Solar auxiliary circulating air conditioning system

Abstract

The invention discloses a solar auxiliary circulating air conditioning system, belongs to the technical field of comprehensive utilization of air conditioners and solar energy, and aims to solve the technical problems that an existing solar refrigerating system is low in solar heat utilization efficiency, complex in system structure and limited in application occasion. According to the technical scheme, the solar air conditioner comprises a controller, a solar heat collector, an evaporator, a condenser, a first turbine, a second turbine, a third turbine, a second compressor and a first compressor, the outlet end of the evaporator communicates with the inlet end of the first turbine, and the outlet end of the first turbine communicates with the inlet end of the first compressor through a first valve; the outlet end of the first compressor is divided into two branches, one branch is a main refrigeration pipeline, and the other branch is a solar auxiliary refrigeration pipeline. Wherein one end of the main refrigeration pipeline is communicated with the outlet end of the first compressor, the other end of the main refrigeration pipeline is communicated with the inlet end of the condenser through the first electromagnetic valve, and the outlet end of the condenser is communicated with the inlet end of the evaporator.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning and solar energy comprehensive utilization, in particular to a solar energy assisted circulation air conditioning system. BACKGROUND

[0002] The refrigeration technology using solar energy is an important direction to reduce the energy consumption of air conditioning. The existing technologies are as follows: ① Solar photovoltaic driven refrigeration system: a traditional compressor is driven by photovoltaic cells to generate electricity, which has the disadvantages of low photoelectric conversion efficiency, the need to configure expensive storage batteries or rely on the backup of power grid, high initial investment, and failure to completely break away from traditional electric energy.

[0003] ② Solar heat driven refrigeration system (such as absorption / adsorption): using heat collector heat to refrigerate. The system structure is complex, the temperature of the heat source is high, the performance is significantly reduced when the radiation is insufficient, the refrigeration efficiency is generally low, and the application occasions are limited.

[0004] ③ Traditional electric vapor compression refrigeration system: although the technology is mature, it completely relies on power supply, has high operation cost and large carbon emission, and aggravates energy load.

[0005] In summary, the existing technologies have the disadvantages of efficiency, cost or stability, and it is difficult to balance high energy efficiency, stable operation and low carbon target. SUMMARY

[0006] The technical task of the present application is to provide a solar energy assisted circulation air conditioning system to solve the problems of low solar heat utilization efficiency, complex system structure and limited application occasions of the existing solar refrigeration system.

[0007] The technical task of the present application is realized in the following way: a solar energy assisted circulation air conditioning system, comprising a controller, a solar heat collector, an evaporator, a condenser, a turbine one, a turbine two, a turbine three, a compressor two and a compressor one, the outlet end of the evaporator is communicated with the inlet end of the turbine one, the outlet end of the turbine one is communicated with the inlet end of the compressor one through a valve one, the outlet end of the compressor one is divided into two branches: one branch is a main refrigeration pipeline, and the other branch is a solar energy assisted refrigeration pipeline; The one end of the main refrigeration pipeline is communicated with the outlet end of the compressor one, the other end of the main refrigeration pipeline is communicated with the inlet end of the condenser through an electromagnetic valve one, and the outlet end of the condenser is communicated with the inlet end of the evaporator; One end of the solar energy auxiliary refrigeration pipeline is connected with the outlet end of the compressor one, the other end of the solar energy auxiliary refrigeration pipeline is connected with the inlet end of the turbine two through the electromagnetic valve two, the outlet end of the turbine two is connected with the inlet end of the compressor two through the valve two, the outlet end of the compressor two is connected with the inlet end of the solar energy collector, the outlet end of the solar energy collector is connected with the inlet end of the turbine three, the outlet end of the turbine three is connected with the inlet end of the condenser through the electromagnetic valve three. The controller is electrically connected with and controls the electromagnetic valve one, the electromagnetic valve two, the electromagnetic valve three, the valve one, the valve two, the valve three and the solar energy collector.

[0008] Preferably, an electronic expansion valve is arranged on the pipeline connecting the evaporator and the condenser.

