About the Portions of Cooling Load

Dry and Humid Cooling Load

The dry cooling load is the convection energy that must be provided to cool the building or a room to the desired air temperature.

If air is cooled, its humidity content is changed. The moist cooling load is the energy needed to return temperate room air to the desired humidity.

Cooling Load Components

In addition to the dry and moist cooling load, the cooling load is made up of the ventilation and radiant heating and cooling components.

The Ventilation portion consists of that part of the cooling load that is covered by a ventilation system. A ventilation system’s parameters can be set in the Cross-Room Load Assignment dialog in the Infiltration tab.

The Radiant Heating and Cooling portion consists of the portion of the cooling load that is covered by radiant cooling (or heating for the heating case). A radiant heating unit is in or on the enveloping surfaces of a room; it acts as a radiator and is therefore subject to a time delay. Through the delayed heat exchange from the walls with the air in the room, an increased cooling load can be generated when radiant cooling is used (in comparison with a purely convective cooling load).