Cold energy power generation system and heat exchange assembly

Abstract

The utility model discloses a cold energy power generation system and a heat exchange assembly, and belongs to the technical field of cold energy power generation. The cold energy power generation system comprises a working medium assembly, a power generation assembly, a lubricating oil assembly and a heat exchange assembly. The working medium assembly comprises a working medium pump, an evaporator, an expansion machine and a condenser which are sequentially connected in series. The condenser and the working medium pump are connected to form a working medium loop. The power generation assembly is connected with the expansion machine which can drive the power generation assembly to generate power. The lubricating oil assembly is connected with the expansion machine and the power generation assembly to form a lubricating oil loop for cooling the expansion machine and the power generation assembly; the heat exchange assembly comprises a working medium pipe and a lubricating oil pipe which are adjacently arranged, the working medium pipe communicates with the working medium loop, the lubricating oil pipe communicates with the lubricating oil loop, and the heat exchange assembly is used for transferring heat in lubricating oil into a working medium. The heat in the lubricating oil is recovered and supplied to the working medium, so that the power generation capacity and the power generation efficiency are improved, and meanwhile, the lubricating oil is cooled.

Description

Technical Field

[0001] The present application belongs to the field of cold energy power generation technology, and specifically relates to a cold energy power generation system and a heat exchange component. Background Art

[0002] With the rapid development of the LNG (liquefied natural gas) industry and the air separation industry, the utilization of cold energy in LNG receiving stations and air separation units has attracted more and more attention. Among them, cold energy power generation is a more suitable utilization method. At the same time, there are a large number of mechanical rotating equipment in the production processes of LNG receiving stations, LNG filling stations, LNG satellite stations, air separation units, etc., most of which use lubricating oil systems for lubrication and cooling.

[0003] However, the temperature rise caused by lubricating oil cooling cannot be effectively utilized, and lubricating oil cooling requires additional equipment and cooling costs, resulting in poor energy-saving and emission-reduction effects and low energy utilization. Utility Model Content

[0004] Purpose of the utility model: The embodiment of the present application provides a cold energy power generation system and a heat exchange component, aiming to overcome the technical problem that the current cooling method of lubricating oil does not meet the requirements of energy conservation and emission reduction.

[0005] Technical Solution The embodiment of the present application provides a cold energy power generation system, comprising:

[0006] A working fluid assembly, comprising a working fluid pump, an evaporator, an expander and a condenser connected in series, wherein the condenser is connected to the working fluid pump to form a working fluid circuit;

[0007] a power generation component connected to the expander, wherein the expander is capable of driving the power generation component to generate electricity;

[0008] a lubricating oil assembly connected to the expander and the power generation assembly to form a lubricating oil circuit for cooling the expander and the power generation assembly;

[0009] The heat exchange component includes a working fluid pipe and a lubricating oil pipe arranged adjacent to each other. The working fluid pipe is connected to the working fluid circuit, and the lubricating oil pipe is connected to the lubricating oil circuit. The heat exchange component is used to transfer heat in the lubricating oil to the working fluid.

[0010] In some embodiments, the working fluid pipe is connected in series with the working fluid circuit;

[0011] The working fluid pipe is located on the pipeline between the evaporator and the expander; or, the working fluid pipe is located between the working fluid pump and the evaporator.

[0012] In some embodiments, the power generation assembly includes a generator, the expander is directly connected to the generator, and the lubricating oil assembly is respectively connected to the expander and the generator to form a lubricating oil circuit;

[0013] Alternatively, the power generation assembly includes a gearbox and a generator, the gearbox is connected to the expander and the generator respectively, and the lubricating oil assembly is connected to the expander, the gearbox and the generator respectively to form a lubricating oil circuit.

[0014] In some embodiments, the lubricating oil assembly includes a lubricating oil tank and a lubricating oil pump connected to each other, the lubricating oil pump is connected to the expander, and the lubricating oil tank is connected to the power generation assembly;

[0015] The lubricating oil pipe is connected in series with the lubricating oil circuit, and the lubricating oil pipe is located on the pipeline between the lubricating oil pump and the expander.

