JP2014202410A - Heat source operation navigation system and method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat source operation navigation system for navigating a heat source system to optimally operate in the entire system in light of each of external/internal factors.SOLUTION: A heat source operation navigation system of the present invention is a system for generating operation patterns of refrigerators and a heat exchanger in a heat source system comprising: a cooling tower supplying cooling water; a plurality of refrigerators setting a temperature of cold water to a predetermined temperature by the cooling water; a cooling water pump supplying the cooling water to the refrigerators; a cold water pump supplying the cold water to a load; the heat exchanger implementing heat exchange between the cold water and the cooling water, and decreasing the temperature of the cold water; a heat exchanger primary pump supplying the cooling water to the heat exchanger; and a heat exchanger secondary pump supplying the cold water to the heat exchanger. The heat source operation navigation system includes a free cooling determination unit comparing COP for determining in what mode the heat source system operates, an operation mode M1 of the refrigerators, an operation mode M2 of a combination of the refrigerators and the heat exchanger, or an operation mode M3 of the heat exchanger, and selecting the operation mode having the lowest COP.

Description

  The present invention relates to a heat source operation navigation system and method for navigating energy saving operation in a heat source system.

  Energy saving at the time of building operation is an important issue. In particular, energy consumed by an air conditioning system reaches 1/3 of the entire building in a general office building, so it is important to save energy in the air conditioning system.

As is well known, in a general central air conditioning system, a chiller (especially a water-cooled chiller using cooling water) is mainly used as a heat source, and a cooling tower, a cooling water pump, a chilled water pump, etc. The heat source system is configured with the auxiliary machine.
Each of these types of refrigerators generally has a load factor that exhibits the highest efficiency. For this reason, it is possible to obtain overall efficiency by operating a plurality of refrigerators rather than handling all loads with one refrigerator.

  For the heat source system described above, a system that performs the most efficient number control by connecting a plurality of refrigerators in parallel and operating the number corresponding to the load capacity for the operation of the refrigerator that is the heat source unit (For example, refer to Patent Document 1).

  In addition, the temperature of the cooling water fed from the cooling tower to the condenser of the refrigerator fluctuates in accordance with the atmospheric temperature, and therefore becomes low particularly in winter. Therefore, cooling is performed without operating the refrigerator at a time when the temperature of the cooling water after exchanging heat with the atmosphere in the cooling tower becomes equal to the temperature of the cold water after exchanging heat with the refrigerant in the condenser of the refrigerator. There is a free-cooling method that uses the cooling water cooled in the tower to cool the cold water supplied to the load and save energy.

  Whether or not to perform free cooling for the operation of the refrigerator that is the heat source device, depending on the temperature of the cooling water supplied from the cooling tower and the temperature of the cooling water returning from the load to the refrigerator for the heat source system described above There is a system that performs such control (see, for example, Patent Document 2).

JP 2009-008356 A JP 2009-276004 A

The system disclosed in Patent Document 1 described above can perform optimal refrigerator operation control corresponding to load capacity. Further, in the centrifugal chiller, a rotational speed control centrifugal chiller using an inverter that saves energy is adopted, and the equipment efficiency in the heat source system is further improved.
However, in Patent Document 1, cold water is supplied to a load only by a turbo refrigerator, so that there is a limit to energy saving.

The system of Patent Document 2 measures the temperature of each of the cold water returning to the refrigerator that is a heat source unit and the cooling water for the refrigerator from the cooling tower, and directly cools the cold water to a predetermined temperature with the cooling water. If it can be done, perform free cooling without operating the refrigerator. For this reason, the system of patent document 2 can perform energy saving more compared with the system of patent document 1.
However, in Patent Document 2, various external and internal factors such as the outside air state, the load condition of the refrigerator, and the characteristics of each device constituting the heat source system including the refrigerator are considered in combination. Absent. Therefore, in Patent Document 2, it is difficult to perform optimal control for realizing the maximum efficiency of the entire heat source system.

  The present invention has been made in view of such circumstances, and considers each of external and internal factors in the heat source system, and a heat source operation navigation system for navigating the optimum operation of the entire heat source system, and An object is to provide such a method.

  The heat source operation navigation system of the present invention includes a cooling tower that supplies cooling water having a first temperature, a plurality of refrigerators that cool inflow cooling water to a predetermined second temperature using the cooling water, and each of the refrigerators. The cooling water pump that supplies the cooling water to the refrigerator, the cooling water pump that is provided for each refrigerator and supplies the cooling water to a load, and the cooling water that flows in and the cooling water A heat exchanger that exchanges and lowers the temperature of the cold water; a heat pump primary pump that is provided in the heat exchanger and that supplies the cooling water to the heat exchanger; and a heat exchanger that is provided in the heat exchanger. A heat source secondary navigation pump that supplies the cold water to the exchanger, and a heat source operation navigation system that generates an operation pattern of the refrigerator and the heat exchanger. In the operation mode M1, the free cooling determination unit for determining whether to operate in the operation mode M2 by the combination of the refrigerator and the heat exchanger, or the operation mode M3 by the heat exchanger, and the operation mode M1 by the refrigerator A refrigerator efficiency calculation unit that calculates a system COP that is an overall COP (coefficient of performance) of the heat source system, a heat exchanger efficiency calculation unit that calculates the system COP in the operation mode M2 by the heat exchanger, the refrigerator, An overall efficiency calculation unit that calculates the system COP in the operation mode M3 by the heat exchanger, and the free cooling determination unit is in any operation mode of the operation mode M1, the operation mode M2, and the operation mode M3. Whether to operate the heat source system depends on the operation mode M1, the operation. Mode M2 and comparing each of COP of the operation mode M3, and selects the operation mode having the lowest COP.

  In the heat source operation navigation system of the present invention, the free cooling determination unit supplies the load with the amount of production heat produced by the heat exchanger calculated by the heat exchanger efficiency calculation unit according to the first temperature of the cooling water. If it is equal to or higher than the load heat amount to be performed, the operation mode of the heat source system is set to the operation mode M3, and if the production heat amount is less than the load heat amount, the operation mode of the heat source system is set to the operation mode M1 or the operation mode M2. It is characterized by determining either.

  In the heat source operation navigation system according to the present invention, the free cooling determination unit determines whether the refrigerator efficiency calculation unit is operated according to the first temperature and the cooling water amount of the cooling water. According to the minimum system COP in the operation mode M1 calculated by adjusting the load factor, the first temperature of the cooling water, and the amount of cooling water, the total efficiency calculating unit manufactures the heat produced by the heat exchanger and the manufacturing Calculate the heat exchanger power consumption when producing heat, and calculate the difference calorific value obtained by subtracting the calorific value from the load calorie by adjusting the number of operating refrigerators and the load factor of the operated refrigerator The power consumption of the refrigerator in the COP is compared with the minimum system COP in the operation mode M2 obtained from the power consumption of the heat exchanger and the power consumption of the refrigerator. P is characterized by selecting a lower operating mode.

