Total heat recovery air-source heat pump system with solar energy-rock and soil energy as low-grade heat source

Abstract

The invention discloses a total heat recovery air-source heat pump system with the solar energy-rock and soil energy as a low-grade heat source. The total heat recovery air-source heat pump system comprises a ground heat exchanger, a solar thermal collector, a low-temperature water tank, an evaporator, a condenser, a heat recovery heat exchange device and a compressor. Heat exchange coils are arranged in the low-temperature water tank, the evaporator and the heat recovery heat exchange device correspondingly. The heat exchange coil of the low-temperature water tank is connected with the ground heat exchanger through a pipeline. The low-temperature water tank is connected with the heat exchange coil of the evaporator through pipelines. The evaporator is sequentially connected with the compressor and the heat recovery heat exchange device through pipelines, and then the compressor and the heat recovery heat exchange device are connected back to the evaporator through a throttling valve to form a loop. An air-cooled condenser is arranged between the pipeline connected with the compressor and a pipeline connected with the throttling valve. The two ends of the solar thermal collector are connected to a pipeline enabling a water outlet of the heat exchange coil of the low-temperature water tank to be connected with a water inlet of the ground heat exchanger through three-way valves correspondingly. By adoption of the total heat recovery air-source heat pump system with the solar energy-rock and soil energy as the low-grade heat source, the problems that the energy efficiency is low and frosting is prone to occurring when an air-source heat pump unit operates in a cold region in winter are solved.

Description

technical field [0001] The invention relates to the improvement of heat supply technology, in particular to a total heat recovery air source heat pump system using solar energy-rock soil energy as a low-level heat source, which belongs to the technical field of heat exchange. Background technique [0002] At present, common indoor heating and cooling needs are often carried out by the same system, and the most typical one is the current common cold and hot integrated air conditioner, whose structure is shown in Figure 5 . In the summer cooling mode, the liquid refrigerant in the evaporator 5 absorbs the heat of the air and undergoes a phase change to become a low-temperature and low-pressure gaseous refrigerant. After passing through the compressor 9, it becomes a high-temperature and high-pressure liquid refrigerant, and then passes through the condenser. 6 exchanges heat with the atmosphere to obtain liquid refrigerant with reduced temperature and flows back to the evapor...

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Problems solved by technology

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to propose a full heat recovery air source heat pump system using solar energy-rock-soil energy as a

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