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Air conditioner and setting method thereof

An air-conditioning device and air technology, which is applied in the direction of air-conditioning systems, heating methods, lighting and heating equipment, etc., can solve the problem of long refrigerant piping and achieve the effect of not destroying safety

Active Publication Date: 2021-05-11
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, in the technology using (Formula I) described in Patent Document 1, there is no term related to the leakage rate of refrigerant in (Formula I), so there is a possibility of excessively restricting (discharging, etc.) the amount of refrigerant. The refrigerant piping to the indoor unit is long, and in commercial air conditioners that are installed in high heat load objects such as kitchens compared with household use, it is difficult to perform the required performance even if the technology of reducing the enclosed refrigerant is used. capability and satisfy (Formula I)

Method used

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  • Air conditioner and setting method thereof
  • Air conditioner and setting method thereof
  • Air conditioner and setting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] figure 1 It is a schematic diagram showing an example of an indoor unit constituting the air conditioner (hereinafter referred to as the air conditioner 100 ) according to Embodiment 1 of the present invention. figure 2 It is a schematic diagram showing another example of the indoor unit constituting the air conditioner 100 . image 3 It is a schematic diagram showing still another example of the indoor unit constituting the air conditioner 100 . Figure 4 It is a schematic diagram showing still another example of the indoor unit constituting the air conditioner 100 . Figure 5 It is a schematic configuration diagram showing the refrigerant circuit configuration of the air conditioner 100 . based on Figure 1 to Figure 5 , the air conditioner 100 will be described centering on the indoor unit.

[0029] The air conditioner 100 is assumed to use a flammable refrigerant, with Figure 1 ~ Figure 4 The illustrated indoor unit 1 and an outdoor unit 10 connected to the i...

Embodiment 1

[0064] Tables 1 to 9 are for installing the wall-mounted indoor unit 1 so that the ground height of the lower end is 1.8m, and the floor space is 12m. 2 、36m 2 、64m 2, a wall surface of a confined space 50 with a ceiling height of 2.5m, and the leakage refrigerant amount is 0.5-70.0kg, the average leakage velocity V is 5kg / h, 10kg / h, 75kg / h, and the ground height of the gas concentration sensor is In the case of 50mm, 100mm, 250mm, 500mm, 1000mm, 1500mm, and 2000mm, the investigation of the occurrence of combustible area when R32 leaks.

[0065] [Table 1]

[0066]

[0067] [Table 2]

[0068]

[0069] [table 3]

[0070]

[0071] [Table 4]

[0072]

[0073] [table 5]

[0074]

[0075] [Table 6]

[0076]

[0077] [Table 7]

[0078]

[0079] [Table 8]

[0080]

[0081] [Table 9]

[0082]

[0083] To organize the above examples, the allowable refrigerant amount (M upper limit) and the m based on IEC60335-2-40 do not appear in the flammable area ...

Embodiment 2

[0104] The ceiling-type indoor unit 1 is installed in such a way that the ground height of the lower end is 2.2m, and the floor space is 12m. 2 、36m 2 、64m 2 The central part of the ceiling of the closed space 50, and the leakage refrigerant amount is 0.5 ~ 53.4kg, the average leakage velocity V is 5kg / h, 10kg / h, 75kg / h, and the height of the gas concentration sensor above the ground is 50mm, 100mm, 250mm , 500mm, 1000mm, 1500mm, and 2000mm, the results of the same investigation on the occurrence of combustible regions in the case of leaking R32 are shown in Table 11.

[0105] [Table 11]

[0106] h 0 = 2.2[m] M upper limit or m max (in brackets is m max / A or Mcap / A)

[0107]

[0108] Thus, the same phenomenon as in Example 1 occurs, at h 0 =2.2[m], when G=5[kg / h], (the maximum value of M / A)=1.30[kg / m 2 ], G=10[kg / h], (the maximum value of M / A)=0.925[kg / m 2 ], G=75[kg / h], (the maximum value of M / A)=0.423[kg / m 2 ] can be.

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Abstract

The invention provides an air conditioner and a setting method thereof. The indoor unit (1) of the air conditioner (100) is installed at the installation height h in the space of the installation floor area A 0 As above, the amount of refrigerant M [kg] to be charged is set as (formula) M≤α×G ‑β × h 0 within the range of ×A.

Description

technical field [0001] The present invention relates to an air conditioner using a flammable refrigerant and an installation method thereof. Background technique [0002] Conventionally, there is an air conditioner that executes a refrigeration cycle using an "HFC refrigerant" such as nonflammable R410A. This R410A is different from the existing "HCFC refrigerants" such as R22. It has zero ozone layer depletion potential (hereinafter referred to as "ODP") and does not destroy the ozone layer, but has global warming potential (hereinafter referred to as "GWP"). ”) high in nature. Therefore, as part of the prevention of global warming, studies are under way to switch from high-GWP HFC refrigerants such as R410A to low-GWP refrigerants (hereinafter referred to as "low-GWP refrigerants"). [0003] As a candidate for a low-GWP refrigerant, there is R290 (C 3 h 8 ; propane), R1270 (C 3 h 6 ; Propylene) as HC refrigerant. However, since such HC refrigerants have a high-flamm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24F13/32F25B1/00F25B45/00F25B49/02F24F1/0059
CPCF24F13/32F25B49/02F25B2400/12F25B2500/19F24F1/005F24F1/0047F24F1/0057F24F1/0059F25B45/00F25B2345/001
Inventor 前田晃驹井隆雄铃木康巨
Owner MITSUBISHI ELECTRIC CORP
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