Fuel heat pump system with high efficiency defrosting and operation method thereof

Abstract

The invention relates to the field of air conditioners, and provides a fuel heat pump system with high efficiency defrosting and an operation method thereof. The system comprises a fuel heat pump unit, a waste heat supply unit and a defrosting unit, wherein the fuel heat pump unit comprises a fuel engine, a heat pump unit driven by the fuel engine, at least two air cooling modules and a user; thewaste heat supply unit comprises a cylinder sleeve of the fuel engine and a first flue gas heat exchanger; the defrosting unit comprises a second flue gas heat exchanger and an anti-freezing solutionbox comprising a heat supplementing heat exchanger; and low-grade waste heat in the flue gas is recovered at the second flue gas heat exchanger for defrosting of an air-cooled heat exchanger. The system includes three modes of operation: a normal heating mode, a defrosting heating mode, a supplementary heat and defrosting heating mode. According to the system, the recovered low-grade flue gas waste heat containing a large amount of latent heat is used for defrosting of the air-cooled heat exchanger, and the heating capacity and system energy efficiency ratio of the heat pump system can be effectively improved.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to a high-efficiency defrosting fuel heat pump system and an operating method thereof. Background technique [0002] The fuel heat pump system uses the fuel engine to drive the compressor of the heat pump unit. On the one hand, the heat pump unit can be used to obtain heat from the low-temperature environment to provide heating to the user. Residual heat for heating. Therefore, the system has excellent heating performance. [0003] However, when the air source heat pump unit driven by a fuel engine operates in an environment with low temperature and high humidity, the outdoor air-cooled heat exchanger has serious frosting phenomenon, which leads to a decrease in energy efficiency of the system, a decrease in heating capacity, and even malfunction. run. If traditional defrosting methods such as refrigerant reverse circulation are used, the heat for defrosting will be extracted from...

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Problems solved by technology

However, the invention patent still has the following deficiencies: (1) The heat used for defrosting all comes from the high-temperature hot water on the heating side of the user, which has a waste of energy grade and affects the heating effect of the user; (2) The waste heat of the flue gas is not sufficient Recycling, the temperature and moisture content of the flue gas after recovery of high-temperature sensible heat are still high, and there is still a large amount of latent heat that has not been recycled

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