  In the heat source operation navigation system of the present invention, when the heat exchanger efficiency calculation unit calculates the system COP in the operation mode M1, the power consumption of the heat exchanger and the cooling as the power consumption for manufacturing the production heat amount are calculated. The power consumption of the cooling tower corresponding to the amount of water, the power consumption of the primary pump of the heat exchanger that causes the cooling water to flow into the heat exchanger from the cooling tower, and the cold water that returns from the load are caused to flow into the heat exchanger. As the power consumption for producing the production heat quantity when the refrigerator efficiency calculation unit calculates the system COP in the operation mode M3 using the total power consumption obtained by adding the power consumption of the heat exchanger secondary pump, The power consumption of the refrigerator being operated, the power consumption of the cooling tower corresponding to the amount of cooling water, and the cooling tower to the refrigerator The total efficiency calculation unit using a total power consumption obtained by adding the power consumption of the cooling water pump into which water flows in and the power consumption of the cold water primary pump by sending the cold water from the refrigerator to the load. However, when calculating the system COP in the operation mode M2, the power consumption of the heat exchanger, the power consumption of the cooling tower corresponding to the amount of the cooling water, and the cooling water is allowed to flow from the cooling tower to the heat exchanger Power consumption of the heat exchanger primary pump, power consumption of the heat exchanger secondary pump that causes the cold water returning from the load to flow into the heat exchanger, and flow of the cooling water from the cooling tower to the refrigerator The power consumption of the cooling water pump and the total power consumption obtained by adding the power consumption of the cold water primary pump by sending the cold water from the refrigerator to the load are used. To.

  The heat source operation navigation method of the present invention includes a cooling tower that supplies cooling water having a first temperature, a plurality of refrigerators that cool inflow cooling water to a predetermined second temperature using the cooling water, and each of the refrigerators. The cooling water pump that supplies the cooling water to the refrigerator, the cooling water pump that is provided for each refrigerator and supplies the cooling water to a load, and the cooling water that flows in and the cooling water A heat exchanger that exchanges and lowers the temperature of the cold water; a heat pump primary pump that is provided in the heat exchanger and that supplies the cooling water to the heat exchanger; and a heat exchanger that is provided in the heat exchanger. In a heat source system comprising a heat exchanger secondary pump for supplying the cold water to an exchanger, a heat source operation navigation method for generating an operation pattern of the refrigerator and the heat exchanger, and free cooling A free cooling determination process for determining whether the fixed unit operates in one of the operation mode M1 by the refrigerator, the operation mode M2 by the combination of the refrigerator and the heat exchanger, and the operation mode M3 by the heat exchanger; A machine efficiency calculation unit calculates a system COP that is an overall COP (coefficient of performance) of the heat source system in the operation mode M1 by the refrigerator, and a heat exchanger efficiency calculation unit uses the heat exchanger. A heat exchanger efficiency calculation process for calculating the system COP in the operation mode M2, and an overall efficiency calculation unit for calculating the system COP in the operation mode M3 by the refrigerator and the heat exchanger. The free cooling determination unit includes the operation mode M1, the operation mode M2, and the operation mode M. The operation mode M1, the operation mode M2, and the operation mode M3 are compared with each other to determine which operation mode the heat source system is operated in, and the operation mode having the lowest COP is selected. And

  According to the present invention, the external and internal factors in the heat source system are taken into account, and the operation for realizing the low power consumption at high speed and with high accuracy in the entire heat source system as compared with the prior art. The operation conditions of the refrigerator and the heat exchanger can be set so as to be in the mode, and the operation of the optimum heat source system that easily reduces the power consumption can be navigated.

The heat source operation navigation system by this embodiment of this invention has shown the heat source system used as the object which produces | generates an operation pattern. It is a figure showing an example of composition of heat source operation navigation system 1 by an embodiment of the present invention. It is a flowchart which shows the operation example which calculates | requires the optimal operating condition in the determination of the operation mode of the heat source system by the heat source operation navigation system 1 by embodiment of this invention, and an operation mode. The cooling water temperature which can be free-cooled according to the amount of cooling water supplied to a heat exchanger is shown. FIG. 5 is an operation mode graph showing the correspondence between the cooling water temperature TE2 and the load heat amount, and the operation mode. It is a graph which shows the correspondence of the load factor of the refrigerator (INV turbo refrigerator, constant speed turbo refrigerator) based on the refrigerator power consumption calculation formula memorize | stored in the database 16, and COP in the case of the load factor. . It is a graph which shows the response | compatibility with the load factor (substantially load calorie | heat amount), power consumption, and each of COP in the operation mode M1. It is the graph which showed the response | compatibility with the load factor of the load in the operation mode M1, and system COP for every temperature. It is a graph which shows COP of the whole heat source system by the operation mode M1, the operation mode M2, and the operation mode M3 corresponding to the load factor of load calorie | heat amount.

The heat source operation navigation system of the present invention is an operation navigation system that generates an operation pattern of the heat source system. FIG. 1 shows a heat source system that is a target for generating an operation pattern (an operation mode to be described later and an operation condition of the apparatus in each operation mode) by the heat source operation navigation system according to the present embodiment.
In FIG. 1, the heat source system 100 supplies cold water for cooling to a load 200.
The heat source system 100 in FIG. 1 includes a cooling tower 101, a heat exchanger 102, and a refrigerator 103_1 to a refrigerator 103_n (n is an integer, and will be described as n = 3 in the present embodiment), a cold water primary pump 104_1. To cold water primary pump 104_n, cooling water primary pump 105_1 to cooling water primary pump 105_n, heat exchanger primary pump 106, heat exchanger secondary pump 107, cold water (outward) header 108, cold water (return) header 109, cooling A water (outward) header 110 and a cooling water (return) header 111 are provided.

Each of the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3 is cooled by the chilled water primary pump 104_1, the chilled water primary pump 104_2, and the chilled water primary pump 104_3 via the chilled water (outward) header 108, respectively. Is sent to the load 200.
In addition, cold water recirculated from the load 200 flows from the cold water (return) header 109 into each of the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3.
The heat exchanger 102 performs heat exchange between the cold water supplied from the cold water (return) header 109 by the heat exchanger secondary pump 107 and the cooling water supplied from the cooling water (return) header 111 by the heat exchanger primary pump 106. Do.
The cooling tower 101 cools the cooling water supplied from the cooling water (return) header 111 and sends it to the cooling water (outward) header 110.

The amount of cold water that is the amount of cold water supplied to the load is controlled by the delivery amount of the cold water primary pump 104_1, the cold water primary pump 104_2, and the cold water primary pump 104_3.
The amount of cooling water, which is the amount of cooling water, is sent to the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3 by the cooling water primary pump 105_1, the cooling water primary pump 105_2, and the cooling water primary pump 105_3, respectively. This is the sum of the amount of cooling water and the amount of cooling water sent from the heat exchanger primary pump 106 to the heat exchanger 102.

In the present embodiment, the following three operation modes are used as the operation mode of the heat source system of FIG.
Fig.1 (a) has shown operation | movement of the heat-source system 100 in the operation mode M1 which is refrigerator independent operation mode. This operation mode M1 is an operation mode of only the refrigerator, and is an operation mode based on an efficient operation number utilizing the high efficiency in the partial load operation which is a characteristic of the INV (inverter) turbo refrigerator. That is, in FIG. 1A, heat exchange between cooling water and cold water in the heat exchanger 102 is not performed. For this reason, the heat exchanger primary pump 106 and the heat exchanger secondary pump 107 are not operating. The operation (operation) of the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3 is performed so that the COP (Coefficient of Performance: coefficient of performance) becomes the lowest value when the cooling water is set to cool the load. ) The number, the load factor of the operating refrigerator, the amount of cooling water, and the set temperature of the cooling water set to cool the load are controlled.

  The power consumption amount of the heat source system 100 in this operation mode M1 is not only the power consumption amount corresponding to the load factor in the operating refrigerator, but also other power consumption amounts shown below are added. That is, the other power consumption amounts are the power consumption used in the cooling tower 101 in order to set the temperature at which the cooling water is supplied to the refrigerator, and every refrigerator supplied from the cooling tower 101 to the refrigerator operating the cooling water. The cooling water primary pumps (cooling water primary pump 105_1, cooling water primary pump 105_2, and cooling water primary pump 105_3) installed in the chiller are installed for each refrigerator that sends cold water to the load. Power consumption of the chilled water primary pumps (the chilled water primary pump 104_1, the chilled water primary pump 104_2, and the chilled water primary pump 104_3).

