## Tips and Tricks for Using EnergyPlus — EnergyPlus 8.8

### Tips and Tricks for Using EnergyPlus

Can EnergyPlus model reflective radiant barriers?

1. For radiant barriers which are exposed to a thermal zone, such as an attic space, specify a reduced thermal absorptance for the innermost material layer.

For example, an attic roof construction might be (outer to inner)

Asphalt shingles,
R-30 insulation,
Radiant barrier;

The radiant barrier material would be a thin layer with some small resistance with a low thermal absorptance value. This will reduce the radiant heat transfer from the roof surface to other surfaces in the attic zone.

1. If the radiant barrier is within a cavity which is not modeled as a separate thermal zone, then there is not an easy way to model its impact. For example, a wall construction:
Brick,
R-12 insulation,
Gypsum board;