A hot and cold water unit with complementary and composite utilization of air source and multiple energy sources and its working method

Abstract

The present invention provides a hot and cold water unit with complementary and composite utilization of air source and multiple energy sources. A partition is arranged in the shell to divide the space in the shell into the upper space of the unit and the lower space of the unit; an air inlet, an air source heat exchange coil, a fan and an air outlet are arranged from left to right in the upper space of the unit; a compressor, a complementary energy heat exchanger 1, a complementary energy heat exchanger 2 and a user-side heat exchanger are arranged in the lower space of the unit; at the same time, the present invention also provides a working method of the hot and cold water unit with complementary and composite utilization of air source and multiple energy sources. In the present invention, convenient and suitable multiple energy sources are utilized in the form of low-grade water to complement and composite with a stable air source, directly participate in the operation of the unit system, improve the working conditions of the air source heat pump, so that the unit not only has energy-saving advantages under normal climatic conditions, but also shows its working stability and energy-saving performance in the hot weather in summer or the low temperature environment in winter.

Description

Technical Field

[0001] The present invention relates to the technical field of cooling and heating air conditioners, and in particular to a cooling and hot water unit utilizing air source and multiple energy sources in a complementary and composite manner and a working method thereof. Background Art

[0002] The development and utilization of renewable clean energy has become an important way to solve global energy and environmental problems. With the improvement of people's living standards in my country, the proportion of building cooling and heating energy consumption in the total social energy consumption is gradually increasing. It is urgent to develop and utilize new energy to solve the problem of building energy consumption.

[0003] At present, the most common application form is to use cold and hot water as heat transfer media to provide cooling and heating for buildings. Air source heat pump products are currently the mainstream of the equipment that provides cold and hot water. With the iterative upgrade of technology, especially the breakthrough in the application of ultra-low temperature technology of air source heat pumps, air source heat pump products have better application prospects. However, the use of air energy itself cannot avoid the hot weather in summer and the extremely cold and low temperature environment in winter. In the above environment, the operation of air source heat pumps has the disadvantages of low energy efficiency and high energy consumption.

[0004] In the application of renewable energy, solar energy, as a basic energy source, has the advantage of being inexhaustible, but it also has the disadvantages of being intermittent and unstable, which makes it impossible to use solar energy alone in the actual heating process. It needs to be used in a complementary manner with other stable energy sources.

[0005] Geothermal energy has great development potential. The applied product is water-source heat pump, which utilizes the ground source temperature which is basically constant all year round. Its characteristics are that both cooling and heating are very energy-efficient. However, it is inseparable from the underground collection of ground source energy. The current collection method makes the application of geothermal energy have the defect of high system cost. For example, water sources such as rivers and lakes, sewage sources and industrial heat recovery generally have low energy quality, which requires heat pumps to improve utilization, resulting in high costs. Summary of the invention

[0006] The present invention provides a hot and cold water unit with complementary and composite utilization of air source and multiple energy sources. It utilizes a composite air source heat pump system of multiple clean and low-grade energy sources to directly participate in the operation of cooling and heating systems, improve the operating conditions of the air source heat pump system, and improve energy efficiency. While achieving the purpose of energy saving, the unit generates hot and cold water to supply buildings, and dissipates cold and heat through terminal equipment to achieve the purpose of high-quality cooling and heating around the clock.

