A heating and cooling system based on forward and reverse cycle coupling

Abstract

The present invention discloses a heating and cooling system based on forward and reverse cycle coupling, and the system is composed of a solar thermal collection unit, an organic Rankine cycle unit, a heating and cooling unit, and a control unit. The heat collected by the solar thermal collection unit is transferred to the generator in the organic Rankine cycle unit, the organic working fluid in the generator evaporates to form steam and enters the expander, the mechanical energy output by the expander in the organic Rankine cycle unit is transferred to the compressor of the heating and cooling unit through a direct drive shaft to drive the heating and cooling unit, the evaporator in the heating and cooling unit absorbs heat, the water temperature in the cold water tank is reduced, and the condenser in the heating and cooling unit releases heat to heat the water in the hot water tank. The system does not need additional electric energy to drive the compressor, and can make full use of low-grade solar energy to achieve cooling and heating.

Description

Technical Field

[0001] The present invention relates to the technical field of heating and refrigeration, and in particular to a heating and refrigeration system based on forward and reverse cycle coupling. Background Art

[0002] Heat pumps have the advantages of energy saving, environmental protection, and reliable performance. The refrigeration and heating unit absorbs energy from cold water, converts it into heat under the action of the compressor and transfers it to the hot water tank. At the same time, the low-temperature chilled water that has lost a lot of energy is transported to the space that needs cooling. It has the function of one machine with multiple uses, but it needs to use electricity to drive the compressor in the steam compression cycle to achieve heating and cooling functions. The electricity to drive the steam compression cycle mainly comes from the combustion of fossil fuels. The energy pollution caused by the combustion of fossil fuels, mainly coal, is the main cause of haze.

[0003] Solar energy is both a primary energy source and a renewable energy source. It is abundant in resources, can be used for free, does not require transportation, and does not pollute the environment. Solar energy has become an important part of human energy use, replacing electricity converted from fossil fuels, and is constantly being developed, which can effectively reduce the use of electricity. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a heating and cooling system based on forward and reverse cycle coupling, which uses solar energy instead of electrical energy converted from fossil fuels to drive the compressor in the steam compression cycle to achieve dual functions of cooling and heating.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A heating and cooling system based on forward and reverse cycle coupling, comprising:

[0007] A solar thermal collection unit, which is used to absorb solar energy and convert the solar energy into thermal energy and store the thermal energy;

[0008] An organic Rankine cycle unit, which is used to utilize the heat energy stored in the solar thermal collection unit to heat its own liquid organic working fluid to form a gaseous organic working fluid; and

[0009] A heating and cooling unit is used to realize cooling and heating processes simultaneously by utilizing the physical state change of its own refrigerant, wherein the gaseous organic working medium performs work and drives the heating and cooling unit to operate through a transmission mechanism.

[0010] As described above, the heating and cooling system based on forward and reverse cycle coupling, further, the solar thermal collection unit includes a solar thermal collector, a heat storage device, a first water pump, a generator and a second water pump, wherein,

[0011] The solar collector, the heat accumulator and the first water pump are connected in sequence through pipelines to form a first heat collection loop; the heat accumulator, the generator and the second water pump are connected in sequence through pipelines to form a second heat collection loop;

[0012] The second heat collection circuit absorbs the thermal energy stored in the first heat collection circuit through the heat accumulator.

[0013] As described above, the heating and cooling system based on forward and reverse cycle coupling, further, the organic Rankine unit includes a generator, an expander, a condenser and a working fluid pump, wherein:

[0014] The generator, the expander, the condenser and the working fluid pump are connected in sequence through pipelines to form an organic Rankine cycle loop. After the organic working fluid absorbs the heat energy of the heat accumulator in the generator to heat up and form superheated steam, the superheated steam enters the expander to perform work.

[0015] As described above, the heating and cooling system based on forward and reverse cycle coupling, further, the heating and cooling unit includes a compressor, a condenser, a throttle valve, an evaporator, a hot water pump, a hot water tank, a cold water pump and a cold water tank, wherein,

[0016] The compressor, the condenser, the throttle valve and the evaporator are connected in sequence through pipelines to form a steam compression circulation loop;

[0017] The condenser, the hot water pump and the hot water tank are connected in sequence through pipelines to form a hot water circulation loop;

[0018] The evaporator, the cold water tank and the cold water pump are connected in sequence through pipelines to form a cold water circulation loop;

[0019] The steam compression circulation loop is connected to the hot water circulation loop through the condenser;

[0020] The steam compression circulation loop is connected to the cold water circulation loop through the evaporator;

[0021] The compressor compresses the vapor refrigerant in the first temperature and pressure state to form the vapor refrigerant in the second temperature and pressure state. The vapor refrigerant in the second temperature and pressure state condenses in the condenser and releases heat to the hot water to form the liquid refrigerant in the third temperature and pressure state, thereby realizing the heating process of the system; at the same time, the liquid refrigerant in the third temperature and pressure state coming out of the condenser enters the evaporator to form a gas-liquid mixture after being throttled by the throttle valve. The gas-liquid mixture in the evaporator absorbs the heat of the cold water and becomes the vapor refrigerant in the first temperature and pressure state, thereby realizing the refrigeration process of the system.

[0022] In the heating and cooling system based on forward and reverse cycle coupling as described above, further, the two adjacent coupling channels of the generator flow through water and an organic working medium respectively, and the flow direction of the water is opposite to that of the organic working medium at least part of the time; the two adjacent coupling channels of the condenser flow through refrigerant and hot water respectively, and the flow direction of the refrigerant is opposite to that of the hot water at least part of the time; the two adjacent coupling channels of the evaporator flow through refrigerant and cold water respectively, and the flow direction of the refrigerant is opposite to that of the cold water at least part of the time.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The expander in the organic Rankine cycle unit of the present invention is connected to the compressor of the heating and cooling unit through a direct drive shaft, and the power transmission efficiency of the system is improved;

[0025] 2. The expander in the organic Rankine cycle unit of the present invention directly drives the compressor of the heating and cooling unit, and no additional electric energy is required to drive the compressor, thereby reducing the conversion loss between mechanical energy and electric energy.

[0026] 3. The mechanical energy output by the expander in the organic Rankine cycle unit of the present invention is transmitted to the compressor of the heating and cooling unit through the direct drive shaft, driving the heating and cooling unit. The evaporator in the heating and cooling unit absorbs heat, and the water temperature in the cold water tank is reduced. At the same time, the condenser in the heating and cooling unit releases heat to heat the water in the hot water tank. The dual functions of cooling and heating are realized simultaneously, and the energy-saving and emission-reduction effect of the system is remarkable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 It is a schematic diagram of a heating and cooling system based on forward and reverse cycle coupling of the present invention.

[0029] In the figure: 1; solar collector; 2; heat storage; 3; first water pump; 4; generator; 5; second water pump; 6; expansion machine; 7; condenser; 8; working fluid pump; 9; direct drive shaft; 10; compressor; 11; condenser; 12; throttle valve; 13; evaporator; 14; cold water pump; 15; cold water tank; 16; hot water pump; 17; hot water tank. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] Example:

[0032] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations of the embodiments of the present invention are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0033] In the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly defined. In addition, unless otherwise clearly defined and defined, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] See also Figure 1 , Figure 1 The present invention provides a heating and cooling system based on forward and reverse cycle coupling, which uses solar energy instead of electric energy converted from fossil fuels to drive the compressor in the steam compression cycle to achieve dual functions of cooling and heating.

[0035] like Figure 1 As shown, the heating and cooling system embodiment based on forward and reverse cycle coupling provided by the present invention includes:

[0036] The heating and cooling system based on forward and reverse cycle coupling consists of a solar thermal collection unit, an organic Rankine cycle unit, a heating and cooling unit and a control unit; the solar thermal collection unit is connected to the organic Rankine cycle unit through a generator 4, and the organic Rankine cycle unit is connected to the heating and cooling unit through a direct drive shaft 9.

[0037] Preferably, the solar thermal collection unit includes a solar collector 1, a heat accumulator 2, a first water pump 3, a generator 4 and a second water pump 5, wherein the solar collector 1, the heat accumulator 2 and the first water pump 3 are connected in sequence through pipelines to form a first heat collection circuit, the heat accumulator 2, the generator 4 and the second water pump 5 are connected in sequence through pipelines to form a second heat collection circuit, and the first heat collection circuit is connected to the second heat collection circuit through the heat accumulator 2.

[0038] Furthermore, the organic Rankine unit includes a generator 4, an expander 6, a condenser 7 and a working fluid pump 8, and the generator 4, the expander 6, the condenser 7 and the working fluid pump 8 are sequentially connected through pipelines to form an organic Rankine cycle loop.

[0039] Preferably, the heating and cooling unit includes a compressor 10, a condenser 11, a throttle valve 12, an evaporator 13, a hot water pump 16, a hot water tank 17, a cold water pump 14 and a cold water tank 15, wherein the compressor 10, the condenser 11, the throttle valve 12 and the evaporator 13 are connected in sequence through pipelines to form a steam compression circulation loop, the condenser 11, the hot water pump 16 and the hot water tank 17 are connected in sequence through pipelines to form a hot water circulation loop, the evaporator 13, the cold water tank 15 and the cold water pump 14 are connected in sequence through pipelines to form a cold water circulation loop, the steam compression circulation loop is connected to the hot water circulation loop through the condenser 11; the steam compression circulation loop is connected to the cold water circulation loop through the evaporator 13.

[0040] Furthermore, water and an organic working medium flow through the adjacent channels of the generator 4, respectively, and the flow direction of water is generally opposite to that of the organic working medium; refrigerant and hot water flow through the adjacent channels of the condenser 11, respectively, and the flow direction of the refrigerant is generally opposite to that of the hot water; refrigerant and cold water flow through the adjacent channels of the evaporator 13, respectively, and the flow direction of the refrigerant is generally opposite to that of the cold water.

