Heat Loss
Heat loss is the unwanted transfer of thermal energy from hot equipment — pipes, valves, vessels, boilers — to the surrounding air through conduction, convection and radiation. Every watt lost is fuel burned for no process benefit, so reducing it directly cuts energy cost and emissions.
On industrial hot surfaces, heat loss happens continuously wherever a hot surface meets cooler air. Bare or poorly insulated valves, flanges, manways and pipe sections can each lose hundreds of watts. The loss scales with surface area, surface temperature and emissivity. Reducing it is the cheapest decarbonisation lever available because the saved fuel pays back the insulation quickly — often in under two years.
Related terms
Thermal Insulation · Surface Temperature · Thermal Conductivity (λ) · U-value (Thermal Transmittance) · Emissivity (ε)
Related guides
Where this applies
Retrofitting removable insulation to hot equipment · Conducting a hot-surface temperature survey · Maintaining surface condenser vacuum performance · Optimising cooling water treatment · Reducing and cascading steam pressure · Running an insulation jacket inspection programme · Tuning evaporative cooling performance