[0007] The objective of the present invention is achieved through the following technical solutions:

[0008] A hot and cold water unit with complementary and composite utilization of air source and multiple energy sources, comprising a shell, characterized in that a partition is arranged in the shell to divide the space in the shell into an upper space of the unit and a lower space of the unit; an air inlet, an air source heat exchange coil, a fan and an air outlet are arranged in the upper space of the unit from left to right; a compressor, a complementary energy heat exchanger 1, a complementary energy heat exchanger 2 and a user-side heat exchanger are arranged in the lower space of the unit;

[0009] A complementary energy water inlet and a complementary energy water outlet are provided on the shell, and a pipeline is connected from the complementary energy water inlet to the complementary energy heat exchanger 1 and the complementary energy heat exchanger 2, and a pipeline is connected from the complementary energy heat exchanger 1 and the complementary energy heat exchanger 2 to the complementary energy water outlet;

[0010] The shell is provided with a unit cold and hot water outlet and a unit cold and hot water inlet, and a pipeline is connected from the unit cold and hot water inlet to the user-side heat exchanger, and a pipeline is connected from the user-side heat exchanger to the unit cold and hot water outlet;

[0011] A four-way valve is connected in the compressor refrigerant pipeline, and the complementary energy heat exchanger 1, the air source heat exchange coil, the complementary energy heat exchanger 2, and the user-side heat exchanger are sequentially connected from the four-way valve, and the user-side heat exchanger is connected to the four-way valve to form a refrigerant working fluid circulation loop; and a throttling expansion valve is arranged in the pipeline between the complementary energy heat exchanger 2 and the user-side heat exchanger.

[0012] Furthermore, the fan is an axial flow fan.

[0013] Furthermore, the air source heat exchanger coil is of finned pipe type.

[0014] Furthermore, the complementary energy water inlet and the complementary energy water outlet are each set at one place, and the water medium pipelines of the complementary energy heat exchanger 1 and the complementary energy heat exchanger 2 are connected in parallel.

[0015] At the same time, the present invention also provides a working method of the above-mentioned cold and hot water unit with complementary and composite utilization of air source and multiple energy sources, comprising the following steps:

[0016] When used for refrigeration, the refrigerant compressed by the compressor is a high-temperature and high-pressure gas. It enters the refrigerant side of the complementary energy heat exchanger 1 through the four-way valve. After exchanging heat with the complementary energy water on the other side, the temperature is reduced. Then it enters the upper end of the air source heat exchange coil. After heat exchange with the air source pulled by the fan in the air source heat exchange coil, it is cooled and condensed again to form a high-pressure and low-temperature liquid state medium. It enters the refrigerant side of the complementary energy heat exchanger 2, exchanges heat with the complementary energy water on the other side to achieve supercooling. After passing through the throttling expansion valve, it enters the refrigerant side of the user side heat exchanger as a low-temperature and low-pressure state medium, exchanges heat with the water medium entering the unit's cold and hot water inlet, and the low-temperature cold water output from the unit's cold and hot water outlet is input to the building's end heat dissipation equipment to achieve the purpose of refrigeration. After heat exchange on the refrigerant side of the user side heat exchanger, the refrigerant changes from a low-temperature and low-pressure liquid to a low-temperature and low-pressure gas, passes through the four-way valve and enters the compressor. Through the mechanical work of the compressor, it is compressed into a high-pressure gas, forming a cycle.

[0017] When used for heating, the high-temperature and high-pressure gaseous refrigerant entering the heat exchanger on the user side releases heat through the switching of the four-way valve, heating the water medium on the other side entering from the cold and hot water inlet of the unit and exiting from the cold and hot water outlet of the unit, and providing hot water for building heating or domestic hot water use; at the same time, the refrigerant that releases heat is condensed into a high-pressure and low-temperature liquid state, and enters the complementary energy heat exchanger 2 through the throttling expansion valve, absorbs the heat of the complementary energy water on the other side, and the temperature rises, and then enters the lower end of the air source heat exchange coil to continue evaporating, and after heat exchange and heat absorption with the air source pulled by the fan in the air source heat exchange coil, it becomes a low-temperature and low-pressure gas, enters the complementary energy heat exchanger 1, absorbs the heat of the complementary energy water on the other side, and after the temperature and enthalpy are increased, it is sucked into the compressor through the four-way valve, compressed into a high-temperature and high-pressure gas by the compressor doing work, and then transported to the upper end of the heat exchanger on the user side through the four-way valve to continue releasing heat, completing the whole cycle.

