A multi-mode organic rankine compression refrigeration cycle system based on solar energy utilization

Abstract

This invention discloses a multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization, comprising a high-pressure evaporator, an expander, a second clutch, a condenser, a working fluid pump, a low-pressure evaporator, a four-way reversing valve, a compressor, a first clutch, a generator, a solar collector, a water tank module, and a water pump module. The high-pressure evaporator, expander, condenser, and working fluid pump are sequentially connected to form an organic Rankine cycle subsystem; the compressor, condenser, and low-pressure evaporator are sequentially connected to form a vapor compression refrigeration subsystem; and the solar collector, water tank module, and water pump module are sequentially connected to form a solar thermal collection cycle system. Based on a solar-driven forward and reverse coupling system, this system combines the Rankine cycle and compression refrigeration cycle, adds a four-way valve, and integrates with solar energy and a hot water storage tank, making the system adjustable, saving investment costs, improving energy utilization, and meeting users' comprehensive needs for cooling, heating, and electricity.

Description

Technical Field

[0001] This invention relates to the field of solar refrigeration technology, and in particular to a multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization. Background Technology

[0002] Improving the overall energy utilization rate and developing advanced energy conversion systems have become important ways to build a clean and low-carbon energy system and achieve the "dual carbon goals." How to improve energy utilization efficiency is a key issue in achieving these goals. The application of solar thermal energy in the cooling process has enormous potential in reducing fossil fuel consumption and alleviating environmental problems. Solar-assisted air conditioning systems are particularly attractive for regions where both solar energy supply and cooling demand are at their maximum levels.

[0003] The solar-driven positive and negative coupling system in related technologies lacks adjustability. When factors such as different seasons, temperatures, and sunlight affect the heat storage, a mismatch may occur between the supply and demand of solar energy and the building load. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization, which effectively solves the problem of supply and demand mismatch between solar energy and building load in solar heating systems. Furthermore, the number of cycles that can be activated can be determined according to the amount of heat stored to reduce heat loss. This allows the cycle system to break through the single energy supply mode, possessing adjustability while improving energy utilization efficiency, and meeting users' comprehensive needs for cooling, heating, and electricity.

[0005] According to a first aspect of the present invention, a multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization includes: a high-pressure evaporator, an expander, a second clutch, a condenser, a working fluid pump, a low-pressure evaporator, a four-way reversing valve, a compressor, a first clutch, a generator, a solar collector, a water tank module, and a water pump module.

[0006] The expander is connected to the generator via the first clutch, and the expander is connected to the compressor via the second clutch. The four-way reversing valve has a first channel and a second channel, and the water tank module has an upper inlet, an upper outlet, a lower inlet, and a lower outlet.

[0007] The high-pressure evaporator has a first branch and a second branch at its outlet. The first branch is equipped with a third solenoid valve and is connected to the inlet of the condenser through a second channel. The second branch is equipped with a fourth solenoid valve and is connected to the inlet of the expander. The outlet of the expander is connected to the inlet of the condenser through the second channel. The outlet of the condenser is equipped with a first throttling valve and a first solenoid valve arranged in parallel, and then splits into a third branch and a fourth branch. The third branch is connected to the inlet of the working fluid pump, and the outlet of the working fluid pump is connected to the inlet of the high-pressure evaporator, thus forming an organic Rankine cycle subsystem.

[0008] The compressor outlet is connected to the condenser inlet via the second channel. The fourth branch is equipped with a second throttle valve and a second solenoid valve arranged in parallel, and is then connected to the inlet of the low-pressure evaporator. The low-pressure evaporator outlet is connected to the compressor inlet via the first channel, thus forming a vapor compression refrigeration subsystem.

[0009] The outlet of the solar collector is connected to the upper inlet via a fifth solenoid valve, the upper outlet is connected to the inlet of the high-pressure evaporator via a water pump module, the outlet of the high-pressure evaporator is connected to the lower inlet via a sixth solenoid valve, and the lower outlet is connected to the inlet of the solar collector to form a solar thermal circulation system.

