Describe heat loss.
• Heat loss is the rate at which process equipment heat flows to a cooler ambient, stated in either watts or BTU/hour. The purpose of heat tracing is to replace that heat lost through the thermal insulation in order to maintain a desired temperature difference (ΔT or Delta T). Therefore, the first step in heat tracing system design is to calculate the heat loss. Heat loss calculations always involve three factors:
o (ΔT or Delta T) or (Tp –Ta)
o Nominal Pipe Size or Vessel Dimensions
o Types and Thickness of Thermal Insulation