  FIG. 1B shows the operation of the heat source system 100 in the operation mode M2, which is an operation mode in which the refrigerator and the heat exchanger cooperate in FC (free cooling) operation. The operation mode M2 in FIG. 1 (b) is a precool operation mode in which the temperature of the cold water returning to the refrigerator is lowered by the heat exchanger and returned to the refrigerator, and the refrigerator is cooled from the temperature lowered by the heat exchanger. This is an operation mode in which the temperature of the cold water is lowered to a predetermined temperature. That is, in FIG. 1B, not only the refrigerators (the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3) but also the heat exchange between the cooling water and the cold water in the heat exchanger 102 is performed. For this reason, unlike FIG. 1A, the heat exchanger primary pump 106 and the heat exchanger secondary pump 107 are operating. In this operation mode M2, the heat exchanger 102 lowers the temperature of the chilled water with the cooling water, subtracts the production heat amount produced by the heat exchanger 102 from the load heat amount, and applies a load to the differential heat amount obtained by the subtraction result. The number of operating (operating) units in the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3 and the operating refrigeration so that the COP becomes the minimum value so that the cooling water is set to cool. The load factor of the machine and the amount of cooling water are controlled.

Here, the heat exchanger primary pump 107 allows cold water returning from the load from the cold water (return) header 109 to flow into the heat exchanger 102. Then, the cold water cooled by heat exchange with the cooling water in the heat exchanger 102 is returned to the cold water (return) header 109 again.
The power consumption amount of the heat source system 100 in this operation mode M2 is not only the power consumption amount corresponding to the load factor in the operating refrigerator and the power consumption amount of the operating heat exchanger, but also other consumptions shown below. The amount of power is added. That is, the other power consumption amounts are the power consumption used in the cooling tower 101 in order to set the temperature at which the cooling water is supplied to the refrigerator, and every refrigerator supplied from the cooling tower 101 to the refrigerator operating the cooling water. Power consumption of the cooling water primary pump installed in the cooling water, power consumption of the cold water primary pump installed in each refrigerator that sends cold water to the load, and cooling from the cooling tower 101 to the heat exchanger 102 They are the power consumption of the heat exchanger primary pump 106 that allows water to flow in and the power consumption of the heat exchanger secondary pump 107 that sends cold water to the cold water (return) header 109 via the heat exchanger 102.

  FIG.1 (c) has shown operation | movement of the heat-source system 100 in the operation mode M3 which is an operation mode in which the refrigerator and heat exchanger in FC operation cooperate. This operation mode M3 is a complete free cooling operation mode, and the temperature of the chilled water is supplied to the load by heat exchange between the chilled water and the chilled water using the heat exchanger without using the refrigerator. This is an operation mode in which the temperature is lowered to a predetermined temperature. That is, in FIG. 1C, none of the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3) operates, and only heat exchange between the cooling water and the cold water in the heat exchanger 102 is performed. For this reason, unlike FIG.1 (b), the cold water primary pump (The cold water primary pump 104_1, the cold water primary pump 104_2, and the cold water primary pump 104_3) is not operating. In this operation mode M3, the amount of cooling water supplied to the heat exchanger 102 and the amount of cold water flowing into the heat exchanger 102 so that the heat exchanger 102 lowers the temperature of the cold water to the temperature supplied to the load 200 by the cooling water. Is controlled.

Here, the heat exchanger primary pump 107 allows cold water returning from the load from the cold water (return) header 109 to flow into the heat exchanger 102. Then, the cold water cooled by heat exchange with the cooling water in the heat exchanger 102 is returned to the cold water (outward) header 108.
The power consumption amount of the heat source system 100 in this operation mode M3 is not only the power consumption amount corresponding to the heat exchange between the cooling water and the cold water in the operating heat exchanger 102 but also the other power consumption amounts shown below. Is done. That is, the other power consumption is the power consumption of the heat exchanger primary pump 106 that supplies cooling water from the cooling tower 101 to the heat exchanger 102, and the heat that is sent to the load 200 via the heat exchanger 102. This is the power consumption of the exchange secondary pump 107.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing a configuration example of the heat source operation navigation system 1 according to the embodiment of the present invention. In FIG. 2, the heat source operation navigation system 1 includes a heat exchanger efficiency calculation unit 11, a refrigerator efficiency calculation unit 12, an overall efficiency calculation unit 13, a free cooling determination unit 14, a heat source operation control unit 15, a database 16, and an operation mode database 17. It has.

  The heat source operation navigation system 1 determines the load heat amount, which is the load supplied to the load by the refrigerator in the heat source system, by the magnitude of the load heat amount at that time and the outside air temperature (cooling water temperature TE2 supplied from the cooling tower), etc. It is determined whether or not to use free cooling by the heat exchanger, that is, whether the operation mode is M1, or whether the operation mode is M2 or M3. The heat source operation navigation system 1 optimizes the number of refrigerators to be operated and the load factor of the refrigerators to be operated when it is determined that the operation mode M1 and the operation mode M2.

  The database 16 is obtained from actual measurements to calculate the production heat amount and power consumption of the refrigerator corresponding to the conditions of the cooling water temperature TE2, the cooling water amount and the load factor for each of the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3. A refrigerator power consumption calculation formula, which is an experimental formula, is written and stored in advance. Here, COP is obtained by dividing the amount of production heat by the amount of power consumption.

  Further, the database 16 includes an empirical formula obtained from actual measurements for calculating the heat consumption and power consumption of the heat exchanger 102 corresponding to the cooling water temperature, the cooling water amount, and the cooling water amount conditions of the heat exchanger 102. An electric energy calculation formula is written and stored in advance.

  Further, the database 16 includes the power consumption of each pump corresponding to the amount of chilled water in each condition of the chilled water primary pump 104_1, the chilled water primary pump 104_2, the chilled water primary pump 104_3, and the heat exchanger secondary pump 107. A cold water pump power consumption calculation formula that is an empirical formula calculated from actual measurement is written and stored in advance for each pump.

  Further, the database 16 includes consumptions of the respective pumps corresponding to the cooling water amount conditions of the cooling water primary pump 105_1, the cooling water primary pump 105_2, the cooling water primary pump 105_3, and the heat exchanger primary pump 106. A cooling water pump power consumption calculation formula, which is an empirical formula obtained from actual measurement for calculating the power consumption, is written and stored in advance for each pump.

  In addition, a cooling tower power consumption calculation formula, which is an empirical formula obtained from an actual measurement, for calculating power consumption corresponding to the conditions of the ambient temperature, ambient humidity, and cooling water amount of the cooling tower 101 is written in the database 16 in advance. Is remembered.

  In addition, the refrigeration machine power consumption calculation table, the exchange power consumption calculation table, and the chilled water pump power consumption calculation table in which numerical values calculated in advance are written corresponding to the respective conditions instead of the empirical formulas described above. The cooling water pump power consumption calculation table and the cooling tower power consumption calculation table may be written and stored in the database 16 in advance.

In the operation mode M3, the heat exchanger efficiency calculation unit 11 obtains the cooling water amount when calculating the production heat amount corresponding to the cooling water temperature TE2.
Moreover, the heat exchanger efficiency calculation part 11 calculates | requires the amount of production heat, and the amount of power consumption corresponding to this amount of production heat | fever with the amount of cooling water, and temperature TE2 of this cooling water with an exchange power consumption amount calculation formula.
Moreover, the heat exchanger efficiency calculation part 11 calculates | requires the amount of cooling water for manufacturing with the lowest system COP the manufacturing calorie | heat amount corresponding to the load calorie | heat amount supplied to the load 200 in the operation mode M3. Here, the system COP refers not only to the power consumption of the heat exchanger 102 but also to the heat exchanger secondary pump 107 that causes the cold water to flow into the heat exchanger 102 from the cold water (return) header 109 and the heat exchanger 102. It is a numerical value calculated by adding the power consumption of each of the heat exchanger primary pump 106 and the cooling tower 101 into which the cooling water is introduced to the power consumption of the heat exchanger 102. The heat exchanger efficiency calculation unit 11 obtains a cooling water amount for producing a production heat amount corresponding to the load heat amount, and obtains a power consumption amount of the cooling tower 101 corresponding to the cooling water amount from a cooling tower power consumption calculation formula.

