CALCULATING HEAT LOSSES FOR PIPES
Calculating heat losses for pipes: To do a calculation of heat losses on an insulated pipe you have to know certain data: required operating temperature, pipe dimension, the thickness of the insulation and conductivity, the nature of the environment.
Q = |
2 x π x Dt x k x 1,16 x S |
In (dy / di) |
Q |
= |
Heat loss per meter pipe (W/m) |
Dt |
= |
Temperature difference (the difference between the operating temperature and the lowest ambient temperature). |
k |
= |
The heat permeability of the insulation (W/m°C). (Mineral wool = 0,04) |
1,16 |
= |
Konstant (conversion from kilojoules to watts) |
dy |
= |
The exterior diameter of the insulation (mm) |
di |
= |
The exterior diameter of the pipe (mm) |
S |
= |
Safety factor 1,2 -1.5 (1,2 indoor – 1,5 outdoor) |