CALCULATION OF TEMPERATURE CONTROL IN ENCLOSURES
What’s needed:
- The dimensions of the enclosure (height, width, depth) [m]
- The enclosure position (eg. single enclosure in row) according to calculation formula, enclosure surface area A [m²]
- The enclosure material (metal, plastic) heat transfer coefficient from table, k [W/m² K]
- The temperature difference between desired enclosure interior temperature Ti [°C] and the expected ambient temperature Tu [°C] (eg. day – night, summer – winter, climate zones) ΔT [K=Kelvin]
- The stray power (self-warming) of all installed components during operation (eg. transformers, relays, semi-conductors) Pv [W]
Calculation and selection of parameters: enclosure surface area – heat transfer coefficient – temperature difference
Single enclosure free on all sides | A = 1.8 x H x (W + D) + 1.4 x W x D | |
Single enclosure, wall mounted | A = 1.4 x W x (H + D) + 1.8 x H x D | |
First or last enclosure in free standing row | A = 1.4 x D x (W + H) + 1.8 x W x H | |
First or last enclosure in wall mounted row | A = 1.4 x H x (W + D) + 1.4 x W x D | |
Middle enclosure in free standing row | A = 1.8 x W x H + 1.4 x W x D +D x H | |
Middle enclosure in wall mounted row | A = 1.4 x W x (W + D) + D x H | |
Middle enclosure in wall mounted row with covered top | A = 1.4 x W x H + 0.7 x W x D + D x H topp |
To calculate the effective temperature we use the formula:
Teff = 33 | (10x√v-v+10.45)(33-T) |
22.066 |