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# Power Source

Power sources or heat sources can be used to simulate heat generation from a volume. Application examples include electronic equipment and HVAC systems, e.g., to model heat generated by chips on a circuit board.

## Preparation

SimScale currently supports power sources within four analysis types:

In all cases, the power source has to be assigned to a volume which can be one of the following:

• A CAD part (this only applies to conjugate analysis as convective analysis contains only the fluid volume)
• A geometry primitive (cartesian box, sphere, cylinder).
• A cell zone of any arbitrary shape.

Both watts $$(W)$$ and British thermal units $$(Btu/s)$$ are allowed to define power.

## Approach

In the simulation tree, navigate to Advanced Concepts and add a Power source by clicking on the ‘+’ button (circled). Absolute and Specific power sources are supported.

Did you know?

Power sources are supported in parametric studies within SimScale. To define the power sources of interest and run a parametric experiment, you can click on this button: Figure 2: A parametric experiment allows you to run multiple simulations in parallel with different power source values

### Absolute Power Source

This type of source has to be used when the total power emitted by the heating element is known. The user is required to provide this value and choose the relevant volume region in the domain.

### Specific Power Source

This type of source has to be used when the power density is known. This is simply total power per unit volume in $$m^3$$ or $$in^3$$. This quantity is often provided for batteries and fuel cells, for example.

Important

If a power source is applied to multiple entities, each of them will generate the prescribed power value. For example, if a heat source with a value of 100 $$W$$ is assigned to two entities, each will emit 100 $$W$$. Figure 3: Applying 1.5 $$W$$ heat loads to each of the 6 chips means the total power defined is 9 $$W$$.

Note

If you assign a negative value to a power source, it will extract heat from the system acting as a heat sink.

Last updated: June 15th, 2023