Heat source system

Abstract

This invention provides a heat source system that can estimate the degree of contamination according to the type of fluid. [Solution] The heat source system 1A includes a heat source that performs at least one of cooling and heating of the first fluids FH and FL, a heat exchanger 72 that causes heat exchange between the first fluids FH and FL and the second fluid FT, heat exchange amount detection units 73, 74, and 76 that detect the amount of heat exchanged between the first fluids FH and FL and the second fluid FT, a pressure difference detection unit 75 that detects the difference between the pressure of the second fluid FT flowing into the heat exchanger 72 and the pressure of the second fluid FT flowing out of the heat exchanger 72, and a determination unit 61 that determines the degree of contamination of the second fluid FT based on the value obtained by dividing the amount of heat exchanged detected by the heat exchange amount detection units 73, 74, and 76 by the pressure difference detected by the pressure difference detection unit 75.

Description

【Technical Field】 【0001】 This disclosure relates to a heat source machine system. 【Background Art】 【0002】 Buildings are equipped with building facilities such as air conditioning facilities, sanitary facilities, and electrical facilities. When installing building facilities in a building, traditionally, various types of equipment, pipes, and electric wires are individually carried into the site, the equipment is installed in a predetermined location, and the pipes and electric wires are cut to a length corresponding to the building and assembled. As an attempt to reduce the man-hours required in such a traditional construction method, there is a water supply unit in which a piping device including a pump is housed in a cabinet, and a piping stand is connected to the lower part of the cabinet to support the piping device from below (see, for example, Patent Document 1). 【Prior Art Documents】 【Patent Documents】 【0003】 【Patent Document 1】 Japanese Patent Application Laid-Open No. 2023-040920 【Summary of the Invention】 【Problems to be Solved by the Invention】 【0004】 The technology described in Patent Document 1 unitizes around the water supply pump. However, if unitization can also be applied to other parts of the building facilities, more man-hours can be reduced and quality improvement can also be expected. In addition, when the type of fluid handled by the equipment changes, it may be difficult to estimate according to the actual degree of dirt. 【0005】 In view of the above problems, this disclosure relates to providing a heat source machine system capable of estimating the degree of dirt according to the type of fluid. 【Means for Solving the Problems】 【0006】 A heat source system according to a first aspect of the present disclosure comprises: a heat source that performs at least one of cooling and heating of a first fluid; a heat exchanger that causes heat exchange between the first fluid and a second fluid; an exchange heat amount detection unit that detects the amount of heat exchanged between the first fluid and the second fluid; a pressure difference detection unit that detects the difference between the pressure of the second fluid flowing into the heat exchanger and the pressure of the second fluid flowing out of the heat exchanger; and a determination unit that determines the degree of contamination of the second fluid based on a value obtained by dividing the amount of heat exchanged detected by the exchange heat amount detection unit by the pressure difference detection unit. 【0007】 Furthermore, as a heat source system according to a second aspect of the present disclosure, in the heat source system according to the first aspect of the present disclosure, the determination unit may recommend maintenance and inspection when the fouling coefficient, which is the value obtained by dividing the amount of heat exchanged detected by the heat exchange amount detection unit by the pressure difference detected by the pressure difference detection unit, falls below a predetermined standard value. 【0008】 Furthermore, as a heat source system according to a third aspect of the present disclosure, the heat source system according to the first or second aspect of the present disclosure may include an IO-Link® device provided in each of the heat exchange amount detection unit and the pressure difference detection unit, and at least one IO-Link master that receives signals from a plurality of IO-Link devices. 【0009】 Furthermore, as a heat source system according to a fourth aspect of the present disclosure, a heat source system according to any one of the first to third aspects of the present disclosure may have a plurality of heat sources and a frame for supporting the plurality of heat sources. 【0010】 A fifth aspect of the heat source system of this disclosure may include a heat source unit in which a plurality of heat source units are supported on a first frame; a switching unit in which a first pipe for receiving a first type of fluid from a first inlet and discharging it from a first outlet, a second pipe for receiving a second type of fluid from a second inlet and discharging it from a second outlet, and a switching pipe connecting the first pipe and the second pipe so as to receive the first type of fluid from the first inlet and discharging it from the second outlet, and also receiving the second type of fluid from the second inlet and discharging it from the first outlet, is supported on a second frame; and a connecting pipe for connecting each of the heat source units of the heat source unit and the first pipe and the second pipe of the switching unit. 【0011】 With this configuration, a high-quality heat source system can be constructed in a relatively short timeframe by installing the factory-manufactured heat source unit and switching unit on-site and connecting them with connecting pipes. 【0012】 Furthermore, as a heat source system according to the sixth aspect of this disclosure, the heat source system according to the fifth aspect of this disclosure may include a heat exchange unit supported on a third frame, comprising: a first heat exchanger that performs heat exchange between a fluid discharged from the first outlet and a heat load treatment fluid used for processing a heat load; and a second heat exchanger that performs heat exchange between a fluid discharged from the second outlet and a heat dissipation / heat extraction fluid used for heat dissipation or heat extraction; a first relay pipe connecting the first pipe and the first heat exchanger; and a second relay pipe connecting the second pipe and the second heat exchanger. 【0013】 With this configuration, the heat-releasing fluid does not flow into the heat source unit, thus reducing the decrease in the heat source unit's capacity. 【0014】 Furthermore, as a heat source system according to the seventh aspect of this disclosure, the heat source system according to the sixth aspect of this disclosure may include: an exchange heat amount detection unit for detecting the amount of heat exchanged between the fluid discharged from the second outlet and the heat-releasing fluid in the second heat exchanger; a pressure difference detection unit for detecting the difference between the pressure of the heat-releasing fluid flowing into the second heat exchanger and the pressure of the heat-releasing fluid discharged from the second heat exchanger; and a determination unit for determining the degree of contamination of the heat-releasing fluid based on a value obtained by dividing the exchange heat amount detected by the exchange heat amount detection unit by the pressure difference detected by the pressure difference detection unit. 【0015】 This configuration makes it possible to perform maintenance, such as cleaning the flow paths of the heat dissipation and extraction fluid system, in a timely manner. 【0016】 Furthermore, as a heat source system according to the eighth aspect of this disclosure, in a heat source system according to any one of the fifth to seventh aspects of this disclosure, the first frame and the second frame may be formed to the same size. Also, the third frame may be formed to the same size as at least one of the first frame and the second frame. 【0017】 With this configuration, the same frame can be used for both the first and second frames, thereby improving production efficiency. 【0018】 Furthermore, as a heat source system according to the ninth aspect of the present disclosure, a heat source system according to any one of the fifth to eighth aspects of the present disclosure may be provided with a wiring rack for housing electrical wiring, and the heat source unit and the switching unit may be arranged at a distance equal to the width of the wiring rack. 【0019】 This configuration allows for a neat and tidy installation of the wiring rack. 