 14 is a water supply temperature control device.

  The forward header 3 is composed of a first forward header 3-1 and a second forward header 3-2. Between the forward headers 3-1 and 3-2, cold water from the forward header 3-1 is provided. Secondary pumps 15-1 and 15-2 and a valve 16 are provided. The return header 8 includes a first return header 8-1 and a second return header 8-2, and a flow meter 12 is provided between the return headers 8-1 and 8-2.

  In this heat source system, the return water pumped by the primary pumps 2-1 and 2-2 is cooled to a required temperature by the refrigerators 1-1 and 1-2 and mixed in the forward header 3, and the forward water pipe It is supplied to the load device 5 via the path 4. And it heat-exchanges in the load apparatus 5, returns to the return header 8 via the return water pipe 6, is pumped again by the primary pumps 2-1 and 2-2, and circulates the above path | route.

  The water supply temperature control device 14 also provides information such as the water supply temperature TS from the water supply temperature sensor 10, the return water temperature TR from the return water temperature sensor 11, the load flow rate F from the flow meter 12, and the opening θ of the chilled water valve 7. Is input, the current water supply state to the load device 5 is comprehensively determined, the set water supply temperature TSsp is determined from the determined total water supply state, and the water supply temperature TS is made to coincide with the determined set water supply temperature TSsp. In addition, the outlet temperatures TS1 and TS2 of the cold water from the refrigerators 1-1 and 1-2 are operated. For example, if the set water supply temperature TSsp is relaxed from 7 ° C. to 8.5 ° C., the set values TS1sp and TS2sp of the cold water outlet temperatures of the refrigerators 1-1 and 1-2 are changed from 7 ° C. to 8.5 ° C. To do. Thereby, the COP of the refrigerators 1-1 and 1-2 is improved and energy saving is achieved.

Japanese Patent Laid-Open No. 11-63631

  However, in the conventional heat source system described above, the set value TS1sp of the outlet temperature of the chilled water of the refrigerators 1-1 and 1-2 is not considered without considering the energy cost per unit generated heat amount of the refrigerators 1-1 and 1-2. , TS2sp are set to the same value and are alleviated at the same time, the load factors of the refrigerators 1-1 and 1-2 are the same, and energy saving as expected cannot be expected.

  For example, it is assumed that the refrigerator 1-1 is a device (low COP machine) having a large energy cost per unit generated heat, and the refrigerator 1-2 is a device (high COP machine) having a small energy cost per unit generated heat ( (See FIG. 14). In this case, when both the set values TS1sp and TS2sp of the cold water outlet temperatures of the refrigerators 1-1 and 1-2 are relaxed from 7 ° C. to 8.5 ° C., the COPs of the refrigerators 1-1 and 1-2 are improved. . However, the load factors of the refrigerators 1-1 and 1-2 are the same (for example, 70%), and the cost of generating cold / hot water in the refrigerator 1-1 (low COP machine) and the refrigerator 1-2 (high COP) There is still room for reduction in the total energy cost combined with the cost of generating cold / hot water in the machine.

  In addition, although the example mentioned above demonstrated by the example which produces | generates cold water with a refrigerator (cooling heat source machine), the same problem arises also when producing | generating warm water with a heating machine (heat source machine). Moreover, the same problem arises when a refrigerator and a heat storage tank are used in combination, or when a heat generator and a heat storage tank are used in combination.

  The present invention has been made to solve such a problem, and the object of the present invention is to provide a heat source in which a device having a large energy cost per unit generated heat and a device having a small energy cost per unit generated heat are mixed. It is an object of the present invention to provide a water supply temperature control apparatus and method capable of reducing the total energy cost and further saving energy.

In order to achieve such an object, the present invention includes a first device having a large energy cost per unit generated heat amount and a second device having a lower energy cost per unit generated heat amount than the first device. It is used in a heat source system that mixes the cold / warm water generated by the first device and the cold / warm water generated by the second device and supplies the load device to the load device, and sets the water supply temperature of the cold / warm water supplied to the load device. In the water supply temperature control apparatus that operates the outlet temperature of the cold / hot water from the first device and the second device so as to match the water supply temperature, the second energy cost per unit generated heat is small when the set water supply temperature is relaxed. of the first device is greater energy cost per unit produced heat is given priority than equipment, which was to alleviate the set value of the outlet temperature of the hot and cold water of the equipment,請The invention according to Item 1 is an outlet temperature table that defines a relationship between an operation amount of water supply temperature control, a set value of the outlet temperature of the cold / hot water of the first device, and a set value of the outlet temperature of the cold / hot water of the second device. And the setting value of the outlet temperature of the cold / hot water of the first device and the setting value of the outlet temperature of the cold / hot water of the second device corresponding to the operation amount of the water supply temperature control are obtained from the outlet temperature table, The invention according to Item 2 is an outlet that defines the relationship between the excess / deficiency of the capacity of the cold / hot water, the set value of the exit temperature of the cool / warm water of the first device, and the set value of the exit temperature of the cool / warm water of the second device. Using the temperature table, the set value of the outlet temperature of the cold / hot water of the first device and the set value of the outlet temperature of the cold / hot water of the second device corresponding to the excess / deficiency of the capacity of the cold / hot water are obtained from the outlet temperature table. It is what I did. In this case, in the outlet temperature table, the set value of the outlet temperature of the cold / hot water of the first device and the set value of the outlet temperature of the cold / hot water of the second device are set to the set value of the outlet temperature of the cold / hot water of the first device. Is prioritized over the set value of the outlet temperature of the cold / hot water of the second device and relaxed. Moreover, the invention which concerns on Claim 3 compares the measured value of the water supply temperature of the cold / hot water supplied to a load apparatus, and setting water supply temperature, and is set water supply temperature more energy-saving direction than the measured value of water supply temperature? Whether or not the set value of the current outlet temperature of the cold / hot water from the first device has reached the relaxation limit when it is determined that the set water supply temperature is more energy-saving than the measured value of the water supply temperature. If the relaxation limit has not been reached, the set value of the outlet temperature of the cold water for the first device is relaxed. If the relaxation temperature has been reached, the outlet for the cold water for the second device The set value of temperature is relaxed.