[0010] According to a first aspect embodiment of the present invention, the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization has at least the following beneficial effects: based on a solar-driven positive and negative coupling system, the Rankine cycle and the compression refrigeration cycle are combined, and a method of obtaining low-temperature cooling capacity is achieved by using a medium-low temperature heat source. At the same time, in order to save investment costs, a four-way valve is added and combined with solar energy and a hot water storage tank, using medium-low temperature solar energy as the driving heat source, so that the system has adjustability, improves energy utilization, and meets the user's comprehensive needs for cooling, heating and electricity.

[0011] According to a first aspect embodiment of the present invention, in a multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization, the water tank module is configured as a three-stage water tank, with the upper inlet, upper outlet, lower inlet, and lower outlet of each water tank connected in parallel.

[0012] According to a first aspect embodiment of the present invention, in the solar-powered multi-mode organic Rankine compression refrigeration cycle system, each of the fifth and sixth solenoid valves is opened to fully open all three stages of the water tank module, the first clutch is closed, the second clutch is disengaged, the first throttle valve, the second solenoid valve, and the fourth solenoid valve are opened, and the first solenoid valve, the second throttle valve, and the third solenoid valve are closed, so that the kinetic energy generated by the expander is used for power generation, and the solar-powered multi-mode organic Rankine compression refrigeration cycle system enters the power generation mode.

[0013] According to a first aspect embodiment of the present invention, in a solar-powered multi-mode organic Rankine compression refrigeration cycle system, each of the fifth and sixth solenoid valves is opened to fully open all three stages of the water tank module, the first clutch is disengaged, the second clutch is engaged, the first throttle valve, the second solenoid valve, and the fourth solenoid valve are opened, and the first solenoid valve, the second throttle valve, and the third solenoid valve are closed, so that the kinetic energy generated by the expander is used to drive the compressor for refrigeration, and the solar-powered multi-mode organic Rankine compression refrigeration cycle system enters the refrigeration mode.

[0014] According to a first aspect embodiment of the present invention, in a solar-powered multi-mode organic Rankine compression refrigeration cycle system, the fifth and sixth solenoid valves in a portion of the water tank are opened to open the water tank module in one or two stages, the four-way reversing valve is reversed, the first clutch is closed, the second clutch is disengaged, the first throttle valve, the second solenoid valve, and the fourth solenoid valve are closed, and the first solenoid valve, the second throttle valve, and the third solenoid valve are opened, so as to electrically drive the compressor to do work, and the solar-powered multi-mode organic Rankine compression refrigeration cycle system enters the heating mode.

[0015] According to a first aspect embodiment of the present invention, in the solar-powered multimode organic Rankine compression refrigeration cycle system, each of the fifth and sixth solenoid valves is closed to completely shut down the water tank module in three stages, the first clutch is disengaged, the second clutch is disengaged, the fourth solenoid valve is closed, and the third solenoid valve is opened, so that the vapor compression refrigeration subsystem in the solar-powered multimode organic Rankine compression refrigeration cycle system operates in a cyclic manner.

[0016] The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization according to a first aspect embodiment of the present invention further includes a temperature controller for monitoring the temperature of the solar collector.

[0017] According to the first aspect of the present invention, in the solar-powered multi-mode organic Rankine compression refrigeration cycle system, when the temperature monitored by the thermostat is above 125°C, the solar-powered multi-mode organic Rankine compression refrigeration cycle system enters either a refrigeration mode or a power generation mode.

[0018] According to the first aspect of the present invention, in the solar-powered multi-mode organic Rankine compression refrigeration cycle system, when the temperature monitored by the thermostat is above 80°C, the solar-powered multi-mode organic Rankine compression refrigeration cycle system enters the heating mode.

[0019] According to a first aspect embodiment of the present invention, in a multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization, the expander is coaxially connected to the compressor.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0022] Figure 1 This is a system schematic diagram according to an embodiment of the present invention.

