Computer gains

Activity tab in model data


Check the Computers > On checkbox to include computer gains in the simulation.


Set the thermal gains due to computers and other related IT equipment per unit floor area. The fuel is assumed to be electricity, all gains are assumed to be emitted to the space and

Radiant Fraction

This field is a decimal number between 0.0 and 1.0 and is used to characterise the amount of long-wave radiant heat being given off by computer equipment in a zone. The radiant fraction  will be multiplied by the total energy consumed by electric equipment and (1-Fraction lost) to give the amount of long wavelength radiation gain from computer equipment in a zone. A value of zero means that the heat gain is entirely convective in which case all the heat is transferred to the air node in simulations.  A value of 1 means that the gain is entirely radiative in which case all the heat is distributed to the inside surfaces. a typical value is somewhere between 0.1 and 0.2.


If the Internal gains operate with occupancy model option is not selected you can also set the operation schedule.


Tip: Some spaces like IT suites and dealing rooms have very high computer gain densities and you may need to Switch off the slider controls from the Program options dialog  to enter these high values.