JP2015152205A5

JP2015152205A5 -

Info

Publication number: JP2015152205A5
Application number: JP2014025266A
Authority: JP
Filing date: 2014-02-13
Publication date: 2016-08-04
Anticipated expiration: 2034-02-13

Description

また、空気調和装置に過冷却熱交換器、過冷却バイパス回路及び過冷却膨張弁を設け、除霜運転時に、前記過冷却膨張弁の開度を圧縮機吐出ガス過熱度に応じて制御することにより、圧縮機の運転信頼性を維持しつつ、アキュムレータに冷媒液をより多く戻すことが可能となる。この結果、圧縮機にかわき度の小さい冷媒を供給することができ、圧縮機に保有されている熱容量をより多く抽出して除霜熱源として利用することができる。このため、圧縮機に保有されている熱容量と、圧縮機で消費される電気入力量の二つの熱源を、室外熱交換器に付着した霜の融解熱として最大限利用することができ、除霜運転時間の短縮を図ることができる。
In addition, a supercooling heat exchanger, a supercooling bypass circuit, and a supercooling expansion valve are provided in the air conditioner, and the opening degree of the supercooling expansion valve is controlled according to the degree of compressor discharge gas superheat during defrosting operation. This makes it possible to return more refrigerant liquid to the accumulator while maintaining the operation reliability of the compressor. As a result, it is possible to supply a refrigerant with a small degree of cuteness to the compressor, extract more heat capacity retained in the compressor, and use it as a defrost heat source. For this reason, the two heat sources of the heat capacity possessed by the compressor and the amount of electric input consumed by the compressor can be utilized to the maximum extent as the melting heat of the frost adhering to the outdoor heat exchanger. The operation time can be shortened.

Claims

It is an air conditioning apparatus of Claim 3, Comprising:
The outdoor unit includes a liquid blocking valve on the refrigerant liquid piping side connecting the outdoor unit and the indoor unit, a gas blocking valve on the refrigerant gas piping side connecting the outdoor unit and the indoor unit,
A supercooling heat exchanger that is provided in the middle of a pipe connecting the outdoor expansion valve and the liquid blocking valve and exchanges heat between the refrigerant flowing through the main flow portion and the refrigerant flowing through the subflow portion;
The subcooling is branched from the middle of the pipe connecting the outdoor expansion valve and the liquid blocking valve, and is bypassed to the refrigerant pipe connecting the switching valve and the accumulator after passing through the subflow portion of the supercooling heat exchanger. A bypass circuit;
A supercooling expansion valve provided on the upstream side of the supercooling heat exchanger in the supercooling bypass circuit,
The air conditioning apparatus, wherein the supercooling expansion valve is controlled according to a degree of superheat of refrigerant discharged from the compressor.