【0020】 Further, as a heat source machine system according to the tenth aspect of the present disclosure, in the heat source machine system according to any one of the fifth to ninth aspects of the present disclosure, the heat source machine unit and the switching unit may each have a plurality of IO-Link (registered trademark) devices and at least one IO-Link master that receives signals from the IO-Link devices. Further, the heat exchange unit may have a plurality of IO-Link devices and at least one IO-Link master that receives signals from the IO-Link devices. 【0021】 With this configuration, communication lines can be aggregated in each unit, and relatively few communication lines are required to connect each unit to the upper control panel. 【0022】 Further, as a heat source machine system according to the eleventh aspect of the present disclosure, in the heat source machine system according to any one of the fifth to tenth aspects of the present disclosure, a light-shielding panel that blocks light and is attached to at least a part of at least one of the first pedestal and the second pedestal may be provided. Further, the light-shielding panel may be attached to at least a part of the third pedestal. 【0023】 With this configuration, it is possible to protect the equipment or piping without individually racking them, and since there is no need to remove the racking, maintenance of the equipment or piping becomes easier. 【0024】 Further, as a heat source machine system according to the twelfth aspect of the present disclosure, in the heat source machine system according to any one of the fifth to eleventh aspects of the present disclosure, a solar panel attached to at least one of the first pedestal and the second pedestal may be provided. Further, the solar panel may be attached to the third pedestal. 【0025】 With this configuration, it becomes possible to cover part or all of the power used by the heat source machine unit and / or the switching unit. 【Advantages of the Invention】 【0026】 According to the present disclosure, by estimating the degree of contamination according to the type of fluid, it is possible to make an estimation in line with the actual degree of contamination and estimate the timing of maintenance inspection. Further, when the heat source unit and the switching unit manufactured in the factory are installed on site and connected by connecting pipes, a high-quality heat source system can be constructed in a relatively short construction period. 【Brief Description of the Drawings】 【0027】 [Figure 1] FIG. 1 is a schematic system diagram showing a schematic configuration of a heat source system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a diagram showing a schematic configuration of a pipe group of a heat source unit included in the heat source system according to an embodiment of the present disclosure. [Figure 3] FIG. 3 is a schematic system diagram showing a schematic configuration of a heat source system according to a modification of an embodiment of the present disclosure. 【Embodiments for Carrying Out the Invention】 【0028】 Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each figure, members that are the same or corresponding to each other are given the same or similar reference numerals, and redundant descriptions are omitted. Also, the dimensions and ratios in the drawings are exaggerated for the convenience of explanation and may be different from the actual ratios. 【0029】 First, referring to FIG. 1, a heat source system 1 according to an embodiment of the present disclosure will be described. FIG. 1 is a schematic system diagram showing a schematic configuration of the heat source system 1. The heat source system 1 mainly includes a heat source unit 10, a switching unit 20, and a connecting pipe 40 that connects the flow paths of the fluids passing through these units 10 and 20. Further, in this modification, the heat source system 1 also includes a wiring rack 53. 【0030】 The heat source unit 10 includes a plurality of heat source units 12, piping that forms fluid passages for fluids entering and leaving each heat source unit 12, and a support frame 18. In this embodiment, the heat source unit 10 has six heat source units 12, but the number of heat source units 12 can be determined according to the capacity of each heat source unit 12 and the magnitude of the heat load to be processed. 【0031】 In this embodiment, the heat source unit 12 is a device that introduces a relatively low-temperature fluid FL and a relatively high-temperature fluid FH, and transfers the heat contained in the low-temperature fluid FL to the high-temperature fluid FH via a circulating refrigerant (not shown). In other words, the heat source unit 12 is a device that lowers the temperature of the introduced low-temperature fluid FL before discharge and raises the temperature of the introduced high-temperature fluid FH before discharge. Examples of low-temperature fluid FL include chilled or hot water. Examples of high-temperature fluid FH include cooling water or a heat extraction medium. The capacity (or rated output) of the heat source unit 12 should be determined considering the size of the heat load to be processed, and for example, units with predetermined capacities such as 10 kW, 30 kW, or 300 kW can be used. From the viewpoint of ease of controlling the number of units, it is preferable to use heat source units 12 of the same capacity, but units of different capacities may be included. 【0032】 In this embodiment, the piping that forms the fluid flow paths for the fluids entering and leaving each heat source unit 12 includes a group of pipes 13A for the outflowing low-temperature fluid FL, a group of pipes 13B for the inflowing low-temperature fluid FL, a group of pipes 13C for the outflowing high-temperature fluid FH, and a group of pipes 13D for the inflowing high-temperature fluid FH. Each of the pipe groups 13A to 13D is generally configured similarly in this embodiment. Hereafter, when referring to common properties or configurations of each of the pipe groups 13A to 13D, they will simply be collectively referred to as "piping group 13". 【0033】 Figure 2 is a diagram mainly showing the schematic configuration of the piping group 13 of the heat source unit 10. In Figure 2, for the sake of explaining the configuration of the piping group 13, only one piping group 13 is shown, but in reality, as described above, a total of four piping groups 13A to 13D (see Figure 1) are provided. As shown in Figure 2, in this embodiment, one piping group 13 has one manifold pipe 14, two branch pipes 15, and six individual pipes 16. Note that the manifold pipe 14 is considered as one unit regardless of whether it is separable or not. Two branch pipes 15 are connected to the manifold pipe 14 at intervals. Each branch pipe 15 consists of a first branch pipe 15A and a second branch pipe 15B. The ends of the first branch pipe 15A and the second branch pipe 15B are connected by flanges. The other end of the first branch pipe 15A is connected to the manifold pipe 14 by a flange. The other end of the second branch pipe 15B is closed with a closing flange. Each individual pipe 16 has its first end connected to the heat source unit 12 and its second end connected to the branch pipe 15. Two individual pipes 16 are connected to the first branch pipe 15A, and one individual pipe 16 is connected to the second branch pipe 15B. 【0034】 As described above, the piping group 13 can be rearranged in this embodiment to accommodate cases where there are 2 to 6 heat source units 12. For example, if there are 2 heat source units 12, one of the two branch pipes 15 can be removed from the manifold 14 and a closing flange installed, while the second branch pipe 15B can be removed from the remaining branch pipe 15 and a closing flange can be installed. This leaves two individual pipes 16, which can be allocated to the two heat source units 12. If there are 3 heat source units 12, the second branch pipe 15B can be connected to the first branch pipe 15A as in the case of 2 units. If there are 4 heat source units 12, the second branch pipe 15B can be removed from the first branch pipe 15A and two pipes with closing flanges installed can be connected to the manifold 14. If there are five heat source units 12, one of the two branch pipes 15 should be configured by connecting the first branch pipe 15A and the second branch pipe 15B, and the other should be configured by removing the second branch pipe 15B from the first branch pipe 15A and attaching a closing flange. If there are six heat source units 12, as shown in Figure 2, two branch pipes 15, each connected to the first branch pipe 15A and the second branch pipe 15B, should be connected to the manifold pipe 14. 