Calculate enclosure cooling, device junction temperature, and flat plate heat sink performance from heat load, temperatures, dimensions, and material data.
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Thermal Dissipation Formula
The following formula is used to calculate the effective thermal conductance:
Variables:
- G is the effective thermal conductance (watts/K, equivalently watts/ยฐC of difference)
- P is the power (watts)
- ฮT is the temperature difference (ยฐC)
To calculate effective thermal conductance, divide heat-transfer rate by a positive temperature difference. Heat-transfer rate itself is measured in watts; thermal resistance is the reciprocal conductance in K/W.
What is Thermal Dissipation?
Thermal dissipation is heat removal, measured as a heat-transfer rate in watts. Effective conductance describes heat transfer per degree of temperature difference. This calculator also estimates enclosure cooling balance, device temperature from an applicable thermal resistance, and flat-plate performance from a simplified steady-state convection and radiation model. Plate properties and exposed area must represent the real assembly; the model omits spreading and contact effects.
How to Calculate Thermal Dissipation?
The following steps outline how to calculate the Thermal Dissipation.
- First, determine the power (P) in watts.
- Next, determine the temperature difference (ฮT) in degrees Celsius.
- Use the Thermal conductance mode and G = P / ฮT to calculate effective conductance.
- Finally, express conductance in W/K (equivalently W/ยฐC of difference). The example below gives 150 / 25 = 6 W/K.
- After inserting the variables and calculating the result, check your answer with the calculator above.
Example Problem:
Use the following variables as an example problem to test your knowledge.
Power (P) = 150 watts
Temperature Difference (ฮT) = 25 ยฐC