[0018] Beneficial effects of the present invention:

[0019] In the present invention, during the refrigeration operation, the complementary energy water in the complementary energy heat exchanger 1 and the complementary energy heat exchanger 2 can be groundwater, or it can be water from rivers, lakes, and low-grade cold water from various energy sources such as direct evaporation cooling water from cooling towers; the complementary energy water is a low-grade water source with a higher temperature than the ambient temperature, and can be shallow surface water, water from rivers, lakes, and complementary energy water formed by various energy sources such as solar energy hot water collection.

[0020] By utilizing a variety of convenient and appropriate energy sources in the form of low-grade water, it complements and compounds with a stable air source, directly participates in the operation of the unit system, and improves the working conditions of the air source heat pump, so that the unit not only has energy-saving advantages under normal climatic conditions, but also shows its working stability and energy-saving properties in the hot weather in summer or the low temperature environment in winter. The four-way valve switches the flow direction of the working fluid to achieve the conversion of cooling and heating conditions and generate hot and cold water; the unit can operate reliably and stably in various environments, achieving the goal of efficient energy-saving cooling and heating of buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the present invention;

[0022] In the figure: In the figure: 1. Shell; 2. Air source heat exchange coil; 3. Fan; 4. Air inlet; 5. Air outlet; 6. Compressor; 7. User-side heat exchanger; 8. Unit cold and hot water outlet; 9. Unit cold and hot water inlet; 10. Throttling expansion valve; 11. Complementary energy water inlet; 12. Complementary energy water outlet; 13. Four-way valve; 14. Partition; 15. Complementary energy heat exchanger 1; 16. Complementary energy heat exchanger 2; A. Upper space of the unit; B. Lower space of the unit. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further explained below through specific implementation methods.

[0024] Example 1

[0025] A hot and cold water unit utilizing air source and multiple energy sources in a complementary and combined manner, comprising a housing 1, characterized in that:

[0026] A partition 14 is provided in the shell to divide the space in the shell into an upper space A of the unit and a lower space B of the unit; an air inlet 4, an air source heat exchange coil 2, a fan 3 and an air outlet 5 are sequentially provided in the upper space A of the unit, the air source heat exchanger coil 2 is a fin-pipe type fin and air heat exchange, and a refrigerant medium flows in the pipe; the fan 3 is an axial flow fan; a compressor 6, a complementary energy heat exchanger 1 15, a complementary energy heat exchanger 2 16 and a user-side heat exchanger 7 are provided in the lower space;

[0027] The complementary energy heat exchanger 15, complementary energy heat exchanger 2 16 and the user side heat exchanger 7 are all in the form of heat exchange between the water medium on one side and the refrigerant working medium on the other side; the water medium side of the user side heat exchanger 7 is the cold and hot water finally produced by the unit, which is connected to the indoor terminal application;

[0028] A complementary energy water inlet 11 and a complementary energy water outlet 12 are provided on the shell, and a pipeline is connected from the complementary energy water inlet 11 to the complementary energy heat exchanger 1 15 and the complementary energy heat exchanger 2 16, and a pipeline is connected from the complementary energy heat exchanger 1 15 and the complementary energy heat exchanger 2 16 to the complementary energy water outlet 12; and the complementary energy water inlet 11 is arranged at a position lower than the complementary energy water outlet 12; the complementary energy water inlet 11 and the complementary energy water outlet 12 are arranged at one place each, and the water medium pipelines of the complementary energy heat exchanger 1 15 and the complementary energy heat exchanger 2 16 are connected in parallel;

[0029] The shell is provided with a unit cold and hot water outlet 8 and a unit cold and hot water inlet 9, a pipeline is connected from the unit cold and hot water inlet 9 to the user-side heat exchanger 7, and a pipeline is connected from the user-side heat exchanger 7 to the unit cold and hot water outlet 8; and the unit cold and hot water outlet 8 is arranged at a position higher than the unit cold and hot water inlet 9;

