Title:
空気調和機
Document Type and Number:
Japanese Patent JP6964803
Kind Code:
B2
Abstract:
An air-conditioning apparatus includes a refrigerant circuit in which a compressor, an indoor heat exchanger, a first expansion device, an outdoor heat exchanger, and a flow switching device are sequentially connected to each other by pipes and through which refrigerant circulates; a hot gas bypass pipe coupling a discharge port of the compressor and the flow switching device to each other; and a controller. The compressor is configured to compress and discharge the refrigerant. The indoor heat exchanger is configured to allow the refrigerant to exchange heat with indoor air. The first expansion device is configured to reduce pressure of the refrigerant. The outdoor heat exchanger includes an upper heat exchanger and a lower heat exchanger having passages in parallel with each other and is configured to allow the refrigerant to exchange heat with outdoor air. The flow switching device is configured to switch flows of the refrigerant toward the upper heat exchanger and the lower heat exchanger. The controller is configured to perform a heating-defrosting operation for alternately defrosting the upper heat exchanger and the lower heat exchanger while performing a normal heating operation. The outdoor heat exchanger includes a plurality of hairpin pipes, which are part of a heat transfer pipe. When the upper heat exchanger is defrosted, all hairpin pipes that are located at a lowermost step of the upper heat exchanger are used as refrigerant inlets. When the lower heat exchanger is defrosted, all hairpin pipes that are located at an uppermost step of the lower heat exchanger are used as refrigerant inlets.
Inventors:
Masakazu Sato
Kawashima Atsushi
Yusuke Tashiro
Yasuhide Hayamaru
Kawashima Atsushi
Yusuke Tashiro
Yasuhide Hayamaru
Application Number:
JP2020558709A
Publication Date:
November 10, 2021
Filing Date:
December 04, 2018
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
F24F1/18; F24F11/41; F25B39/02; F25B47/02
Domestic Patent References:
| JP2010139097A |
Foreign References:
| WO2016113850A1 | ||||
| WO2016117131A1 |
Attorney, Agent or Firm:
Patent Business Corporation Kisa Patent Trademark Office
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