When defining rooms, roofs, walls, and doors in your project, you can set a Glass Zone Type, ASHRAE Roof Type, or ASHRAE Wall Type. These types are based upon the 1997 ASHRAE Fundamentals Handbook.

The charts below illustrate how thermal lag and heat transfer differ among the available types.

Glass Zone Types

The Glass Zone Type is set in the room definition and affects the thermal lag of the solar load.

Lower zone types have higher peak values that quickly fall off. Higher zone types have lower peak values that fall off more slowly.

Roof Types

The ASHRAE Roof Type is set in the roof definition and affects solar heat transfer through the roof.

Generally, lower roof types have lighter construction and transfer heat more quickly. Higher roof types have heavier construction and transfer heat more slowly.

Wall Types

The ASHRAE Wall Type is set in the wall definition and door definition affects solar heat transfer through walls and doors.

Generally, lower wall types have lighter construction and transfer heat more quickly. Higher wall types have heavier construction and transfer heat more slowly.