[0016] In some embodiments, the lubricating oil pipe is a spirally wound structure, and the working fluid pipe is sleeved outside the lubricating oil pipe.

[0017] In some embodiments, the working fluid pipe has a working fluid inlet and a working fluid outlet, the lubricating oil pipe has a lubricating oil inlet and a lubricating oil outlet, the lubricating oil inlet and the working fluid outlet are located on the same side, and the working fluid inlet and the lubricating oil outlet are located on the same side;

[0018] And / or, the flow direction of the working medium in the working medium pipe is opposite to the flow direction of the lubricating oil in the lubricating oil pipe.

[0019] In some embodiments, the condenser is used to convert the working medium exhaust gas into liquid working medium, and the condenser is any one of a shell and tube heat exchanger, a plate-fin heat exchanger, and a coiled-tube heat exchanger.

[0020] In some embodiments, the expander is any one of an axial turbine expander, a centrifugal turbine expander, a screw expander, or a scroll expander.

[0021] In some embodiments, the lubricating oil circuit is externally connected to other equipment cooled by lubricating oil.

[0022] In some embodiments, there are multiple condensers connected in parallel between the expander and the working fluid pump, and the cold source of the condenser includes one or more of liquid natural gas, liquid nitrogen, liquid oxygen, liquid helium, liquid argon, liquid air, liquid methane, and liquid hydrogen.

[0023] The present application also discloses a heat exchange assembly, comprising a working fluid pipe and a lubricating oil pipe arranged adjacent to each other, wherein the working fluid pipe is connected to the working fluid circuit of the working fluid assembly, and the lubricating oil pipe is connected to the lubricating oil circuit of the lubricating oil assembly, and the heat exchange assembly is used to transfer heat in the lubricating oil to the working fluid.

[0024] Beneficial effects: The cold energy power generation system in the embodiment of the present application includes: a working fluid component, a power generation component, a lubricating oil component and a heat exchange component; the working fluid component includes a working fluid pump, an evaporator, an expander and a condenser connected in series, the condenser is connected to the working fluid pump and forms a working fluid circuit; the power generation component is connected to the expander, and the expander can drive the power generation component to generate electricity; the lubricating oil component is connected to the expander and the power generation component and forms a lubricating oil circuit for cooling the expander and the power generation component; the heat exchange component includes a working fluid pipe and a lubricating oil pipe arranged adjacent to each other, the working fluid pipe is connected to the working fluid circuit, the lubricating oil pipe is connected to the lubricating oil circuit, and the heat exchange component is used to transfer heat in the lubricating oil to the working fluid. By recovering the heat in the lubricating oil and providing it to the working fluid, the power generation amount and power generation efficiency are improved, and the lubricating oil is cooled at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a schematic structural diagram of the cold energy power generation system according to an embodiment of the present application;

[0027] Figure 2 This is a schematic diagram of the connection relationship between the working fluid component and the working fluid circuit in the cold energy power generation system of the embodiment of the present application, and the figure also illustrates the heat exchange component;

[0028] Figure 3 This is a schematic diagram of the connection relationship between the lubricating oil component and the lubricating oil circuit in the cold energy power generation system of the embodiment of the present application, and the heat exchange component is also shown in the figure;

[0029] Figure 4 This is a structural diagram of a cold energy power generation system according to another embodiment of the present application;

[0030] Figure 5 This is a schematic structural diagram of a heat exchange component in a cold energy power generation system according to an embodiment of the present application;

[0031] Figure numerals: 1, working fluid component; 2, power generation component; 3, lubricating oil component; 4, heat exchange component; 11, working fluid pump; 12, evaporator; 13, expander; 14, condenser; 10, working fluid circuit; 30, lubricating oil circuit; 41, working fluid pipe; 42, lubricating oil pipe; 21, gear box; 22, generator; 31, lubricating oil tank; 32, lubricating oil pump; 411, working fluid inlet; 412, working fluid outlet; 421, lubricating oil inlet; 422, lubricating oil outlet; 121, heat source inlet; 122, heat source outlet; 141, cold source inlet; 142, cold source outlet. DETAILED DESCRIPTION

[0032] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of this application.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In the description of the present application, "multiple" means two or more, and at least one means one, two or more, unless otherwise clearly defined. Terms such as "first", "second", and "third" are simply names for parts or embodiments for the convenience of description, and do not imply that there is an order of importance between parts or embodiments.