[0023] Figure label:

[0024] 1. High-pressure evaporator; 2. Expander; 3. Second clutch; 4. Condenser; 5. Working fluid pump; 6. First throttle valve; 7. Low-pressure evaporator; 8. Four-way reversing valve; 9. Compressor; 10. First clutch; 11. Generator; 12. Second throttle valve; 13. Solar collector; 14. Thermostat; 15. First water tank; 16. Second water tank; 17. Third water tank; 18. First water pump; 19. Second water pump; 20. First solenoid valve; 21. Second solenoid valve; 22. Third solenoid valve; 23. Fourth solenoid valve. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0027] In the description of this application, "several" means one or more, "more than" means at least two, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in this application after considering the specific content of the technical solution.

[0029] Reference Figure 1 The first aspect of this application describes a multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization. This system organically combines the Rankine cycle and the vapor compression refrigeration cycle, and uses a three-stage water tank to absorb solar energy as a heat source, enabling the system to be adjusted in multiple modes according to seasonality to meet cooling, heating, and power demands. The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization includes a high-pressure evaporator 1, an expander 2, a second clutch 3, a condenser 4, a working fluid pump 5, a low-pressure evaporator 7, a four-way reversing valve 8, a compressor 9, a first clutch 10, a generator 11, a solar collector 13, a water tank module, and a water pump module. The expander 2 is connected to the generator 11 via the first clutch 10, and to the compressor 9 via the second clutch 3. The four-way reversing valve 8 has a first channel and a second channel. The water tank module has an upper inlet, an upper outlet, a lower inlet, and a lower outlet.

[0030] The high-pressure evaporator 1 has a first branch and a second branch at its outlet. The first branch is equipped with a third solenoid valve 22 and is connected to the inlet of the condenser 4 via a second channel. The second branch is equipped with a fourth solenoid valve 23 and is connected to the inlet of the expander 2. The outlet of the expander 2 is connected to the inlet of the condenser 4 via a second channel. The outlet of the condenser 4 is equipped with a first throttling valve 6 and a first solenoid valve 20 connected in parallel, and then splits into a third branch and a fourth branch. The third branch is connected to the inlet of the working fluid pump 5, and the outlet of the working fluid pump 5 is connected to the inlet of the high-pressure evaporator 1, thus forming an organic Rankine cycle subsystem. The compressor 9's outlet is connected to the inlet of the condenser 4 via a second channel. The fourth branch is equipped with a second throttling valve 12 and a second solenoid valve 21 connected in parallel, and is then connected to the inlet of the low-pressure evaporator 7. The outlet of the low-pressure evaporator 7 is connected to the inlet of the compressor 9 via a first channel, thus forming a vapor compression refrigeration subsystem. The outlet of the solar collector 13 is connected to the upper inlet via a fifth solenoid valve, the upper outlet is connected to the inlet of the high-pressure evaporator 1 via a water pump module, the outlet of the high-pressure evaporator 1 is connected to the lower inlet via a sixth solenoid valve, and the lower outlet is connected to the inlet of the solar collector 13, thus forming a solar thermal circulation system.

[0031] Reference Figure 1 The first aspect of this application describes a multi-mode organic Rankine compression refrigeration system based on solar energy utilization. This system is a solar-driven positive and negative coupling system that combines the Rankine cycle and the compression refrigeration cycle. It utilizes a medium-low temperature heat source to obtain low-temperature cooling capacity. To save investment costs, a four-way valve is added and combined with solar energy and a hot water storage tank, using medium-low temperature solar energy as the driving heat source. This makes the system adjustable, improves energy utilization, and meets the user's comprehensive needs for cooling, heating, and electricity.

[0032] It should be noted that in the organic Rankine cycle subsystem, the high-pressure evaporator 1 absorbs heat from the heat source water. The organic working fluid in the high-pressure evaporator 1 evaporates and enters the expander 2. The organic working fluid output from the expander 2 mixes with the organic working fluid output from the compressor 9 and flows through the condenser 4, condensing into a liquid working fluid. A portion of the liquid working fluid is pressurized by the working fluid pump 5 and then returns to the high-pressure evaporator 1, completing the power sub-cycle. In the vapor compression refrigeration subsystem, the organic working fluid is cooled by the condenser 4 and condenses into a liquid working fluid. The liquid working fluid is cooled and depressurized by the expansion valve and enters the low-pressure evaporator 7 for evaporation. The evaporated organic working fluid enters the compressor 9 for pressurization, mixes with the organic working fluid output from the expander 2, and returns to the condenser 4, completing the vapor compression refrigeration cycle. Preferably, the expander 2 and the compressor 9 are coaxially connected, that is, the expander 2 in the organic Rankine cycle subsystem and the compressor 9 in the vapor compression refrigeration subsystem are coaxially connected through the second clutch 3.

