Heat pump apparatus and method of controlling heat pump apparatus

a heat pump and heat pump technology, applied in the direction of lighting and heating apparatus, heating types, refrigeration components, etc., can solve the problem of all these refrigerants being flammabl
US20140196483A1Inactive Publication Date: 2014-07-17MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
MITSUBISHI ELECTRIC CORP
Publication Date
2014-07-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

In a heat pump apparatus of an indirect type including a primary circuit on a heat source side and a secondary circuit on a load side, a refrigerant in the primary circuit is prevented from leaking through the secondary circuit.An air-conditioning apparatus includes a leakage detecting device that detects leakage of the refrigerant circulated through a refrigerant circuit, serving as the primary circuit, from an intermediate heat exchanger into a water circuit, serving as the secondary circuit, and a controller that closes valves arranged on both sides of the intermediate heat exchanger in the water circuit to prevent water containing the refrigerant from flowing beyond the valves when the leakage detecting device detects the leakage.
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Description

TECHNICAL FIELD

[0001] The present invention relates to a technique for securing safety when a refrigerant leaks from a heat pump apparatus.BACKGROUND ART

[0002] An air-conditioning apparatus (an example of a heat pump apparatus) has been known which utilizes a refrigeration cycle technique using a refrigerant as a way of cooling, heating, or dehumidifying a room.

[0003] Fluorine compounds, such as R410A that is hydrofluorocarbon (HFC), are widely used as refrigerants in air-conditioning apparatuses. These refrigerants, however, have a considerable impact on global warming. In terms of prevention of global warming, therefore, it is desirable to use refrigerants having a less impact on global warming. Accordingly, the use of refrigerants having a less impact on global warming, such as R32 that is HFC, R1234yf that is hydrofluoro-olefin (HFO), propane and isobutene that are hydrocarbons, has been proposed. Disadvantageously, all of these refrigerants are flammable, unlike the conventional r...

Claims

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