Heat pump system with high energy efficiency

Abstract

A heat pump system with high energy efficiency comprises a compressor, a condenser, a throttling valve, an evaporator, a gas-liquid separator and a heat pump working medium, an outlet of the compressor is communicated with a heat pump working medium inlet of the condenser through a pipeline, and a heat pump working medium outlet of the condenser is connected with a first inlet of a heat exchanger through a pipeline. A first outlet of the heat exchanger is connected with a heat pump working medium inlet of the evaporator through a throttling valve, a heat pump working medium outlet of the evaporator is connected with a second inlet of the heat exchanger through a pipeline, a second outlet of the heat exchanger is connected with an inlet of the gas-liquid separator through a pipeline, and a gas outlet of the gas-liquid separator is connected with an inlet of the compressor through a pipeline. The medium-temperature high-pressure heat pump working medium liquid output by the condenser and the low-temperature low-pressure heat pump working medium gas output by the evaporator are subjected to heat exchange through the heat exchanger, compared with a traditional heat pump system, the overall energy efficiency of the heat pump system is improved, the energy-saving effect is achieved, and the strategic targets of'carbon neutralization 'and'carbon peak reaching' are achieved in an assisting mode.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchange, and particularly relates to a high-efficiency heat pump system. Background Art

[0002] The heat pump unit uses the evaporation-condensation cycle to complete the transfer of heat. In the evaporator, the low-temperature and low-pressure heat pump working medium absorbs heat from the heat source and evaporates into a gas, and then enters the compressor to be compressed, increasing its temperature and pressure to become a high-temperature and high-pressure heat pump working medium gas. Then, it releases heat through the condenser and condenses into a liquid. In this process, the heat of the heat pump working medium is transferred to the medium to be heated, realizing the transfer of heat.

[0003] The low-temperature and low-pressure heat pump working medium is separated by a gas-liquid separator to obtain a low-temperature and low-pressure heat pump working medium gas, which is then compressed by the compressor into a high-temperature and high-pressure working medium gas. After passing through the condenser, a medium-temperature and high-pressure heat pump working medium liquid is generated. After passing through a throttling and expansion component, a low-temperature and low-pressure heat pump working medium liquid is generated, starting the next cycle. And in this process, if the heat of the medium-temperature and high-pressure working medium liquid can be reused by the heat pump system, the comprehensive energy efficiency of the heat pump unit can be improved. Therefore, there is an urgent need for a heat pump system that can utilize the heat of the medium-temperature and high-pressure working medium liquid. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the shortcomings of the prior art and provide a high-efficiency heat pump system with reasonable design and high heat energy utilization rate.

[0005] The technical solution adopted to solve the above technical problem is: a high-efficiency heat pump system, including a compressor, a condenser, a throttle valve, an evaporator, a gas-liquid separator, and a heat pump working medium. The outlet of the compressor is connected to the heat pump working medium inlet of the condenser through a pipeline. The heat pump working medium outlet of the condenser is connected to the first inlet of a heat exchanger through a pipeline. The first outlet of the heat exchanger is connected to the heat pump working medium inlet of the evaporator through a throttle valve. The heat pump working medium outlet of the evaporator is connected to the second inlet of the heat exchanger through a pipeline. The second outlet of the heat exchanger is connected to the inlet of the gas-liquid separator through a pipeline. The gas outlet of the gas-liquid separator is connected to the inlet of the compressor through a pipeline;

[0006] In the condenser, the high-temperature and high-pressure heat pump working medium gas exchanges heat with the heat-carrying medium on the high-temperature side, heating the heat-carrying medium while condensing the high-temperature and high-pressure heat pump working medium gas into a medium-temperature and high-pressure heat pump working medium liquid;

[0007] In the evaporator, the low-temperature and low-pressure heat pump working medium liquid exchanges heat with the heat-carrying medium on the low-temperature side, cooling the heat-carrying medium while heating the low-temperature and low-pressure heat pump working medium liquid into a low-temperature and low-pressure heat pump working medium gas; [[ID=2,6]]

[0008] The medium-temperature and high-pressure heat pump working fluid liquid output by the condenser in the heat exchanger exchanges heat with the low-temperature and low-pressure heat pump working fluid gas output by the evaporator. The output medium-temperature and low-pressure heat pump working fluid gas enters the gas-liquid separator, and the output low-temperature and medium-pressure heat pump working fluid liquid enters the throttle valve.