  According to this invention, for example, the first device is a refrigerator (low COP machine) having a large energy cost per unit generated heat, and the second device is a refrigerator (high COP machine) having a small energy cost per unit generated heat. When the set water supply temperature is relaxed, the set value of the outlet temperature of the cold water of the low COP machine is relaxed before the high COP machine. Thereby, the temperature difference of the return water of the low COP machine is reduced, the temperature difference of the return water of the high COP machine is increased, and as a result, the load factor of the low COP machine is lowered and the load factor of the high COP machine is raised. The total energy cost is reduced and further energy saving is achieved.

  In the present invention, the first device and the second device may be a heat machine, the first device is a refrigerator, the second device is a heat storage tank, the first device is a heat machine, and the second device. It is also possible to use as a heat storage tank. In a configuration that combines a heat source machine (refrigerator, thermal machine) and a heat storage tank, if the set water supply temperature is relaxed, the heat source machine (equipment with a small energy cost per unit generated heat) will be The setting value of the outlet temperature of cold / hot water (equipment with a large energy cost per unit generated heat) is relaxed, the load factor of the heat source unit is lowered, the load factor of the heat storage tank is raised, the total energy cost is reduced, and further energy saving Is planned. It is also conceivable that the first device is a normal heat source device (a heat source device using gas or electricity as an energy source) and the second device is an exhaust heat input type heat source device. In this case, when the set water supply temperature is relaxed, the energy cost per unit generated heat is larger than the normal heat source unit (equipment with lower energy cost per unit generated heat) than the exhaust heat input type heat source unit (equipment with lower energy cost per unit generated heat). Equipment) cold / hot water outlet temperature setting value is relaxed, the load factor of normal heat source equipment is lowered, the load factor of exhaust heat input type heat source equipment is raised, the total energy cost is reduced, and further energy saving is planned It is done.

In the present invention (invention according to claims 1 to 3), an energy cost per unit generated heat amount of each device is calculated, and unit generation is performed based on the calculated energy cost per unit generated heat amount of each device. A device having a larger energy cost per heat amount may be determined as the first device, and a device having a smaller energy cost per unit generated heat amount may be determined as the second device.

  According to the present invention, when the set water supply temperature is relaxed, priority is given to the first device having a large energy cost per unit generated heat amount over the second device having a small energy cost per unit generated heat amount, and the cold temperature of the device is reduced. Since the set value of the water outlet temperature is relaxed, the load factor of the second device having a large energy cost per unit generated heat amount is lowered, and the load factor of the second device having a small energy cost per unit generated heat amount As a result, the total energy cost can be reduced and further energy saving can be achieved.

It is an instrumentation figure showing one embodiment (embodiment 1) of a heat source system using a water supply temperature control device concerning the present invention. It is a flowchart for demonstrating the water supply temperature control function which the water supply temperature control apparatus in this heat source system has. In this heat source system, the set value of the outlet temperature of the chilled water of a refrigerator (low COP machine) with a large energy cost per unit generated heat is relaxed before a refrigerator (high COP machine) with a small energy cost per unit generated heat It is a figure which shows the state which carried out. It is a figure which shows the example (Embodiment 2) which combined the normal refrigerator (the energy cost per unit production | generation calorie | heat amount) and the exhaust heat input type refrigerator (the energy cost per unit production | generation heat amount is small). It is a figure which shows the example (Embodiment 3) which combined the refrigerator (high energy cost per unit production | generation heat amount) and the thermal storage tank (low energy cost per unit production | generation heat amount). FIG. 5 is a flowchart (Embodiment 4) showing a first example (use example 1) when an outlet temperature table is used in determining the set value of the outlet temperature of cold water in the refrigerator in the heat source system shown in FIG. is there. It is a figure which shows an example of the exit temperature table utilized in Embodiment 4. It is a figure which shows another example of the exit temperature table utilized in Embodiment 4. FIG. FIG. 5 is a flowchart (Embodiment 5) showing a second example (use example 2) when the outlet temperature table is used in determining the set value of the outlet temperature of the cold water of the refrigerator in the heat source system shown in FIG. is there. It is a figure which shows an example of the exit temperature table utilized in Embodiment 5. It is a figure which shows another example of the exit temperature table utilized in Embodiment 5. FIG. FIG. 10 is a flowchart (Embodiment 6) in a case where the set value of the outlet temperature of the cold water of the refrigerator is automatically calculated in the heat source system shown in FIG. It is an instrumentation figure which shows an example of the conventional heat source system which implemented VWT control. It is a figure explaining the change condition of the setting value of the exit temperature of the refrigerator at the time of relaxation of the setting water supply temperature in the conventional heat source system which implemented VWT control.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, in the following description, what is not included in the scope of the right of the present invention is described as an embodiment, but here, it will be described as an embodiment.
[Embodiment 1]
FIG. 1 is an instrumentation diagram showing an embodiment of a heat source system using a water supply temperature control device according to the present invention. In the figure, the same reference numerals as those in FIG. 13 denote the same or equivalent components as those described with reference to FIG. 13, and the description thereof will be omitted. In FIG. 1, the water temperature controller according to the present invention is indicated by reference numeral 17 in order to distinguish it from the water temperature controller 14 in the conventional heat source system shown in FIG. 13.

