HeatSim calculates savings from insulating hot surfaces and open tanks, and from modifying combustion and boiler operation.

Hot surfaces include steam pipes, condensate pipes, extruder barrels, cylindrical and rectangular objects and open tanks. HeatSim algorithms calculate heat loss from hot surfaces via convection, radiation and evaporation (when applicable). Natural convection coefficients are calculated using ASHRAE and fundamental relations that consider the orientation and the temperature difference between the hot surface and surrounding air.

Calculation of the heat loss from uninsulated surfaces is straightforward since the surface temperature of the uninsulated object is typically known. However, to calculate the heat loss from the surface after insulation has been applied, the temperature of the insulated surface must be estimated. HeatSim uses an interative energy-balance approach for estimating the temperature of the insulated surface. To begin, the interative approach first estimates the surface temperature of the insulation to calculate the natural convection coefficient. It then solves an energy balance on the surface of the insulated surface to calculate a new surface temperature. This process is repeated until the energy balance converges at the surface temperature of the insulation. Heat loss from the insulated surface is then calculated. Energy savings are calculated as the difference between the heat loss from the uninsulated and insulated surfaces.

HeatSim also calculates combustion efficiency based on fuel type, stack temperature and stack excess air. HeatSim also includes detailed models of combustion and heat transfer effects to calculate savings from changing boiler operations.

Download Free Copy of HeatSim (No user support or warranty provided)