[0009] As a preferred technical solution, a gate valve is provided between the heat pump working fluid outlet of the evaporator and the inlet of the gas-liquid separator.

[0010] As a preferred technical solution, the heat exchanger is a double-pipe heat exchanger.

[0011] The beneficial effects of the present utility model are as follows:

[0012] In the present utility model, the medium-temperature and high-pressure heat pump working fluid liquid output by the condenser and the low-temperature and low-pressure heat pump working fluid gas output by the evaporator are heat-exchanged through the heat exchanger. Compared with the traditional heat pump system, the overall energy efficiency of the heat pump system is improved. At the same time, the temperature of the working fluid liquid entering the throttle valve is reduced, reducing the thermal shock and loss to the throttle valve, thereby extending the service life of the throttle valve. Also, the temperature of the working fluid gas entering the compressor is increased, reducing the work done by the compressor, thereby reducing the power consumption of the equipment.

[0013] The present utility model is reasonably designed, reducing the loss of key components, achieving energy-saving effects, helping to reduce energy consumption, lowering operation and maintenance costs, helping to reduce greenhouse gas emissions, and supporting the environmental protection strategic goals of "carbon neutrality" and "carbon peak". Description of the Drawings

[0014] Figure 1 is the structural schematic diagram of the present utility model.

[0015] Figure 2 is the heat exchange principle diagram of the heat exchanger.

[0016] Wherein: condenser 1, heat exchanger 2, throttle valve 3, evaporator 4, electric valve 5, gas-liquid separator 6, compressor 7. Detailed Embodiments

[0017] The following further describes the present utility model in detail with reference to the drawings and embodiments, but the present utility model is not limited to the following embodiments.

[0018] In Figure 1 、 2In the high-efficiency heat pump system of this embodiment, it includes a compressor 7, a condenser 1, a throttle valve 3, an evaporator 4, a gas-liquid separator 6, and a heat pump working medium. The compressor 7 is used to convert the medium-temperature and low-pressure heat pump working medium gas in the pipeline into a high-temperature and high-pressure heat pump working medium gas, and at the same time provide power for the circulation of the heat pump working medium. The outlet of the compressor 7 is connected to the heat pump working medium inlet of the condenser 1 through a pipeline, and the heat pump working medium outlet of the condenser 1 is connected to the first inlet of the heat exchanger 2 through a pipeline. The high-temperature and high-pressure heat pump working medium gas in the condenser 1 exchanges heat with the heat-carrying medium on the high-temperature side to heat the heat-carrying medium, and at the same time condenses the high-temperature and high-pressure heat pump working medium gas into a medium-temperature and high-pressure heat pump working medium liquid. The medium-temperature and high-pressure heat pump working medium liquid enters the heat exchanger 2, and the heat-carrying medium circulates with the high-temperature side.