[0041] Preferably, the solar thermal collector 1 absorbs solar energy and converts it to generate thermal energy. Under the action of the first water pump 3, the solar thermal collector 1 transfers the converted heat through the water medium and stores it in the heat accumulator 2. Under the action of the second water pump 5, the heat accumulator 2 transfers the heat to the generator 4 through the water medium. The organic working medium absorbs the heat energy of the heat accumulator 2 in the generator 4 and heats up to form superheated steam. The steam enters the expander 6 to perform work. The mechanical energy output by the expander 6 is transmitted to the compressor 10 of the heating and cooling unit through the direct drive shaft 9. The compressor 10 compresses the low-temperature and low-pressure refrigerant steam into high-temperature and high-pressure steam. In the condenser 11, the high-temperature and high-pressure steam condenses and releases heat to hot water and is condensed into a high-pressure liquid, thereby realizing the heating function of the system. At the same time, the high-pressure refrigerant liquid coming out of the condenser 11 enters the evaporator 13 after throttling by the throttle valve 12 to form a gas-liquid mixture. The gas-liquid mixture in the evaporator 13 absorbs the heat of the cold water and becomes a low-pressure refrigerant gas, thereby realizing the refrigeration function of the system.

[0042] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0043] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable ordinary technicians in the field to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made based on the essence of the content of the present invention should be included in the protection scope of the present invention.

Claims

1. A heating and cooling system based on forward and reverse cycle coupling, characterized in that: include: A solar thermal collection unit, which is used to absorb solar energy and convert the solar energy into thermal energy and store the thermal energy; An organic Rankine cycle unit, which is used to utilize the heat energy stored in the solar thermal collection unit to heat its own liquid organic working fluid to form a gaseous organic working fluid. Specifically, the organic Rankine unit includes a generator, an expander, a condenser and a working fluid pump. The generator, the expander, the condenser and the working fluid pump are sequentially connected through pipelines to form an organic Rankine cycle loop. After the organic working fluid absorbs the heat energy of the heat accumulator of the solar thermal collection unit in the generator to heat up to form superheated steam, the superheated steam enters the expander to perform work; and, A heating and cooling unit, which is used to realize the cooling and heating processes simultaneously by utilizing the physical state change of its own refrigerant, wherein the gaseous organic working medium performs work and drives the heating and cooling unit to operate through a transmission mechanism, wherein the heating and cooling unit comprises a compressor, a condenser, a throttle valve, an evaporator, a hot water pump, a hot water tank, a cold water pump and a cold water tank, wherein, The compressor, the condenser, the throttle valve and the evaporator are connected in sequence through pipelines to form a steam compression circulation loop; The condenser, the hot water pump and the hot water tank are connected in sequence through pipes to form a hot water circulation loop; The evaporator, the cold water tank and the cold water pump are connected in sequence through pipelines to form a cold water circulation loop; The steam compression circulation loop is connected to the hot water circulation loop through the condenser; The steam compression circulation loop is connected to the cold water circulation loop through the evaporator; The compressor compresses the vapor refrigerant in the first temperature and pressure state to form the vapor refrigerant in the second temperature and pressure state. The vapor refrigerant in the second temperature and pressure state condenses in the condenser and releases heat to the hot water to form the liquid refrigerant in the third temperature and pressure state, thereby realizing the heating process of the system; at the same time, the liquid refrigerant in the third temperature and pressure state coming out of the condenser enters the evaporator to form a gas-liquid mixture after being throttled by the throttle valve. The gas-liquid mixture in the evaporator absorbs the heat of the cold water and becomes the vapor refrigerant in the first temperature and pressure state, thereby realizing the refrigeration process of the system.

2. The heating and cooling system based on forward and reverse cycle coupling according to claim 1 is characterized in that: The solar thermal collection unit comprises a solar thermal collector, a heat storage device, a first water pump, a generator and a second water pump, wherein: The solar collector, the heat accumulator and the first water pump are connected in sequence through pipelines to form a first heat collection loop; the heat accumulator, the generator and the second water pump are connected in sequence through pipelines to form a second heat collection loop; The second heat collection circuit absorbs the thermal energy stored in the first heat collection circuit through the heat accumulator.

3. The heating and cooling system based on forward and reverse cycle coupling according to claim 2 is characterized in that: The two adjacent coupling channels of the generator flow through water and organic working medium respectively, and the flow direction of water is opposite to that of the organic working medium at least part of the time; the two adjacent coupling channels of the condenser flow through refrigerant and hot water respectively, and the flow direction of the refrigerant is opposite to that of the hot water at least part of the time; The refrigerant and the cold water flow through the two adjacent coupling channels of the evaporator respectively, and the flow direction of the refrigerant is opposite to the flow direction of the cold water at least part of the time.

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