【0035】 The explanation of the heat source unit 10 and the heat source system 1 will continue, again primarily referring to Figure 1. The frame 18 supports each heat source unit 12 and corresponds to the first frame. The frame 18 also supports each piping group 13A to 13D. In this embodiment, the frame 18 is formed as a rectangular parallelepiped, and channel steels positioned at positions corresponding to the 12 sides of the rectangular parallelepiped are joined together by welding or other means to form a single unit. Alternatively, as shown in Figure 2, for example, channel steels may also be placed on the rectangular parallelepiped surface of the frame 18, and both ends may be joined to channel steels positioned at positions corresponding to the sides of the rectangular parallelepiped to improve the strength of the frame 18. Alternatively, channel steels may be provided at positions corresponding to the arrangement of the heat source units 12 and piping groups 13, and the heat source units 12 and piping groups 13 may be fixed to these channel steels. For example, bolt insertion holes can be formed in the flange or web of the channel steel, and the heat source unit 12 can be fixed to the channel steel with bolts passed through these holes, or the piping constituting the piping group 13 can be fixed to the channel steel with U-bolts passed through these holes. In this way, in this embodiment, six heat source units 12 and four piping groups 13 are supported and fixed to a single, integrally constructed frame 18. The frame 18 may be made of a material other than channel steel, taking into consideration the load of the heat source units 12 and piping groups 13 it supports. Furthermore, a distribution board (not shown) or terminal box for supplying power to each heat source unit 12 may be attached to the frame 18. 【0036】 In this embodiment, the heat source unit 10 further includes IO-Link® 60. IO-Link 60 includes an IO-Link master 61 (hereinafter simply referred to as "master 61"), IO-Link devices 62 (hereinafter simply referred to as "device 62"), and a cable 63. In this embodiment, one master 61 is provided in the heat source unit 10 and is mounted on the frame 18. A device 62 is mounted on each heat source unit 12. Therefore, in this embodiment, the heat source unit 10 has six devices 62. Each device 62 is connected to one master 61 by a cable 63. Each device 62 typically transmits values ​​related to the temperature and / or flow rate of the fluid (e.g., low-temperature fluid FL, high-temperature fluid FH, or refrigerant) related to the mounted heat source unit 12 to the master 61 as a digital signal. The master 61 receives signals from each device 62 and provides them to a higher-level control panel (not shown). Alternatively, the master 61 may send signals related to the operation control of the heat source unit 12 to the device 62 to control the operation of the heat source unit 12. The heat source unit 10 is equipped with IO-Link 60, which allows for easy data exchange and configuration of the device 62. 【0037】 In this embodiment, the heat source unit 10 further includes a light-shielding panel 58. The light-shielding panel 58 is a member that blocks light such as sunlight and corresponds to a light-shielding member. Typically, the light-shielding panel 58 is installed to block one or more sides of the rectangular parallelepiped-shaped frame 18 that you want to shield from light, and may be installed on all sides (i.e., all four sides). Typically, perforated metal is used for the light-shielding panel 58, but a plate-shaped member other than metal, such as synthetic resin, with multiple small holes formed therein, or a plate-shaped member without holes may be used. It is preferable that the outer surface of the web of the channel steel on the frame 18 to which the light-shielding panel 58 is attached is oriented to face the light-shielding panel 58. For example, when the light-shielding panel 58 is attached to the outside of the frame 18, it is preferable that the channel steel constituting the frame 18 is arranged so that the outer surface of the web of the channel steel faces outward. The presence of the light-shielding panel 58 allows for the collective protection of each heat source unit 12 and each piping group 13 without the need to rack individual pipes or heat source units 12. Furthermore, when performing maintenance on the heat source units 12 and / or piping groups 13, the heat source units 12 and piping groups 13 can be accessed simply by removing the light-shielding panel 58, which is necessary to enter the inside of the frame 18, making maintenance easier. 【0038】 In this embodiment, the heat source unit 10 further includes a solar panel 59. The solar panel 59 is typically mounted on the top surface of a rectangular frame 18. The solar panel 59 is typically connected via a cable (not shown) to a distribution board that supplies power to the heat source unit 12. The solar panel 59 can also function as a roof for the heat source unit 10. The presence of the solar panel 59 allows for the supply of some or all of the electricity used by the heat source unit 10. 【0039】 The switching unit 20 is a unit that has the function of switching between supplying a lower temperature low-temperature fluid FL to the side where heat load processing is performed (hereinafter referred to as the "secondary side") and supplying a higher temperature high-temperature fluid FH. For example, the switching unit 20 can be a unit that has the function of supplying low-temperature fluid FL to the secondary side when a cooling load exists on the secondary side, and supplying high-temperature fluid FH when the cooling load disappears on the secondary side and a heating load occurs. The switching unit 20 has a low-temperature supply pipe 21 and a low-temperature return pipe 31 through which low-temperature fluid FL flows in principle, and a high-temperature supply pipe 22 and a high-temperature return pipe 32 through which high-temperature fluid FH flows in principle. Here, "in principle" means the state in which the primary use in the design is assumed. In this embodiment, the primary use in the design of the heat source system 1 is set to the state in which low-temperature fluid FL is supplied to the secondary side, and it is also possible to supply high-temperature fluid FH to the secondary side as an alternative use. In this embodiment, the heat source system 1, in principle, supplies the low-temperature fluid FL to the secondary side, while the high-temperature fluid FH is guided to the side where heat is released (hereinafter referred to as the "heat dissipation side"). The heat dissipation side may be configured such that a cooling tower (not shown) is located there to release the heat contained in the high-temperature fluid FH into the atmosphere. When the high-temperature fluid FH is supplied to the secondary side, the low-temperature fluid FL is typically guided to the side where heat is extracted (hereinafter referred to as the "heat extraction side"). The heat extraction side may be configured such that a heat source, such as equipment that discharges heat, is present and provides heat to the low-temperature fluid FL. Hereinafter, the heat dissipation side and the heat extraction side are collectively referred to as the "heat dissipation / extraction side". 【0040】 The low-temperature supply pipe 21 is, in principle, a component that constitutes a flow path that guides the low-temperature fluid FL cooled in the heat source unit 12 from the heat source unit 12 side to the secondary side. In the description of the switching unit 20, unless otherwise specified, "side" refers to the side that is closer in the direction of fluid flow. In the low-temperature supply pipe 21, the end on the heat source unit 12 side is called the low-temperature supply inlet 21A, and the end on the secondary side is called the low-temperature supply outlet 21B. The low-temperature return pipe 31 is, in principle, a component that constitutes a flow path that guides the low-temperature fluid FL used for heat load processing on the secondary side from the secondary side to the heat source unit 12 side. In the low-temperature return pipe 31, the end on the secondary side is called the low-temperature return inlet 31A, and the end on the heat source unit 12 side is called the low-temperature return outlet 31B. The low-temperature supply inlet 21A and low-temperature supply outlet 21B, and the low-temperature return inlet 31A and low-temperature return outlet 31B are typically fitted with pipe connection members such as flanges, so that other pipes can be connected to them. If we consider the low-temperature fluid FL as the first type of fluid, then the low-temperature supply pipe 21 and the low-temperature return pipe 31 correspond to the first piping, the low-temperature supply inlet 21A and the low-temperature return inlet 31A correspond to the first inlet, and the low-temperature supply outlet 21B and the low-temperature return outlet 31B correspond to the first outlet. 