Heat Source System

Abstract

Make the heat source system compact. [Solution] The heat source system 1 comprises a heat source unit 10 having a first heat circuit 30 through which a first heat medium circulates, an air-side heat exchanger 12 capable of a first type of heat exchange in which the first heat medium is cooled or heated by air, a heat source unit auxiliary unit (e.g., first heat source unit auxiliary unit 14) capable of a second type of heat exchange in which the first heat medium is cooled or heated by a second heat medium different from air, and a load-side heat exchanger (e.g., chilled water-side heat exchanger 66) capable of cooling or heating a third heat medium to be supplied to a heat load equipment (e.g., second heat load equipment 22) by the first heat medium.

Description

[Technical Field]

[0001] The present invention relates to a heat source system. [Background technology]

[0002] For example, Patent Document 1 discloses the combined operation of a water-cooled heat pump air conditioner and an air-cooled heat pump air conditioner. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-258407 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology of Patent Document 1 simply uses a water-cooled heat pump air conditioner and an air-cooled heat pump air conditioner together, which requires multiple heat source units, including a water-cooled heat pump air conditioner and an air-cooled heat pump air conditioner. As a result, the technology of Patent Document 1 requires a large space to install the multiple heat source units.

[0005] In view of the above problems, an object of the present invention is to provide a compact heat source system. [Means for solving the problem]

[0006] In order to solve the above problems, the heat source system of the present invention includes a heat source unit having a first thermal circuit in which a first heat medium circulates, an air-side heat exchanger capable of a first type of heat exchange in which the first heat medium is cooled or heated by air, a heat source unit auxiliary unit capable of a second type of heat exchange in which the first heat medium is cooled or heated by a second heat medium different from air, and a load-side heat exchanger capable of cooling or heating a third heat medium to be supplied to heat load equipment by the first heat medium. The air-side heat exchanger includes a first fan capable of transferring heat of the air to the first heat medium, the heat source machine auxiliary includes a heating tower capable of heating a second heat medium and a tower-side heat exchanger capable of heating the first heat medium with the fluid second heat medium, the heat source machine includes a compressor that compresses the first heat medium, and the first thermal circuit includes a branch node capable of supplying the first heat medium flowing out from the load-side heat exchanger to the air-side heat exchanger and the tower-side heat exchanger, and an inlet-side three-way valve capable of changing the ratio between the flow rate of the first heat medium drawn from the air-side heat exchanger into the compressor and the flow rate of the first heat medium drawn from the tower-side heat exchanger into the compressor.

[0011] In order to solve the above problems, the heat source system of the present invention includes a heat source machine having a first heat circuit in which a first heat medium circulates, an air-side heat exchanger capable of a first type of heat exchange in which the first heat medium is cooled or heated by air, a heat source machine auxiliary device capable of a second type of heat exchange in which the first heat medium is cooled or heated by a second heat medium different from air, and a load-side heat exchanger capable of cooling or heating a third heat medium to be supplied to heat load equipment by the first heat medium; A terminal control device that is provided near the heat source machine and is capable of controlling at least the heat source machine, and a central control device that is capable of remotely controlling the terminal control device, Preparation a ratio of the first type of heat exchange to the combined heat exchange of the first type of heat exchange and the second type of heat exchange is a first heat exchange ratio, and a ratio of the second type of heat exchange to the combined heat exchange of the first type of heat exchange and the second type of heat exchange is a second heat exchange ratio; the central control device creates a heat exchange ratio map including at least one of the first heat exchange ratio for each load factor of the heat source machine and the second heat exchange ratio for each load factor of the heat source machine, and transmits the heat exchange ratio map to the terminal control device; the terminal control device derives the current load factor of the heat source machine and determines at least one of the first heat exchange ratio and the second heat exchange ratio corresponding to the current load factor of the heat source machine based on the heat exchange ratio map, and controls the heat source machine, the air-side heat exchanger, and the heat source machine auxiliary equipment based on the determined first heat exchange ratio and second heat exchange ratio. do.

[0012] The central control device also derives, for each first heat exchange ratio, a first cost required to operate the air-side heat exchanger at a first heat exchange ratio at a predetermined load factor in the heat source machine, derives, for each second heat exchange ratio, a second cost required to operate the heat source machine auxiliary at a second heat exchange ratio at the predetermined load factor, derives, for each second heat exchange ratio, a total cost obtained by adding up the first cost and the second cost at the predetermined load factor, and determines, for each first heat exchange ratio and second heat exchange ratio, the first heat exchange ratio that minimizes the total cost at the predetermined load factor and the second heat exchange ratio that minimizes the total cost. A heat exchange ratio map may be created by at least one of: deriving at least one of the first heat exchange ratio that results in the smallest total cost and the second heat exchange ratio that results in the smallest total cost for each load rate of the heat source machine; and deriving at least one of the first heat exchange ratio that results in the smallest total cost and the second heat exchange ratio that results in the smallest total cost for each load rate of the heat source machine; and associating the load rate of the heat source machine with the first heat exchange ratio that results in the smallest total cost for each load rate of the heat source machine.

[0013] In addition, the air-side heat exchanger may include a first fan capable of air-cooling the first heat medium or transferring heat from the air to the first heat medium, and the first cost may include a cost corresponding to the power consumption of the first fan.

[0014] Furthermore, the heat source auxiliary equipment may include a cooling tower capable of cooling the second heat medium, and the second cost may include a cost corresponding to the power consumption of the cooling tower.

[0015] Furthermore, the heat source auxiliary device may include a pump that circulates the second heat medium, and the second cost may include a cost corresponding to the power consumption of the pump.

[0016] In addition, a portion of the second heat medium in use may be periodically discharged to the outside, and new second heat medium may be replenished from the outside in response to the discharge of the second heat medium, and the second cost may include a cost corresponding to the replenishment amount of the second heat medium.

[0017] The second cost may also include a cost corresponding to the consumption of an agent that suppresses deposition of deposits in the second heat medium. [Effects of the Invention]

[0018] According to the present invention, it is possible to make the heat source system compact. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic diagram showing an example of the configuration of a heat source system according to this embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of a consumption map. [Figure 3] FIG. 3 is a flowchart showing an example of the flow of operations of the central control device. [Figure 4] FIG. 4 is a diagram showing an example of the relationship between the first heat exchange ratio and the second heat exchange ratio and the cost. [Figure 5] FIG. 5 is a diagram showing an example of a heat exchange ratio map. [Figure 6] FIG. 6 is a flowchart showing an example of the flow of operations of the terminal control device. DETAILED DESCRIPTION OF THE INVENTION

[0020] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Dimensions, materials, and other specific values ​​shown in the embodiments are merely examples for facilitating understanding of the invention and do not limit the present invention unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to avoid redundant explanation, and elements not directly related to the present invention are not shown.