  This water supply temperature control device 17 is realized by hardware composed of a processor and a storage device, and a program that realizes various functions as a control device in cooperation with these hardware. There is a water supply temperature control function for operating the outlet temperatures TS1 and TS2 of the cold water from the refrigerators 1-1 and 1-2 so that the water supply temperature TS of the cold water to the load device 5 matches the set water supply temperature Tsp. .

  In this heat source system, the refrigerator 1-1 is a low COP machine (equipment with a large energy cost per unit generated heat amount), and the refrigerator 1-2 is a high COP machine (the energy cost per unit generated heat amount is small). Equipment). Further, as the current water supply temperature setting state in the water supply temperature control device 17, the set water supply temperature Tsp of cold water to the load device 5 is 7 ° C., and the set value TS1sp of the cold water outlet temperature of the refrigerators 1-1 and 1-2. , TS2sp is assumed to be 7 ° C.

  Hereinafter, according to the flowchart shown in FIG. 2, the water supply temperature control function which the water supply temperature control apparatus 17 which concerns on this invention has is demonstrated.

  The water supply temperature control device 17 inputs information such as the water supply temperature TS from the water supply temperature sensor 10, the return water temperature TR from the return water temperature sensor 11, the load flow rate F from the flow meter 12, and the opening degree θ of the cold water valve 7. Then, the current water supply state to the load device 5 is comprehensively determined, and the set water supply temperature TSsp is determined from the determined total water supply state (step S101). In this example, it is assumed that the set water supply temperature TSsp is determined as 8.5 ° C.

  In this example, the set water supply temperature TSsp is automatically determined. However, it may be considered that the facility administrator manually sets the set water supply temperature TSsp. Further, as a method for automatically determining the set water supply temperature TSsp, Patent Document 1 discloses that the air conditioning of each air conditioner is based on the opening state of the cold water valve, the supply air temperature deviation, the convergence state of the supply air temperature deviation, the indoor humidity, and the like. The system status is determined, the total water supply state is determined from the air conditioner status, and the set water supply temperature TSsp is determined from the determined total water supply state, and such a system may be adopted. Good.

  When the set water supply temperature TSsp is determined to be 8.5 ° C. (step S101), the water supply temperature control device 17 distinguishes the low COP machine as the mitigation priority machine and the high COP machine as the mitigation post-rotation machine, and the refrigerator 1-1. , 1-2, the set values TS1sp and TS2sp of the outlet temperature of the cold water are determined (step S102).

  In this case, the refrigerator 1-1, which is a low COP machine, is a mitigation priority machine, and the refrigerator 1-2, which is a high COP machine, is a post-relaxation machine. Then, the set value TS2sp of the cold water outlet temperature of the refrigerator 1-2 (relieving and rotating machine) is kept at 7 ° C., and in this state, the set water supply temperature TSsp (8.5 ° C.) determined in step S101. The set value TS1sp of the outlet temperature of the chilled water of the refrigerator 1-1 (relaxation priority machine) that can secure the above is obtained.

  In this example, the set value TS1sp of the cold water outlet temperature of the refrigerator 1-1 is obtained as 10 ° C. by proportional distribution with the set value TS2sp = 7 ° C. In other words, the set value TS1sp of the chilled water outlet temperature of the refrigerator 1-1 (relaxation priority machine) is determined as 10 ° C., and the set value TS2sp of the chilled water outlet temperature of the chiller 1-2 (relief rotation machine) is 7 ° C. As determined.

  Then, the water supply temperature control device 17 outputs the determined outlet temperature set values TS1sp and TS2sp to the refrigerators 1-1 and 1-2 (step S103). That is, the setting value TS2sp of the cold water outlet temperature of the refrigerator 1-2 is not changed to 7 ° C, but only the setting value TS1sp of the cold water outlet temperature of the refrigerator 1-1 is changed from 7 ° C to 10 ° C. (See FIG. 3).

  Thereby, the set value of the outlet temperature of the cold water of the refrigerator 1-1 (low COP machine) is relaxed before the refrigerator 1-2 (high COP machine), and the temperature of the return water of the refrigerator 1-1 A difference becomes small and the temperature difference of the return water of the refrigerator 1-2 becomes large. As a result, the load factor of the refrigerator 1-1 (low COP machine) decreases (for example, 40%), the load factor of the refrigerator 1-2 (high COP machine) increases (for example, 100%), and the total energy Costs are reduced, and further energy savings (reduction of energy usage fees, reduction of CO2 emissions) are achieved.

[Embodiment 2]
In the heat source system shown in FIG. 1, the refrigerator 1-1 is a low COP machine and the refrigerator 1-2 is a high COP machine. However, as shown in FIG. A normal type refrigerator using gas or electricity) and the refrigerator 1-2 may be a waste heat input type refrigerator. In this case, when the set water supply temperature TSsp is relaxed, the normal refrigerator 1-1 (unit generation) is preceded by the exhaust heat input type refrigerator 1-2 (equipment with a small energy cost per unit generated heat amount). The set value of the outlet temperature of the chilled water of a device having a large energy cost per calorie is eased. Thereby, the load factor of the normal refrigerator 1-1 decreases, the load factor of the exhaust heat input type refrigerator 1-2 increases, the total energy cost is reduced, and further energy saving is achieved.

[Embodiment 3]
Moreover, as shown in FIG. 5, it is good also as a structure which combined the refrigerator 1 and the thermal storage tank 18. As shown in FIG. In this case, when the set water supply temperature TSsp is relaxed, the chilled water of the refrigerator 1 (equipment with a large energy cost per unit generated heat) is prior to the heat storage tank 18 (equipment with a small energy cost per unit generated heat). The set value of the outlet temperature is relaxed. Thereby, the load factor of the refrigerator 1 decreases, the load factor of the heat storage tank 18 increases, the total energy cost is reduced, and further energy saving is achieved.

[Embodiment 4: Usage example 1 of outlet temperature table]
FIG. 6 shows a first example in which the outlet temperature table is used in determining the set values TS1sp and TS2sp of the cold water outlet temperatures of the refrigerators 1-1 and 1-2 in the heat source system shown in FIG. The flowchart (Embodiment 4) of (Usage example 1) is shown.

  In the use example 1 of the outlet temperature table, the water supply temperature control device 17 determines the set water supply temperature TSsp in the same manner as in step S101 (FIG. 2) described above (step S201), and the water supply temperature TS from the water supply temperature sensor 10 is determined. Is obtained as the measured value TSpv of the water supply temperature (step S202), and the operation amount (PID output value) ΔP of the water supply temperature control is calculated from the difference between the determined set water supply temperature TSsp and the acquired measured value TSpv of the water supply temperature. (Step S203).

  Then, the water supply temperature control device 17 uses the outlet temperature table TB1 (see FIG. 7) that defines the relationship between the outlet temperature setting values TS1sp and TS2sp to set the outlet temperature setting value TS1sp corresponding to the operation amount ΔP of the water supply temperature control. TS2sp is acquired (step S204), and the acquired outlet temperature set values TS1sp and TS2sp are output to the refrigerators 1-1 and 1-2 (step S205).

The outlet temperature table TB1 (FIG. 7) used in step S204 is stored in the memory in the water supply temperature control device 17. In this outlet temperature table TB1, the horizontal axis is the operation amount (PID output value) ΔP of the water supply temperature control, the vertical axis is the outlet temperature (set value) of the cold water from the refrigerator, and the outlet of the cold water of the refrigerator 1-1 A characteristic I indicating a set value TS1sp of the temperature and a characteristic II indicating a set value TS2sp of the outlet temperature of the chilled water of the refrigerator 1-2 are configured. The operation amount ΔP of the water supply temperature control is represented by an operation amount ΔP ⁺ in the direction of increasing the water supply temperature and an operation amount ΔP ⁻ in the direction of decreasing, and changes with a point indicated by a black triangle in the figure as a base point. The relationship between the set values TS1sp and TS2sp of the outlet temperature of the cold water of the refrigerators 1-1 and 1-2 is shown by these characteristics I and II.

  In this outlet temperature table TB1, the setting value TS1sp of the cold water outlet temperature of the refrigerator 1-1 and the setting value TS2sp of the cold water outlet temperature of the refrigerator 1-2 are the settings of the outlet temperature of the cold water of the refrigerator 1-1. The value TS1sp is prioritized over the set value TS2sp of the cold water outlet temperature of the refrigerator 1-2 and relaxed.

In this example, the characteristics I and II in the outlet temperature table TB1 are set such that the lower limit value of the chilled water outlet temperature TS1sp and TS2sp is 7 ° C., the upper limit value is 12 ° C., and the operation amount ΔP of the water supply temperature control ΔP ⁻ to changes in the [Delta] P ⁺ direction from the set value TS1sp lower limit of the cold water outlet temperature of the refrigerator 1-1 above to the upper limit continue to rise at a predetermined slope, the set value TS1sp this increased When reaching the upper limit, the set value TS2sp of the outlet temperature of the chilled water of the refrigerator 1-2 is set to increase at a predetermined slope from the lower limit to the upper limit.

By using the outlet temperature table TB1 as described above, the refrigerator 1-2 (higher than the relaxation of the set water supply temperature) with respect to the change in the operation amount ΔP of the water supply temperature control from ΔP ⁻ to ΔP ⁺ direction (relaxation of the set water supply temperature). Prior to the COP machine, the set value of the outlet temperature of the cold water of the refrigerator 1-1 (low COP machine) is relaxed. Thereby, the temperature difference of the return water of the refrigerator 1-1 becomes small, the temperature difference of the return water of the refrigerator 1-2 becomes large, As a result, the load factor of the refrigerator 1-1 (low COP machine) is increased. The load factor of the refrigerator 1-2 (high COP machine) is increased, the total energy cost is reduced, and further energy saving is achieved.

  In the outlet temperature table TB1 shown in FIG. 7, when the set value TS1sp of the chilled water outlet temperature of the refrigerator 1-1 reaches the upper limit value, the set value TS2sp of the chilled water outlet temperature of the refrigerator 1-2 is reached. Rise in the outlet temperature table TB2 as shown in FIG. 8, and during the rise in the set value TS1sp of the outlet temperature of the cold water of the refrigerator 1-1, the cold water of the refrigerator 1-2 An increase in the outlet temperature set value TS2sp may be started.