In the operation mode M1, the refrigerator efficiency calculation unit 12 is manufactured for each of the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3 based on the cooling water temperature TE2 and the cooling water amount by the corresponding refrigerator power consumption calculation formula. The amount of heat to be produced and the amount of power consumed to produce this amount of heat for production are calculated and determined.
The refrigerator efficiency calculation unit 12 also operates the number of refrigerators to be operated and the load of the refrigerator to be operated for producing the production heat quantity corresponding to the load heat quantity supplied to the load 200 with the lowest system COP in the operation mode M1. The rate and the amount of cooling water supplied to the operating refrigerator are obtained. Here, the system COP is operating not only with the power consumption of the operating refrigerator, but also with the cold water primary pump that sends cold water from the operating refrigerator to the cold water (outward) header 108. It is a numerical value calculated by adding the power consumption amount of each of the cooling water primary pump that causes cooling water to flow into the refrigerator and the cooling tower 101 to the power consumption amount of the refrigerator.

At this time, the refrigerator efficiency calculation unit 12 operates the number and operation of refrigerators with the minimum system COP when manufacturing the same amount of production heat as the load heat 200 supplied to the load 200 corresponding to the cooling water temperature TE2. Each of the load factor and the cooling water amount of the refrigerator that has been made is determined.
Here, the refrigerator efficiency calculation unit 12 changes the number of refrigerators to be operated, the load factor of the refrigerators that have been operated, and the amount of cooling water while changing the amount of cooling water corresponding to the temperature TE2 of the cooling water. , Add the power consumption calculated by each of the cold water pump power consumption calculation formula, cooling water pump power consumption calculation formula, and cooling tower power consumption calculation formula, and use this total power consumption for the total heat source system Calculated as the amount of power consumption, divide the amount of production heat produced by the operating chiller by this total power consumption, the number of operating chillers with the smallest system COP, the load factor of the operated chillers, and the amount of cooling water Find a combination of

In the operation mode M2, the total efficiency calculating unit 13 corresponds to the temperature TE2 of the cooling water, and the number of operating refrigerators for obtaining the production heat amount equivalent to the load heat amount supplied to the load 200, the load of the operated heat exchanger Rate, the amount of cooling water supplied to the refrigerator, and the amount of cooling water supplied to the heat exchanger.
In addition, the total efficiency calculation unit 13 obtains the amount of power consumption corresponding to the amount of cooling water, the temperature TE2 of this cooling water, and the amount of production heat using an exchange power consumption calculation formula.
Here, the total efficiency calculation unit 13 subtracts the production heat quantity produced by the heat exchanger 102 from the load heat quantity, and calculates the differential heat quantity.
The total efficiency calculation unit 13 calculates the difference heat amount and the difference between the cooling water temperature TE2 and the cooling water amount for each of the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3 based on the corresponding refrigerator power consumption calculation formula. The amount of power consumption for producing the amount of heat is calculated and obtained.

  In the operation mode M1, the total efficiency calculation unit 13 uses the lowest system COP to produce the amount of heat corresponding to the amount of heat to be supplied to the load 200, and the amount of cooling water supplied to the heat exchanger 102 and the number of operating refrigerators. The load factor of the refrigerator to be operated and the amount of cooling water supplied to the operating refrigerator are obtained. Here, the system COP is not the sum of the power consumption of the heat exchanger and the operating refrigerator, but the heat exchanger primary pump 106 that causes the cooling water to flow into the heat exchanger 102 and the cold water that flows into the heat exchanger 102. (Return) Heat exchanger secondary pump 107 that flows in from header 109, cold water primary pump that sends cold water from the operating refrigerator to cold water (outward) header 108, and cooling water to the operating refrigerator It is a numerical value obtained by adding the power consumption amounts of the cooling water primary pump to be introduced and the cooling tower 101 to the power consumption amounts of the heat exchanger and the operating refrigerator.

At this time, the refrigerator efficiency calculation unit 12 generates the amount of cooling water to be supplied to the heat exchanger 102 that minimizes the system COP, the number of operating refrigerators, Obtain each of the load factor and the amount of cooling water.
Here, the refrigerator efficiency calculation unit 12 changes the amount of cooling water to be supplied to the heat exchanger 102, the number of operating refrigerators, the load factor of the operated refrigerator, and the amount of cooling water so as to correspond to the temperature TE2 of the cooling water. The power consumption calculated by each of the exchange power consumption calculation formula, the chilled water pump power consumption calculation formula, the cooling water pump power consumption calculation formula, and the cooling tower power consumption calculation formula is added and added. Obtain the power consumption as the total power consumption of the heat source system, divide the heat produced by the heat exchanger 102 and the refrigerator operating by the total power consumption, and supply to the heat exchanger 102 that minimizes the system COP The combination of the amount of cooling water to be operated, the number of operating refrigerators, the load factor of the operated refrigerators, and the amount of cooling water supplied to the operated refrigerators is obtained.

FIG. 3 is a flowchart showing an operation example for determining the operation mode of the heat source system and obtaining the optimum operating condition in the operation mode by the heat source operation navigation system 1 according to the embodiment of the present invention. The heat source operation navigation system 1 executes the flowchart of FIG. 3 for each combination of the temperature TE2 of the cooling water and the load heat amount. Here, the load heat amount is a preset temperature TE0 of cold water supplied to the load 200 via the cold water (outward) header 108, and a temperature TE1 of cold water returned to the cold water (return) header 109 by the load 200. The amount of heat of the difference (determined by the amount of cold water).
Hereinafter, the process for obtaining the optimum operation mode of the heat source operation navigation system 1 according to the present embodiment will be described with reference to FIGS. 1, 2, and 3.

Step S1:
The heat source operation control unit 15 includes a load heat amount (for example, unit RT) to be supplied to the load 200, a temperature TE1 of cold water returning to the refrigerator group (103_1 to 103_3), a temperature TE2 of cooling water supplied from the cooling tower 101, heat Data on the production performance of the production heat quantity of the exchange 102 is read.
And the heat source operation control part 15 outputs the control signal which instruct | indicates the mode determination process which optimizes the operation mode and operation conditions of the heat source system of FIG.

When the control signal is supplied from the heat source operation control unit 15, the free cooling determination unit 14 sends a control signal for requesting the calculation of the production heat quantity (for example, unit RT) of the heat exchanger obtained from the temperature TE <b> 2 to the heat exchanger. This is performed for the efficiency calculation unit 11.
The heat exchanger efficiency calculation unit 11 reads from the heat source operation control unit 15 the amount of cooling water that is the amount of cooling water, the temperature TE1 of cold water returning from the load, and the temperature TE2 of cooling water supplied from the cooling tower.

Step S2:
And the heat exchanger efficiency calculation part 11 calculates the amount of manufacture heat by a heat exchanger by the amount of cooling water which is the quantity of cooling water, temperature TE1, and temperature TE2. At this time, the cooling water amount is the same as the cooling water amount for each cooling water amount (for example, 100%, 75%, 50%, etc.) that is a ratio to the maximum cooling water amount that can be flowed in the heat source system 1 to be evaluated. The amount of production heat for the water temperature TE2 and the amount of power consumption corresponding to this amount of production heat are obtained from the exchange power consumption calculation formula read from the database 16.

Also, instead of using the formula for calculating the power consumption of the exchanger, for example, an actual measurement is performed in increments of 10% from 100% to 50%, and an experiment corresponding to the heat exchanger 102 is performed to correspond to the cooling water amount and the cooling water temperature TE2. The production heat quantity and the exchange power consumption calculation table for obtaining the production heat quantity may be stored in advance in the database 16.
The load heat amount mentioned above is a ratio with respect to the amount of cold water sent in the heat source system of evaluation object. The amount of cold water is a substantial amount of heat of load, and is calculated from the difference between the temperature TE1 and the supply temperature of the cold water sent to the load and this amount of cold water.

  FIG. 4 shows the cooling water temperature at which free cooling can be performed according to the amount of cooling water supplied to the heat exchanger. In FIG. 4, as described above, the production heat quantity of the heat exchanger 102 is calculated for other cooling water quantities. In FIG. 4, the left vertical axis indicates the production heat quantity (RT), the right vertical axis indicates the temperature, and the horizontal axis indicates the ratio of the amount of cold water supplied by the heat exchanger secondary pump. In FIG. 4, the solid line indicates the temperature TE2 of the cooling water flowing into the heat exchanger, and the broken line indicates the amount of production heat produced by the heat exchanger 102 by heat exchange between the cooling water and the cold water. Here, the amount of cooling water is determined as 100% of the supplyable amount.

For example, when the amount of load heat supplied to the load is 2000 RT, if the amount of cold water is 100% of the supplyable amount, the temperature of the cooling water is 12 ° C., and the heat exchanger can produce 2000 RT of production heat. Without using a machine, it is possible to completely exchange the cold water with the cooling water only to a predetermined temperature supplied to the load.
In addition, when the amount of heat supplied to the load is 1000 RT, if the flow rate of the cold water is 50% of the supplyable amount, the temperature of the cooling water is 13.5 ° C., and the heat exchanger can produce 1000 RT.

In the case of the operation mode M3, as described above, the heat produced by the heat exchanger is larger than the amount of heat to be supplied to the load, and the amount of heat produced and the amount of power consumed for producing this amount of heat produced. Is calculated by the heat exchanger efficiency calculation unit 11 using the exchanger power consumption calculation formula based on the temperature TE2 of the cooling water, the amount of cooling water supplied to the heat exchanger 102, and the amount of cold water supplied to the heat exchanger. In addition, the heat exchanger efficiency calculation unit 11 uses the calculated production heat amount for the power consumption of the heat exchanger primary pump 106 that supplies cooling water to the heat exchanger 102 and the heat exchanger secondary pump that supplies cold water to the heat exchanger 102. The system COP is calculated by dividing the total power consumption amount obtained by adding the power consumption amount 107 and the power consumption amount of the cooling tower 101 corresponding to the cooling water amount.
At this time, the heat exchanger efficiency calculation unit 11 calculates the power consumption of the heat exchanger secondary pump 107 by calculating the power consumption of the heat exchanger primary pump 106 in accordance with the cooling water pump power consumption calculation formula in association with the amount of cooling water. Is calculated by the cold water pump power consumption calculation formula corresponding to the amount of cold water, and the power consumption amount of the cooling tower 101 is calculated by the cooling tower power consumption calculation formula corresponding to the cooling water amount, ambient temperature, and ambient humidity. .

Step S3:
Next, the free cooling determination unit 14 supplies the production heat amount in FIG. 4 obtained for each cooling water amount by the heat exchanger efficiency calculation unit 11 corresponding to the cold water amount (that is, the load heat amount of the load 200) and the load 200. Comparison with the amount of load heat to be performed.
Thereby, the free cooling determination part 14 determines with the operation mode M3 being able to be performed, when there exists the cooling water amount whose manufacturing calorie is more than load calorie | heat amount, and advances a process to step S4.
On the other hand, even when the cooling water flows at 100%, the free cooling determination unit 14 cannot perform the operation mode M3 when the production heat quantity is less than the load heat quantity, and is in either the operation mode M1 or the operation mode M2. And the process proceeds to step S5.

Step S4:
In response to the determination that the free cooling determination unit 14 can perform the operation mode M3, the heat source operation control unit 15 selects the smallest cooling water amount from the cooling water amount of the production heat amount exceeding the load heat amount, and this cooling water amount The system COP at is calculated.
That is, the heat source operation control unit 15 divides the production heat amount by the total power consumption amount obtained by adding the power consumption amount of the heat exchanger 102 and the power consumption amounts of the heat exchanger primary pump 106 and the heat exchanger secondary pump 107. Thus, the system COP under this condition is calculated.
Then, the heat source operation control unit 15 associates the cooling water temperature TE2 and the load heat amount with the cooling water amount, the COP, and the operation mode under these conditions, and the operation mode data is stored in an operation mode table (described later) of the operation mode database 17. On the other hand, it is written and stored, and the process is terminated.

  For example, the operation mode database 17 stores the operation mode graph of FIG. 5 showing the correspondence between the cooling water temperature TE2 and the load heat amount and the operation mode. FIG. 5 is an operation mode graph showing the correspondence between the cooling water temperature TE2 and the load heat amount, and the operation mode. In FIG. 5, the vertical axis indicates the temperature TE2 of the cooling water, and the horizontal axis indicates the amount of load heat supplied to the load. For example, if the cooling water temperature is 19 ° C. and the load heat quantity is 3500 RT, the operation conditions such as the operation mode M2, the number of refrigerators, two heat exchangers, the load factor of the refrigerator, the amount of cooling water, etc. Data can be obtained.

Step S5:
The heat source operation control unit 15 receives the fact that the free cooling determination unit 14 has determined that the operation mode M3 cannot be performed, and thus the operation condition including the cooling water amount, the number of operating refrigerators, and the load factor of the operating refrigerator Is supplied to the refrigerator efficiency calculation unit 12 with a numerical value that is different for each repetition within a predetermined range set in advance, and the process proceeds to step S6.

Step S6:
The refrigerator efficiency calculation unit 12 calculates the system COP, which is the COP of the entire heat source system, when operating in the refrigerator independent operation, and the refrigeration corresponding to the coolant temperature TE2, the amount of coolant, and the load factor of the refrigerator The refrigerator COP calculation formula is read from the database 16 and used.

FIG. 6 shows the correspondence between the load factor of the refrigerator (INV turbo refrigerator, constant speed turbo refrigerator) based on the refrigerator power consumption calculation formula stored in the database 16 and the COP in the case of the load factor. It is a graph to show.
FIG. 6A shows the load factor of the refrigerator and the COP of the refrigerator at the load factor when the temperature TE2 of the cooling water supplied to each of the refrigerators is 32 ° C.
FIG. 6B shows the load factor of the refrigerator and the COP of the refrigerator at the load factor when the temperature TE2 of the cooling water supplied to each of the refrigerators is 28 ° C.
FIG. 6C shows the load factor of the refrigerator and the COP of the refrigerator at the load factor when the temperature TE2 of the cooling water supplied to each of the refrigerators is 24 ° C.
FIG. 6D shows the load factor of the refrigerator and the COP of the refrigerator at the load factor when the temperature TE2 of the cooling water supplied to each of the refrigerators is 20 ° C.

6 (a) to 6 (d), the horizontal axis represents the load factor output from the heat exchanger, and the vertical axis represents the COP of the refrigerator.
In FIGS. 6A to 6D, the solid line (◇) indicates the correspondence between the load factor of the INV turbo chiller and the COP, and the broken line (□) indicates the load factor of the constant speed turbo chiller. The correspondence between COP and COP is shown. In the present embodiment, description is made on the assumption that an INV turbo refrigerator is used as a refrigerator. The characteristic data of the INV turbo chiller in FIG. 6 is collected in advance, for example, and written and stored in the database 16 in advance as a refrigerator efficiency table. Although not described here, the characteristic data of FIG. 6 exists for each cooling water amount.

  Returning to FIG. 2, the refrigerator efficiency calculation unit 12 adds the COP of the refrigerator for every load factor of the refrigerator to be operated in all of the refrigerators to be operated, and is the most system at the given cooling water temperature TE2. The number of refrigerators to be operated with a reduced COP, the load factor of the refrigerator to be operated, and the amount of cooling water supplied to the refrigerator to be operated are obtained. Thereby, the refrigerator efficiency calculation part 12 calculates | requires the system COP in the operation mode M2 which is the refrigerator independent operation | movement for every load factor of a refrigerator corresponding to the combination of the temperature TE2 of cooling water, and load calorie | heat amount.

  Here, when calculating the system COP, in the formula for calculating the COP (production heat amount / power consumption amount), cold water is supplied to the load for the power consumption of the denominator dividing the heat amount produced by the numerator refrigerator. The amount of power consumed by the cold water primary pump and the cooling water primary pump that supplies the cooling water to the refrigerator is also added. In addition, the amount of power consumed by the cooling water primary pump changes depending on the amount of cooling water sent from the cooling water primary pump to the refrigerator, and similarly, the amount of cooling water sent from the cooling water primary pump to the load changes. The power consumption in the cold water primary pump changes. This change amount is also reflected in the calculation of the system COP.

FIG. 7 is a graph showing the correspondence between the load factor (substantially load heat amount), power consumption, and COP in the operation mode M1.
In each of FIGS. 7A to 7E, the left vertical axis indicates the power consumption, the right vertical axis is the COP, and the horizontal axis indicates the load factor of the load. In FIG. 7, the bar graph indicates the power consumption for each load factor of the load, the thick line (□) indicates the COP of the refrigerator alone, and the thin line (◇) indicates the system COP that is the COP of the entire heat source system. Yes. The bar graph shows the total power consumption that is the sum of the power consumption of each of the cooling tower 101, the refrigerator, the cold water primary pump, and the cooling water primary pump in the heat source system. Each component in the bar graph indicates the power consumption of each of the INV turbo chiller (refrigerator), the cold water primary pump, the cooling water primary pump, and the cooling tower 101 in order from the lower component.

  Here, the power consumption amount of the refrigerator is a value obtained by summing the power consumption amounts corresponding to the load factor of the number of operating refrigerators among the refrigerator 103_1, the refrigerator 103_2, and the refrigerator 103_3. The power consumption of the chilled water primary pump corresponds to the amount of chilled water of the chilled water primary pump 104_1, the chilled water primary pump 104_2, and the chilled water primary pump 104_3 connected to the operating refrigerator. This is the total value of power consumption. Similarly, the power consumption of the cooling water primary pump is the cooling water 1 connected to the operating refrigerator among the cooling water primary pump 105_1, the cooling water primary pump 105_2, and the cooling water primary pump 105_3. This is the total value of power consumption corresponding to the cooling water amount of the next pump. The system COP is a numerical value obtained by dividing the production heat produced by the refrigerator by the total power consumption of the bar graph.

FIG. 7A is a graph showing the correspondence between the load factor of the load, the power consumption, and each of the COPs when the cooling water temperature TE2 is 32 ° C. FIG.
FIG. 7B is a graph showing the correspondence between the load factor of the load, the amount of power consumption, and each of the COPs when the cooling water temperature TE2 is 28 ° C.
FIG.7 (c) is a graph which shows a response | compatibility with each of the load factor of a load, power consumption, and COP in case the temperature TE2 of cooling water is 24 degreeC.
FIG. 7D is a graph showing the correspondence between the load factor of the load, the power consumption, and each of the COPs when the cooling water temperature TE2 is 20 ° C.
FIG. 7E is a graph showing the correspondence between the load factor of the load, the amount of power consumption, and each of the COPs when the temperature TE2 of the cooling water is 17 ° C.
It can be seen that the higher the temperature of the cooling water, the lower the COP for producing the production heat quantity of the refrigerator.
The refrigerator efficiency calculation unit 12 obtains a system COP corresponding to the cooling water temperature TE2 and the load factor of the load.

  FIG. 8 is a graph showing the correspondence between the load factor of the load in the operation mode M1 and the system COP for each temperature. In each of FIG. 8A to FIG. 8F, the vertical axis indicates COP and the horizontal axis indicates the load factor of the load. In each of FIGS. 8A to 8F, “□” indicates the COP at the cooling water temperature TE = 17 ° C., and “◇” indicates the COP at the cooling water temperature TE = 20 ° C. , “△” indicates the COP at the cooling water temperature TE = 24 ° C., “◯” indicates the COP at the cooling water temperature TE = 28 ° C., and “×” indicates the COP at the cooling water temperature TE2 = 32 ° C. Show. FIG. 8 collectively shows the correspondence relationship between the temperature TE2 of the cooling water obtained in FIG. 7 and the load factor of the load by the amount of cooling water.

FIG. 8A is a graph showing the correspondence between the load factor of the load and the system COP when the ratio of the cooling water amount to the maximum cooling water amount that can be flowed by the heat source system of FIG. 1 is 100%.
FIG. 8B is a graph showing the correspondence between the load factor of the load and the system COP when the ratio of the cooling water amount to the maximum cooling water amount that can be flowed by the heat source system of FIG. 1 is 90%.
FIG. 8C is a graph showing the correspondence between the load factor of the load and the system COP when the ratio of the cooling water amount to the maximum cooling water amount that can flow in the heat source system of FIG. 1 is 8%.
FIG. 8D is a graph showing the correspondence between the load factor of the load and the system COP when the ratio of the cooling water amount to the maximum cooling water amount that can flow in the heat source system of FIG. 1 is 70%.
FIG. 8E is a graph showing the correspondence between the load ratio of the load and the system COP when the ratio of the cooling water amount to the maximum cooling water amount that can be flowed by the heat source system of FIG. 1 is 60%.
FIG. 8F is a graph showing the correspondence between the load factor of the load and the system COP when the ratio of the cooling water amount to the maximum cooling water amount that can be flowed by the heat source system of FIG. 1 is 50%.

FIG. 9 is a graph showing the COP of the entire heat source system in the operation mode M1, the operation mode M2, and the operation mode M3 corresponding to the load factor of the load heat amount. Here, the line (solid line) for the refrigerator independent operation indicates the operation mode M1, and the line for the FC operation (broken line) indicates the operation mode M2 and the operation mode M3.
FIG. 9A shows the entire heat source system corresponding to the temperature TE2 of the cooling water in each of the refrigerator independent operation and the FC operation when the load factor of the supplied load is 100% of the maximum load heat amount to be supplied. The relationship between COP (Coefficient of Performance, heat production capacity (kW) / power consumption (kW) used to generate heat) is shown.
FIG. 9B shows the entire heat source system corresponding to the temperature TE2 of the cooling water in each of the refrigerator independent operation and the FC operation when the load factor of the supplied load is 80% of the maximum load heat amount to be supplied. The relationship with COP is shown.
FIG. 9C shows the entire heat source system corresponding to the temperature TE2 of the cooling water in each of the refrigerator independent operation and the FC operation when the load factor of the supplied load is 60% of the maximum load heat amount to be supplied. The relationship with COP is shown.
FIG. 9D shows the entire heat source system corresponding to the temperature TE2 of the cooling water in each of the refrigerator independent operation and the FC operation when the load factor of the supplied load is 40% of the maximum load heat amount to be supplied. The relationship with COP is shown.

9A to 9D, the horizontal axis represents the cooling water temperature TE2, and the vertical axis represents the system COP of the entire system.
Further, as shown in FIG. 9, according to the load factor of the load for supplying cold water (that is, the amount of load heat supplied to the load), the cooling water is supplied to the load in the case of FC operation and for each cooling water temperature. The system COP of the entire heat source system when the amount of heat is manufactured is calculated.
For example, in the case of the operation mode M1, the refrigerator efficiency calculation unit 12 obtains the number of refrigerators to be operated and the respective load factors when manufacturing the load heat amount for each load factor.

  For example, in FIG. 9A, the cooling water temperature of 22 ° C. is the boundary temperature between the FC operation and the refrigerator single operation. When the temperature TE2 of the cooling water is 22 ° C. or lower, the system COP in the FC operation (operation mode M2) is higher than the system COP in the refrigerator single operation (operation mode M2), so the FC operation is performed. On the other hand, when the temperature TE2 of the cooling water exceeds 22 ° C., the system COP in the freezer operation alone exceeds the system COP in the FC operation, and thus the freezer operation is performed.

Step S7:
The heat source operation control unit 15 sets the operating condition data including the cooling water amount, the number of operating refrigerators, and the load factor of the operating refrigerator in all combinations within a predetermined range (see FIG. 7 and FIG. 7). It is determined whether or not the combination for obtaining the data of FIG. 8 has been supplied.
At this time, if the heat source operation control unit 15 determines that data of operation conditions in a predetermined range set in advance is supplied in all combinations, the process proceeds to step S8.
On the other hand, if it determines with the heat source operation control part 15 not supplying the data of the operation condition in the predetermined range set beforehand by all the combinations, a process will be returned to step S5.

Step S8:
Next, the heat source operation control unit 15 assumes that the calculation of the COP of the production heat quantity in the refrigerator has been completed, and data on operating conditions including the cooling water amount, the number of operating refrigerators, and the load factor of the operating refrigerator. Is supplied to the total efficiency calculation unit 13 by a numerical value that is different for each repetition within a predetermined range set in advance, and the process proceeds to step S9.

Step S9:
In the case of FC (free cooling) operation, calculation differs between the operation mode M2 and the operation mode M3, but since the operation mode M3 has already been calculated, how to obtain the conditions in the operation mode M2 will be described below.
In the case of the operation mode M2, the total efficiency calculation unit 13 sets the temperature difference that is the difference between the temperature difference TE1 of the chilled water returning from the load and the temperature TE2 of the cooling water so that the temperature difference TE1_2 can exchange heat with the heat exchanger. When the load heat quantity supplied to the load is greater than the production heat quantity produced by the heat exchanger with the temperature difference TE1_2, the difference between the load heat quantity and the production heat quantity is produced by the refrigerator. It will be.
The total efficiency calculation unit 13 calculates the production heat quantity, calculates the power consumption amount for obtaining the production heat capacity of the heat exchanger in the same manner as the heat exchanger efficiency calculation unit 11, and calculates the load heat quantity and the production heat quantity produced by itself. Calculate the amount of heat difference.

Then, the total efficiency calculation unit 13 calculates the COP for each number of operating refrigerators and the load factor with respect to the calculated heat difference, similarly to the refrigerator efficiency calculating unit 12, and the smallest COP and the number of operating units in this case And determine the load factor. And the total efficiency calculation part 13 calculates | requires the total electric power consumption of the refrigerator, the chilled water primary pump, and the cooling water primary pump in this operation number and load factor.
Then, the total efficiency calculation unit 13 divides the load heat amount by the total power consumption obtained by adding the power consumption required to manufacture the manufacturing heat amount and the power consumption required to manufacture the differential heat amount, System COP is calculated.

Step S10:
Did the heat source operation control unit 15 supply all the combinations of the operating condition data including the cooling water amount, the number of operating refrigerators, and the load factor of the operating refrigerator in a predetermined range set in advance? Determine whether or not.
At this time, if it determines with the heat source operation control part 15 having supplied the data of the operation condition in the predetermined range set beforehand by all the combinations, a process will be advanced to step S11.
On the other hand, if it determines with the heat source operation control part 15 not supplying the data of the operation condition in the predetermined range set beforehand by all the combinations, a process will be returned to step S8.

Step S11:
The free cooling determination unit 14 compares the system COP (operation mode M1) obtained by the refrigerator efficiency calculation unit 12 with the system COP (operation mode M2) obtained by the total efficiency calculation unit 13 at the cooling water temperature TE2. . In the calculation result as shown in FIG. 9, it is determined whether to perform the FC operation or the refrigerator single operation.
That is, if the system COP (operation mode M1) exceeds the system COP (operation mode M2), the free cooling determination unit 14 determines to use the operation mode M1, and advances the process to step S12.
On the other hand, when the system COP (operation mode M1) is equal to or lower than the system COP (operation mode M2), the free cooling determination unit 14 determines to use the operation mode M2, and advances the process to step S13.

Step S12:
The heat source operation control unit 15 is operating along with the temperature TE2 of the cooling water and the amount of heat of the load, the type of operation mode (operation mode M1) under these conditions, the amount of cooling water to the refrigerator, the system COP, the number of operating refrigerators The operation mode data of the load factor of the refrigerator is written and stored in the operation mode table of the operation mode database 17, and the process is terminated.

Step S13:
The heat source operation control unit 15 sets the operation mode type (operation mode M2) under these conditions, the cooling water temperature TE2 and the load heat amount, the cooling water amount to the refrigerator, the cooling water amount to the heat exchanger, the system COP, and the operation of the refrigerator The operation mode data of the number of units and the load factor of the operating refrigerator is written and stored in the operation mode table of the operation mode database 17, and the process is terminated.

The heat source operation navigation system 1 according to the present embodiment performs the processing of the above-described flowchart for each combination of the cooling water temperature E2 and the load heat amount, and describes the obtained operation mode and the operation mode data at that time. Thus, the operation mode table shown in FIG. 5 for use in driving the heat source system of FIG. 1 can be easily generated.
In the heat source system shown in FIG. 1, a control unit (not shown) detects the temperature TE2 of the cooling water and the load heat amount in real time by a measuring device such as a sensor, and the operation mode data corresponding to the temperature TE2 and the load heat amount is By reading from the operation mode table of the operation mode database 17, the heat source system can be easily operated optimally.

In the present embodiment, a cold water primary pump that supplies cold water to the load, a cooling water primary pump that supplies cooling water to the refrigerator, a heat exchanger primary pump that supplies cold water to the heat exchanger, and cooling to the heat exchanger Because the operation mode is determined by the system COP including the power consumption of the equipment such as the secondary pump of the heat exchanger that supplies water, the free cooling process is performed with higher accuracy and higher speed than before. It can be determined from the viewpoint of energy saving.
Therefore, according to the embodiment of the present application, the operating conditions of the refrigerator and the heat exchanger can be set at a higher speed and with a higher accuracy in operation than in the conventional case.

In other words, when free cooling is performed, the lower the temperature TE2 of the cooling water (that is, the lower the ambient temperature of the cooling tower), the lower the temperature of the cooling water can be used. be able to. However, when the temperature TE2 of the cooling water is lowered, the COP of the refrigerator is improved. On the other hand, the power consumption of the heat exchanger primary pump 106 and the heat exchanger secondary pump 107 that operate along with the heat exchanger 102 when performing free cooling. It is necessary to consider the amount.
Even if free cooling is possible, the system COP is lower in the operation mode M1 in which the refrigerator is operated alone than in the operation mode M2 in which the power consumption of the heat exchanger primary pump 106 and the heat exchanger secondary pump 107 is required. There is a case. Since the present embodiment evaluates with the system COP in consideration of the total power consumption of the heat source system 100, it is possible to clearly determine which of the operation mode M1 and the operation mode M2 is used.

