Heat loss depends on:
• the range of ambient conditions at the site location;
• the type of insulation;
• insulation thickness;
• cladding emissivity;
It can generally be assumed that the amount of energy lost is replaced by fuel used at ~80% efficiency. The installed cost ofinsulation should be used, not just material cost, for comparison with the energy cost.
On existing installations, it is good practice to carry out a thermal imaging survey in order to calculate the economic incentives for insulation and re- insulation, and also to prioritize the work.
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