[Embodiment 5: Usage example 2 of outlet temperature table]
FIG. 9 shows a second example in which the outlet temperature table is used in determining the set values TS1sp and TS2sp of the cold water outlet temperatures of the refrigerators 1-1 and 1-2 in the heat source system shown in FIG. The flowchart (Embodiment 5) of (Use Example 2) is shown.

  In the use example 2 of the outlet temperature table, the water supply temperature control device 17 acquires the opening θ of the cold water valve 7 as the air conditioner valve opening (step S301), and the air conditioner valve opening θ is 80% or more. It is confirmed whether or not there is (step S302).

If the air conditioner valve opening θ is 80% or more (YES in step S302), it is determined that the capacity is insufficient (step S303), and the insufficient capacity amount ΔPW ⁻ at that time is calculated. If the air conditioner valve opening degree θ is less than 80% (NO in step S302), it is determined that the capacity is excessive (step S304), and the capacity excess amount ΔPW ⁺ at that time is calculated.

Then, the water supply temperature control device 17 uses the outlet temperature table TB3 (see FIG. 10) that defines the relationship between the outlet temperature set values TS1sp and TS2sp (see FIG. 10), the capacity excess / deficiency ΔPW (ΔPW ⁻ ) calculated in steps S303 and S304. , ΔPW ⁺ ), the outlet temperature set values TS1sp and TS2sp are acquired (step S305), and the acquired outlet temperature set values TS1sp and TS2sp are output to the refrigerators 1-1 and 1-2 (step S305). S306).

The outlet temperature table TB3 (FIG. 10) used in step S305 is stored in the memory in the water supply temperature control device 17. In this outlet temperature table TB3, the horizontal axis is the excess / deficiency ΔPW of the capacity of the cold water supplied to the load device 5, the vertical axis is the outlet temperature (set value) of the cold water from the refrigerator, and It consists of a characteristic III indicating the set value TS1sp of the cold water outlet temperature and a characteristic IV indicating the set value TS2sp of the cold water outlet temperature of the refrigerator 1-2. The excess / deficiency amount ΔPW of the capacity of the cold water is represented by an insufficient amount of capability ΔPW ⁻ and an excess amount of capability ΔPW ^+, and changes based on a point indicated by a black triangle in the figure. The relationship between the set values TS1sp and TS2sp of the outlet temperature of the cold water of the refrigerators 1-1 and 1-2 is shown by these characteristics III and IV.

  In this outlet temperature table TB3, the setting value TS1sp of the cold water outlet temperature of the refrigerator 1-1 and the setting value TS2sp of the cold water outlet temperature of the refrigerator 1-2 are the setting of the outlet temperature of the cold water of the refrigerator 1-1. The value TS1sp is prioritized over the set value TS2sp of the cold water outlet temperature of the refrigerator 1-2 and relaxed.

In this example, characteristics III and IV in the outlet temperature table TB3 indicate that the lower limit value of the chilled water outlet temperature TS1sp and TS2sp is 7 ° C., the upper limit value is 12 ° C., and the chilled water capacity is insufficient or insufficient ΔPW. the amount? Pw ^- to the change to excess? Pw ⁺ direction, the set value of the cold water outlet temperature of the refrigerator 1-1 above TS1sp is gradually increased at a predetermined inclination from the lower limit to the upper limit, the increase Thus, when the set value TS1sp reaches the upper limit value, the set value TS2sp of the outlet temperature of the chilled water of the refrigerator 1-2 is increased from the lower limit value to the upper limit value with a predetermined slope.

By using such an outlet temperature table TB3, refrigeration is performed with respect to a change from the deficient amount ΔPW− of the excess / deficiency amount ΔPW ⁻ of the capacity of the chilled water to the excessive amount ΔPW ⁺ (relaxation of the set water supply temperature). Prior to the machine 1-2 (high COP machine), the set value of the outlet temperature of the cold water of the refrigerator 1-1 (low COP machine) is relaxed. Thereby, the temperature difference of the return water of the refrigerator 1-1 becomes small, the temperature difference of the return water of the refrigerator 1-2 becomes large, As a result, the load factor of the refrigerator 1-1 (low COP machine) is increased. The load factor of the refrigerator 1-2 (high COP machine) is increased, the total energy cost is reduced, and further energy saving is achieved.

In the outlet temperature table TB3 shown in FIG. 10, when the set value TS1sp of the chilled water outlet temperature of the refrigerator 1-1 reaches the upper limit value, the set value TS2sp of the chilled water outlet temperature of the refrigerator 1-2 is reached. 11 is started, the outlet temperature table TB4 as shown in FIG. 11 is used, and the chilled water of the refrigerator 1-2 is being increased while the set value TS1sp of the outlet temperature of the chilled water 1-1 is increased. An increase in the outlet temperature set value TS2sp may be started. Alternatively, floating control may be performed by setting a center point (a point indicated by a black triangle) between the deficiency amount ΔPW ⁻ and the deficiency amount ΔPW ⁺ as a floating point.

[Embodiment 6: Automatic calculation of set value of outlet temperature]
FIG. 12 shows a case where the set values TS1sp and TS2sp of the chilled water outlet temperatures of the refrigerators 1-1 and 1-2 are automatically calculated without using the outlet temperature table in the heat source system shown in FIG. The flowchart (Embodiment 6) is shown.