[0034] As a preface to the embodiments of this application, with the rapid development of the LNG (liquefied natural gas) industry and the air separation industry, the utilization of cold energy in LNG receiving stations and air separation units has attracted increasing attention. Among them, cold energy power generation is a relatively suitable utilization method. At the same time, LNG receiving stations, LNG filling stations, LNG satellite stations, air separation units, and other enterprises have a large number of mechanical rotating equipment in the production process, most of which use lubricating oil systems for lubrication and cooling. Due to the lack of circulating cooling water, LNG receiving stations, LNG filling stations, LNG satellite stations, air separation units, and other enterprises often use air coolers for lubricating oil cooling. At the same time, generators are also often cooled by air coolers. The operation of the air cooler fan consumes additional electricity, which will lead to an increase in the plant's own power load and noise. If a new circulating cooling water system is built, it will lead to a significant increase in equipment and investment. Furthermore, many LNG receiving stations have planned cold energy power generation. However, due to the initial focus on the LNG gasification function, the requirement for superheat on the inlet side of the cold energy power generation expander in the power generation mode is not considered. This may result in insufficient heat load or liquid inlet at the expander inlet, thereby affecting the system life and power generation efficiency.

[0035] In view of this, the present application provides a cold energy power generation system and a heat exchange component to solve at least one of the above technical problems.

[0036] See also Figures 1 to 4 As shown, a cold energy power generation system in an embodiment of the present application includes: a working fluid component 1, a power generation component 2, a lubricating oil component 3 and a heat exchange component 4; wherein, the working fluid component 1 includes a working fluid pump 11, an evaporator 12, an expander 13 and a condenser 14 connected in series, and the condenser 14 is connected to the working fluid pump 11 to form a working fluid circuit 10; the power generation component 2 is connected to the expander 13, and the expander 13 can drive the power generation component 2 to generate electricity; the lubricating oil component 3 is connected to the expander 13 and the power generation component 2 to form a lubricating oil circuit 30, which is used to cool the expander 13 and the power generation component 2; the heat exchange component 4 includes a working fluid pipe 41 and a lubricating oil pipe 42 arranged adjacent to each other, the working fluid pipe 41 is connected to the working fluid circuit 10, and the lubricating oil pipe 42 is connected to the lubricating oil circuit 30, and the heat exchange component 4 is used to transfer heat in the lubricating oil to the working fluid.

[0037] It should be understood that the evaporator 12 has a heat source inlet 121 and a heat source outlet 122, and the condenser 14 has a cold source inlet 141 and a cold source outlet (eg, Figure 1(as shown). The heat source for evaporator 12 can be any process fluid with waste heat from industrial production processes, such as hot water, steam, or flue gas, or natural resources such as solar energy, seawater, or air. The cold source for condenser 14 can be one or more of LNG, liquid nitrogen, liquid oxygen, liquid helium, liquid argon, liquid air, liquid methane, or liquid hydrogen. If multiple sources are used, multiple condensers 14 are required. The working fluid in working fluid circuit 10 can be a single-component working fluid such as methane, ethane, propane, ethylene, or propylene, or a multi-component mixture.

[0038] Working principle: The heat source enters the evaporator 12 through the heat source inlet 121 and exchanges heat with the working fluid in the working fluid circuit 10. The working fluid is heated to a high-temperature and high-pressure gas and enters the expander 13, driving the expander 13 to rotate, and then drives the power generation component 2 to generate electricity. The working fluid after doing work becomes exhausted gas and enters the condenser 14 to exchange heat with the cold source, condensing into a working fluid liquid. After being pressurized by the working fluid pump 11, it enters the evaporator 12 again and exchanges heat with the heat source in the evaporator 12, and the cycle continues. The lubricating oil in the lubricating oil circuit 30 can flow through the expander 13 and the power generation component 2 to cool the expander 13 and the power generation component 2. The present application uses the heat exchange component 4 to provide the heat absorbed by the lubricating oil to the working fluid. On the one hand, the lubricating oil can be cooled without adding additional cooling equipment for cooling the lubricating oil. On the other hand, the heat energy in the lubricating oil is used to generate electricity, thereby improving the power generation and power generation efficiency of the cold energy power generation system.

