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5-3. Insulating the Refrigerant Tubing
Tubing Insulation
● Standard Selection of Insulation Material
Under the environment of the high temperature and high
humidity, the surface of the insulation material is easy
to become condensation. This will result in leakage and
dew drop. See the chart shown below when selecting the
insulation material. In case that the ambient temperature and
relative humidity are placed above the line of the insulation
thickness, the condensation may occasionally make a dew
drop on the surface of the insulation material. In this case,
select the better insulation efficiency.
* However, since the condition will be different due to
the sort of the insulaton material and the environmental
condition of the installation place, see the chart shown
below as a reference when making a selection.
Standard Selection of Tubing Insulation
Sort of insulation material
Upper limits of usage
temperature
Calculating condition
Thermal conductivity
of insulation material
Refrigerant temperature
o6.35
100
90
80
70
60
50
40
10
20
Ambient temperature [°C]
o15.88
100
90
80
70
60
50
40
10
20
Ambient temperature [°C]
o25.4
100
90
80
70
60
50
40
10
20
Polyethylene heat resisting
material
Gas tubing : 120 °C or above
Other tubing : 80 °C or above
0.043 W/(m · K)
(Average temperature 23 °C)
2 °C
100
Thickness
90
30mm
80
Thickness
20mm
70
Thickness
60
10mm
50
40
30
40
50
10
100
90
Thickness
30mm
80
Thickness
20mm
70
60
Thickness
10mm
50
40
30
40
50
10
30
40
50
o9.52
Thickness
30mm
Thickness
20mm
Thickness
10mm
20
30
40
Ambient temperature [°C]
o19.05
Thickness
30mm
Thickness
20mm
Thickness
10mm
20
30
40
Ambient temperature [°C]
36
Two tubes arranged together
Gas tube
Liquid tube
Insulation
o12.7
100
90
80
70
60
50
40
50
10
20
Ambient temperature [°C]
o22.22
100
90
80
70
60
50
40
50
10
20
Ambient temperature [°C]
Thickness
30mm
Thickness
20mm
Thickness
10mm
30
40
50
Thickness
30mm
Thickness
20mm
Thickness
10mm
30
40
50
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