Air source heat pump system and control method based on refrigerant supercooling heat recovery synergy

Abstract

The invention relates to an air source heat pump system and control method based on refrigerant supercooling heat recovery synergy. The air source heat pump system comprises a gas-liquid separator, a compressor, a first four-way reversing valve, a first heat exchanger, a first throttling unit, a second four-way reversing valve, a first stop valve, a second throttling unit and a third heat exchanger which are connected in sequence. A heat storage device is connected to the two ends of the first stop valve in parallel, and any one or more of the first four-way reversing valve, the second four-way reversing valve, the first stop valve and the second stop valve are adjusted, the switching of the air source heat pump system among a cold storage refrigeration state, a common refrigeration state, a cold release refrigeration state, a frostless heat storage heating mode, a frostless common heating mode and a heat storage defrosting heating mode is achieved. Compared with the prior art, supercooling heat which is difficult to utilize by a common air source heat pump is transferred across time and space and fully utilized, and the overall capacity and energy efficiency of the unit are significantly improved.

Description

technical field [0001] The invention relates to the field of air source heat pumps, in particular to an air source heat pump system and a control method based on refrigerant subcooling heat recovery efficiency enhancement. Background technique [0002] The air source heat pump is a high-efficiency heat energy lifting and transferring device based on the reverse Carnot cycle. It uses a small amount of electric energy as power and uses refrigerant as a carrier to continuously absorb low-grade heat energy in the air and convert it into usable High grade thermal energy. Due to its high energy efficiency and stable heat supply, air source heat pumps are widely used in domestic hot water production, building environment air conditioning, drying and other fields. After being cooled and condensed by the condenser, the refrigerant of the air source heat pump is usually a liquid with high pressure saturation or small subcooling degree, and the temperature is relatively high, which ha...

AI Technical Summary

Problems solved by technology

First, the system uses five solenoid valves. When switching modes, five solenoid valves need to act simultaneously to complete the system structure and control. Second, the system is only suitable for frosting of outdoor heat exchangers. The energy saving in the actual application process is very limited; third, the defrosting process of the system only uses the sensible heat of the low-pressure refrigerant gas at the outlet of the evaporator to defrost, the defrosting heat is small, and the defrosting speed Slow, and most of the heat supply of the system is used to supply heat to the room, the proportion of heat for defrosting is too small, and it is prone to problems of insufficient heat storage in the phase change heat accumulator and unclean defrosting

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