[0033] In some embodiments of this application, the water tank module is configured as a three-stage water tank, including a first water tank 15, a second water tank 16, and a third water tank 17. The upper inlet, upper outlet, lower inlet, and lower outlet of each water tank are connected in parallel. Further, the water pump module includes a first water pump 18 and a second water pump 19. The first water pump 18 is located between the outlet and lower inlet of the high-pressure evaporator 1, and the second water pump 19 is located between the upper outlet and the inlet of the high-pressure evaporator 1. Based on the solar thermal collector cycle system, the organic Rankine cycle subsystem, and the vapor compression refrigeration subsystem, the use of a three-stage water tank effectively solves the problem of supply and demand mismatch between solar energy and building load in the solar heating system, and the number of pumps activated can be determined according to the heat storage to reduce heat loss. In some embodiments of this application, a thermostat 14 is also included, which is used to monitor the temperature of the solar collector 13. Specifically, when the temperature monitored by the thermostat 14 is above 125°C, the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters either cooling mode or power generation mode. When the temperature monitored by the thermostat 14 is above 80°C, the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters heating mode.

[0034] It should be noted that by adding a four-way valve and a clutch to the traditional organic Rankine-compression refrigeration cycle system, the cycle system breaks through the single-energy supply mode. Considering factors such as season, temperature, and sunlight, four operating modes are implemented based on actual conditions: summer cooling, winter combined with electric-driven heating, pure power generation during off-load seasons, and electric-driven cooling (heating) on ​​cloudy days. The system can be selected as needed. The multi-mode organic Rankine-compression refrigeration cycle system based on solar energy utilization uses a medium-low temperature heat source, namely solar energy. Therefore, this application can be used as a small-scale distributed energy system in rural areas with abundant sunlight and low population density. Specific embodiments are further described below.

[0035] In some embodiments of this application, each of the fifth and sixth solenoid valves is opened to fully open all three stages of the water tank module, the first clutch 10 is closed, the second clutch 3 is disengaged, the first throttle valve 6, the second solenoid valve 21, and the fourth solenoid valve 23 are opened, and the first solenoid valve 20, the second throttle valve 12, and the third solenoid valve 22 are closed, so that the kinetic energy generated by the expander 2 can be used for power generation, and the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters the power generation mode.

[0036] Understandably, the system adopts power generation mode during the off-load season, with all three stages of water tanks 15, 16 and 17 fully open, the first clutch 10 between expander 2 and generator 11 closed, and the second clutch 3 between expander 2 and compressor 9 disconnected. At this time, all the kinetic energy generated by expander 2 is used for power generation.

[0037] In some embodiments of this application, each of the fifth and sixth solenoid valves is opened to fully open all three stages of the water tank module, the first clutch 10 is disengaged, the second clutch 3 is closed, the first throttle valve 6, the second solenoid valve 21, and the fourth solenoid valve 23 are opened, and the first solenoid valve 20, the second throttle valve 12, and the third solenoid valve 22 are closed, so that the kinetic energy generated by the expander 2 is used to drive the compressor 9 for refrigeration, and the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters the refrigeration mode.

[0038] Understandably, in summer, when using cooling mode, all three water tanks (first, second, and third) are open. When the temperature monitored by the thermostat 14 exceeds 125°C, the valves of the first, second, and third water tanks 15 and 17 open. The first clutch 10 between the expander 2 and the generator 11 is disengaged, and the second clutch 3 between the expander 2 and the compressor 9 is engaged. At this time, only the Rankine cycle subsystem is working, and all the kinetic energy generated by the expander 2 is used to drive the compressor 9 for cooling.

