Thermal loads dialog
To access this dialog, click 
(Simulation workspace > Setup tab > Loads panel > Internal Heat)
| Load Type | Units | Applied to... | Inputs required |
|---|---|---|---|
| Applied Temperature |
K, C, F, R | Faces, edges, and vertices. When selecting more than one input, all inputs must be of the same entity type. |
Specify the temperature in the desired units, such as Celsius. |
| Heat Source |
W, Btu/s, J/s | Faces, edges, and vertices. When selecting more than one input, all inputs must be of the same entity type. |
- Specify the amount of heat in the desired units, such as Watts. - Use the Unit Area checkbox to specify heat on a per unit area basis (instead of the total heat). The input units are changed accordingly. For example, the input window shows W/mm^2 instead of W (or similar unit changes) when you check this box.. |
| Convection |
J/(sm^2C), W/(m^2C), W/(m^2K), Btu/(hrft^2F), Btu/(sm^2C) | Faces | - The Coefficient Value is the film coefficient value from the convection heat transfer equation. Typical natural convection values for air would be in the 5-25 W/m^2 range. - Specify the temperature of the surrounding fluid (typically air) in the desired units. The heat convects to or from the specified entities. |
| Radiation |
K, C, F, R | Faces | - Emissivity/Absortivity Value is a coefficient in the radiation heat transfer equation. The coefficient can be specified from 0-1, lower values being more reflective and higher values being closer to a black body. - Specify the temperature of the surroundings. The heat radiates to or from the specified entities. |
| Internal Heat |
W, Btu/s, J/s | Body | - Can be specified as a constant heat load or as a heat load that is temperature-dependent. - Filling out temperature-dependent curves can be done automatically by selecting the curve type and entering the variables (such as slope for al line). - Use the Unit Volume checkbox to specify internal heat on a per unit volume basis (instead of the total heat). The input units are changed accordingly. For example, the input window shows W/mm^3 instead of W (or similar unit changes) when you check this box. - Specify the amount of heat in the current units. You can select alternative units to override the current default. - Enter a curve of internal heat versus temperature for temperature dependent loads. This type of load can be useful for heaters or other things for which the amount of heat being generated or removed depends on the temperature of the device. |