  Further, a program for realizing the function of the heat source operation navigation system 1 in FIG. 2 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into the computer system and executed, thereby executing the heat source. Processing for obtaining conditions for navigating efficient operation of the system may be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices.

Further, the “computer system” includes a homepage provision return boundary (or display return boundary) if the WWW system is used.
The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” dynamically holds a program for a short time like a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory in a computer system serving as a server or a client in that case, and a program that holds a program for a certain period of time are also included. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design and the like within a scope not departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Heat source operation navigation system 11 ... Heat exchanger efficiency calculation part 12 ... Refrigerator efficiency calculation part 13 ... Total efficiency calculation part 14 ... Free cooling determination part 15 ... Heat source operation control part 16 ... Database 17 ... Operation mode database 100 ... Heat source system DESCRIPTION OF SYMBOLS 101 ... Cooling tower 102 ... Heat exchanger 103_1, 103_2, 103_3 ... Refrigerator 104_1, 104_2, 104_3 ... Cold water primary pump 105_1, 105_2, 105_3 ... Cooling water primary pump 106 ... Heat exchanger primary pump 107 ... Heat exchanger secondary Pump 108 ... Cold water (outward) header 109 ... Cold water (return) header 110 ... Cooling water (outward) header 111 ... Cooling water (return) header

Claims (5)

A cooling tower that supplies cooling water at a first temperature, a plurality of refrigerators that cool the inflowing cooling water to a predetermined second temperature using the cooling water, and the cooling water is provided for each of the refrigerators. A cooling water pump supplied to the refrigerator, a cooling water pump that is provided for each refrigerator and supplies the cold water to a load, and heat exchange is performed between the incoming cold water and the cooling water, and the temperature of the cold water is set. A heat exchanger to be reduced, a heat exchanger primary pump provided in the heat exchanger and supplying the cooling water to the heat exchanger, and a heat exchanger provided in the heat exchanger and supplying the cold water to the heat exchanger In a heat source system comprising a heat exchanger secondary pump, a heat source operation navigation system that generates an operation pattern of the refrigerator and the heat exchanger,
A free cooling determination unit that determines whether to operate in one of the operation mode M1 by the refrigerator, the operation mode M2 by the combination of the refrigerator and the heat exchanger, or the operation mode M3 by the heat exchanger;
A refrigerator efficiency calculating unit that calculates a system COP that is an overall COP (coefficient of performance) of the heat source system in the operation mode M1 by the refrigerator;
A heat exchanger efficiency calculating unit for calculating the system COP in the operation mode M2 by the heat exchanger;
An overall efficiency calculation unit for calculating the system COP in the operation mode M3 by the refrigerator and the heat exchanger,
The operation mode M1, the operation mode M2, and the operation mode M3 determines whether the free cooling determination unit operates the heat source system in the operation mode M1, the operation mode M2, or the operation mode M3. The operation mode having the lowest COP is selected and the operation mode having the lowest COP is selected. The free cooling determination unit,
When the amount of production heat produced by the heat exchanger calculated by the heat exchanger efficiency calculation unit according to the first temperature of the cooling water is equal to or greater than the amount of load heat supplied to the load, the operation mode of the heat source system is set to 2. The heat source according to claim 1, wherein the operation mode of the heat source system is determined to be either the operation mode M <b> 1 or the operation mode M <b> 2 when the operation heat amount is less than the load heat amount. Driving navigation system. The free cooling determination unit,
The minimum system in the operation mode M1 calculated by adjusting the number of operating refrigerators and the load factor of the operated refrigerators according to the first temperature of the cooling water and the amount of cooling water. COP,
In accordance with the first temperature of the cooling water and the amount of cooling water, the total efficiency calculation unit calculates the production heat quantity produced by the heat exchanger and the heat exchanger power consumption when producing the production heat quantity, and the heat consumption from the load heat quantity The heat consumption of the heat exchanger and the power consumption of the refrigerator are obtained by calculating the power consumption of the refrigerator at the minimum COP, which is calculated by adjusting the number of operating refrigerators and the load factor of the operated refrigerator, by subtracting the production heat amount. 3. The heat source operation navigation system according to claim 2, wherein the operation mode M2 obtained by the above is compared with the minimum system COP in the operation mode M2, and the operation mode with the lower system COP is selected. When the heat exchanger efficiency calculation unit calculates the system COP in the operation mode M1, as the power consumption for manufacturing the production heat quantity, the power consumption of the heat exchanger and the consumption of the cooling tower corresponding to the cooling water quantity Power consumption, power consumption of the heat exchanger primary pump that causes the cooling water to flow into the heat exchanger from the cooling tower, and power consumption of the heat exchanger secondary pump that causes the cold water returning from the load to flow into the heat exchanger Using the total power consumption plus
When the refrigerator efficiency calculation unit calculates the system COP in the operation mode M3, as the power consumption for manufacturing the production heat quantity, the power consumption of the refrigerator that is operating and the cooling water amount Power consumption of the cooling tower, power consumption of the cooling water pump that causes the cooling water to flow into the refrigerator from the cooling tower, and supply of the cold water to the load from the refrigerator to cause the cooling water primary pump to Use the total power consumption plus the power consumption.
When the total efficiency calculating unit calculates the system COP in the operation mode M2, the power consumption of the heat exchanger, the power consumption of the cooling tower corresponding to the amount of cooling water, and the cooling tower to the heat exchanger Power consumption of the heat exchanger primary pump that allows cooling water to flow in, power consumption of the heat exchanger secondary pump that causes the cold water returning from the load to flow into the heat exchanger, and cooling from the cooling tower to the refrigerator The total power consumption obtained by adding the power consumption of the cooling water pump to which water flows in and the power consumption of the cold water primary pump by sending the cold water from the refrigerator to the load is used. The heat source operation navigation system according to any one of claims 1 to 3. A cooling tower that supplies cooling water at a first temperature, a plurality of refrigerators that cool the inflowing cooling water to a predetermined second temperature using the cooling water, and the cooling water is provided for each of the refrigerators. A cooling water pump supplied to the refrigerator, a cooling water pump that is provided for each refrigerator and supplies the cold water to a load, and heat exchange is performed between the incoming cold water and the cooling water, and the temperature of the cold water is set. A heat exchanger to be reduced, a heat exchanger primary pump provided in the heat exchanger and supplying the cooling water to the heat exchanger, and a heat exchanger provided in the heat exchanger and supplying the cold water to the heat exchanger In a heat source system comprising a heat exchanger secondary pump, a heat source operation navigation method for generating an operation pattern of the refrigerator and the heat exchanger,
A free cooling determination unit that determines whether the free cooling determination unit operates in one of the operation mode M1 by the refrigerator, the operation mode M2 by the combination of the refrigerator and the heat exchanger, or the operation mode M3 by the heat exchanger; ,
A refrigerator efficiency calculation unit that calculates a system COP that is an overall COP (coefficient of performance) of the heat source system in the operation mode M1 by the refrigerator;
A heat exchanger efficiency calculating section for calculating the system COP in the operation mode M2 by the heat exchanger;
A total efficiency calculating unit that calculates the system COP in the operation mode M3 by the refrigerator and the heat exchanger; and
The operation mode M1, the operation mode M2, and the operation mode M3 determines whether the free cooling determination unit operates the heat source system in the operation mode M1, the operation mode M2, or the operation mode M3. The operation mode having the lowest COP is selected and the operation mode having the lowest COP is selected.

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