【0041】 The high-temperature supply pipe 22 is, in principle, a component that constitutes a flow path that guides the high-temperature fluid FH heated in the heat source unit 12 from the heat source unit 12 side to the heat dissipation / recovery side. In the high-temperature supply pipe 22, the end on the heat source unit 12 side is called the high-temperature supply inlet 22A, and the end on the heat dissipation / recovery side is called the high-temperature supply outlet 22B. The high-temperature return pipe 32 is, in principle, a component that constitutes a flow path that guides the high-temperature fluid FH that has been dissipated on the heat dissipation / recovery side from the heat dissipation / recovery side to the heat source unit 12 side. In the high-temperature return pipe 32, the end on the heat dissipation / recovery side is called the high-temperature return inlet 32A, and the end on the heat source unit 12 side is called the high-temperature return outlet 32B. The high-temperature supply inlet 22A and high-temperature supply outlet 22B, and the high-temperature return inlet 32A and high-temperature return outlet 32B are typically fitted with pipe connection members such as flanges, so that other pipes can be connected to them. If we consider the high-temperature fluid FH as a second type of fluid, then the high-temperature supply pipe 22 and the high-temperature return pipe 32 correspond to a second piping system, the high-temperature supply inlet 22A and the high-temperature return inlet 32A correspond to a second inlet, and the high-temperature supply outlet 22B and the high-temperature return outlet 32B correspond to a second outlet. 【0042】 The low-temperature supply pipe 21 and the high-temperature supply pipe 22 are connected by a low-high supply switching pipe 23 and a high-low supply switching pipe 25. The high-low supply switching pipe 25 is connected to the low-temperature supply pipe 21 downstream of the low-high supply switching pipe 23, and to the high-temperature supply pipe 22 upstream of the low-high supply switching pipe 23. In this embodiment, a three-way valve 24 is provided at the connection point between the high-temperature supply pipe 22 and the low-high supply switching pipe 23, and a three-way valve 26 is provided at the connection point between the low-temperature supply pipe 21 and the high-low supply switching pipe 25. By appropriately switching the two three-way valves 24 and 26, it is possible to switch between allowing the low-temperature fluid FL to flow out from the low-temperature supply outlet 21B while allowing the high-temperature fluid FH to flow out from the high-temperature supply outlet 22B, and allowing the high-temperature fluid FH to flow out from the low-temperature supply outlet 21B while allowing the low-temperature fluid FL to flow out from the high-temperature supply outlet 22B. The three-way valve 24 may be installed at the connection point between the low-temperature supply pipe 21 and the low-high supply switching pipe 23, and the three-way valve 26 may be installed at the connection point between the high-temperature supply pipe 22 and the high-low supply switching pipe 25. Alternatively, two two-way valves may be installed instead of the three-way valve 24. In this case, one may be installed in the low-high supply switching pipe 23, and the other in the low-temperature supply pipe 21 or high-temperature supply pipe 22 between the connection point of the low-high supply switching pipe 23 and the connection point of the high-low supply switching pipe 25. Alternatively, two two-way valves may be installed instead of the three-way valve 26. In this case, one may be installed in the high-low supply switching pipe 25, and the other in the low-temperature supply pipe 21 or high-temperature supply pipe 22 between the connection point of the low-high supply switching pipe 23 and the connection point of the high-low supply switching pipe 25. The low-high supply switching pipe 23 and the high-low supply switching pipe 25 correspond to switching piping, respectively. 【0043】 The low-temperature return pipe 31 and the high-temperature return pipe 32 are connected by a low-to-high return switching pipe 33 and a high-to-low return switching pipe 35. The high-to-low return switching pipe 35 is connected to the low-temperature return pipe 31 downstream of the low-to-high return switching pipe 33, and to the high-temperature return pipe 32 upstream of the low-to-high return switching pipe 33. In this embodiment, a three-way valve 34 is provided at the connection between the high-temperature return pipe 32 and the low-to-high return switching pipe 33, and a three-way valve 36 is provided at the connection between the low-temperature return pipe 31 and the high-to-low return switching pipe 35. By appropriately switching between the two three-way valves 34 and 36, it is possible to switch between two configurations: one in which the low-temperature fluid FL flows in from the low-temperature return inlet 31A and flows out from the low-temperature return outlet 31B while the high-temperature fluid FH flows in from the high-temperature return inlet 32A and flows out from the high-temperature return outlet 32B; and the other in which the high-temperature fluid FH flows in from the low-temperature return inlet 31A and flows out from the high-temperature return outlet 32B while the low-temperature fluid FL flows in from the high-temperature return inlet 32A and flows out from the low-temperature return outlet 31B. Note that the three-way valve 34 may be provided at the connection point between the low-temperature return pipe 31 and the low-high return switching pipe 33, and the three-way valve 36 may be provided at the connection point between the high-temperature return pipe 32 and the high-low return switching pipe 35. Alternatively, two two-way valves may be provided instead of the three-way valve 34. In this case, one should be provided in the low-high return switching pipe 33, and the other should be provided in the low-temperature return pipe 31 or high-temperature return pipe 32 between the connection point of the low-high return switching pipe 33 and the connection point of the high-low return switching pipe 35. Alternatively, two two-way valves may be installed instead of the three-way valve 36. In this case, one valve may be installed in the high / low return switching pipe 35, and the other in the low-temperature return pipe 31 or high-temperature return pipe 32 between the connection point of the low / high return switching pipe 33 and the connection point of the high / low return switching pipe 35. The low / high return switching pipe 33 and the high / low return switching pipe 35 also correspond to switching piping. 【0044】 The switching unit 20 further has a support frame 28. The support frame 28 supports the pipes 21, 22, 23, 25, 31, 32, 33, and 35, each having a three-way valve 24, 26, 34, and 36, and corresponds to a second support frame. The support frame 28 is typically formed in a rectangular parallelepiped shape as a whole, similar to the support frame 18 of the heat source unit 10, and is integrally constructed by joining channel steel sections, which are positioned at locations corresponding to the 12 sides of the rectangular parallelepiped, to each other by welding or the like. In addition, channel steel sections may be placed on the rectangular parallelepiped surface of the support frame 28 and joined at both ends to channel steel sections positioned at locations corresponding to the sides of the rectangular parallelepiped, thereby improving the strength of the support frame 28. Furthermore, channel steel sections may be provided at locations corresponding to the positions where support and fixing are required among the pipes 21, 22, 23, 25, 31, 32, 33, and 35, and the pipes may be fixed to these channel steel sections. For example, U-bolts can be used to fix the pipes to the channel steel sections. In this way, in this embodiment, the pipes 21, 22, 23, 25, 31, 32, 33, and 35, each having a three-way valve 24, 26, 34, and 36, are supported and fixed to a single, integrally constructed frame 28. The frame 28 may be constructed from a material other than channel steel, taking into consideration the load of the supported pipes and the like. 【0045】 In this embodiment, the switching unit 20 is further equipped with an IO-Link 60. In this embodiment, the switching unit 20 is provided with one master 61 which is mounted on the frame 28, and four devices 62 are mounted separately on each of the three-way valves 24, 26, 34, and 36. Each device 62 is connected to the master 61 by a cable 63. Typically, each device 62 controls the flow path of each of the three-way valves 24, 26, 34, and 36, and transmits information about the valve's state, such as the number of flow path switching operations, and information about any abnormalities, such as wire breaks, as digital signals to the master 61. The master 61 receives signals from each device 62 and provides them to a higher-level control panel (not shown). Because the switching unit 20 is equipped with an IO-Link 60, it can obtain information about the operating state and abnormalities of each of the three-way valves 24, 26, 34, and 36, as well as flow path control. 