Continuous heating phase change energy storage cascade air source heat pump system and operation method

Abstract

The invention relates to a continuous heating phase change energy storage cascade air source heat pump system and its operation method. The cascade air source heat pump technology is combined with the phase change energy storage technology, and the phase change heat storage is used as the defrosting and cooling system. The low-level heat source for indoor heating ensures the stability and reliability of the defrosting operation of the cascade air source heat pump. The variable heat accumulator provides enough heat during the defrosting process, which can increase the defrosting speed; since the heat pump stores heat during high-efficiency operation, when defrosting is required, the stored heat is used for defrosting and heating, realizing The time-space transfer of energy improves the overall operating efficiency of the unit.

Description

technical field

[0001] The invention relates to a heat supply system, in particular to a continuous heat supply phase change energy storage cascade air source heat pump system and an operating method. Background technique

[0002] When the air source heat pump unit is used in the low temperature environment in winter in the northern region, the heating capacity will drop sharply, the exhaust temperature will exceed the limit, and the compressor will stop for protection and other problems. The cascade air source heat pump can achieve the purpose of improving the low temperature adaptability of the air source heat pump and improving its low temperature heating performance. Like conventional air source heat pumps, when the surface temperature of the outdoor unit is lower than the air dew point and lower than the freezing point during the heating operation of the cascade air source heat pump, frosting will occur. Many cities in northern my country have low-temperature and high-...

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