[0009] Preferably, a fluorine pump bypass is arranged at the outlet end of the condenser, a fluorine pump is arranged on the fluorine pump bypass, the fluorine pump is arranged in parallel with the compressor one, and a valve three is arranged on the pipeline connecting the outlet end of the fluorine pump and the evaporator.

[0010] Preferably, a compression bypass one is connected with one outlet end of the valve one, and the compression bypass one is arranged in parallel with the compressor one.

[0011] Preferably, a compression bypass two is connected with one outlet end of the valve two, and the compression bypass two is arranged in parallel with the compressor two.

[0012] Preferably, an output shaft of the turbine three is directly connected with input shafts of the turbine one and the turbine two, mechanical work is directly transmitted, and a variable speed transmission assembly is arranged between the turbine three and the turbine one and the turbine two. The electromagnetic valve three forms a bypass pipeline from the inlet end of the turbine two to the inlet end of the condenser, and the bypass pipeline is used for continuing operation in the solar energy auxiliary mode. The solar energy collector adopts a concentrating solar energy collector or a vacuum tube type collector. The compressor one and the compressor two both adopt a low pressure ratio compressor.

[0013] More preferably, the controller captures the change of solar radiation intensity in real time through a spectral radiometer, and automatically adjusts the opening and closing of the electromagnetic valve one, the electromagnetic valve two, the electromagnetic valve three, the valve one, the valve two and the valve three according to a preset control strategy, so as to automatically and smoothly realize the conversion from one sub-cycle to another sub-cycle according to the change of sunshine conditions. The control strategy includes a fluorine pump compression double-engine refrigeration mode and a solar energy auxiliary mode.

[0014] More preferably, the fluorine pump compression double-engine refrigeration mode is as follows: In the absence of solar radiation, the controller controls the electromagnetic valve one to start, and the electromagnetic valve two and the electromagnetic valve three to close; when the outdoor temperature is lower than the set temperature threshold, the refrigerant is driven by the fluorine pump without passing through the compressor one, the refrigerant is evaporated and vaporized through the evaporator, and then passes through the valve one, the compression bypass one and the electromagnetic valve one to the condenser to be liquefied, and the refrigerant after liquefaction is driven by the fluorine pump to the inlet end of the evaporator to complete the natural cold cycle; when the outdoor temperature is higher than the set temperature threshold, the refrigerant is compressed by the compressor one, and then directly enters the condenser to be condensed through the electromagnetic valve one, and finally completes the refrigeration cycle in the evaporator by throttling and pressure reduction through the electronic expansion valve.

[0015] More preferably, the solar auxiliary mode refers to when the controller detects sufficient solar radiation, specifically as follows: The automatic control electromagnetic valve one is closed, and the electromagnetic valve two and the electromagnetic valve three are opened, at this time the refrigerant gas absorbed from the evaporator is compressed by the turbine one, and the controller detects the compression ratio: If the compression requirement is met, it does not pass through the compressor one, and directly passes through the compression bypass one to the compressor two; If the compression requirement is not met, it is supplemented by the compressor one, the refrigerant discharged by the compressor one flows through the turbine two for secondary pressurization, and the controller detects the steam pressure output by the turbine two: If the compression requirement is met, it does not pass through the compressor two, and directly passes through the compression bypass two to the solar collector; If the compression requirement is not met, it is supplemented by the compressor two, and then the refrigerant enters the solar collector to absorb solar radiation heat to become high-temperature and high-pressure superheated steam, which then drives the turbine three to expand and do work, the mechanical work output by the turbine three directly drives the turbine one and the turbine two to rotate, and finally the refrigerant enters the condenser to complete the subsequent cycle.

[0016] More preferably, the refrigerant adopts R123 or R1233zd.