【0046】 In this embodiment, the switching unit 20 further includes a shading panel 58 and a solar panel 59. The shading panel 58 and solar panel 59 in the switching unit 20 are typically the same as those used in the heat source unit 10, but may be different. In the switching unit 20, the shading panel 58 is typically installed to block one or more sides of the rectangular frame 28 that you want to shade, and may be installed on all sides (i.e., all four sides). The installation procedure for the shading panel 58 in the switching unit 20 may be the same as for the shading panel 58 in the heat source unit 10. Also in the switching unit 20, the solar panel 59 is typically mounted on the top surface of the rectangular frame 28. The solar panel 59 is typically connected via a cable (not shown) to a distribution board that supplies power to each of the three-way valves 24, 26, 34, and 36. 【0047】 The frame 18 of the heat source unit 10 and the frame 28 of the switching unit 20 may be formed to the same size. If both frames 18 and 28 are formed to the same size, the manufacturing process can be standardized and production efficiency can be improved. Furthermore, it is preferable to form the frames 18 and 28 to a size that can be transported by vehicle and / or accommodated in an elevator installed in the building at the installation site, as this allows for efficient transport to the installation site. Considering such transport efficiency, the frames 18 and 28 may be rectangular parallelepipeds, for example, with a maximum side length of about 2100 mm. In addition, a rod-shaped member (not shown) with a length corresponding to the width of the wiring rack 53 may be attached to at least one of each frame 18 and 28 so as to extend outward. The rod-shaped member (not shown) is preferably provided on the faces of the two frames 18 and 28 that face each other, so as to extend toward the other frame 18 or 28. In this way, by simply positioning the frames 18 and 28 of adjacent units 10 and 20 against the ends of the rod-shaped members (not shown), each unit 10 and 20 can be installed at a distance equivalent to the width of the wiring rack 53. 【0048】 The heat source unit 10 and the switching unit 20 are typically assembled in a factory and transported by vehicle in units of 10 and 20, and then delivered to the site where the heat source system 1 is to be installed. By assembling the heat source unit 10 and the switching unit 20 in a factory, processing and assembly are carried out in a location with a well-equipped work environment and facilities, allowing for a higher level of processing accuracy and quality than if processing and assembly were carried out on-site. Furthermore, since the heat source unit 10 and the switching unit 20 are delivered to the site in their respective units, the construction of each unit 10 and 20 is completed simply by installing them, thus shortening the construction period. In this embodiment, the heat source unit 10 and the switching unit 20 are arranged at a distance equal to the width of the wiring rack 53. 【0049】 The connecting pipe 40 is a pipe that constitutes a flow path connecting the flow path of the heat source unit 10 and the flow path of the switching unit 20. The connecting pipe 40 is typically processed (e.g., cut to a predetermined length and form of a connection) and assembled on-site, but the processing may be done at a location other than the site (e.g., a factory), and only the assembly may be done on-site. In this embodiment, the connecting pipe 40 includes four pipes: a first connecting pipe 41, a second connecting pipe 42, a third connecting pipe 43, and a fourth connecting pipe 44. The first connecting pipe 41 is a pipe that connects the group of pipes 13A that carries the low-temperature fluid FL discharged from each heat source unit 12 to the low-temperature supply pipe 21. The second connecting pipe 42 is a pipe that connects the group of pipes 13C that carries the high-temperature fluid FH discharged from each heat source unit 12 to the high-temperature supply pipe 22. The third connecting pipe 43 is a pipe that connects the low-temperature return pipe 31 to the group of pipes 13B that carries the low-temperature fluid FL flowing into each heat source unit 12. The fourth connecting pipe 44 is a pipe that connects the high-temperature return pipe 32 to the group of pipes 13D that carry the high-temperature fluid FH flowing into each heat source unit 12. In this embodiment, a low-temperature fluid pump 45 is provided in the third connecting pipe 43, and a high-temperature fluid pump 46 is provided in the fourth connecting pipe 44. The low-temperature fluid pump 45 is a pump that flows the low-temperature fluid FL, and the high-temperature fluid pump 46 is a pump that flows the high-temperature fluid FH. Typically, the low-temperature fluid pump 45 and the high-temperature fluid pump 46 are controlled to start and stop by commands from a control panel (not shown), and flow rate control may also be performed. 【0050】 In this embodiment, the wiring rack 53 can be supported by the frame 18 of the heat source unit 10 and the frame 28 of the switching unit 20. The wiring rack 53 is typically mounted on the upper side of the frames 18 and 28 so that maintenance workers can easily walk underneath it. Cables for power supply to each heat source unit 12 and each three-way valve 24, 26, 34, and 36 can be laid on the wiring rack 53. Cables connecting each master 61 to a higher-level control panel (not shown) can also be laid on the wiring rack 53. Other cables may also be laid on the wiring rack 53. 【0051】 External piping is connected to the heat source system 1, which provides fluid connections to the secondary side and the heat exchange side. The external piping is located outside the heat source system 1. Typically, external piping 91, which generally guides the low-temperature fluid FL, whose temperature has decreased, to the secondary side, is connected to the low-temperature supply outlet 21B of the low-temperature supply pipe 21. Also, external piping 92, which generally guides the high-temperature fluid FH, whose temperature has increased, to the heat exchange side, is connected to the high-temperature supply outlet 22B of the high-temperature supply pipe 22. Furthermore, external piping 93, which generally guides the low-temperature fluid FL, after heat has been utilized on the secondary side, to the low-temperature return pipe 31, is connected to the low-temperature return inlet 31A. Also, external piping 94, which generally guides the high-temperature fluid FH, after heat exchange has occurred on the heat exchange side, to the high-temperature return pipe 32, is connected to the high-temperature return inlet 32A. 【0052】 The heat source system 1 configured as described above operates as follows. First, the case where a cooling load exists on the secondary side is explained. In this case, each of the three-way valves 24, 26, 34, and 36 is controlled by a command from the control panel (not shown) via the master 61 to prevent the low-temperature fluid FL from flowing into the low-high supply switching pipe 23 and the low-high return switching pipe 33, and to prevent the high-temperature fluid FH from flowing into the high-low supply switching pipe 25 and the high-low return switching pipe 35. Once the flow path settings for each of the three-way valves 24, 26, 34, and 36 are set, the low-temperature fluid pump 45 and the high-temperature fluid pump 46 are started. Then, each of the heat source units 12 is started by a command from the control panel (not shown) via the master 61. The equipment on the heat dissipation / recovery side (typically a cooling tower) is also started. 【0053】 When each device is started, in the low-temperature fluid FL system, the low-temperature fluid FL that flows into each heat source unit 12 cools down and flows out of each heat source unit 12. The low-temperature fluid FL that flows out of each heat source unit 12 is supplied to the secondary side via the piping group 13A, the first connecting pipe 41, the low-temperature supply pipe 21, and the external piping 91. The low-temperature fluid FL supplied to the secondary side is used to process the cooling load, its temperature rises, and it flows towards the heat source unit system 1. The low-temperature fluid FL that has come towards the heat source unit system 1 flows into the low-temperature return pipe 31 from the external piping 93, and then flows into each heat source unit 12 via the third connecting pipe 43 and the piping group 13B, and thereafter the above process is repeated. 