[0021] 1 is a schematic diagram showing an example of the configuration of a heat source system 1 according to this embodiment. The heat source system 1 includes a heat source unit 10, an air-side heat exchanger 12, a first heat source unit auxiliary unit 14, a second heat source unit auxiliary unit 16, a first heat load facility 20, a second heat load facility 22, a terminal control device 24, and a central control device 26. For ease of explanation, the first heat source unit auxiliary unit 14 and the second heat source unit auxiliary unit 16 may be collectively referred to simply as heat source unit auxiliary units. The first heat load facility 20 and the second heat load facility 22 may be collectively referred to simply as heat load facility.

[0022] The heat source unit 10 has a first thermal circuit 30 in which a first heat medium circulates. The first heat medium is, for example, water, but is not limited to this example and may be various fluids.

[0023] The air-side heat exchanger 12 is capable of a first type of heat exchange in which the first heat medium is cooled or heated by air. The air-side heat exchanger 12 includes a main body 40 and a first fan .

[0024] The main body 40 is connected to the first thermal circuit 30. The main body 40 includes a pipe through which the first heat medium supplied through the first thermal circuit 30 flows. The main body 40 may be configured so that the surface area of ​​the pipe is relatively large. For example, the main body 40 may be provided with a plurality of fins protruding from the surface of the pipe.

[0025] The first fan 42 can supply air toward the surface of the main body 40 or can suck air from the surface of the main body 40, thereby causing the air on the surface of the main body 40 to flow. In the air-side heat exchanger 12, operation of the first fan 42 can cause heat exchange between the air and the first heat medium supplied to the air-side heat exchanger 12. In other words, the first fan 42 can air-cool the first heat medium or can transfer heat from the air to the first heat medium.

[0026] For example, when the temperature of the first heat medium supplied to the air-side heat exchanger 12 is higher than the temperature of the air, the first fan 42 can cool the first heat medium supplied to the air-side heat exchanger 12 by using the air. Also, when the temperature of the first heat medium supplied to the air-side heat exchanger 12 is lower than the temperature of the air, the first fan 42 can heat the first heat medium supplied to the air-side heat exchanger 12 by using the air.

[0027] The first heat source auxiliary 14 includes a first auxiliary thermal circuit 50, a cooling tower 52, a first auxiliary pump 54, a hot water side heat exchanger 56, a first three-way valve 58A, and a second three-way valve 58B. The cooling tower 52, the first auxiliary pump 54, the first three-way valve 58A, the hot water side heat exchanger 56, and the second three-way valve 58B are provided in the first auxiliary thermal circuit 50.

[0028] A first accessory heat medium flows through the first accessory heat circuit 50. The first accessory heat medium is, for example, water (specifically, cooling water), but is not limited to this example and may be various fluids other than air.

[0029] The cooling tower 52 is capable of cooling the first auxiliary heat medium. Although not shown, the cooling tower 52 includes a cooling tower fan that promotes heat exchange between the first auxiliary heat medium and the air. The cooling tower 52 vaporizes a portion of the first auxiliary heat medium by operating the cooling tower fan, and cools the first auxiliary heat medium by the heat of vaporization.

[0030] The first auxiliary pump 54 is provided, for example, between the outlet of the cooling tower 52 and the inlet of the hot water side heat exchanger 56 in the first auxiliary thermal circuit 50. The first auxiliary pump 54 circulates the first auxiliary heat medium in the first auxiliary thermal circuit 50. For example, the first auxiliary pump 54 supplies the first auxiliary heat medium, which has been cooled by the cooling tower 52, to the hot water side heat exchanger 56.

[0031] The hot water side heat exchanger 56 is connected to the first thermal circuit 30 of the heat source unit 10 and is also connected to the first auxiliary thermal circuit 50 of the first heat source unit auxiliary unit 14.

[0032] The hot water side heat exchanger 56 is capable of exchanging heat between the first heat medium supplied through the first thermal circuit 30 and the first auxiliary heat medium supplied through the first auxiliary heat circuit 50. For example, the hot water side heat exchanger 56 is capable of cooling the first heat medium with the first auxiliary heat medium. Also, for example, the hot water side heat exchanger 56 is capable of heating the first auxiliary heat medium with the first heat medium.

[0033] A first port of the first three-way valve 58A is connected to the outlet of the cooling tower 52 through the first auxiliary pump 54. A second port of the first three-way valve 58A is connected to the inlet of the hot water side heat exchanger 56. A third port of the first three-way valve 58A is connected to the first heat load equipment 20. The first three-way valve 58A is capable of switching between a flow path connecting the cooling tower 52 and the hot water side heat exchanger 56 and a flow path connecting the hot water side heat exchanger 56 and the first heat load equipment 20.

[0034] A first port of the second three-way valve 58B is connected to the inlet of the cooling tower 52. A second port of the second three-way valve 58B is connected to the outlet of the hot water side heat exchanger 56. A third port of the second three-way valve 58B is connected to the first heat load equipment 20. The second three-way valve 58B is capable of switching between a flow path connecting the hot water side heat exchanger 56 and the cooling tower 52 and a flow path connecting the hot water side heat exchanger 56 and the first heat load equipment 20.

[0035] The second heat source auxiliary 16 includes a second auxiliary thermal circuit 60, a heating tower 62, a second auxiliary pump 64, a chilled water side heat exchanger 66, a third three-way valve 68A, and a fourth three-way valve 68B. The heating tower 62, the second auxiliary pump 64, the third three-way valve 68A, the chilled water side heat exchanger 66, and the fourth three-way valve 68B are provided in the second auxiliary thermal circuit 60.

[0036] A second auxiliary heat medium flows through the second auxiliary heat circuit 60. The second auxiliary heat medium is, for example, water (specifically, hot water), but is not limited to this example and may be various fluids other than air.

[0037] The heating tower 62 is capable of heating the second auxiliary heat medium. Although not shown, the heating tower 62 includes a heating tower fan that promotes heat exchange between the second auxiliary heat medium and the air. The heating tower 62 heats a portion of the second auxiliary heat medium with the air by operating the heating tower fan.