In this example, the water supply temperature control device 17 calculates the heat generation unit price of the refrigerators 1-1 and 1-2 based on the actual values of the refrigerator energy use amount and the refrigerator generated heat amount (step S401). In this example, the heat generation unit price of the refrigerators 1-1 and 1-2 is obtained using the following equation (1).
Heat generation unit price = (Refrigerator energy consumption x Energy unit price) / Refrigerator generated heat amount (1)

  Then, the device with the larger heat generation unit price obtained is set as the mitigation priority machine, and the device with the smaller heat generation unit price is set as the post-reduction machine (step S402). In this example, since the refrigerator 1-1 is a low COP machine and the refrigerator 1-2 is a high COP machine, the refrigerator 1-1 is determined as the relaxation priority machine, and the refrigerator 1-2 is rotated after the relaxation. Determined as a machine.

  In addition, when the magnitude relationship of the energy cost per unit generated heat amount of the refrigerators 1-1 and 1-2 is known, by previously setting the relationship in the water supply temperature control device 17 by manual setting or the like, The calculation of the heat generation unit price in step S401 and the determination of the device type in step S402 can be omitted.

  Next, the water supply temperature control device 17 determines the set water supply temperature TSsp in the same manner as the above-described step S101 (FIG. 2) (step S403), and the water supply temperature TS from the water supply temperature sensor 10 is measured as the water supply temperature measurement value TSpv. (Step S404), and the acquired measured value TSpv of the water supply temperature is compared with the determined set water supply temperature TSsp (step S405).

[When TSsp ≧ TSpv]
Here, when the set water supply temperature TSsp is equal to or higher than the measured value TSpv of the water supply temperature (NO in step S405), the set value TS1sp of the current cold water outlet temperature of the mitigation priority machine 1-1 is the upper limit value (relaxation limit ( For example, it is confirmed whether or not the temperature has reached 12 ° C.) (step S406).

  If the set value TS1sp of the current cold water outlet temperature of the mitigation priority machine 1-1 has not reached the upper limit (NO in step S406), the set value TS1sp of the cold water outlet temperature of the mitigation priority machine 1-1 is increased ( Step S407). That is, the cold water outlet temperature set value TS1sp of the relaxation priority machine 1-1 is relaxed. Then, the relaxed outlet temperature set value TS1sp is output to the mitigation priority machine 1-1 (step S412).

  If the set value TS1sp of the current cold water outlet temperature of the mitigation priority machine 1-1 has reached the upper limit value (YES in step S406), the set value TS2sp of the cold water outlet temperature of the post-relaxation machine 1-2 is increased ( Step S408). That is, the set value TS2sp of the outlet temperature of the cold water of the post-relaxation machine 1-2 is relaxed. Then, the relaxed outlet temperature set value TS2sp is output to the post-relaxation machine 1-2 (step S412).

[When TSsp <TSpv]
When the set water supply temperature TSsp is lower than the measured value TSpv of the water supply temperature (YES in step S405), the set value TS2sp of the current cold water outlet temperature of the post-relaxation machine 1-2 is set to the lower limit value (for example, 7 ° C.). It is confirmed whether or not it has been reached (step S409).

  If the setting value TS2sp of the current chilled water outlet of the post-relaxation rotating machine 1-2 has not reached the lower limit value (NO in step S409), the setting value TS2sp of the chilled water outlet of the post-relaxation rotating machine 1-2 is lowered ( Step S410). Then, the lowered outlet temperature set value TS2sp is output to the post-relaxation machine 1-2 (step S412).

  If the set value TS2sp of the current cold water outlet temperature of the post-relaxation machine 1-2 has reached the lower limit (YES in step S409), the set value TS1sp of the cold water outlet temperature of the relaxation priority machine 1-1 is lowered ( Step S411). Then, the lowered outlet temperature set value TS1sp is output to the relaxation priority machine 1-1 (step S412).

  In the above description, the range of increase in the setting value TS1sp of the chilled water outlet temperature of the mitigation priority machine 1-1 in step S407, the amount of increase in the setting value TS2sp of the chilled water outlet temperature of the post-relaxation machine 1-2 in step S408, step The lowering range of the chilled water outlet temperature set value TS2sp of the relaxation rotating machine 1-2 in S410, and the lowering range of the chilled water outlet temperature setting value TS1sp of the relaxation prioritizing machine 1-1 in step S411 are set in advance as predetermined values. It has been established. Further, the processing operations in steps S403 to S412 are repeated at a predetermined cycle.

  In this way, in the sixth embodiment, the set values TS1sp and TS2sp of the chilled water outlet temperatures of the refrigerators 1-1 and 1-2 are automatically calculated, and steps S406 to S408 are performed for the relaxation of the set water supply temperature TSsp. As shown in the process, the set value of the outlet temperature of the cold water of the refrigerator 1-1 (low COP machine) is relaxed prior to the refrigerator 1-2 (high COP machine). Thereby, the temperature difference of the return water of the refrigerator 1-1 becomes small, the temperature difference of the return water of the refrigerator 1-2 becomes large, As a result, the load factor of the refrigerator 1-1 (low COP machine) is increased. The load factor of the refrigerator 1-2 (high COP machine) increases, the total energy cost is reduced, and further energy saving is achieved.