[0039] The working fluid pipe 41 and the lubricating oil pipe 42 are arranged adjacent to each other. Specifically, an inner and outer pipe arrangement can be adopted, and the lubricating oil pipe 42 is passed through the working fluid pipe 41; or, the working fluid pipe 41 and the lubricating oil pipe 42 are arranged in parallel, and heat transfer is performed by direct contact heat transfer between the pipes or by heat conduction through an intermediate medium.

[0040] See also Figure 1 As shown, in some embodiments, the working fluid pipe 41 is connected in series with the working fluid circuit 10, and the working fluid pipe 41 is located in the pipeline between the evaporator 12 and the expander 13. It should be understood that after the working fluid is heated to a high-temperature and high-pressure gas and before entering the expander 13, the heated high-temperature and high-pressure working fluid gas enters the working fluid pipe 41 and is heated by the lubricating oil before entering the expander 13, thereby increasing the superheat of the working fluid, avoiding liquid on the inlet side of the expander 13, and reducing the heat load of the evaporator 12, thereby extending the service life of the equipment. Figure 4As shown, in other embodiments, the working fluid pipe 41 is connected in series with the working fluid circuit 10, and the working fluid pipe 41 is located between the working fluid pump 11 and the evaporator 12. It should be understood that before the working fluid is condensed into a working fluid liquid and pressurized by the working fluid pump 11 to enter the evaporator 12, it can enter the working fluid pipe 41 to utilize the heat carried by the lubricating oil in the lubricating oil pipe 42 to heat the working fluid in the working fluid pipe 41, thereby achieving working fluid preheating, thereby improving the working efficiency of the evaporator 12 and improving energy utilization.

[0041] In some embodiments, the working fluid pipe 41 is connected in series with the evaporator 12; alternatively, the working fluid pipe 41 and the evaporator 12 are connected in parallel. It should be understood that a series connection allows the heat absorbed from the lubricating oil by the working fluid to be directly transferred to the working fluid in the evaporator 12, thereby increasing the working fluid superheat. A parallel connection facilitates maintenance of the heat exchange assembly 4.

[0042] In some embodiments, the power generation assembly 2 includes a generator 22, the expander 13 is directly connected to the generator 22, and the lubricating oil assembly 3 is respectively connected to the expander 13 and the generator 22 to form a lubricating oil circuit 30. Figure 1 and Figure 3 As shown, in other embodiments, the power generation assembly 2 includes a gearbox 21 and a generator 22. The gearbox 21 is connected to the expander 13 and the generator 22, respectively. The lubricating oil assembly 3 is connected to the expander 13, the gearbox 21, and the generator 22, respectively, to form a lubricating oil circuit 30. Specifically, the lubricating oil simultaneously flows into the bearings and seals of the expander 13, the bearings of the gearbox 21, the bearings of the generator 22, and the cooler to remove heat from the above-mentioned power generation equipment or cooling equipment, and then flows into the heat exchange assembly 4 to transfer the heat of the lubricating oil to the working medium, thereby superheating the working medium and reducing the temperature of the lubricating oil.

[0043] See also Figure 1 、 Figure 3 and Figure 4 As shown, in some embodiments, the lubricating oil assembly 3 includes a connected lubricating oil tank 31 and a lubricating oil pump 32. The lubricating oil pump 32 is connected to the expander 13, and the lubricating oil tank 31 is connected to the power generation assembly 2. A lubricating oil pipe 42 is connected in series with the lubricating oil circuit 30, and the lubricating oil pipe 42 is located in the pipeline between the lubricating oil pump 32 and the expander 13. After cooling the expander 13 and the power generation assembly 2, the lubricating oil flows into the lubricating oil tank 31, and is then pressurized by the lubricating oil pump 32 to enter the heat exchange assembly 4 for heat exchange cooling. When the heat is transferred to the working fluid, the lubricating oil is cooled and enters the expander 13 again, achieving cyclic cooling.