[0038] The second auxiliary pump 64 is provided, for example, between the outlet of the heating tower 62 and the inlet of the chilled water side heat exchanger 66 in the second auxiliary thermal circuit 60. The second auxiliary pump 64 circulates the second auxiliary heat medium in the second auxiliary thermal circuit 60. For example, the second auxiliary pump 64 supplies the second auxiliary heat medium, which has been heated by the heating tower 62, to the chilled water side heat exchanger 66.

[0039] The chilled water side heat exchanger 66 is connected to the first thermal circuit 30 of the heat source unit 10 and is also connected to the second auxiliary thermal circuit 60 of the second heat source unit auxiliary unit 16 .

[0040] The chilled water side heat exchanger 66 is capable of exchanging heat between the first heat medium supplied through the first heat circuit 30 and the second auxiliary heat medium supplied through the second auxiliary heat circuit 60. For example, the chilled water side heat exchanger 66 is capable of heating the first heat medium with the second auxiliary heat medium. Also, for example, the chilled water side heat exchanger 66 is capable of cooling the second auxiliary heat medium with the first heat medium.

[0041] A first port of the third three-way valve 68A is connected to the outlet of the heating tower 62 via the second auxiliary pump 64. A second port of the third three-way valve 68A is connected to the inlet of the chilled water side heat exchanger 66. A third port of the third three-way valve 68A is connected to the second heat load equipment 22. The third three-way valve 68A is capable of switching between a flow path connecting the heating tower 62 and the chilled water side heat exchanger 66 and a flow path connecting the chilled water side heat exchanger 66 and the second heat load equipment 22.

[0042] A first port of the fourth three-way valve 68B is connected to the inlet of the heating tower 62. A second port of the fourth three-way valve 68B is connected to the outlet of the chilled water side heat exchanger 66. A third port of the fourth three-way valve 68B is connected to the second heat load equipment 22. The fourth three-way valve 68B is capable of switching between a flow path connecting the chilled water side heat exchanger 66 and the heating tower 62 and a flow path connecting the chilled water side heat exchanger 66 and the second heat load equipment 22.

[0043] The first heat load facility 20 and the second heat load facility 22 are facilities that consume supplied heat, such as air conditioning facilities. Note that the heat load facilities are not limited to the exemplified facilities, and may be various facilities that consume supplied heat.

[0044] Although Figure 1 shows an example in which the first heat load equipment 20 and the second heat load equipment 22 are installed independently, the first heat load equipment 20 and the second heat load equipment 22 may also be installed integrally.

[0045] In the cooling operation in which the cooled heat medium is supplied to the second heat load equipment 22, the third three-way valve 68A and the fourth three-way valve 68B are switched to the flow path connecting the chilled water side heat exchanger 66 and the second heat load equipment 22. The heating tower 62 is thermally isolated from the chilled water side heat exchanger 66. This causes the second auxiliary heat medium to circulate between the chilled water side heat exchanger 66 and the second heat load equipment 22.

[0046] Furthermore, the first three-way valve 58A and the second three-way valve 58B are switched to a flow path connecting the cooling tower 52 and the hot water side heat exchanger 56. The first heat load equipment 20 is thermally isolated from the hot water side heat exchanger 56. As a result, the first auxiliary heat medium circulates between the cooling tower 52 and the hot water side heat exchanger 56.

[0047] In this cooling operation, the hot water heat exchanger 56 cools the first heat medium with the first accessory heat medium, and the cold water heat exchanger 66 cools the second accessory heat medium with the first heat medium. The cold water heat exchanger 66 then supplies the cooled second accessory heat medium to the second heat load equipment 22.

[0048] Furthermore, in the case of a heating operation in which the heated heat medium is supplied to the first heat load equipment 20, the first three-way valve 58A and the second three-way valve 58B are switched to a flow path connecting the hot water side heat exchanger 56 and the first heat load equipment 20. The cooling tower 52 is thermally isolated from the hot water side heat exchanger 56. This causes the first auxiliary heat medium to circulate between the hot water side heat exchanger 56 and the first heat load equipment 20.

[0049] Furthermore, the third three-way valve 68A and the fourth three-way valve 68B are switched to the flow path connecting the heating tower 62 and the chilled water side heat exchanger 66. The second heat load equipment 22 is thermally isolated from the chilled water side heat exchanger 66. As a result, the second auxiliary equipment heat medium circulates between the heating tower 62 and the chilled water side heat exchanger 66.

[0050] In this heating operation, the cold water heat exchanger 66 heats the first heat medium with the second auxiliary heat medium, and the hot water heat exchanger 56 heats the first auxiliary heat medium with the first heat medium. Then, the hot water heat exchanger 56 supplies the heated first auxiliary heat medium to the first heat load equipment 20.

[0051] For ease of explanation, the hot water side heat exchanger 56 in cooling operation and the cold water side heat exchanger 66 in heating operation may be referred to as a tower side heat exchanger. Also, the cold water side heat exchanger 66 in cooling operation and the hot water side heat exchanger 56 in heating operation may be referred to as a load side heat exchanger.

[0052] For ease of explanation, when the first heat medium is cooled or heated by the heat medium of the heat source machine auxiliary, the heat medium of the heat source machine auxiliary may be referred to as the second heat medium. Also, the heat medium cooled or heated by the first heat medium and supplied to the heat load equipment may be referred to as the third heat medium. For example, in the case of a cooling operation, the first auxiliary heat medium is an example of the second heat medium, and the second auxiliary heat medium is an example of the third heat medium. In the case of a heating operation, the second auxiliary heat medium is an example of the second heat medium, and the first auxiliary heat medium is an example of the third heat medium.

[0053] That is, the heat source auxiliary equipment is capable of a second type of heat exchange in which the first heat medium is cooled or heated by a second heat medium different from air. The tower side heat exchanger is capable of cooling or heating the first heat medium by the second heat medium in a fluid state. The load side heat exchanger is capable of cooling or heating the third heat medium supplied to the heat load equipment by the first heat medium.

[0054] In addition to the first thermal circuit 30, the heat source unit 10 includes a compressor 70, a suction side three-way valve 72, a discharge side three-way valve 74, a first node 76, and a second node 78. The compressor 70, the suction side three-way valve 72, the discharge side three-way valve 74, the first node 76, and the second node 78 are provided in the first thermal circuit 30.

[0055] The compressor 70 can compress the first heat medium supplied through the intake port 70A and discharge the compressed first heat medium through the discharge port 70B.

[0056] A first port of the suction side three-way valve 72 is connected to the suction port 70A of the compressor 70. A second port of the suction side three-way valve 72 is connected to the outlet of the chilled water side heat exchanger 66. A third port of the suction side three-way valve 72 is connected to the first node 76.