[0039] In some embodiments of this application, the fifth and sixth solenoid valves in a portion of the water tank are opened to enable the water tank module to open at level one or level two, the four-way reversing valve 8 is reversed, the first clutch 10 is closed, the second clutch 3 is disengaged, the first throttle valve 6, the second solenoid valve 21, and the fourth solenoid valve 23 are closed, and the first solenoid valve 20, the second throttle valve 12, and the third solenoid valve 22 are opened, so as to enable the electrically driven compressor 9 to perform work, and the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters the heating mode.

[0040] Understandably, in winter, when the heating mode is used, the first water tank 15, the second water tank 16, and the third water tank 17 are opened at one or two levels depending on the solar radiation of the month. When the temperature monitored by the thermostat 14 is above 80℃, the valves of the first water tank 15, the second water tank 16, and the third water tank 17 are opened. The four-way reversing valve 8 reverses, closing the first throttle valve 6 and the second solenoid valve 21, and opening the second throttle valve 12 and the first solenoid valve 20. The low-pressure evaporator 7 and the condenser 4 switch functions, closing the fourth solenoid valve 23 and opening the third solenoid valve 22, thus disengaging the second clutch 3 between the expander 2 and the compressor 9. At this time, the expander 2 does not perform work, and the electrically driven compressor 9 performs work.

[0041] In some embodiments of this application, each fifth solenoid valve and each sixth solenoid valve are closed to completely close the three stages of the water tank module, the first clutch 10 is disengaged, the second clutch 3 is disengaged, the fourth solenoid valve 23 is closed, and the third solenoid valve 22 is opened, so that the vapor compression refrigeration subsystem in the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization can operate in a cycle.

[0042] Understandably, when there is no solar energy input for an extended period of cloudy weather, all three stages of the system—first water tank 15, second water tank 16, and third water tank 17—are shut down. The first clutch 10 between the expander 2 and the generator 11 is disengaged, and the second clutch 3 between the expander 2 and the compressor 9 is disengaged. At this time, only the vapor compression refrigeration (heating) cycle operates. The refrigeration (heating) cycle can be controlled by referring to the above-mentioned cooling mode in summer and heating mode in winter, which will not be described again here.

[0043] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments.

[0044] like Figure 1 As shown, Figure 1 This is a schematic diagram of an embodiment of a multi-mode organic Rankine-compression refrigeration cycle system based on solar energy utilization provided by the present invention. S1 to S10 represent the working fluid, S11 and S12 represent the heat source medium, S13 and S14 represent air, S15 and S16 represent hot water / chilled water, and S17 represents solar energy. The system includes a heat source water cycle, a power sub-cycle, and a vapor compression refrigeration sub-cycle. The system uses a solar-heated water tank as a heat source to drive the power sub-cycle, and the work done by the power sub-cycle drives the vapor compression refrigeration sub-cycle for cooling.

[0045] Reference Figure 1 The power sub-cycle includes a high-pressure evaporator 1, an expander 2, a condenser 4, and a working fluid pump 5 connected in sequence. The organic working fluid S1 from the high-pressure evaporator 1 is expanded by the expander 2 to form S2, which mixes with the organic working fluid S10 flowing out of the compressor 9 to form S3, which enters the condenser 4. A portion of the condensed organic working fluid S4 is diverted to S5 and pressurized by the working fluid pump 5. The pressurized organic working fluid S6 returns to the high-pressure evaporator 1, completing the power sub-cycle.

[0046] Among them, the high-pressure evaporator 1 is a fluid heat exchange device used to absorb heat from the heat source water S11; the expander 2 is a gas expansion and work device that uses high-temperature and high-pressure steam expansion to do work; the condenser 4 is a condensation device used to condense the circulating steam, and the condensation heat is discharged to the environment through air S13; the working fluid pump 5 is a liquid pressurization device used to increase the liquid pressure.

[0047] Reference Figure 1The vapor compression refrigeration subcycle includes a condenser 4, a throttling valve, a low-pressure evaporator 7, and a compressor 9. A portion of the organic working fluid S4 from the condenser 4 is diverted to S7 and enters the first throttling valve 6, where it expands into a low-temperature working fluid S8. The organic working fluid S9 from the low-pressure evaporator 7 is pressurized by the compressor 9 to form S10, which mixes with the organic working fluid S2 flowing out of the expander 2 to form S3, which then enters the condenser 4, completing the vapor compression refrigeration subcycle.

