Comparison between convection cooling, air cooling and liquid cooling
The following example calculation shows that through the liquid cooling, more power can be derived with the same cooling surface than with air cooling or convection cooling. The efficiency is improved through liquid cooling.
Example:
Given:
- Motor with smooth casing
- Area of the motor: A = 0.01 m²
- Housing temperature increase: ΔT = 40 K
- Efficiency of the motor: ƞ = 0,85
- Coolant: water
Searched for:
- Deriving power with the different cooling methods.
Calculation:
| Convection cooling | Air cooling | Liquid cooling |
|---|---|---|
|
Heat transfer number (Benchmarks): |
||
|
Deriving power: |
||
| Output power of the motor: | ||
Legend
| Area | |
| Kelvin | |
|
Active power motor |
|
|
Power loss |
|
| Watt | |
| Heat transfer number | |
| Efficiency | |
| Permissible temperature increase of the coolant |