[0057] A first port of the discharge-side three-way valve 74 is connected to the discharge port 70B of the compressor 70. A second port of the discharge-side three-way valve 74 is connected to the inlet of the hot water-side heat exchanger 56. A third port of the discharge-side three-way valve 74 is connected to the first node 76.

[0058] The first node 76 is connected to the third port of the suction-side three-way valve 72 and the third port of the discharge-side three-way valve 74 , and is also connected to the main body 40 of the air-side heat exchanger 12 .

[0059] The second node 78 is connected to the outlet of the hot water side heat exchanger 56 , the inlet of the cold water side heat exchanger 66 , and the main body 40 of the air side heat exchanger 12 .

[0060] The first heat medium discharged from a discharge port 70B of the compressor 70 flows into a first port of the discharge three-way valve 74. The discharge three-way valve 74 is capable of changing the ratio between the flow rate of the first heat medium flowing out from a second port of the discharge three-way valve 74 and the flow rate of the first heat medium flowing out from a third port of the discharge three-way valve 74. In other words, the discharge three-way valve 74 is capable of changing the ratio between the flow rate of the first heat medium supplied from the discharge port 70B of the compressor 70 to the air-side heat exchanger 12 through the first node 76 and the flow rate of the first heat medium supplied from the discharge port 70B of the compressor 70 to the hot water-side heat exchanger 56.

[0061] The first heat medium flowing out from a first port of the suction-side three-way valve 72 is drawn into the suction port 70A of the compressor 70. The suction-side three-way valve 72 is capable of changing the ratio between the flow rate of the first heat medium flowing into a second port of the suction-side three-way valve 72 and the flow rate of the first heat medium flowing into a third port of the suction-side three-way valve 72. In other words, the suction-side three-way valve 72 is capable of changing the ratio between the flow rate of the first heat medium drawn into the suction port 70A of the compressor 70 from the air-side heat exchanger 12 through the first node 76 and the flow rate of the first heat medium drawn into the suction port 70A of the compressor 70 from the chilled-water heat exchanger 66.

[0062] In the cooling operation, the suction-side three-way valve 72 is controlled so that the first heat medium does not flow into the third port of the suction-side three-way valve 72. That is, in the cooling operation, the first heat medium is drawn into the suction port 70A of the compressor 70 at a flow rate substantially equal to the flow rate flowing out from the outlet of the chilled water-side heat exchanger 66. In addition, in the cooling operation, the first heat medium discharged from the discharge port 70B of the compressor 70 is supplied to the hot water-side heat exchanger 56 and the air-side heat exchanger 12 in accordance with the opening degree of the discharge-side three-way valve 74.

[0063] Furthermore, in the cooling operation, the first heat medium flowing out from the outlet of the hot water side heat exchanger 56 flows into the second node 78, and the first heat medium flowing out from the main body 40 of the air side heat exchanger 12 flows into the second node 78. The first heat medium that flows into the second node 78 then flows out toward the inlet of the cold water side heat exchanger 66. In other words, in the cooling operation, the second node 78 functions as a junction node that can supply the first heat medium, which is a combination of the first heat medium flowing out from the air side heat exchanger 12 and the first heat medium flowing out from the hot water side heat exchanger 56, to the cold water side heat exchanger 66.

[0064] In the heating operation, the discharge-side three-way valve 74 is controlled so that the first heat medium does not flow out from the third port of the discharge-side three-way valve 74. That is, in the heating operation, the first heat medium flows into the inlet of the hot water-side heat exchanger 56 at a flow rate substantially the same as the flow rate discharged from the discharge port 70B of the compressor 70. In addition, in the heating operation, the first heat medium, which is a combination of the first heat medium flowing out from the cold water-side heat exchanger 66 and the first heat medium flowing out from the air-side heat exchanger 12, is drawn into the suction port 70A of the compressor 70 in accordance with the opening degree of the suction-side three-way valve 72.

[0065] Furthermore, in the case of heating operation, the first heat medium flowing out from the outlet of the hot water side heat exchanger 56 flows into the second node 78. Then, the first heat medium flowing into the second node 78 flows out toward the inlet of the cold water side heat exchanger 66 and also flows out toward the main body 40 of the air side heat exchanger 12. In other words, in the case of heating operation, the second node 78 functions as a branch node that can supply the first heat medium flowing out from the hot water side heat exchanger 56 to the air side heat exchanger 12 and the cold water side heat exchanger 66.

[0066] In this way, in the heat source system 1 of this embodiment, both the first type of heat exchange using air and the second type of heat exchange using a second heat medium different from air can be performed using a common heat source unit 10.

[0067] Therefore, in the heat source system 1 of this embodiment, the number of heat source units 10 can be reduced compared to the comparative example in which a water-cooled heat pump type air conditioner and an air-cooled heat pump type air conditioner are simply used together, and the heat source system 1 can be configured compactly.

[0068] The terminal control device 24 is provided near the heat source machine 10 and is capable of controlling at least the heat source machine 10. For example, the terminal control device 24 is capable of controlling the compressor 70, the suction-side three-way valve 72, and the discharge-side three-way valve 74. In addition to the heat source machine 10, the terminal control device 24 may also be capable of controlling one or more of the first fan 42 of the air-side heat exchanger 12, the cooling tower fan of the cooling tower 52, the first auxiliary pump 54, the first three-way valve 58A, the second three-way valve 58B, the heating tower fan of the heating tower 62, the second auxiliary pump 64, the third three-way valve 68A, and the fourth three-way valve 68B.

[0069] Although not shown, the terminal control device 24 may include one or more processors, one or more memories, and storage. The terminal control device 24 operates when the processor executes a program stored in the memory. The storage may store various types of data used by the terminal control device 24.

[0070] The central control device 26 is installed, for example, at a location different from the premises where the terminal control device 24 is installed. The central control device 26 can communicate with the terminal control device 24 via various communication networks, such as the Internet, a telephone network, or a dedicated communication network. The central control device 26 can control the terminal control device 24 from a remote location via the communication network. The central control device 26 can indirectly control the heat source unit 10, the air-side heat exchanger 12, the first heat source unit auxiliary unit 14, and the second heat source unit auxiliary unit 16 via the terminal control device 24.

[0071] Although not shown, the central control device 26 may include one or more processors, one or more memories, and storage. The central control device 26 operates when the processor executes a program stored in the memory. The storage may store various types of data used by the central control device 26.