[0048] Among them, condenser 4 is a condensing device used to condense the circulating steam; first throttling valve 6 is a throttling device used to reduce the pressure of high-pressure liquid working fluid; low-pressure evaporator 7 is a fluid heat exchange device in which the refrigerant absorbs heat from hot water S15 and evaporates to produce chilled water S16; compressor 9 is a booster device used to increase gas pressure.

[0049] Reference Figure 1 In the off-season, the power generation mode is used. The first clutch 10 between the expander 2 and the generator 11 is closed, and the second clutch 3 between the expander 2 and the compressor 9 is disengaged. In this mode, all the kinetic energy generated by the expander 2 is used for power generation. In summer, the cooling mode is used. The first clutch 10 between the expander 2 and the generator 11 is disengaged, and the second clutch 3 between the expander 2 and the compressor 9 is closed. In this mode, all the kinetic energy generated by the expander 2 is used to drive the compressor 9 for cooling. In winter, the heating mode is used. When clutch 10 is closed, the second clutch 3 between expander 2 and compressor 9 is disengaged, the four-way reversing valve 8 is reversed, the first throttle valve 6 and the second solenoid valve 21 are closed, the second throttle valve 12 and the first solenoid valve 20 are opened, the third solenoid valve 22 is opened, and the fourth solenoid valve 23 is closed. At this time, expander 2 does not perform work, and the electrically driven compressor 9 performs work. On cloudy days when there is no solar energy input, the first clutch 10 between expander 2 and generator 11 can be disengaged, and the second clutch 3 between expander 2 and compressor 9 can be disengaged. At this time, expander 2 does not work, and only compressor 9 works.

[0050] This solar-powered multimode organic Rankine-compression refrigeration cycle system is driven by a medium- and low-temperature heat source, namely solar energy. In this solar-powered multimode organic Rankine-compression refrigeration cycle system, the power sub-cycle and the vapor compression refrigeration sub-cycle share the same working medium, which can be R134a, but is not limited to R134a; other working media can also be used.

[0051] To better demonstrate the adjustability and feasibility of this invention based on seasonal changes, Matlab software was used to simulate this embodiment, and meteorological data for Jinan, Shandong Province, was obtained using Meteonorm software. A multi-mode organic Rankine-compression refrigeration cycle system for solar energy utilization was used to measure heating, power generation, and cooling output under certain boundary conditions. Table 1 shows the boundary conditions of the system, and Table 2 shows the average daily heating, power generation, and cooling output for the 11 days from the 10th to the 20th of the month.

[0052] Table 1

[0053]

[0054] Table 2

[0055] December heating volume January heating volume February heating volume April power generation August cooling volume Daily average (kWh) 306.9027 364.6651 619.2807 70.98566297 263.6244

[0056] Table 2 shows the heating, power generation, and cooling capacity provided by solar energy in different seasons. Specifically, only the first-stage water tank was activated in December and January, while both stages were activated in February.

[0057] The present invention provides a multi-mode organic Rankine-compression refrigeration cycle system based on solar energy utilization, the advantages of which are:

[0058] 1. The compressor 9 is driven by the expander 2. When there is sufficient solar energy, there is no need for additional electricity to drive the compressor 9, which reduces the conversion loss between mechanical energy and electrical energy.

[0059] 2. In summer, solar power is used for cooling, and in winter, solar power combined with electric drive is used for heating, which greatly saves on power generation costs and reduces carbon emissions; solar-heated water tanks are used as medium and low temperature heat sources to achieve the goal of energy conservation and emission reduction.

[0060] 3. The solar thermal collector circulation section adopts a three-stage water tank to improve the stability of the heat source and effectively solves the problem of supply and demand mismatch between solar energy and building load in the solar heating system;

[0061] 4. The multi-stage hot water storage tank can be activated in a number of stages based on the amount of heat stored, reducing heat loss. The four-way valve and clutch can be adjusted according to seasonality to meet cooling, heating, and electricity demands. Breaking away from a single energy supply model, the system can be optimized and refined by considering factors such as season, temperature, and sunlight. Based on actual conditions, it offers four operating modes: summer cooling, winter combined with electric heating, pure power generation during off-load seasons, and electric cooling (heating) on ​​cloudy days, which can be selected as needed.

