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Air-conditioning apparatus

a technology for air-conditioning equipment and equipment, which is applied in the direction of lighting and heating equipment, refrigeration components, heating types, etc., can solve the problems of high flammability and and achieve the effect of reducing the formation of flammable concentration regions

Inactive Publication Date: 2017-10-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention prevents the formation of a flammable concentration region in indoor spaces in case of accidental leaks of flammable refrigerant.

Problems solved by technology

However, unlike R-410A, which is non-flammable, refrigerants such as R-290 and R-1270 have high flammability (highly flammable).
Leakage of flammable refrigerant into the indoor space causes indoor refrigerant concentration to increase, potentially leading to formation of a flammable concentration region.
Further, when a refrigerant leak is detected, the indoor-unit air-sending fan is rotated.

Method used

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Examples

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embodiment 1

[0029]An air-conditioning apparatus according to Embodiment 1 of the present invention will be described. FIG. 1 is a refrigerant circuit diagram illustrating the general configuration of the air-conditioning apparatus according to Embodiment 1. In the drawings including FIG. 1, features such as the relative sizes of components and their shapes may not be to scale.

[0030]As illustrated in FIG. 1, the air-conditioning apparatus has a refrigeration cycle 40 through which refrigerant is circulated. The refrigeration cycle 40 includes a compressor 3, a refrigerant flow switching device 4, an outdoor heat exchanger 5 (heat source-side heat exchanger), a pressure reducing device 6, and an indoor heat exchanger 7 (load-side heat exchanger) that are annularly connected in the stated order by pipes. The air-conditioning apparatus further includes an indoor unit 1 that is installed indoors, for example, and an outdoor unit 2 that is installed outdoors, for example. The indoor unit 1 and the ou...

embodiment 2

[0088]An air-conditioning apparatus according to Embodiment 2 of the present invention will be described. In the air-conditioning apparatus according to Embodiment 2, the amount of refrigerant charge M, the lower flammable limit LFL of the refrigerant, the floor area A of the indoor space 120, and the height Ho of the air outlet 113 satisfy the relationship of M≧LFL×A×Ho.

[0089]FIG. 10 is a cross-sectional view illustrating the configuration in the vicinity area of the air outlet 113 of the indoor unit 1 of the air-conditioning apparatus according to Embodiment 2. The configuration of the indoor unit 1 in areas other than the vicinity of the air outlet 113 is the same as that of the indoor unit 1 according to Embodiment 1, thus illustration and description of the configuration in these areas will be omitted.

[0090]As illustrated in FIG. 10, the indoor unit 1 according to Embodiment 2 has, at the air outlet 113, a single or a plurality of (five in the present example) vertical air defl...

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PUM

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Abstract

An indoor unit includes an air-sending fan, an air inlet through which air of an indoor space is sucked in, and an air outlet located above the air inlet and through which the air sucked in through the air inlet is blown out to the indoor space. A control unit activates the air-sending fan when leakage of the refrigerant is detected. When M [kg] represents an amount of charge of the refrigerant in a refrigeration cycle, LFL [kg / m3] represents a lower flammable limit of the refrigerant, A [m2] represents a floor area of the indoor space, and Ho [m] represents a height of the air outlet above a floor surface of the indoor space, the amount of charge M, the lower flammable limit LFL, the floor area A, and the height Ho satisfy a relationship of M<LFL×A×Ho.

Description

TECHNICAL FIELD[0001]The present invention relates to an air-conditioning apparatus.BACKGROUND ART[0002]HFC refrigerants such as R-410A, which are non-flammable, are conventionally used for air-conditioning apparatuses. Unlike conventional HCFC refrigerants such as R-22, R-410A has a zero ozone depletion potential (to be referred to as “ODP” hereinafter), and hence does not deplete the ozone layer. However, R-410A has a high global warming potential (to be referred to as “GWP” hereinafter). Thus, as part of global warming prevention measures, studies are under way for a switch from HFC refrigerants with high GWPs, such as R-410A, to refrigerants with low GWPs.[0003]Candidates for such refrigerants with low GWPs include HC refrigerants such as R-290 (C3H8, propane) and R-1270 (C3H6, propylene), which are natural refrigerants. However, unlike R-410A, which is non-flammable, refrigerants such as R-290 and R-1270 have high flammability (highly flammable). Thus, when R-290 or R-1270 is t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F25B49/02F25B45/00F25B13/00
CPCF25B49/02F25B13/00F25B45/00F25B2313/0293F25B2400/121F25B2500/222F25B2400/12F25B49/005F24F11/30F24F2110/50F24F11/32F24F11/70F24F11/36F24F11/89Y02B30/70
Inventor SUZUKI, YASUHIROKOMAI, TAKAOMAEDA, AKIRAKAWASHIMA, MITSURU
Owner MITSUBISHI ELECTRIC CORP