[0072] For ease of explanation, the ratio of the first type of heat exchange to the combined heat exchange of the first type of heat exchange using air and the second type of heat exchange using a second heat medium other than air may be referred to as the first heat exchange ratio. The first heat exchange ratio means the degree to which the first type of heat exchange is performed. Furthermore, the ratio of the second type of heat exchange to the combined heat exchange of the first type of heat exchange using air and the second type of heat exchange using a second heat medium other than air may be referred to as the second heat exchange ratio. The second heat exchange ratio means the degree to which the second type of heat exchange is performed. The sum of the first heat exchange ratio and the second heat exchange ratio is 100%.

[0073] The following describes the operation of the central control device 26 and the terminal control device 24 when performing a cooling operation as an example. However, the central control device 26 and the terminal control device 24 when performing a heating operation may also perform substantially the same operations as the central control device 26 and the terminal control device 24 when performing a cooling operation.

[0074] FIG. 2 is a diagram showing an example of a consumption map. The consumption map shows the power consumption corresponding to a first heat exchange ratio and the power consumption corresponding to a second heat exchange ratio. The consumption map is prepared in advance for each load factor of the heat source unit 10. The consumption map may be stored in the memory or storage of the central control device 26. FIG. 2 shows an example of a consumption map when the load factor of the heat source unit 10 is 50%.

[0075] In FIG. 2, the "power consumption of the heat source unit" for the "first type of heat exchange portion" includes the power consumption of the compressor 70 and the power consumption of the first fan 42 when the air-side heat exchanger 12 is operated at the first heat exchange ratio. The "power consumption of the heat source unit" for the "second type of heat exchange portion" is the power consumption of the compressor 70 when the heat source unit auxiliary (e.g., the first heat source unit auxiliary 14) is operated at the second heat exchange ratio. The "power consumption of the cooling tower fan" is the power consumption of the cooling tower 52 (more specifically, the cooling tower fan) when the first heat source unit auxiliary 14 is operated at the second heat exchange ratio. The "power consumption of the first auxiliary pump" is the power consumption of the first auxiliary pump 54 when the first heat source unit auxiliary 14 is operated at the second heat exchange ratio.

[0076] In the heat source system 1, in the cooling operation, an agent for suppressing deposition of deposits in the first auxiliary heat medium (second heat medium) is used in the first auxiliary heat circuit 50. "Consumption of agent in the first auxiliary heat circuit" means the consumption of agent used in the first auxiliary heat circuit 50 when the first heat source auxiliary 14 is operated at the second heat exchange ratio.

[0077] In the heat source system 1, during cooling operation, a portion of the first auxiliary heat medium in use is periodically discharged to the outside, and new first auxiliary heat medium is replenished from the outside in accordance with the discharge of the first auxiliary heat medium. The "supply amount of first auxiliary heat medium" refers to the replenishment amount of the first auxiliary heat medium when the first heat source auxiliary device 14 is operated at the second heat exchange ratio.

[0078] Each data item in the consumption map may be corrected based on weather forecast data such as temperature and humidity.

[0079] Furthermore, in the heat source system 1, during heating operation, an agent for suppressing deposition of deposits in the second auxiliary heat medium (in the second heat medium) may be used in the second auxiliary heat circuit 60. Furthermore, in the heat source system 1, during heating operation, a portion of the second auxiliary heat medium in use may be periodically discharged to the outside, and new second auxiliary heat medium may be replenished from the outside in response to the discharge of the second auxiliary heat medium. The consumption map may include items for the power consumption of the heating tower fan, the power consumption of the second auxiliary pump 64, the amount of agent consumed in the second auxiliary heat circuit 60, and the amount of second auxiliary heat medium replenished when the second heat source auxiliary is operated at the second heat exchange ratio.

[0080] Fig. 3 is a flowchart showing an example of the flow of operation of central control device 26. When a predetermined start condition is satisfied, central control device 26 starts the series of processes shown in Fig. 3. The predetermined start condition may be, for example, reaching a predetermined time point (for example, 12 o'clock), but is not limited to this example and may be various other conditions.

[0081] The central control device 26 determines one load rate from among a plurality of load rates (S10). The plurality of load rates may include values ​​between 0% and 100% at 10% intervals, for example.

[0082] The central control device 26 refers to a pre-stored consumption map and derives a first cost for each first heat exchange ratio at a predetermined load factor (for example, the load factor determined in step S10) in the heat source device 10 (S11). The first cost represents the cost of the heat source device 10 required when the air-side heat exchanger 12 is operated at the first heat exchange ratio. The first cost may include a cost corresponding to the power consumption of the first fan.

[0083] Fig. 4 is a diagram showing an example of the relationship between the first heat exchange ratio and the second heat exchange ratio and the cost when the load factor is 50%.

[0084] In Fig. 4, the black squares and the dashed-dotted line A10 indicate an example of the first cost. For example, the first cost may be derived at 10% intervals between the first heat exchange ratio of 0% and 100%, as indicated by the black squares in Fig. 4. As shown in Fig. 4, the first cost increases as the first heat exchange ratio increases.

[0085] The central control device 26 may derive the first cost from, for example, the power consumption of the heat source unit 10 for the first type of heat exchange corresponding to the first heat exchange ratio and the latest electricity tariff. The latest electricity tariff may be stored in the storage of the central control device 26.

[0086] 3, after deriving the first cost, the central control device 26 refers to a pre-stored consumption map and derives a second cost for each second heat exchange ratio at a predetermined load factor of the heat source unit (for example, the load factor determined in step S10) (S12). The second cost represents the cost of the heat source unit 10 required when the tower-side heat exchanger is operated at the second heat exchange ratio.

[0087] In Fig. 4, the black triangles and the two-dot chain line A12 indicate an example of the second cost. For example, the second cost may be derived at 10% intervals between the second heat exchange ratio of 0% and 100%, as indicated by the black triangles in Fig. 4. As shown in Fig. 4, the second cost increases as the second heat exchange ratio increases.

[0088] The second cost includes at least the power consumption of the heat source unit 10 for the second type of heat exchange. In the case of the cooling operation, the second cost may include one or more of the cost corresponding to the power consumption of the cooling tower 52 (more specifically, the cooling tower fan), the cost corresponding to the power consumption of the first auxiliary pump 54, the cost corresponding to the consumption of the agent in the first auxiliary thermal circuit 50, and the cost corresponding to the replenishment amount of the first auxiliary heat medium.