[0044] See also Figure 5As shown, in some embodiments, the lubricating oil pipe 42 has a spirally wound structure, and the working fluid pipe 41 is sleeved outside the lubricating oil pipe 42. It should be understood that the spirally wound structure of the lubricating oil pipe 42 can achieve a larger area of ​​heat exchange in a smaller space, thus saving space and preventing the lubricating oil pipe 42 from being too long. At the same time, the portion of the lubricating oil pipe 42 arranged inside the working fluid pipe 41 can achieve heat exchange, which can further reduce the heat dissipation in the lubricating oil, thereby further improving heat exchange efficiency, ensuring that the heat in the lubricating oil can be absorbed and utilized by the working fluid, and ultimately achieving improved power generation efficiency.

[0045] See also Figure 5 As shown, in some embodiments, the working fluid pipe 41 has a working fluid inlet 411 and a working fluid outlet 412, and the lubricating oil pipe 42 has a lubricating oil inlet 421 and a lubricating oil outlet 422. The lubricating oil inlet 421 and the working fluid outlet 412 are located on the same side, and the working fluid inlet 411 and the lubricating oil outlet 422 are located on the same side; and / or, the working fluid flow direction in the working fluid pipe 41 is opposite to the lubricating oil flow direction in the lubricating oil pipe 42. It should be understood that when the lubricating oil inlet and the working fluid outlet 412 are located on the same side, the working fluid temperature near the working fluid outlet 412 can be further increased. The flow directions of the lubricating oil and the working fluid are opposite, so that the temperature of the working fluid outlet end in the working fluid pipe 41 is slightly higher than the temperature of the working fluid inlet end, thereby ensuring the linear uniformity of the working fluid temperature in the working fluid pipe 41, so as to better utilize the heat absorbed by the lubricating oil cooling to generate electricity.

[0046] In some embodiments, the condenser 14 is used to convert the working medium exhaust gas into liquid working medium. The condenser 14 is any one of a shell and tube heat exchanger, a plate-fin heat exchanger, and a coiled-tube heat exchanger.

[0047] In some embodiments, the expander 13 is any one of an axial turbine expander 13 , a centrifugal turbine expander 13 , a screw expander 13 , or a scroll expander 13 .

[0048] In some embodiments, the lubricating oil circuit 30 is externally connected to other equipment cooled by lubricating oil, such as compressors and expanders from other equipment in the factory.

[0049] In some embodiments, there are multiple condensers 14 connected in parallel between the expander 13 and the working fluid pump 11. The cold source of the condenser 14 includes one or more of liquid natural gas, liquid nitrogen, liquid oxygen, liquid helium, liquid argon, liquid air, liquid methane, and liquid hydrogen.

[0050] This application also discloses a heat exchange assembly 4, comprising a working fluid pipe 41 and a lubricating oil pipe 42 arranged adjacent to each other. The working fluid pipe 41 is connected to the working fluid circuit 10 of the working fluid assembly 1, and the lubricating oil pipe 42 is connected to the lubricating oil circuit 30 of the lubricating oil assembly 3. The heat exchange assembly 4 is configured to transfer heat from the lubricating oil to the working fluid. In the above embodiments, the description of each embodiment has its own emphasis. For portions not detailed in one embodiment, reference can be made to the relevant descriptions of other embodiments.

[0051] The above is a detailed introduction to a cold energy power generation system and a heat exchange component provided in the embodiments of the present application, and specific examples are used to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cold energy power generation system, characterized in that: include: A working fluid assembly (1) comprises a working fluid pump (11), an evaporator (12), an expander (13) and a condenser (14) connected in series, wherein the condenser (14) is connected to the working fluid pump (11) to form a working fluid circuit (10); A power generation component (2) is connected to the expander (13), and the expander (13) is capable of driving the power generation component (2) to generate electricity; a lubricating oil assembly (3) connected to the expander (13) and the power generation assembly (2) to form a lubricating oil circuit (30) for cooling the expander (13) and the power generation assembly (2); The heat exchange assembly (4) comprises a working fluid pipe (41) and a lubricating oil pipe (42) arranged adjacent to each other, wherein the working fluid pipe (41) is in communication with the working fluid circuit (10), and the lubricating oil pipe (42) is in communication with the lubricating oil circuit (30). The heat exchange assembly (4) is used to transfer heat in the lubricating oil to the working fluid.

