Title:
HEAT PUMP USING CASCADE CYCLE
Document Type and Number:
WIPO Patent Application WO/2017/026736
Kind Code:
A1
Abstract:
The present invention relates to a heat pump using a cascade cycle, comprising: a low-stage refrigeration cycle in which a first refrigerant circulates along a first circuit comprising a first compressor, a first heat exchanger, a first expansion valve, and a first evaporator; a high-stage refrigeration cycle in which a second refrigerant circulates along a second circuit comprising a second compressor, a second heat exchanger, a second expansion valve, and the first heat exchanger; a bifurcated flow path which is bifurcated between the second expansion valve and the first heat exchanger and is connected between the first heat exchanger and the second compressor; a valve which allows the second refrigerant to pass through the bifurcated flow path or shuts off the second refrigerant; a second evaporator disposed on the bifurcated flow path; and a controller, wherein, when outside temperature is equal to or greater than a predetermined temperature, and heating load is not large, only the high-stage refrigeration cycle is operated, thereby reducing power consumption.
Inventors:
LEE DONG KEUN (KR)
PARK JI HOON (KR)
PARK JI HOON (KR)
Application Number:
PCT/KR2016/008584
Publication Date:
February 16, 2017
Filing Date:
August 04, 2016
Export Citation:
Assignee:
KYUNGDONG NAVIEN CO LTD (KR)
International Classes:
F25B30/02; F25B7/00; F25B39/02; F25B41/04; F25B49/02; F28D9/00; F28D20/00; F28F1/32
Foreign References:
| KR20120125857A | 2012-11-19 | |||
| JP5492347B2 | 2014-05-14 | |||
| KR20050106260A | 2005-11-09 | |||
| JP2009002610A | 2009-01-08 | |||
| KR20140128694A | 2014-11-06 |
Attorney, Agent or Firm:
CHO, Chul Hyun (KR)
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