[0089] For example, the central control device 26 may derive the electricity cost within the second cost from the power consumption of the heat source unit 10 for the second type of heat exchange corresponding to the second heat exchange ratio, the power consumption of the cooling tower fan, and the power consumption of the first auxiliary pump 54, and the latest electricity rate table. The central control device 26 may derive the chemical cost within the second cost from the amount of chemical consumed in the first auxiliary heat circuit 50 corresponding to the second heat exchange ratio and the latest unit price of the chemical. The latest unit price of the chemical may be stored in the storage of the central control device 26. The central control device 26 may derive the water cost within the second cost from the amount of replenishment of the first auxiliary heat medium corresponding to the second heat exchange ratio and the latest water rate table. The latest water rate table may be stored in the storage of the central control device 26. The central control device 26 may derive the second cost by summing the derived electricity cost, chemical cost, and water cost.

[0090] The second cost may include the cost of maintenance for cleaning the heat source auxiliary equipment. In this case, the consumption map may include an item indicating the frequency of maintenance of the heat source auxiliary equipment.

[0091] In addition, in the case of heating operation, the second cost may include one or more of the cost corresponding to the power consumption of the heating tower 62 (more specifically, the heating tower fan), the cost corresponding to the power consumption of the second auxiliary pump 64, the cost corresponding to the consumption of the chemical agent in the second auxiliary thermal circuit 60, and the cost corresponding to the replenishment amount of the second auxiliary thermal medium.

[0092] As shown in FIG. 3, after deriving the second cost, the central control unit 26 derives a total cost by adding up the first cost and the second cost at a predetermined load rate (e.g., the load rate determined in step S10) for each of the first heat exchange ratio and the second heat exchange ratio (S13).

[0093] In Fig. 4, the black circles and solid line A14 indicate an example of the total cost. As indicated by the black circles in Fig. 4, the total cost may be calculated for the first heat exchange ratio and the second heat exchange ratio in 10% intervals between 0% and 100%.

[0094] As shown in FIG. 3, after deriving the total cost, the central control unit 26 derives at least one of the first heat exchange ratio that minimizes the total cost and the second heat exchange ratio that minimizes the total cost at a predetermined load factor (e.g., the load factor determined in step S10) (S14).

[0095] In the example of Fig. 4, as shown in the area B10 surrounded by a dashed line, the total cost is minimum when the first heat exchange ratio is "30%" and the second heat exchange ratio is "70%." Therefore, in the example of Fig. 4, the first heat exchange ratio "30" and the second heat exchange ratio "70%" that minimize the total cost may be derived.

[0096] As shown in FIG. 3, after step S14, the central control device 26 associates the predetermined load rate (e.g., the load rate determined in step S10), the minimum total cost, and the derived first heat exchange ratio and second heat exchange ratio, and stores them in memory or storage (S15).

[0097] As shown in FIG. 3, after step S15, the central control device 26 determines whether there are any remaining load factors that have not been selected among the plurality of load factors (S16).

[0098] If it is determined that there are remaining load factors (YES in S16), the central control device 26 returns to step S10 and determines one load factor from the remaining unselected load factors (S10).The central control device then performs the processes from step S11 onwards for the redetermined load factor.

[0099] That is, the central control device 26 derives at least one of the first heat exchange ratio that minimizes the total cost and the second heat exchange ratio that minimizes the total cost for each load factor of the heat source unit 10.

[0100] In step S16, if it is determined that there is no remaining load factor (NO in S16), the central control device 26 creates a heat exchange ratio map (S17).

[0101] 5 is a diagram showing an example of a heat exchange ratio map. The heat exchange ratio map shows the relationship between the load factor and the heat exchange ratio of the heat source unit 10. The heat exchange ratio map includes at least one of a first heat exchange ratio for each load factor of the heat source unit 10 and a second heat exchange ratio for each load factor of the heat source unit 10.

[0102] More specifically, the heat exchange ratio map may represent the relationship between the load factor of the heat source unit 10 and the first heat exchange ratio at which the total cost is minimized. The heat exchange ratio map may also represent the relationship between the load factor of the heat source unit 10 and the first heat exchange ratio at which the total cost is minimized. The heat exchange ratio map may include at least one of the first heat exchange ratio at which the total cost is minimized for each load factor of the heat source unit 10 and the second heat exchange ratio at which the total cost is minimized for each load factor of the heat source unit 10.

[0103] The central control device 26 may create the heat exchange ratio map by at least one of associating the load factor of the heat source device 10 with the first heat exchange ratio that minimizes the total cost for each load factor of the heat source device 10, and associating the load factor of the heat source device 10 with the second heat exchange ratio that minimizes the total cost for each load factor of the heat source device 10. The central control device 26 may store the created heat exchange ratio map in memory or storage.

[0104] As shown in FIG. 3, after creating the heat exchange ratio map, the central control device 26 transmits the created heat exchange ratio map to the terminal control device 24 (S18), and the series of processes in FIG. 3 ends.

[0105] Upon receiving the heat exchange ratio map, the terminal control device 24 stores the received heat exchange ratio map in a memory or storage.

[0106] 3 to 5, the total cost is derived, and a heat exchange ratio map is created in which the first heat exchange ratio and the second heat exchange ratio that minimize the total cost are associated with each load factor of the heat source unit 10. However, without being limited to the example of total cost, for example, the central control unit 26 may create a heat exchange ratio map in which the first heat exchange ratio and the second heat exchange ratio that minimize the energy consumption are associated with each load factor of the heat source unit 10. Furthermore, the central control unit 26 may derive the total value of CO2 (carbon dioxide) emissions, and create a heat exchange ratio map in which the first heat exchange ratio and the second heat exchange ratio that minimize the CO2 emissions are associated with each load factor of the heat source unit 10.

[0107] Fig. 6 is a flowchart showing an example of the flow of operations of the terminal control device 24. The terminal control device 24 executes the series of processes shown in Fig. 6, for example, every time a predetermined interrupt timing occurs, which is repeated at predetermined time intervals.

[0108] When a predetermined interrupt timing arrives, the terminal control device 24 derives the current load factor of the heat source device 10 (S31). For example, the terminal control device 24 may derive the current load factor of the heat source device 10 based on the inlet temperature of the third heat medium in the load-side heat exchanger (for example, the chilled water-side heat exchanger 66 in the case of cooling operation), the outlet temperature of the third heat medium, and the flow rate of the third heat medium.