[0017] The solar auxiliary cycle air conditioning system has the following advantages: (1) The present application comprises a coupled steam compression refrigeration cycle and an open Joule cycle based on concentrated solar energy; in the absence of solar radiation, it runs in dual-mode energy-saving mode through the fluorine pump and the steam compression; in the presence of solar radiation, the electromagnetic valve switches the path, so that the refrigerant sequentially passes through two-stage turbines, two-stage compressors, a solar collector to absorb heat and a turbine to expand and do work, and then enters the condenser, in the process, the expansion work generated by the expansion turbine can drive the two-stage compression turbine to offset part of the energy consumption of the compressor, and the compressor plays an auxiliary pressurization role according to the pressurization of the two-stage turbine, thereby reducing the total energy consumption of the system; effectively utilizing solar energy to improve the energy efficiency of the air conditioning system, realizing the integrated and collaborative operation of traditional electric drive and solar heat and work conversion; (II) This invention achieves automatic and optimized switching between two working modes: a refrigerant pump compression dual-engine refrigeration mode and a solar-assisted mode, through a controller. This ensures stable system operation and maximizes the utilization of solar energy. The solar collector converts low-grade solar radiation energy into high-grade thermal energy, while the turbine converts thermal energy into mechanical energy to compensate for compressor energy consumption, significantly improving the system's energy utilization efficiency. Compared with existing technologies, this invention not only effectively reduces the electricity consumption of traditional air conditioning systems but also solves the problem of weather conditions restricting simple solar refrigeration systems, providing a highly efficient, intelligent, and environmentally friendly air conditioning solution. (III) This invention, through intelligent switching between dual operating modes, can reduce compressor energy consumption by 40%-50% when there is sufficient sunshine by using solar-assisted circulation, significantly saving operating costs; through an efficient heat-work conversion mechanism, the net utilization efficiency of solar energy is increased to over 35%, breaking through the limitations of traditional solar cooling that is subject to weather, and achieving stable cooling in all weather conditions; at the same time, it effectively reduces peak load on the power grid and indirect carbon emissions, with outstanding energy-saving and environmental protection benefits; the system has a compact structure, requires no special components, and has good economic efficiency and promotion value.

[0018] Therefore, this invention has the characteristics of reasonable design, simple structure, easy processing, small size, convenient use, and multiple uses, and thus has great value for promotion and use. Attached Figure Description

[0019] The invention will be further described below with reference to the accompanying drawings.

[0020] Appendix Figure 1 This is a schematic diagram of a solar-assisted circulating air conditioning system; Appendix Figure 2 A schematic diagram of a dual-engine refrigeration mode using a refrigerant pump compression system; Appendix Figure 3 This is a schematic diagram of the solar-assisted mode.

[0021] In the diagram, 1. Controller, 2. Solar collector, 3. Evaporator, 4. Condenser, 5. Turbine 1, 6. Turbine 2, 7. Turbine 3, 8. Compressor 2, 9. Compressor 1, 10. Valve 1, 11. Main refrigeration pipeline, 12. Solar auxiliary refrigeration pipeline, 13. Solenoid valve 1, 14. Solenoid valve 2, 15. Valve 2, 16. Solenoid valve 3, 17. Electronic expansion valve, 18. Refrigerant pump bypass, 19. Refrigerant pump, 20. Valve 3, 21. Compression bypass 1, 22. Compression bypass 2, 23. Bypass pipeline. Detailed Implementation

[0022] The following detailed description of a solar-assisted circulating air conditioning system according to the present invention is based on the accompanying drawings and specific embodiments.

[0023] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0024] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. Embodiment