【0054】 On the other hand, in the high-temperature fluid FH system, the high-temperature fluid FH that flows into each heat source unit 12 increases in temperature and flows out of each heat source unit 12. The high-temperature fluid FH that flows out of each heat source unit 12 is guided to the heat dissipation / recovery side via the piping group 13C, the second connecting pipe 42, the high-temperature supply pipe 22, and the external piping 92. The high-temperature fluid FH guided to the heat dissipation / recovery side typically releases its contained heat into the atmosphere, causing its temperature to decrease, and flows towards the heat source unit system 1. The high-temperature fluid FH that has come towards the heat source unit system 1 flows into the high-temperature return pipe 32 from the external piping 94, and then flows into each heat source unit 12 via the fourth connecting pipe 44 and the piping group 13D, and thereafter repeats the above process. 【0055】 Next, we will explain the case where a heating load exists on the secondary side. In this case, each of the three-way valves 24, 26, 34, and 36 is controlled as follows by a command from the control panel (not shown) via the master 61. Three-way valve 24 is configured so that low-temperature fluid FL flows from the low-high supply switching pipe 23 to the high-temperature supply pipe 22 on the high-supply outlet 22B side, and high-temperature fluid FH does not flow in from the high-supply inlet 22A side. Three-way valve 26 is configured so that high-temperature fluid FH flows from the high-low supply switching pipe 25 to the low-temperature supply pipe 21 on the low-supply outlet 21B side, and low-temperature fluid FL does not flow in from the low-supply inlet 21A side. Three-way valve 34 is configured so that high-temperature fluid FH flows from the low-high return switching pipe 33 to the high-temperature return pipe 32 on the high-return outlet 32B side, and low-temperature fluid FL does not flow in from the high-return inlet 32A side. The three-way valve 36 is configured such that low-temperature fluid FL flows from the high / low return switching pipe 35 to the low-temperature return pipe 31 on the low-temperature return outlet 31B side, and high-temperature fluid FH does not flow in from the low-temperature return inlet 31A side. Once the flow path settings for each of the three-way valves 24, 26, 34, and 36 are complete, the low-temperature fluid pump 45 and the high-temperature fluid pump 46 are started. Subsequently, each heat source unit 12 is started by a command sent via the master 61 from the control panel (not shown). In addition, if necessary, equipment on the heat dissipation / recovery side (e.g., heating device) is also started. 【0056】 When each device is started, the high-temperature fluid FH that flows into each heat source unit 12 increases in temperature and flows out of each heat source unit 12. The high-temperature fluid FH that flows out of each heat source unit 12 is supplied to the secondary side via the piping group 13C, the second connecting pipe 42, the high-temperature supply pipe 22, the high / low supply switching pipe 25, the low-temperature supply pipe 21, and the external piping 91. The high-temperature fluid FH supplied to the secondary side is used to process the heating load, its temperature decreases, and it flows towards the heat source unit system 1. The high-temperature fluid FH that has come towards the heat source unit system 1 flows into the low-temperature return pipe 31 from the external piping 93, and then flows into each heat source unit 12 via the low / high return switching pipe 33, the high-temperature return pipe 32, the fourth connecting pipe 44, and the piping group 13D, and thereafter the above process is repeated. 【0057】 On the other hand, the low-temperature fluid FL that flows into each heat source unit 12 cools down and flows out of each heat source unit 12. The low-temperature fluid FL that flows out of each heat source unit 12 is guided to the heat dissipation / recovery side via the piping group 13A, the first connecting pipe 41, the low-temperature supply pipe 21, the low-high supply switching pipe 23, the high-temperature supply pipe 22, and the external piping 92. The low-temperature fluid FL guided to the heat dissipation / recovery side gains heat from the heat source (e.g., the waste heat source), its temperature rises, and it flows towards the heat source unit system 1. The low-temperature fluid FL that has come towards the heat source unit system 1 flows into the high-temperature return pipe 32 from the external piping 94, and then flows into each heat source unit 12 via the high-low return switching pipe 35, the low-temperature return pipe 31, the third connecting pipe 43, and the piping group 13B, and thereafter the above process is repeated. 【0058】 As described above, the heat source unit system 1 according to this embodiment is constructed by installing the factory-manufactured heat source unit 10 and switching unit 20 on-site and connecting them with connecting pipes 40, thus enabling a high-quality heat source unit system 1 to be produced in a relatively short construction period. Furthermore, because it is equipped with a switching unit 20, it is possible to switch between cooling and heating operations in a timely manner without changing the configuration of the heat source unit 10. In addition, if the frame 18 that constitutes the outer edge of the heat source unit 10 and the frame 28 that constitutes the outer edge of the switching unit 20 are formed to the same size, production efficiency and transport efficiency can be improved. Furthermore, since the heat source unit 10 and the switching unit 20 are installed on-site with a distance equal to the width of the wiring rack 53, the wiring rack 53 can be installed neatly. In addition, since light-shielding panels 58 are attached to the frames 18 and 28, the equipment and piping located inside the frames 18 and 28 can be easily protected, and the equipment and piping can be accessed simply by removing the necessary light-shielding panels 58, making maintenance easy. Furthermore, since solar panels 59 are attached to the mounting frames 18 and 28, it becomes possible to supply some or all of the power used by the heat source unit 10 and the switching unit 20. In addition, because it is equipped with IO-Link 60, the communication lines for each unit 10 and 20 can be consolidated, and the number of communication lines connecting to the higher-level control panel (not shown) is relatively small. 【0059】 In the above explanation, it was assumed that the heat source system 1 is equipped with a wiring rack 53, but it is not necessary for the system to be equipped with a wiring rack 53. 【0060】 In the above description, the heat source unit 10 and the switching unit 20 are assumed to be equipped with an IO-Link 60, a light-shielding panel 58, and a solar panel 59, respectively. However, these are optional configurations, and one or more of these components may not be provided. Alternatively, a general-purpose control device may be provided instead of the IO-Link 60, and this control device may control each heat source unit 12, each three-way valve 24, 26, 34, 36, the low-temperature fluid pump 45, and the high-temperature fluid pump 46. 【0061】 In the above description, it was assumed that the low-temperature fluid pump 45 is provided in the third connecting pipe 43 and the high-temperature fluid pump 46 is provided in the fourth connecting pipe 44. However, the low-temperature fluid pump 45 may be provided in the piping group 13 of the low-temperature fluid FL system as a component of the heat source unit 10, or it may be provided in the piping of the low-temperature fluid FL system (for example, the low-temperature return pipe 31 near the low-temperature return outlet 31B) as a component of the switching unit 20. Similarly, the high-temperature fluid pump 46 may be provided in the piping group 13 of the high-temperature fluid FH system as a component of the heat source unit 10, or it may be provided in the piping of the high-temperature fluid FH system (for example, the high-temperature return pipe 32 near the high-temperature return outlet 32B) as a component of the switching unit 20. Alternatively, the low-temperature fluid pump 45 and the high-temperature fluid pump 46 may be supported on a common frame separate from the frames 18 and 28 to constitute a pump unit. 【0062】 In the above explanation, it was assumed that the heat dissipation of the high-temperature fluid FH when there is a cooling load is carried out by a cooling tower to the atmosphere. However, it may also be carried out by heat exchange with unused heat such as river water, seawater, or underground, and the cooling tower may be used only when the heat balance is not achieved by prioritizing heat exchange with unused heat. Furthermore, it was assumed that the heat extraction of the low-temperature fluid FL when there is a heating load is carried out from a heat source (e.g., a waste heat source). However, the heat source may include unused heat such as geothermal energy, and waste heat may include waste heat. 