[0109] Next, the terminal control device 24 determines at least one of the first heat exchange ratio and the second heat exchange ratio corresponding to the current load factor of the heat source device 10 based on the stored heat exchange ratio map (S32). Note that if the determination of the first heat exchange ratio is omitted, the terminal control device 24 can derive the first heat exchange ratio from the second heat exchange ratio by determining the second heat exchange ratio. Also, if the determination of the second heat exchange ratio is omitted, the terminal control device 24 can derive the second heat exchange ratio from the first heat exchange ratio by determining the first heat exchange ratio.

[0110] For example, if the current load factor is "50%", the terminal control device 24 may determine "30%" as the first heat exchange ratio and "70%" as the second heat exchange ratio, as shown in the area C10 surrounded by dashed lines in Figure 5.

[0111] As shown in FIG. 6, after step S32, the terminal control device 24 controls the operation of the heat source unit, the air-side heat exchanger, and the heat source unit auxiliary units based on the first heat exchange ratio and the second heat exchange ratio determined in step S32 (S33).

[0112] For example, if the first heat exchange ratio is determined to be "30%" and the second heat exchange ratio is determined to be "70%," the terminal control device 24 may perform control as follows. By controlling the aperture of the discharge-side three-way valve 74, the terminal control device 24 may cause the flow rate of the first heat medium flowing into the air-side heat exchanger 12 to be "30%" of the total amount of the first heat medium discharged by the compressor 70, and the flow rate of the first heat medium flowing into the hot water-side heat exchanger 56 to be "70%" of the total amount of the first heat medium discharged by the compressor 70. The terminal control device 24 may set the rotation speed of the first fan 42 of the air-side heat exchanger 12 to be "30%" of the rated rotation speed, and may set the rotation speed of the cooling tower fan to be such that the heat dissipation amount of the cooling tower 52 is "70%" of the rated heat dissipation amount. The terminal control device 24 may set the rotation speed of the first auxiliary pump 54 to a rotation speed such that the flow rate of the first auxiliary heat medium is "70%" of the rated flow rate.

[0113] As described above, the heat source system 1 of this embodiment comprises a heat source unit 10 having a first thermal circuit 30 through which a first heat medium circulates, an air-side heat exchanger 12 capable of a first type of heat exchange in which the first heat medium is cooled or heated by air, a heat source unit auxiliary unit (e.g., first heat source unit auxiliary unit 14) capable of a second type of heat exchange in which the first heat medium is cooled or heated by a second heat medium (e.g., first auxiliary heat medium) different from air, and a load-side heat exchanger (e.g., chilled water-side heat exchanger 66) capable of cooling or heating a third heat medium (e.g., second auxiliary heat medium) supplied to a heat load equipment (e.g., second heat load equipment 22) by the first heat medium.

[0114] As a result, the heat source system 1 of this embodiment can perform both a first type of heat exchange using air and a second type of heat exchange using a second heat medium different from air, using a common heat source unit 10.

[0115] Therefore, in the heat source system 1 of this embodiment, the number of heat source units 10 can be reduced compared to the comparative example in which a water-cooled heat pump type air conditioner and an air-cooled heat pump type air conditioner are simply used together, and the heat source system 1 can be configured compactly.

[0116] Furthermore, the central control device 26 of the heat source system 1 of this embodiment creates a heat exchange ratio map including at least one of a first heat exchange ratio for each load factor of the heat source machine 10 and a second heat exchange ratio for each load factor of the heat source machine 10, and transmits the heat exchange ratio map to the terminal control device 24. The terminal control device 24 of the heat source system 1 of this embodiment derives the current load factor of the heat source machine 10, determines at least one of the first heat exchange ratio and the second heat exchange ratio that corresponds to the current load factor of the heat source machine 10 based on the heat exchange ratio map, and controls the heat source machine 10, the air-side heat exchanger 12, and the heat source machine auxiliary equipment based on the determined first heat exchange ratio and second heat exchange ratio.

[0117] As a result, in the heat source system 1 of this embodiment, the first heat exchange ratio and the second heat exchange ratio can be made different depending on the current load factor of the heat source unit 10.

[0118] For this reason, in the heat source system 1 of this embodiment, it is possible to change the balance between the ratio of the first type of heat exchange (first heat exchange ratio) and the ratio of the second type of heat exchange (second heat exchange ratio) according to the load factor of the heat source unit 10. As a result, in the heat source system 1 of this embodiment, it is possible to improve the efficiency (for example, COP) of the heat source system 1.

[0119] Furthermore, the central control device 26 of the heat source system 1 of this embodiment derives, for each first heat exchange ratio, a first cost required to operate the air-side heat exchanger 12 at a first heat exchange ratio at a predetermined load factor in the heat source unit 10. The central control device 26 of the heat source system 1 of this embodiment derives, for each second heat exchange ratio, a second cost required to operate the heat source unit auxiliary equipment at a second heat exchange ratio at a predetermined load factor. The central control device 26 of the heat source system 1 of this embodiment derives, for each first heat exchange ratio and second heat exchange ratio at a predetermined load factor, a total cost that is the sum of the first cost and the second cost. The central control device 26 of the heat source system 1 of this embodiment derives at least one of the first heat exchange ratio that minimizes the total cost and the second heat exchange ratio that minimizes the total cost at a predetermined load factor. The central control device 26 of the heat source system 1 of this embodiment derives at least one of the first heat exchange ratio that minimizes the total cost and the second heat exchange ratio that minimizes the total cost for each load factor of the heat source unit 10. The central control device 26 of the heat source system 1 of this embodiment creates a heat exchange ratio map by at least one of associating the load factor of the heat source unit 10 with the first heat exchange ratio that minimizes the total cost for each load factor of the heat source unit 10, and associating the load factor of the heat source unit 10 with the second heat exchange ratio that minimizes the total cost for each load factor of the heat source unit 10.

[0120] As a result, in the heat source system 1 of this embodiment, the first heat exchange ratio and the second heat exchange ratio that minimize the total cost are selected based on the created heat exchange ratio map.

[0121] Therefore, in the heat source system 1 of this embodiment, the operating costs of the heat source system 1 can be effectively reduced.

[0122] While the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such embodiments. It is clear that those skilled in the art can conceive of various modifications and alterations within the scope of the claims, and it is understood that such modifications and alterations also fall within the technical scope of the present invention.

[0123] For example, in the above embodiment, both the cooling tower 52 and the heating tower 62 are provided. However, when the heat source system 1 performs only the cooling operation, the heating tower 62 may be omitted, and when the heat source system 1 performs only the heating operation, the cooling tower 52 may be omitted.