[0025] As shown in the accompanying Figure 1 The embodiment provides a solar auxiliary circulating air conditioning system, which comprises a controller 1, a solar heat collector 2, an evaporator 3, a condenser 4, a turbine 1 5, a turbine 2 6, a turbine 3 7, a compressor 2 8 and a compressor 1 9. The outlet end of the evaporator 3 is connected to the inlet end of the turbine 1 5. The outlet end of the turbine 1 5 is connected to the inlet end of the compressor 1 9 through a valve 1 0. The outlet end of the compressor 1 9 is divided into two branches: one branch is a main refrigeration pipeline 1 1, and the other branch is a solar auxiliary refrigeration pipeline 1 2. The outlet end of the main refrigeration pipeline 1 1 is connected to the outlet end of the compressor 1 9. The other end of the main refrigeration pipeline 1 1 is connected to the inlet end of the condenser 4 through a solenoid valve 1 3. The outlet end of the condenser 4 is connected to the inlet end of the evaporator 3. The outlet end of the solar auxiliary refrigeration pipeline 1 2 is connected to the outlet end of the compressor 1 9. The other end of the solar auxiliary refrigeration pipeline 1 2 is connected to the inlet end of the turbine 2 6 through a solenoid valve 2 1 4. The outlet end of the turbine 2 6 is connected to the inlet end of the compressor 2 8 through a valve 2 1 5. The outlet end of the compressor 2 8 is connected to the inlet end of the solar heat collector 2. The outlet end of the solar heat collector 2 is connected to the inlet end of the turbine 3 7. The outlet end of the turbine 3 7 is connected to the inlet end of the condenser 4 through a solenoid valve 3 1 6. The controller 1 is electrically connected to and controls the solenoid valve 1 3, the solenoid valve 2 1 4, the solenoid valve 3 1 6, the valve 1 0, the valve 2 1 5, the valve 3 2 0 and the solar heat collector 2.

[0026] The evaporator 3 in the embodiment is connected with the pipeline of the condenser 4, and an electronic expansion valve 17 is installed on the pipeline.

[0027] The outlet end of the condenser 4 in the embodiment is connected with a fluorine pump bypass 18, a fluorine pump 19 is installed on the fluorine pump bypass 18, the fluorine pump 19 is connected in parallel with the compressor 9, and a valve 20 is installed on the pipeline connected with the evaporator 3 at the outlet end of the fluorine pump 19.

[0028] The outlet end of the valve 10 in the embodiment is connected with a compression bypass 21, and the compression bypass 21 is connected in parallel with the compressor 9.

[0029] The outlet end of the valve 15 in the embodiment is connected with a compression bypass 22, and the compression bypass 22 is connected in parallel with the compressor 8.

[0030] The outlet of the compressor 9 in the embodiment is divided into two branches, the first branch is connected with the inlet of the condenser 4 through the electromagnetic valve 13, and the second branch is connected with the inlet of the condenser 4 through the electromagnetic valve 14, the turbine 6, the compressor 8, the solar energy collector 2 and the turbine 7 in sequence; the output shaft of the turbine 7 is connected with the input shafts of the turbine 5 and the turbine 6; the electromagnetic valve 16 is connected between the outlet of the turbine 7 and the inlet of the condenser 4; the electromagnetic valve 13, the electromagnetic valve 14 and the electromagnetic valve 16 are controlled by a controller capable of adjusting the opening and closing state in real time according to the intensity of solar radiation, so as to realize automatic switching between the solar energy auxiliary circulation mode and the conventional refrigeration mode. Among them, the controller 1 controls the opening and closing of the electromagnetic valve based on the solar radiation data captured by the sensor, opens the electromagnetic valve 13 and closes the electromagnetic valve 14 and the electromagnetic valve 16 when there is no solar radiation, so that the system operates according to the fluorine pump compression double-drive refrigeration cycle; when there is solar radiation, the electromagnetic valve 13 is closed, and the electromagnetic valve 14 and the electromagnetic valve 16 are opened, so that the refrigerant flows through the turbine 6, the compressor 8, the solar energy collector 2 and the turbine 7 in sequence. The output shaft of the turbine 7 in the embodiment is directly connected with the input shafts of the turbine 5 and the turbine 6, mechanical work is directly transmitted, and a variable speed transmission assembly is installed between the turbine 7 and the turbine 5 and the turbine 6.

[0031] The electromagnetic valve 16 in the embodiment constitutes a bypass pipeline 23 from the inlet end of the turbine 6 to the inlet end of the condenser 4, and the bypass pipeline 23 is used for continuing operation in the solar energy auxiliary mode. The solar energy collector 2 in the embodiment adopts a concentrating solar energy collector or a vacuum tube type collector.

[0032] The compressor 9 and the compressor 8 in the embodiment both adopt a low-pressure ratio compressor.

