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Patent Searching and Data


Title:
HEAT PUMP DEVICE AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2018/025935
Kind Code:
A1
Abstract:
A heat pump device is equipped with a control unit (10) for controlling the rotational frequency of a high-stage compressor (9) so as to compress a refrigerant up to a target high pressure (Pd) requested by a usage-side heat exchanger (32), and controlling the rotational frequency of a low-stage compressor (7) so as to achieve a target intermediate pressure (Pm), which is the geometric mean of the target high pressure (Pd) and a suction pressure (Ps). When a low pressure (LP) in an outdoor heat exchanger (11) is equal to or less than a first threshold value (P1) the control unit (10) performs control so as to reduce the rotational frequency of the low-stage compressor (7) and increase the rotational frequency of the high-stage compressor (9) in accordance with the reduction amount of the rotation frequency of the low-stage compressor.

Inventors:
MAENO MASASHI (JP)
WATANABE CHOYU (JP)
NAKAYAMA HIROSHI (JP)
Application Number:
JP2017/028135
Publication Date:
February 08, 2018
Filing Date:
August 02, 2017
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND THERMAL SYSTEMS LTD (JP)
CHUBU ELECTRIC POWER (JP)
International Classes:
F25B1/10; F25B1/00
Foreign References:
JP2016090143A2016-05-23
JP2012067954A2012-04-05
JPH0237258A1990-02-07
JP2004278824A2004-10-07
JP2013139902A2013-07-18
JP2002277082A2002-09-25
JP2001032772A2001-02-06
Other References:
See also references of EP 3453986A4
Attorney, Agent or Firm:
FUJITA, Takaharu (JP)
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