[0124] In the above embodiment, the first heat exchange ratio and the second heat exchange ratio are determined based on the heat exchange ratio map and the current load factor. However, if a specific condition is met, the terminal control device 24 may set the first heat exchange ratio to "0%" (in other words, the second heat exchange ratio to "100%) regardless of the heat exchange ratio map. The specific condition may be when the temperature of the air intake of the air-side heat exchanger 12 is equal to or higher than a predetermined temperature or the outside air temperature obtained from weather data, and the load factor is equal to or higher than a predetermined threshold. In this example, if the load factor falls below the predetermined threshold, the terminal control device 24 may return to control based on the heat exchange ratio map and the current load factor.

[0125] Furthermore, the heat source unit 10 in the above embodiment is not limited to a heat source unit 10 that cools or heats the first heat medium using a heat pump, but may be a heat source unit 10 that cools or heats the room by circulating the first heat medium inside the room.

[0126] Also provided are programs that cause a computer to function as the terminal control device 24 and the central control device 26, and storage media on which the programs are recorded, such as computer-readable flexible disks, magneto-optical disks, ROMs, CDs, DVDs, and BDs. Here, the program refers to data processing means written in any language or description method.

[0127] It should be noted that the processes shown in this specification do not necessarily have to be performed in chronological order according to the order shown in the flowcharts, and may include parallel or subroutine processes. [Explanation of symbols]

[0128] 1 Heat source system 10 Heat source machine 12 Air side heat exchanger 14 1st heat source equipment auxiliary equipment 16 2nd heat source equipment auxiliary equipment 20 1st heat load equipment 22 2nd heat load equipment 24 Terminal control device 26 Central Control Unit 30 1st thermal circuit 42 First Fan 52 Cooling Tower 54 No. 1 auxiliary pump 56 Hot water side heat exchanger 62 Heating Tower 66 Cold water side heat exchanger 70 Compressor 72 Intake side three-way valve 74 Discharge side three-way valve 78 Second Node

Claims

1. a heat source machine having a first thermal circuit through which a first heat medium circulates; an air-side heat exchanger capable of a first type of heat exchange in which the first heat medium is cooled or heated by air; a heat source auxiliary device capable of a second type of heat exchange in which the first heat medium is cooled or heated by a second heat medium different from air; a load-side heat exchanger capable of cooling or heating a third heat medium to be supplied to a heat load facility by the first heat medium; Equipped with the air-side heat exchanger includes a first fan capable of transferring heat of air to the first heat medium; The heat source auxiliary equipment includes: a heating tower capable of heating the second heat medium; a tower-side heat exchanger capable of heating the first heat medium with the second heat medium in a fluid state; Including, The heat source unit includes a compressor that compresses the first heat medium, The first thermal circuit comprises: a branch node capable of supplying the first heat medium flowing out from the load-side heat exchanger to the air-side heat exchanger and the tower-side heat exchanger; an intake-side three-way valve capable of changing a ratio between a flow rate of the first heat medium sucked into the compressor from the air-side heat exchanger and a flow rate of the first heat medium sucked into the compressor from the tower-side heat exchanger; Including, Heat source system.

2. a heat source machine having a first thermal circuit through which a first heat medium circulates; an air-side heat exchanger capable of a first type of heat exchange in which the first heat medium is cooled or heated by air; a heat source auxiliary device capable of a second type of heat exchange in which the first heat medium is cooled or heated by a second heat medium different from air; a load-side heat exchanger capable of cooling or heating a third heat medium to be supplied to a heat load facility by the first heat medium; A terminal control device provided near the heat source machine and capable of controlling at least the heat source machine; a central control unit capable of remotely controlling the terminal control units; Equipped with a ratio of the first type of heat exchange to a combined heat exchange of the first type of heat exchange and the second type of heat exchange is a first heat exchange ratio; a ratio of the second type of heat exchange to a combined heat exchange of the first type of heat exchange and the second type of heat exchange is a second heat exchange ratio; The central control unit creating a heat exchange ratio map including at least one of the first heat exchange ratio for each load factor of the heat source machine and the second heat exchange ratio for each load factor of the heat source machine; transmitting the heat exchange ratio map to the terminal control device; The terminal control device Derive the current load factor of the heat source machine; determining at least one of the first heat exchange ratio and the second heat exchange ratio corresponding to a current load factor of the heat source machine based on the heat exchange ratio map; controlling the heat source unit, the air-side heat exchanger, and the heat source unit auxiliary unit based on the determined first heat exchange ratio and the determined second heat exchange ratio; Heat source system.

3. The central control unit deriving a first cost required for operating the air-side heat exchanger at the first heat exchange ratio at a predetermined load factor of the heat source machine, for each of the first heat exchange ratios; deriving a second cost required for operating the heat source auxiliary machine at the second heat exchange ratio at the predetermined load factor for each of the second heat exchange ratios; deriving a total cost obtained by adding up the first cost and the second cost for each of the first heat exchange ratio and the second heat exchange ratio at the predetermined load factor; deriving at least one of the first heat exchange ratio at which the total cost is minimized and the second heat exchange ratio at which the total cost is minimized at the predetermined load factor; deriving at least one of the first heat exchange ratio that minimizes the total cost and the second heat exchange ratio that minimizes the total cost for each load factor of the heat source machine; creating the heat exchange ratio map by at least one of associating the load rate of the heat source machine with the first heat exchange ratio at which the total cost is minimized for each load rate of the heat source machine, and associating the load rate of the heat source machine with the second heat exchange ratio at which the total cost is minimized for each load rate of the heat source machine; The heat source system according to claim 2 .

4. the air-side heat exchanger includes a first fan capable of air-cooling the first heat medium or transferring heat of air to the first heat medium; the first cost includes a cost corresponding to the power consumption of the first fan; The heat source system according to claim 3 .

5. the heat source auxiliary machine includes a cooling tower capable of cooling the second heat medium, The second cost includes a cost corresponding to the power consumption of the cooling tower. The heat source system according to claim 3 .

6. the heat source auxiliary machine includes a pump that circulates the second heat medium, the second cost includes a cost corresponding to the power consumption of the pump; The heat source system according to claim 3 .

7. A part of the second heat medium in use is periodically discharged to the outside, and new second heat medium is replenished from the outside in response to the discharge of the second heat medium; the second cost includes a cost corresponding to a replenishment amount of the second heat medium. The heat source system according to claim 3 .

8. the second cost includes a cost corresponding to consumption of an agent that suppresses deposition of a deposit in the second heat medium; The heat source system according to claim 3 .

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