Low-temperature strong-heat air source heat pump system

Abstract

The invention provides a low-temperature strong-heat air source heat pump system. The system comprises a compressor, an air-cooled condenser, a one-way valve assembly, a flash tank, an economizer, a water side heat exchanger and a gas-liquid separator. An air suction port of the compressor is connected with the gas-liquid separator, an exhaust port of the compressor is connected with the air-cooled condenser or the water side heat exchanger through a four-way reversing valve, and an air supplement port of the compressor is connected with an air supplement loop and a liquid spraying loop. The air-cooled condenser is connected with a first-stage throttling electronic expansion valve through the one-way valve assembly; the first-stage throttling electronic expansion valve is connected with the flash tank through a drying filter A; a liquid outlet of the flash tank is connected with a main side inlet of the economizer, and an air supply port of the flash tank is connected with the air supply loop; a main side outlet of the economizer is connected with the liquid spraying loop and a second-stage throttling electronic expansion valve; and the second-stage throttling electronic expansionvalve is connected with the economizer through a drying filter B, and the second-stage throttling electronic expansion valve is connected with the water side heat exchanger or the air-cooled condenserthrough the one-way valve assembly.

Description

technical field [0001] The invention relates to the technical field of heating, ventilating and air conditioning, in particular to a low-temperature strong-heat air source heat pump system. Background technique [0002] The air source heat pump system uses low-grade air as the cold and heat source, uses refrigerant as the working medium, and is composed of four major devices: compressor, evaporator, condenser, and throttling device as the main core components. It is a form of renewable energy utilization system that works to produce cold and hot water. [0003] Nowadays, with the rapid development of the global economy, energy shortages, increased environmental pollution, and global warming have become issues of concern to the world, especially severe challenges faced by the global refrigeration and air-conditioning industry; to achieve efficient use of energy, low-carbon environmental protection, and reduced energy consumption Particularly important. Among them, the air s...

AI Technical Summary

Problems solved by technology

[0007] (1) Contradiction between heat supply and demand: the heat demanded by the building is linearly inversely proportional to the outer ring temperature, the outer ring temperature is low, the heat demand is large, and the heat loss of conventional air source heat pumps is obvious;

[0008] (2) Limitations: in severe cold areas, conventional air source heat pump systems cannot start and run normally when the ambient temperature is ≤-15°C, the ambient temperature is ≤-20°C, and the COPH is difficult to exceed 2.0 (the output water temperature is 41°C);

[0009] (3) Under the condition of high pressure ratio, the discharge temperature of the compressor keeps rising, there is a risk of overheating operation in the compression, the compressor is poorly lubricated, which affects the service life of the compressor, and the discharge temperature is high, which cannot be effectively controlled by means and methods put it within the reliable range

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