HEAT PUMP DEVICE - MITSUBISHI ELECTRIC CORP

Title:

HEAT PUMP DEVICE

Document Type and Number:

WIPO Patent Application WO/2011/010473

Kind Code:

A1

Abstract:

Disclosed is a heat pump device wherein the heat radiation loss as well as the compressor input are reduced during a defrosting operation, so that the efficiency of the defrosting operation is enhanced. The heat pump device is comprised of a main refrigerant circuit wherein a compressor (1), a first heat exchanger (3), an expansion mechanism (4), and a second heat exchanger (5) are connected in this order; and a bypass circuit (7) provided with an open/close valve (6), which bypasses the expansion mechanism (4). The main refrigerant circuit is provided with a four-way valve (2) which switches the circulation pathways of the refrigerant in the main refrigerant circuit, to change the operation between a heating operation and a defrosting operation. Further, the main refrigerant circuit is provided with a first temperature detection portion (10) and a second temperature detection portion (11), and the extent of overheating of the first heat exchanger (3) during a defrosting operation is calculated on the basis of the values detected by these detection portions. In the heat pump device, when the operation is switched from a heating operation to a defrosting operation, the open/close valve (6) is opened so that the circulation volume of the refrigerant circulating in the refrigerant circuit is increased, and the operation frequency of the compressor (1) is controlled so that the extent of overheating reaches a predetermined target value.

Inventors:

HAMADA MAMORU (JP)
UNEZAKI FUMITAKE (JP)
TAKAHASHI YOSHIHIRO (JP)
TAKAHASHI KENGO (JP)
OKADA KAZUKI (JP)
MINAMISAKO HIROKAZU (JP)
UCHINO SHINICHI (JP)

Application Number:

PCT/JP2010/050421

Publication Date:

January 27, 2011

Filing Date:

January 15, 2010

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP (JP)
HAMADA MAMORU (JP)
UNEZAKI FUMITAKE (JP)
TAKAHASHI YOSHIHIRO (JP)
TAKAHASHI KENGO (JP)
OKADA KAZUKI (JP)
MINAMISAKO HIROKAZU (JP)
UCHINO SHINICHI (JP)

International Classes:

F25B47/02; F24F11/02; F25B30/02

Foreign References:

JPS6470669A	1989-03-16
JP2007033002A	2007-02-08
JP2002327949A	2002-11-15
JPH05302771A	1993-11-16
JP2007515805A	2007-06-14
JP2004205194A	2004-07-22
JPH01127873A	1989-05-19
JP2008224088A	2008-09-25
JPS5923067U	1984-02-13
JPS6136659A	1986-02-21
JPS6146848A	1986-03-07

Other References: