AUX air conditioner service manual
235
4. Heat Conductivity Factors of Several Common Used Material
Material
λ（kJ/m·h·℃）
Material
λ（kJ/m·h·℃）
Copper 1382 Cork 0.17-0.25
Aluminum 733 Air Interlayer 0.25
Steel 163 Water 2.1
Frosty layer 2.1 Glass 2.7-2.9
Fibre Glass 0.17-0.21 Saw Timber 0.25-0.34
Glass Cloth 0.13 Plywood 0.62-0.84
Slag Wool 0.21-0.34 Polyurethane Foam 0.042-0.11
5. Basic Property of Substitute Refrigerant
Property R-22 R-410A R-407C
R-22 R32/R125
R32/R125/
R134a
Refrigerant Composition
（Mass Ratio ％）
100 50/50 23/25/52
ODP 0.05 0 0 Environme
nt
Protection
GWP（100Y）
1730 1700 1530
Toxicity None None None
Safety
Combustibility Incombustible Incombustible Incombustible
Azeotropic Prop --- Subazeotropic Subazeotropic
Boil Temp（℃）
-40.8 -52.7 -43.7
Thermo-ph
ysical
Properties
Critical Temp（℃）
96.1 72.5 87.3
Refrigeration
Pressure（Mpa）
2.17 3.38 2.31
Evaporation
Pressure（Mpa）
0.62 1.00 0.64
Pressure Ratio 3.50 3.38 3.59
Exhaust Temp（℃）
97.2 95.1 86.7
Refrigerati
on
Properties
Slip Temp（℃）
0
0.17 以下 4～6
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