[0030] In the refrigerant pipeline of the compressor 6, a four-way valve 13 is connected, and the complementary energy heat exchanger 1 15, the air source heat exchange coil 2, the complementary energy heat exchanger 2 16, and the use-side heat exchanger 7 are connected in sequence from the four-way valve 13, and the four-way valve 13 is connected from the use-side heat exchanger 7 to form a refrigerant working medium circulation loop; and a throttling expansion valve 10 is arranged in the pipeline between the complementary energy heat exchanger 2 16 and the use-side heat exchanger 7.

[0031] Example 2

[0032] The working method of the cold and hot water unit with complementary and composite utilization of air source and multiple energy sources in Example 1 comprises the following steps:

[0033] When used for refrigeration, the refrigerant compressed by the compressor 6 is a high-temperature and high-pressure gas. It enters the refrigerant side of the complementary energy heat exchanger 15 through the four-way valve 13, exchanges heat with the complementary energy water on the other side, and then the temperature is reduced. Then it enters the upper end of the air source heat exchange coil 2, exchanges heat with the air source pulled by the fan 3 in the air source heat exchange coil 2, and is cooled and condensed again to form a high-pressure and low-temperature liquid state medium. It enters the refrigerant side of the complementary energy heat exchanger 2 16, exchanges heat with the complementary energy water on the other side, and achieves supercooling. The refrigerant medium in the user side heat exchanger 7 is in a low-temperature and low-pressure state, and enters the refrigerant medium side of the user side heat exchanger 7 through the throttling expansion valve 10, and exchanges heat with the water medium entering the cold and hot water inlet 9 of the unit. The low-temperature cold water output from the cold and hot water outlet 8 of the unit is input to the heat dissipation equipment at the end of the building to achieve the purpose of refrigeration; after the refrigerant medium in the user side heat exchanger 7 exchanges heat, the refrigerant medium changes from a low-temperature and low-pressure liquid to a low-temperature and low-pressure gas, and enters the compressor 6 through the four-way valve 13. Through the mechanical work of the compressor 6, it is compressed into a high-temperature and high-pressure gas for output, forming a cycle;

[0034] When used for heating, the high-temperature and high-pressure gaseous refrigerant working medium entering the use-side heat exchanger 7 releases heat through the switching of the four-way valve 13, and heats the water medium on the other side entering from the unit's hot and cold water inlet 9 and exiting from the unit's hot and cold water outlet 8, forming hot water for building heating or domestic hot water use; at the same time, the refrigerant working medium that releases heat is condensed into a high-pressure and low-temperature liquid state, and enters the complementary energy heat exchanger 2 16 through the throttling expansion valve 10, absorbs the heat of the complementary energy water on the other side, and the temperature rises, and then enters the lower end of the air source heat exchange coil 2, continues to evaporate, and after heat exchange and heat absorption with the air source pulled by the fan 3 in the air source heat exchange coil 2, becomes a low-temperature and low-pressure gas, enters the complementary energy heat exchanger 1 15, absorbs the heat of the complementary energy water on the other side, and after the temperature and enthalpy are increased, it is sucked into the compressor 6 through the four-way valve 13, and is compressed into a high-temperature and high-pressure gas after the compressor 6 does work, and then is transported to the upper end of the use-side heat exchanger 7 through the four-way valve, and continues to release heat to complete the whole cycle.