【0063】 In the above explanation, it was assumed that the low-temperature fluid FL and high-temperature fluid FH discharged from each heat source unit 12 are guided to the secondary side and the heat dissipation / recovery side. However, a heat exchanger may be provided to prevent the fluids flowing into and out of each heat source unit 12 from mixing with the fluids flowing into and out of the secondary side and the heat dissipation / recovery side. Figure 3 is a schematic diagram showing the general configuration of a heat source system 1A according to a modified embodiment of one embodiment of the present disclosure. In addition to the configuration of the heat source system 1 (see Figure 1), the heat source system 1A includes a heat exchange unit 70. In the following description of the heat source system 1A, when referring to the configuration of the heat source system 1 (see Figure 1), refer to Figures 1 and 2 as appropriate. 【0064】 The heat exchange unit 70 includes a first heat exchanger 71 and a second heat exchanger 72. The first heat exchanger 71 is a device that performs heat exchange between the secondary side fluid FS and the low-temperature fluid FL or high-temperature fluid FH, and corresponds to the first heat exchanger. The secondary side fluid FS is a medium that transports the cold or hot energy supplied to the secondary side, and is typically water, but antifreeze may also be used. Whether the low-temperature fluid FL or the high-temperature fluid FH flows into the first heat exchanger 71 depends on whether fluid flows through the switching pipe in the switching unit 20, in other words, whether there is a cooling load or a heating load on the secondary side. The second heat exchanger 72 is a device that performs heat exchange between the heat-releasing fluid FT and the high-temperature fluid FH or low-temperature fluid FL, and corresponds to the second heat exchanger. The heat-releasing fluid FT is a medium that transports the heat released on the heat-releasing side or the heat collected on the heat-collecting side, and is typically water. The second heat exchanger 72 receives the high-temperature fluid FH and the low-temperature fluid FL that does not flow into the first heat exchanger 71. While plate heat exchangers are typically used for both the first heat exchanger 71 and the second heat exchanger 72, one or both may be other types of heat exchangers, such as shell-and-tube heat exchangers. 【0065】 In the first heat exchanger 71, the secondary supply pipe 121 is connected to the outlet of the secondary fluid FS, and the secondary return pipe 131 is connected to the inlet. Connecting pipe 141 is connected to the inlet of the low-temperature fluid FL or high-temperature fluid FH, and connecting pipe 143 is connected to the outlet. The other ends of the secondary supply pipe 121 and the secondary return pipe 131, and the connecting pipes 141 and 143 are typically fitted with pipe connecting members such as flanges, allowing for the connection of other pipes. In the second heat exchanger 72, the heat dissipation supply pipe 122 is connected to the outlet of the heat dissipation fluid FT, and the heat dissipation return pipe 132 is connected to the inlet. Connecting pipe 142 is connected to the inlet of the high-temperature fluid FH or low-temperature fluid FL, and connecting pipe 144 is connected to the outlet. The other ends of the heat dissipation supply pipe 122 and the heat dissipation return pipe 132, as well as the connecting pipes 142 and 144, are typically fitted with pipe connecting members such as flanges, allowing for the connection of other pipes. 【0066】 The heat dissipation supply pipe 122 is equipped with a thermometer 73 for detecting the temperature of the heat dissipation fluid FT flowing inside, and a flow meter 76 for detecting the flow rate. The flow meter 76 may be an ultrasonic flow meter. The heat dissipation return pipe 132 is equipped with a thermometer 74 for detecting the temperature of the heat dissipation fluid FT flowing inside. The product of the difference between the temperature detected by thermometer 73 and the temperature detected by thermometer 74 (i.e., the inlet / outlet temperature difference of the heat dissipation fluid FT relative to the second heat exchanger 72) and the flow rate detected by flow meter 76 (i.e., the "inlet / outlet temperature difference" × "flow rate" of the heat dissipation fluid FT relative to the second heat exchanger 72) indicates the amount of heat exchanged between the heat dissipation fluid FT and the low-temperature fluid FL or high-temperature fluid FH in the second heat exchanger 72. Therefore, both thermometers 73, 74 and flow meter 76 correspond to the heat exchange amount detection unit. The heat dissipation supply pipe 122 and the heat dissipation return pipe 132 are fitted with differential pressure gauges 75 for detecting the difference in internal pressure. The differential pressure gauge 75 detects the difference between the pressure of the heat-releasing fluid FT flowing into the second heat exchanger 72 and the pressure of the heat-releasing fluid FT flowing out of the second heat exchanger 72, and corresponds to the pressure difference detection unit. The differential pressure gauge 75 may be a digital differential pressure gauge. 【0067】 The heat exchange unit 70 further includes a frame 78. The frame 78 supports the first heat exchanger 71, the second heat exchanger 72, the secondary supply pipe 121, the secondary return pipe 131, the heat dissipation supply pipe 122, and the heat dissipation return pipe 132, and corresponds to a third frame. Typically, the frame 78 is formed in a rectangular parallelepiped shape as a whole, similar to the frame 18 of the heat source unit 10, and channel steel sections are arranged at positions corresponding to the 12 sides of the rectangular parallelepiped and joined together by welding or other means to form a single unit. In addition, channel steel sections may also be placed on the rectangular parallelepiped surface of the frame 78, and both ends of these sections may be joined to channel steel sections arranged at positions corresponding to the sides of the rectangular parallelepiped to improve the strength of the frame 78. Furthermore, the frame 78 may be the same size as the frame 18 of the heat source unit 10 and / or the frame 28 of the switching unit 20. 【0068】 In this modified example, the heat exchange unit 70 is further equipped with an IO-Link 60. In this modified example, the heat exchange unit 70 is provided with one master 61 mounted on a frame 78, and four devices 62 are attached to thermometers 73, 74, differential pressure gauge 75, and flow meter 76, respectively. Each device 62 is connected to the master 61 by a cable 63. Each device 62 transmits the value detected by the attached thermometers 73, 74, differential pressure gauge 75, or flow meter 76 as a digital signal to the master 61. The master 61 receives signals from each device 62 and provides them to a higher-level control panel (not shown). The higher-level control panel (not shown) may have a program pre-stored that estimates the degree of fouling of the heat-extracting fluid FT and estimates the timing of maintenance inspections, and may estimate the timing of maintenance inspections based on the received detected value signals. As an index for estimating the degree of fouling of the heat-releasing fluid FT, the value obtained by dividing the amount of heat exchanged by the heat-releasing fluid FT in the second heat exchanger 72 by the pressure difference of the heat-releasing fluid FT flowing into and out of the second heat exchanger 72 (i.e., "exchanged heat amount" / "pressure difference") of the heat-releasing fluid FT may be used. Hereinafter, "exchanged heat amount" / "pressure difference" will be referred to as the "fouling coefficient". The more fouled the flow path of the heat-releasing fluid FT in the second heat exchanger 72, the smaller the amount of heat exchanged and the greater the pressure loss (i.e., the larger the pressure difference), so the fouling coefficient becomes smaller. By estimating the degree of fouling of the heat-releasing fluid FT using the fouling coefficient, it becomes possible to make an estimate that is closer to the actual degree of fouling even when the type of heat-releasing fluid FT changes, compared to estimating the degree of fouling using only the "pressure difference". Note that when estimating the degree of fouling of the heat-releasing fluid FT, the fouling coefficient may be used alone, or a value obtained by multiplying the fouling coefficient by other coefficients and / or adding them may be used. Furthermore, the standard value for the fouling coefficient that recommends cleaning and other maintenance inspections (i.e., the value below which maintenance inspections are recommended) may be determined after operating the heat source system 1A for a predetermined period, confirming the degree of fouling of the second heat exchanger 72, and based on the values ​​detected by the thermometers 73 and 74, the flow meter 76, and the differential pressure gauge 75 that have been periodically recorded up to that point. Alternatively, the standard value for the fouling coefficient may be determined based on data obtained by operating a test machine.By storing the reference value of the fouling coefficient determined in this way in a higher-level control panel (not shown), the degree of fouling in the flow path of the heat-releasing fluid FT can be determined. Alternatively, the master 61 may be programmed to estimate the degree of fouling in the heat-releasing fluid FT and estimate the timing of maintenance inspections, as well as the reference value of the fouling coefficient, and the master 61 may determine the degree of fouling in the flow path of the heat-releasing fluid FT. Thus, the higher-level control panel (not shown) or the master 61 can correspond to the determination unit. In addition, a general-purpose control device may be provided instead of IO-Link 60, and the timing of maintenance inspections may be estimated by this control device. Furthermore, the above procedure for estimating the degree of fouling in the flow path of the heat-releasing fluid FT in the second heat exchanger 72 may be applied to estimating the degree of fouling in the flow path of the secondary fluid FS in the first heat exchanger 71. 