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Technical System Catalogue Climate Control

Enclosure heaters Project planning Enclosure heaters Heating performance diagram The required thermal output is calculated from: 2 5 7.5 10 10 . 8 15 ΔT QH = A ΔT k 5 206 4 30 A 3 2 1.5 1 10 15 20 30 40 50 60 80 100 150 200 300 500 . QH . QH = Thermal output (W) A = Enclosure surface area to IEC 890 (m2) ΔT = Temperature difference (K) Based on: Interior siting, static air, heat transfer coefficient k = 5.5 W/m2 K For exterior siting (moving air): Double the determined thermal output Even temperature distribution Via a CFD analysis, even temperature distri- Temperature °C bution in the (empty) enclosure is observed when using a 400 W enclosure heater fol- 25.0000 lowing a heating period of approx. 22.5000 30 minutes. According to the CFD analysis, positioning 20.0000 of the enclosure heater in the base area of 17.5000 the enclosure is essential for even tempera- ture control of the enclosure, since those 15.0000 areas located beneath the heater are only minimally warmed. 12.5000 10.0000 7.50000 5.00000 Start After 5 minutes After 15 minutes After 30 minutes Technical System Catalogue/Climate control 3 - 82


Technical System Catalogue Climate Control
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