Symbols in accordance with ISO recommendations ISO

ISO Armacell European recommendations 1. Temperatures Q ambient Qa line Qi dew point Qdew x mean Qav outer surface of insulation Qse 2. Relative humidity F 3. Insulation thickness flat surface df x tube dp 4. Pipe diameter uninsulated Di with insulation De 5. Thermal conductivity l 6. Heat transfer Inner surface coefficient hi Outer surface coefficient he Convective contribution hcv Radiative contribution hr 7. Heat flow rate Density of heat flow rate q W/mē Linear density of heat flow rate q2 w/mē Above taken from CEN/TC89/WG3 recommendations and ISO 9346 : 1987

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