Radiation

Analysis > Boundary Conditions > Radiation

Introduction

Radiation BC allows the user to include thermal radiation in the model. The radiation boundary condition allows to include radiation heat to ambient, and it depends on an ambient temperature, a surface emissivity, and a view factor.

Description

• This is the simplified radiation approach that provides a boundary condition for radiation (analogous to convection BC).
• The radiation heat is added or removed from the list of surfaces using fixed surroundings temperature, surface emissivity and view factor.
• This option is designed to be used to include radiation to ambient (from external surfaces) or an external object at a given temperature.
• Temperature can be either constant or variable if a multiplier table is defined when creating the boundary condition.

  

• There are three types of multiplier tables:

  1. Time - Multiplier value varies as a function of time.
  2. Iteration - Multiplier value varies as a function of the iteration.
  3. Sensor – Multiplier value varies based on the selected sensor output.
  4. Thermostat - Multiplier value varies based on the ON/OFF status of the selected thermostat.