[0019] The first outlet of the heat exchanger 2 is connected to the heat pump working medium inlet of the evaporator 4 through the throttle valve 3. The low-temperature and medium-pressure heat pump working medium liquid output by the heat exchanger 2 is converted into a low-temperature and low-pressure heat pump working medium liquid through the throttle valve 3 and enters the evaporator 4. The low-temperature and low-pressure heat pump working medium liquid in the evaporator 4 exchanges heat with the heat-carrying medium on the low-temperature side to cool the heat-carrying medium and at the same time heat the low-temperature and low-pressure heat pump working medium liquid into a low-temperature and low-pressure heat pump working medium gas. The heat pump working medium outlet of the evaporator 4 is connected to the second inlet of the heat exchanger 2 and the inlet of the gas-liquid separator 6 through a pipeline. An electric valve 5 is connected between the heat pump working medium outlet of the evaporator 4 and the inlet of the gas-liquid separator 6. The electric valve 5 is used to adjust the flow rate of the heat pump working medium in the system. The second outlet of the heat exchanger 2 is connected to the inlet of the gas-liquid separator 6 through a pipeline. The low-temperature and low-pressure heat pump working medium gas output by the evaporator 4 enters the heat exchanger 2, exchanges heat with the medium-temperature and high-pressure heat pump working medium liquid output by the condenser 1, absorbs heat and warms up to a medium-temperature and low-pressure heat pump working medium gas and then goes to the gas-liquid separator 6. The gas outlet of the gas-liquid separator 6 is connected to the inlet of the compressor 7 through a pipeline. The gas-liquid separator 6 transports the medium-temperature and low-pressure heat pump working medium gas to the compressor 7 to start the next cycle.

[0020] The heat exchanger 2 of this embodiment is a double-pipe heat exchanger.

[0021] The utility model exchanges heat between the medium-temperature and high-pressure heat pump working medium liquid output by the condenser 1 and the low-temperature and low-pressure heat pump working medium gas output by the evaporator 4 through the heat exchanger 2, reduces the temperature of the working medium liquid entering the throttle valve 3, reduces the loss of the throttle valve 3, extends its service life, increases the temperature of the working medium gas entering the compressor 7, reduces the work done by the compressor 7, reduces the power consumption of the equipment, and achieves the effect of energy conservation, contributing to the strategic goals of "carbon neutrality" and "carbon peak".

[0022] The utility model can be used as both a refrigeration system and a heating system. When used as a refrigeration system, the evaporator outputs low temperature externally and the condenser inputs high temperature externally, achieving heat extraction from the high-temperature side; when used as a heating system, the evaporator inputs low temperature externally and the condenser outputs high temperature externally, achieving heat extraction from the low-temperature side; the utility model can simultaneously achieve combined cooling and heating supply, with one device having two functions.

Claims

1. An energy-efficient heat pump system, characterized in that: It includes a compressor, a condenser, a throttle valve, an evaporator, a gas-liquid separator, and a heat pump working medium. The outlet of the compressor is connected to the inlet of the heat pump working medium of the condenser through a pipeline. The outlet of the heat pump working medium of the condenser is connected to the first inlet of the heat exchanger through a pipeline. The first outlet of the heat exchanger is connected to the inlet of the heat pump working medium of the evaporator through a throttle valve. The outlet of the heat pump working medium of the evaporator is connected to the second inlet of the heat exchanger through a pipeline. The second outlet of the heat exchanger is connected to the inlet of the gas-liquid separator through a pipeline. The gas outlet of the gas-liquid separator is connected to the inlet of the compressor through a pipeline; In the condenser, the high-temperature and high-pressure heat pump working medium gas exchanges heat with the heat-carrying medium on the high-temperature side, heating the heat-carrying medium and condensing the high-temperature and high-pressure heat pump working medium gas into a medium-temperature and high-pressure heat pump working medium liquid; In the evaporator, the low-temperature and low-pressure heat pump working medium liquid exchanges heat with the heat-carrying medium on the low-temperature side, cooling the heat-carrying medium and heating the low-temperature and low-pressure heat pump working medium liquid into a low-temperature and low-pressure heat pump working medium gas; In the heat exchanger, the medium-temperature and high-pressure heat pump working medium liquid output from the condenser exchanges heat with the low-temperature and low-pressure heat pump working medium gas output from the evaporator, outputting a medium-temperature and low-pressure heat pump working medium gas into the gas-liquid separator and outputting a low-temperature and medium-pressure heat pump working medium liquid into the throttle valve.

2. The high-efficiency heat pump system according to claim 1, characterized in that: A gate valve is provided between the outlet of the heat pump working medium of the evaporator and the inlet of the gas-liquid separator.

3. The high energy efficiency heat pump system according to claim 1, wherein: The heat exchanger is a double-pipe heat exchanger.

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