[0033] The controller 1 in the embodiment captures the change of solar radiation intensity in real time through the spectral radiometer, and automatically adjusts the opening and closing of the electromagnetic valve 1, the electromagnetic valve 2, the electromagnetic valve 3, the valve 1, the valve 2 and the valve 3 according to the preset control strategy, so as to automatically and smoothly realize the conversion from one sub-cycle to another sub-cycle according to the change of sunshine condition; wherein the control strategy includes the fluorine pump compression double-drive refrigeration mode and the solar auxiliary mode.

[0034] The fluorine pump compression double-drive refrigeration mode in the embodiment is specifically as follows: Under the condition of no solar radiation, the controller 1 controls the electromagnetic valve 1 to start, and the electromagnetic valve 2 and the electromagnetic valve 3 to close; when the outdoor temperature is lower than the set temperature threshold, the refrigerant is driven by the fluorine pump 19 without passing through the compressor 1, the refrigerant is evaporated and vaporized through the evaporator 3, and then passes through the valve 1, the compression bypass 2 and the electromagnetic valve 1 to the condenser 4 to be liquefied, and the liquefied refrigerant is driven to the inlet end of the evaporator 3 by the fluorine pump 19 to complete the natural cooling cycle; when the outdoor temperature is higher than the set temperature threshold, the refrigerant passes through the compressor 1 after compression, and then directly enters the condenser 4 through the electromagnetic valve 1 to be condensed, and then is throttled and pressure-reduced through the electronic expansion valve 17, and finally absorbs heat and evaporates in the evaporator 3 to complete the refrigeration cycle, which ensures that the system can be energy-saving and reliably operated under any weather condition.

[0035] The solar auxiliary mode in the embodiment refers to that when the controller 1 detects sufficient solar radiation, the specific process is as follows: The electromagnetic valve 1 is automatically controlled to be closed, and the electromagnetic valve 2 and the electromagnetic valve 3 are automatically controlled to be opened, at this time, the refrigerant gas absorbed from the evaporator 3 is compressed through the turbine 1, and the controller 1 detects the compression ratio: If the compression requirement is met, the refrigerant directly passes through the compression bypass 1 to the compressor 2 without passing through the compressor 1; If the compression requirement is not met, the refrigerant is supplemented by the compressor 1, the refrigerant discharged from the compressor 1 flows through the turbine 2 for secondary pressurization, and the controller 1 detects the steam pressure output by the turbine 2: If the compression requirement is met, the refrigerant directly passes through the compression bypass 2 to the solar heat collector 2 without passing through the compressor 2; If the compression requirement is not met, the refrigerant is supplemented by the compressor 2, and then the refrigerant enters the solar heat collector 2 to absorb solar radiation heat to become high-temperature and high-pressure superheated steam, which then drives the turbine 3 to expand and work, the mechanical work output by the turbine 3 directly drives the turbine 1 and the turbine 2 to rotate, and finally the refrigerant enters the condenser 4 to complete the subsequent cycle.

[0036] The refrigerant in the embodiment adopts R123 or R1233zd.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit the present application; although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A solar energy assisted cycle air conditioning system, characterized by, The system comprises a controller, a solar collector, an evaporator, a condenser, turbine one, turbine two, turbine three, compressor two and compressor one. The outlet end of the evaporator is connected to the inlet end of turbine one, the outlet end of turbine one is connected to the inlet end of compressor one through valve one, the outlet end of compressor one is divided into two branches: one branch is the main refrigeration pipeline, and the other branch is the solar auxiliary refrigeration pipeline; The outlet end of the condenser is connected to the inlet end of the evaporator. The outlet end of the solar auxiliary refrigeration pipeline is connected to the inlet end of turbine three, and the outlet end of turbine three is connected to the inlet end of the condenser through electromagnetic valve three.

2. The solar energy assisted air conditioning system of claim 1, wherein, The controller is electrically connected to and controls electromagnetic valve one, electromagnetic valve two, electromagnetic valve three, valve one, valve two, valve three and the solar collector.