Claims

1. A hot and cold water unit with complementary utilization of air source and multiple energy sources, comprising a shell, characterized in that: A partition is provided in the shell to divide the space in the shell into an upper space of the unit and a lower space of the unit; an air inlet, an air source heat exchange coil, a fan and an air outlet are provided in the upper space of the unit from left to right; a compressor, a complementary energy heat exchanger 1, a complementary energy heat exchanger 2 and a user-side heat exchanger are provided in the lower space of the unit; A complementary energy water inlet and a complementary energy water outlet are provided on the shell, and a pipeline is connected from the complementary energy water inlet to the complementary energy heat exchanger 1 and the complementary energy heat exchanger 2, and a pipeline is connected from the complementary energy heat exchanger 1 and the complementary energy heat exchanger 2 to the complementary energy water outlet; The shell is provided with a unit cold and hot water outlet and a unit cold and hot water inlet, and a pipeline is connected from the unit cold and hot water inlet to the user-side heat exchanger, and a pipeline is connected from the user-side heat exchanger to the unit cold and hot water outlet; A four-way valve is connected to the compressor refrigerant pipeline, and the complementary energy heat exchanger 1, the air source heat exchange coil, the complementary energy heat exchanger 2, and the user-side heat exchanger are sequentially connected from the four-way valve, and the user-side heat exchanger is connected to the four-way valve to form a refrigerant working medium circulation loop; and a throttling expansion valve is arranged in the pipeline between the complementary energy heat exchanger 2 and the user-side heat exchanger; The fan is an axial flow fan; The air source heat exchanger coil is of finned pipe type; The complementary energy water inlet and the complementary energy water outlet are each arranged at one place, and the water medium pipelines of the complementary energy heat exchanger 1 and the complementary energy heat exchanger 2 are connected in parallel.

2. A method for operating a hot and cold water unit with complementary and combined utilization of air source and multiple energy sources according to claim 1, characterized in that: The steps include: When used for refrigeration, the refrigerant compressed by the compressor is a high-temperature and high-pressure gas. It enters the refrigerant side of the complementary energy heat exchanger 1 through the four-way valve. After exchanging heat with the complementary energy water on the other side, the temperature is reduced. Then it enters the upper end of the air source heat exchange coil. After heat exchange with the air source pulled by the fan in the air source heat exchange coil, it is cooled and condensed again to form a high-pressure and low-temperature liquid state medium. It enters the refrigerant side of the complementary energy heat exchanger 2, exchanges heat with the complementary energy water on the other side to achieve supercooling. After passing through the throttling expansion valve, it enters the refrigerant side of the user side heat exchanger as a low-temperature and low-pressure state medium, exchanges heat with the water medium entering the cold and hot water inlet of the unit, and the low-temperature cold water output from the cold and hot water outlet of the unit is input to the heat dissipation equipment at the end of the building to achieve the purpose of refrigeration. After heat exchange on the refrigerant side of the user side heat exchanger, the refrigerant changes from a low-temperature and low-pressure liquid to a low-temperature and low-pressure gas. It enters the compressor through the four-way valve and is compressed into a high-temperature and high-pressure gas through the mechanical work of the compressor. Form a cycle; When used for heating, the high-temperature and high-pressure gaseous refrigerant entering the heat exchanger on the user side releases heat through the switching of the four-way valve, heating the water medium on the other side entering from the cold and hot water inlet of the unit and exiting from the cold and hot water outlet of the unit, and providing hot water for building heating or domestic hot water use; at the same time, the refrigerant that releases heat is condensed into a high-pressure and low-temperature liquid state, and enters the complementary energy heat exchanger 2 through the throttling expansion valve, absorbs the heat of the complementary energy water on the other side, and the temperature rises, and then enters the lower end of the air source heat exchange coil to continue evaporating, and after heat exchange and heat absorption with the air source pulled by the fan in the air source heat exchange coil, it becomes a low-temperature and low-pressure gas, enters the complementary energy heat exchanger 1, absorbs the heat of the complementary energy water on the other side, and after the temperature and enthalpy are increased, it is sucked into the compressor through the four-way valve, compressed into a high-temperature and high-pressure gas by the compressor doing work, and then transported to the upper end of the heat exchanger on the user side through the four-way valve to continue releasing heat, completing the whole cycle.

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