【0069】 In this modified example, the heat exchange unit 70 further includes a shading panel 58 and a solar panel 59. The shading panel 58 and solar panel 59 in the heat exchange unit 70 are typically the same as those used in the heat source unit 10 and the switching unit 20, but may be different. In the heat exchange unit 70, the shading panel 58 is typically installed to block one or more sides of the rectangular frame 78 that you want to shade, and may be installed on all sides (i.e., all four sides). The installation procedure for the shading panel 58 in the heat exchange unit 70 may be the same as for the shading panel 58 in the heat source unit 10 and the switching unit 20. Also in the heat exchange unit 70, the solar panel 59 is typically mounted on the top surface of the rectangular frame 78. The solar panel 59 is typically connected via a cable (not shown) to a distribution board that supplies power to the components of the heat source system 1A. 【0070】 The heat exchange unit 70 is typically assembled in a factory, similar to the heat source unit 10 and the switching unit 20, transported by vehicle, and delivered to the site where the heat source system 1A will be installed. Once the heat exchange unit 70 is delivered to the site and installed, its flow path is connected to the switching unit 20 by intermediate pipes 81, 82, 83, and 84. In the heat source system 1A, the external pipes 91, 92, 93, and 94 are connected to the heat exchange unit 70, not the switching unit 20. The connecting pipe 141 of the heat exchange unit 70 is connected to the low supply outlet 21B of the low-temperature supply pipe 21 of the switching unit 20 by intermediate pipe 81. The connecting pipe 142 is connected to the high supply outlet 22B by intermediate pipe 82. The connecting pipe 143 is connected to the low return inlet 31A by intermediate pipe 83. The connecting pipe 144 is connected to the high return inlet 32A by intermediate pipe 84. Intermediate pipes 81 and 83 connect the low-temperature supply pipe 21 and low-temperature return pipe 31 to the first heat exchanger 71 and correspond to the first intermediate pipes. Intermediate pipes 82 and 84 connect the high-temperature supply pipe 22 and high-temperature return pipe 32 to the second heat exchanger 72 and correspond to the second intermediate pipes. 【0071】 In the heat source system 1A, external piping that fluidizes the secondary side and the heat dissipation / recovery side is connected to the heat exchange unit 70 as described above. Typically, external piping 91 that guides the secondary side fluid FS to the secondary side is connected to the secondary side supply pipe 121. External piping 92 that guides the heat dissipation / recovery fluid FT to the heat dissipation / recovery side is connected to the heat dissipation / recovery supply pipe 122. External piping 93 that carries the incoming secondary side fluid FS is connected to the secondary side return pipe 131. External piping 94 that carries the incoming heat dissipation / recovery fluid FT is connected to the heat dissipation / recovery return pipe 132. The heat source system 1A configured as described above allows for the construction of a high-quality system in a relatively short construction period, and since the heat dissipation / recovery fluid FT does not flow into each heat source unit 12, the reduction in the capacity of each heat source unit 12 can be reduced. Furthermore, especially in large-scale or complex systems, by connecting piping from the site to the first heat exchanger 71 and the second heat exchanger 72, and creating a closed flow path between each heat exchanger 71, 72 and the heat source unit 10, complex control and piping can be completed on the unit side, eliminating the need to consider on-site conditions such as piping pressure and water volume. 【0072】 In the above description of the heat source system 1A, it was assumed that the heat exchange unit 70 is equipped with a light-shielding panel 58 and a solar panel 59, but these are optional configurations, and it is not necessary to have either one or both. Also, although omitted in the above description of the heat source system 1A, a pump for flowing the secondary fluid FS and / or a pump for flowing the heat-releasing fluid FT may be included in the heat exchange unit 70 (i.e., supported by the frame 78). Furthermore, although the heat exchange unit 70 is assumed to have a first heat exchanger 71 and a second heat exchanger 72, the first heat exchanger 71 may be omitted if the secondary fluid FS is not contaminated or if the contamination is within an acceptable range. [Explanation of Symbols] 【0073】 1. 1A Heat Source System 10 Heat source unit 12 Heat source machine 18. Stand (First Stand) 20 Switching Units 21 Low-temperature supply pipe (first piping) 22 High-temperature supply pipe (second piping) 23. Low / High Supply Switching Pipe (Switching Piping) 25 High / low forward switching pipe (switching pipe) 28. Mounting frame (second mounting frame) 31. Low-temperature return pipe (first piping) 32. High-temperature return pipe (second piping) 33. Low / High Return Switching Pipe (Switching Piping) 35. High / Low Return Switching Pipe (Switching Piping) 40 connecting pipes 53 Wiring Rack 58 Light-blocking panels 59 Solar panels 60 IO-Link 61 IO-Link Master 62 IO-Link devices 70 Heat exchange unit 71. First heat exchanger (first heat exchanger) 72. Second heat exchanger (second heat exchanger) 73, 74 thermometer 76 Flow meter 75 Differential pressure gauge 78. Mounting structure (third mounting structure) 81, 83 Intermediate piping (First intermediate piping) 82, 84 Relay piping (second relay piping) 121 Secondary side outbound pipe 122 Heat radiation outbound pipe 131 Secondary return pipe 132 Heat extraction and return pipe FS Secondary fluid FT Heat extraction fluid FL (Fluid-free fluid) (Type 1 fluid) FH High-temperature fluid (second type of fluid)

Claims

[Claim 1] A heat source unit that performs at least one of cooling and heating of a first fluid, A heat exchanger that causes heat exchange to occur between the first fluid and the second fluid, A heat exchange amount detection unit for detecting the amount of heat exchanged between the first fluid and the second fluid, A pressure difference detection unit for detecting the difference between the pressure of the second fluid flowing into the heat exchanger and the pressure of the second fluid flowing out of the heat exchanger, The system includes a determination unit that determines the degree of contamination of the second fluid based on a value obtained by dividing the amount of heat exchanged detected by the heat exchange detection unit by the pressure difference detected by the pressure difference detection unit. Heat source system. [Claim 2] The determination unit recommends maintenance and inspection if the fouling coefficient, which is the value obtained by dividing the amount of heat exchanged detected by the heat exchange detection unit by the pressure difference detected by the pressure difference detection unit, falls below a predetermined standard value. The heat source system according to claim 1. [Claim 3] The IO-Link® device provided in the heat exchange detection unit and the pressure difference detection unit, The system comprises at least one IO-Link master that receives signals from a plurality of the aforementioned IO-Link devices, The heat source system according to claim 1. [Claim 4] Having multiple of the aforementioned heat source units, The frame comprises a support structure for multiple heat source units, A heat source system according to any one of claims 1 to 3.

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