  In addition, although Embodiment 1-6 mentioned above demonstrated by the example which wants to use a refrigerator as a heat source machine, it cannot be overemphasized that it can be comprised similarly also when using a heating machine.

  In Embodiments 1 to 5, as in Embodiment 6, the type of the device may be determined by calculating the unit price of heat generation of the device that generates the cold water. Further, the type of the device may be determined based on the CO2 emission amount or the primary energy.

  Moreover, in Embodiment 1-6 mentioned above, although the apparatus which produces | generates cold water was made into two units, the apparatus which produces | generates cold water is not restricted to two units | sets, You may increase the number further.

  In the fifth embodiment, the opening degree θ of the cold water valve 7 is acquired as the air conditioner valve opening degree, and the current capacity of the cold water being supplied to the load device 5 from the acquired air conditioner valve opening degree θ is excessive or insufficient. Although the amount is obtained, the excess / deficiency amount of the current cold water being supplied to the load device 5 may be obtained by another method.

  The water supply temperature control device and method of the present invention can be used in various heat source systems using a refrigerator, a thermal machine, a heat storage tank, etc. as a water supply temperature control device and method for controlling the water supply temperature to a load device. It is.

  DESCRIPTION OF SYMBOLS 1,1-1,1-2 ... Refrigerator, 2-1, 2-2 ... Primary pump, 3 (3-1, 3-2) ... Out header, 4 ... Outbound pipe line, 5 ... Load equipment, 6 ... Return water pipe, 7 ... Cold water valve, 8 (8-1, 8-2) return header, 9 ... Bypass pipe, 10 ... Water supply temperature sensor, 11 ... Return water temperature sensor, 12 ... Flow meter, 13- DESCRIPTION OF SYMBOLS 1,13-2 ... Refrigerator exit temperature sensor, 15-1, 15-2 ... Secondary pump, 16 ... Valve, 17 ... Water supply temperature control apparatus, 18 ... Heat storage tank, TB1-TB4 ... Outlet temperature table.

Claims (8)