[0062] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization, characterized in that, include: High-pressure evaporator, expander, second clutch, condenser, working fluid pump, low-pressure evaporator, four-way reversing valve, compressor, first clutch, generator, solar collector, water tank module and water pump module; The expander is connected to the generator via the first clutch, and the expander is connected to the compressor via the second clutch. The four-way reversing valve has a first channel and a second channel, and the water tank module has an upper inlet, an upper outlet, a lower inlet, and a lower outlet. The high-pressure evaporator has a first branch and a second branch at its outlet. The first branch is equipped with a third solenoid valve and is connected to the inlet of the condenser through a second channel. The second branch is equipped with a fourth solenoid valve and is connected to the inlet of the expander. The outlet of the expander is connected to the inlet of the condenser through the second channel. The outlet of the condenser is equipped with a first throttling valve and a first solenoid valve arranged in parallel, and then splits into a third branch and a fourth branch. The third branch is connected to the inlet of the working fluid pump, and the outlet of the working fluid pump is connected to the inlet of the high-pressure evaporator, thus forming an organic Rankine cycle subsystem. The compressor outlet is connected to the condenser inlet via the second channel. The fourth branch is equipped with a second throttle valve and a second solenoid valve arranged in parallel, and is then connected to the inlet of the low-pressure evaporator. The low-pressure evaporator outlet is connected to the compressor inlet via the first channel, thus forming a vapor compression refrigeration subsystem. The outlet of the solar collector is connected to the upper inlet via a fifth solenoid valve, the upper outlet is connected to the inlet of the high-pressure evaporator via a water pump module, the outlet of the high-pressure evaporator is connected to the lower inlet via a sixth solenoid valve, and the lower outlet is connected to the inlet of the solar collector to form a solar thermal circulation system. The water tank module is configured as a three-stage water tank, with the upper inlet, upper outlet, lower inlet, and lower outlet of each water tank connected in parallel. Each of the fifth and sixth solenoid valves is opened to fully open all three stages of the water tank module. The first clutch is closed, the second clutch is disengaged, the first throttle valve, the second solenoid valve, and the fourth solenoid valve are opened, and the first solenoid valve, the second throttle valve, and the third solenoid valve are closed, so that the kinetic energy generated by the expander can be used to generate electricity, and the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters the power generation mode. Each of the fifth and sixth solenoid valves is opened to fully open all three stages of the water tank module. The first clutch is disengaged, the second clutch is engaged, the first throttle valve, the second solenoid valve, and the fourth solenoid valve are opened, and the first solenoid valve, the second throttle valve, and the third solenoid valve are closed, so that the kinetic energy generated by the expander can be used to drive the compressor for refrigeration. The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters the refrigeration mode. The fifth and sixth solenoid valves in some water tanks are opened to open the water tank module to open one or two levels, the four-way reversing valve is reversed, the first clutch is closed, the second clutch is disengaged, the first throttle valve, the second solenoid valve, and the fourth solenoid valve are closed, and the first solenoid valve, the second throttle valve, and the third solenoid valve are opened to drive the compressor to do work, and the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters the heating mode; It also includes a thermostat for monitoring the temperature of the solar collector; When the temperature monitored by the thermostat is above 125°C, the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters either refrigeration mode or power generation mode. When the temperature monitored by the thermostat is above 80°C, the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization enters the heating mode.

2. The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization according to claim 1, characterized in that: The fifth and sixth solenoid valves are closed respectively, causing the water tank module to be completely shut down in three stages. The first clutch is disengaged, the second clutch is disengaged, the fourth solenoid valve is closed, and the third solenoid valve is opened, so that the vapor compression refrigeration subsystem in the multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization can operate in a cycle.

3. The multi-mode organic Rankine compression refrigeration cycle system based on solar energy utilization according to any one of claims 1 to 2, characterized in that: The expander is coaxially connected to the compressor.

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