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1. (WO2018045507) AIR-SOURCE TWO-STAGE HEAT-PUMP AIR-CONDITIONING SYSTEM

Pub. No.:    WO/2018/045507    International Application No.:    PCT/CN2016/098307
Publication Date: Fri Mar 16 00:59:59 CET 2018 International Filing Date: Thu Sep 08 01:59:59 CEST 2016
IPC: F25B 7/00
F25B 29/00
Applicants: XU, Shengheng
徐生恒
Inventors: XU, Shengheng
徐生恒
Title: AIR-SOURCE TWO-STAGE HEAT-PUMP AIR-CONDITIONING SYSTEM
Abstract:
An air-source two-stage heat-pump air-conditioning system comprises: a first loop, consisting of an outdoor low-temperature evaporator (5), a liquid storage tank (8), a low-temperature compressor (1), an indoor low-temperature condenser (2), a first path of a heat exchanger (3) and a first expansion valve (4) that are sequentially connected; and a second loop, consisting of a high-temperature compressor (6), an indoor high-temperature condenser (10), a second expansion valve (7) and a second path of the heat exchanger (3) that are sequentially connected. A buffer tank (9) is disposed between the high-temperature compressor (6) and the indoor high-temperature condenser (10), and one indoor low-temperature condenser (2) and one indoor high-temperature condenser (10) form a first set of indoor condensers. The air-source two-stage heat-pump air-conditioning system uses air as energy, supplies heat to a living room in winter, can also perform refrigeration for the living room in summer after a two-position four-way change valve is mounted, has a high energy efficiency, is simple to mount and is convenient to use. The device has no water path in operation, is resistant to a low temperature, and is safer and more reliable.