A first device having a large energy cost per unit generated heat and a second device having a smaller energy cost per unit generated heat than the first device, and cold / hot water generated by the first device; It is used in a heat source system that mixes cold / hot water generated by the second device and supplies it to the load device, and the water supply temperature of the cold / warm water supplied to the load device matches the set water supply temperature. In the water supply temperature control device for operating the outlet temperature of the cold / hot water from the device and the second device,
An operation amount calculating means for calculating an operation amount of water supply temperature control from a difference between a measured value of the water supply temperature of the cold / hot water supplied to the load device and the set water supply temperature,
Stores an outlet temperature table in which the relationship between the operation amount of the water supply temperature control, the set value of the outlet temperature of the cold / hot water of the first device, and the set value of the outlet temperature of the cold / hot water of the second device is determined. Outlet temperature table storage means;
The setting value of the outlet temperature of the chilled / hot water of the first device and the outlet temperature of the chilled / hot water of the second device according to the operation amount of the water supply temperature control calculated by the operation amount calculating means from the outlet temperature table Cold water supply outlet temperature set value acquisition means for acquiring a value,
In the outlet temperature table, the set value of the outlet temperature of the cold / hot water of the first device and the set value of the outlet temperature of the cold / hot water of the second device are set of the outlet temperature of the cold / hot water of the first device. A water supply temperature control device characterized in that the value is relaxed in preference to the set value of the outlet temperature of the cold / hot water of the second device. A first device having a large energy cost per unit generated heat and a second device having a smaller energy cost per unit generated heat than the first device, and cold / hot water generated by the first device; It is used in a heat source system that mixes cold / hot water generated by the second device and supplies it to the load device, and the water supply temperature of the cold / warm water supplied to the load device matches the set water supply temperature. In the water supply temperature control device for operating the outlet temperature of the cold / hot water from the device and the second device,
Cold / hot water capacity calculating means for calculating the excess / deficiency of the current cold / hot water capacity being supplied to the load device;
An outlet temperature table in which the relationship between the excess / deficiency of the capacity of the cold / hot water, the set value of the outlet temperature of the cold / hot water of the first device, and the set value of the outlet temperature of the cold / hot water of the second device is defined. Outlet temperature table storage means for storing;
The set value of the outlet temperature of the cold / hot water of the first device and the outlet of the cold / hot water of the second device according to the excess / deficiency of the cold / hot water capacity calculated by the cold / hot water capacity calculating means from the outlet temperature table Cold water supply outlet temperature set value acquisition means for acquiring a set value of temperature,
In the outlet temperature table, the set value of the outlet temperature of the cold / hot water of the first device and the set value of the outlet temperature of the cold / hot water of the second device are set of the outlet temperature of the cold / hot water of the first device. A water supply temperature control device characterized in that the value is relaxed in preference to the set value of the outlet temperature of the cold / hot water of the second device. A first device having a large energy cost per unit generated heat and a second device having a smaller energy cost per unit generated heat than the first device, and cold / hot water generated by the first device; It is used in a heat source system that mixes cold / hot water generated by the second device and supplies it to the load device, and the water supply temperature of the cold / warm water supplied to the load device matches the set water supply temperature. In the water supply temperature control device for operating the outlet temperature of the cold / hot water from the device and the second device,
Comparison determination means for comparing the measured value of the water supply temperature of the cold / hot water supplied to the load device with the set water supply temperature, and determining whether the set water supply temperature is in an energy saving direction from the measured value of the water supply temperature; ,
When it is determined by the comparison determination means that the set water supply temperature is in an energy saving direction from the measured value of the water supply temperature, the current set value of the outlet temperature of the cold / hot water from the first device reaches the relaxation limit. If the relaxation limit is not reached, the set value of the outlet temperature of the cold / hot water of the first device is relaxed. If the relaxation limit is reached, the second device is An outlet temperature set value relaxing means for relaxing the set value of the outlet temperature of the cold / hot water of the water supply temperature control device. In the water supply temperature control apparatus described in any one of Claims 1-3,
Energy cost calculation means for calculating an energy cost per unit generated heat amount of each device;
Based on the energy cost per unit generated heat amount of each device calculated by the energy cost calculating means, the device having the larger energy cost per unit generated heat amount is determined as the first device, and the unit per unit generated heat amount is determined. A water supply temperature control apparatus comprising: a device type determining unit that determines a device having a smaller energy cost as the second device. A first device having a large energy cost per unit generated heat and a second device having a smaller energy cost per unit generated heat than the first device, and cold / hot water generated by the first device; The first device is applied to a heat source system that mixes the cold / hot water generated by the second device and supplies the mixture to the load device, and makes the water supply temperature of the cold / hot water supplied to the load device coincide with the set water supply temperature. In the water supply temperature control method of operating the outlet temperature of the cold / hot water from the device and the second device,
An operation amount calculation step for calculating an operation amount of the water supply temperature control from a difference between a measured value of the water supply temperature of the cold / hot water supplied to the load device and the set water supply temperature,
Stores an outlet temperature table in which the relationship between the operation amount of the water supply temperature control, the set value of the outlet temperature of the cold / hot water of the first device, and the set value of the outlet temperature of the cold / hot water of the second device is determined. Outlet temperature table storage step;
The setting value of the outlet temperature of the cold / hot water of the first device and the outlet temperature of the cold / hot water of the second device according to the operation amount of the water supply temperature control calculated by the operation amount calculating step from the outlet temperature table A cold water supply outlet temperature set value acquisition step for acquiring a value,
In the outlet temperature table, the set value of the outlet temperature of the cold / hot water of the first device and the set value of the outlet temperature of the cold / hot water of the second device are set of the outlet temperature of the cold / hot water of the first device. The value is preferentially relaxed in preference to the set value of the outlet temperature of the cold / hot water of the second device.
A method for controlling the water supply temperature . A first device having a large energy cost per unit generated heat and a second device having a smaller energy cost per unit generated heat than the first device, and cold / hot water generated by the first device; The first device is applied to a heat source system that mixes the cold / hot water generated by the second device and supplies the mixture to the load device, and makes the water supply temperature of the cold / hot water supplied to the load device coincide with the set water supply temperature. In the water supply temperature control method of operating the outlet temperature of the cold / hot water from the device and the second device,
A cold / hot water capacity calculating step for calculating an excess / deficiency of the current cold / hot water capacity being supplied to the load device;
An outlet temperature table in which the relationship between the excess / deficiency of the capacity of the cold / hot water, the set value of the outlet temperature of the cold / hot water of the first device, and the set value of the outlet temperature of the cold / hot water of the second device is defined. An outlet temperature table storing step for storing;
The set value of the outlet temperature of the cold / hot water of the first device and the outlet of the cold / hot water of the second device according to the excess / deficiency of the cold / hot water capacity calculated by the cold / hot water capacity calculation step from the outlet temperature table. A cooling / heating water outlet temperature setting value acquisition step for acquiring a temperature setting value;
In the outlet temperature table, the set value of the outlet temperature of the cold / hot water of the first device and the set value of the outlet temperature of the cold / hot water of the second device are set of the outlet temperature of the cold / hot water of the first device. A water supply temperature control method characterized in that the value is relaxed in preference to the set value of the outlet temperature of the cold / hot water of the second device . A first device having a large energy cost per unit generated heat and a second device having a smaller energy cost per unit generated heat than the first device, and cold / hot water generated by the first device; The first device is applied to a heat source system that mixes the cold / hot water generated by the second device and supplies the mixture to the load device, and makes the water supply temperature of the cold / hot water supplied to the load device coincide with the set water supply temperature. In the water supply temperature control method of operating the outlet temperature of the cold / hot water from the device and the second device,
A comparison determination step of comparing the measured value of the water temperature of the cold / hot water supplied to the load device with the set water temperature, and determining whether the set water temperature is in an energy saving direction from the measured value of the water temperature; ,
When it is determined that the set water supply temperature is in an energy saving direction from the measured value of the water supply temperature by this comparison and determination step, the current set value of the outlet temperature of the cold / hot water from the first device has reached the relaxation limit. If the relaxation limit is not reached, the set value of the outlet temperature of the cold / hot water of the first device is relaxed. If the relaxation limit is reached, the second device is A water supply temperature control method comprising: an outlet temperature set value relaxation step for relaxing a set value of the outlet temperature of the cold / hot water . In the water supply temperature control method described in any one of Claims 5-7,
An energy cost calculating step for calculating an energy cost per unit generated heat amount of each device;
Based on the energy cost per unit generated heat amount of each device calculated in this energy cost calculating step, the device having the larger energy cost per unit generated heat amount is determined as the first device, and the unit per unit generated heat amount is determined. A device type determining step for determining a device with a lower energy cost as the second device;
Supply water temperature control method comprising: a.

Images