3. The solar energy assisted air conditioning system of claim 1, wherein, An electronic expansion valve is arranged on the pipeline connecting the evaporator and the condenser.

4. The solar energy assisted air conditioning system of claim 1, wherein, The condenser outlet end is provided with a fluorine pump bypass, a fluorine pump is arranged on the fluorine pump bypass, the fluorine pump is connected in parallel with compressor one, and valve three is arranged on the pipeline connecting the outlet end of the fluorine pump and the evaporator.

5. The solar energy assisted air conditioning system of claim 1, wherein, The outlet end of valve one is connected to a compression bypass one, and the compression bypass one is connected in parallel with compressor one.

6. The solar energy assisted air conditioning system of claim 1, wherein, The outlet end of valve two is connected to a compression bypass two, and the compression bypass two is connected in parallel with compressor two. The output shaft of turbine three is directly connected to the input shafts of turbine one and turbine two, mechanical power is directly transmitted, and a variable speed transmission assembly is arranged between turbine three and turbine one and turbine two. Electromagnetic valve three forms a bypass pipeline from the inlet end of turbine two to the inlet end of the condenser, and the bypass pipeline is used to continue operation in the solar auxiliary mode. The solar collector adopts a concentrating solar collector or a vacuum tube type collector.

7. The solar energy assisted air conditioning system according to any one of claims 1 to 6, wherein Compressor one and compressor two are both low-pressure ratio compressors. The controller captures the change of solar radiation intensity in real time through a spectral radiometer, automatically adjusts the opening and closing of electromagnetic valve one, electromagnetic valve two, electromagnetic valve three, valve one, valve two and valve three according to a preset control strategy, and automatically and smoothly realizes the conversion from one sub-cycle to another sub-cycle according to the change of sunshine conditions.

8. The solar-assisted air conditioning system of claim 7, wherein, The control strategy includes a fluorine pump compression dual-drive refrigeration mode and a solar auxiliary mode. The fluorine pump compression dual-drive refrigeration mode is as follows: In the absence of solar radiation, the controller controls the electromagnetic valve one to start, and the electromagnetic valve two and the electromagnetic valve three to close; when the outdoor temperature is lower than the set temperature threshold, the refrigerant evaporates and vaporizes through the evaporator, and then passes through the valve one, the compression bypass one and the electromagnetic valve one to the condenser to liquefy, and the liquefied refrigerant is driven to the evaporator inlet end by the fluorine pump to complete the natural cold cycle; when the outdoor temperature is higher than the set temperature threshold, the refrigerant is compressed by the compressor one, and then directly enters the condenser through the electromagnetic valve one, and then is throttled and pressure-reduced by the electronic expansion valve, and finally absorbs heat and evaporates in the evaporator to complete the refrigeration cycle.

9. The solar-assisted air conditioning system of claim 7, wherein, The solar energy auxiliary mode refers to when the controller detects sufficient solar radiation, as follows: The automatic control electromagnetic valve one is closed, and the electromagnetic valve two and the electromagnetic valve three are opened, at this time the refrigerant gas absorbing heat from the evaporator is compressed by the turbine one, and the controller detects the compression ratio: If the compression requirement is met, it does not pass through the compressor one, but directly passes through the compression bypass one to the compressor two; If the compression requirement is not met, it is supplemented by the compressor one, the refrigerant discharged by the compressor one flows through the turbine two for secondary pressurization, and the controller detects the steam pressure output by the turbine two: If the compression requirement is met, it does not pass through the compressor two, but directly passes through the compression bypass two to the solar energy collector; If the compression requirement is not met, it is supplemented by the compressor two, and then the refrigerant enters the solar energy collector to absorb solar radiation heat to become high-temperature and high-pressure superheated steam, then drives the turbine three to expand and work, the mechanical work output by the turbine three directly drives the turbine one and the turbine two to rotate, and finally the refrigerant enters the condenser to complete the subsequent cycle.

10. The solar-assisted air conditioning system of claim 9, wherein, The refrigerant adopts R123 or R1233zd.

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