2. The cold energy power generation system according to claim 1, characterized in that: The working fluid pipe (41) is connected in series with the working fluid circuit (10); The working fluid pipe (41) is located on the pipeline between the evaporator (12) and the expander (13); or, the working fluid pipe (41) is located between the working fluid pump (11) and the evaporator (12).

3. The cold energy power generation system according to claim 1, characterized in that: The power generation assembly (2) includes a generator (22), the expander (13) is directly connected to the generator (22), and the lubricating oil assembly (3) is respectively connected to the expander (13) and the generator (22) to form a lubricating oil circuit (30); Alternatively, the power generation component (2) includes a gear box (21) and a generator (22), the gear box (21) is connected to the expander (13) and the generator (22) respectively, and the lubricating oil component (3) is connected to the expander (13), the gear box (21) and the generator (22) respectively to form a lubricating oil circuit (30).

4. The cold energy power generation system according to claim 1, characterized in that: The lubricating oil assembly (3) comprises a lubricating oil tank (31) and a lubricating oil pump (32) connected to each other, the lubricating oil pump (32) is connected to the expander (13), and the lubricating oil tank (31) is connected to the power generation assembly (2); The lubricating oil pipe (42) is connected in series with the lubricating oil circuit (30), and the lubricating oil pipe (42) is located on the pipeline between the lubricating oil pump (32) and the expander (13).

5. The cold energy power generation system according to claim 1, characterized in that: The lubricating oil pipe (42) is a spirally wound structure, and the working fluid pipe (41) is sleeved outside the lubricating oil pipe (42).

6. The cold energy power generation system according to claim 5, characterized in that: The working fluid pipe (41) has a working fluid inlet (411) and a working fluid outlet (412); the lubricating oil pipe (42) has a lubricating oil inlet (421) and a lubricating oil outlet (422); the lubricating oil inlet (421) and the working fluid outlet (412) are located on the same side; and the working fluid inlet (411) and the lubricating oil outlet (422) are located on the same side. And / or, the flow direction of the working medium in the working medium pipe (41) is opposite to the flow direction of the lubricating oil in the lubricating oil pipe (42).

7. The cold energy power generation system according to claim 1, characterized in that: The condenser (14) is used to convert the working medium exhaust gas into liquid working medium. The condenser (14) is any one of a shell and tube heat exchanger, a plate-fin heat exchanger, and a coiled heat exchanger.

8. The cold energy power generation system according to claim 1, characterized in that: The expander (13) is any one of an axial turbine expander (13), a centripetal turbine expander (13), a centrifugal turbine expander (13), a screw expander (13) or a scroll expander (13).

9. The cold energy power generation system according to claim 1, characterized in that: The lubricating oil circuit (30) is externally connected to other equipment cooled by lubricating oil.

10. The cold energy power generation system according to claim 1, characterized in that: There are multiple condensers (14) connected in parallel between the expander (13) and the working fluid pump (11), and the cold source of the condenser (14) includes one or more of liquid natural gas, liquid nitrogen, liquid oxygen, liquid helium, liquid argon, liquid air, liquid methane, and liquid hydrogen.

11. A heat exchange component, characterized in that: The heat exchange assembly (4) comprises a working fluid pipe (41) and a lubricating oil pipe (42) arranged adjacent to each other, wherein the working fluid pipe (41) is in communication with a working fluid circuit (10) of a working fluid assembly (1), and the lubricating oil pipe (42) is in communication with a lubricating oil circuit (30) of a lubricating oil assembly (3). The heat exchange assembly (4) is used to transfer heat in the lubricating oil to the working fluid.

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