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Technical System Catalogue Climate Control

TopTherm fan-and-filter units Calculation basis for enclosure climate control In natural convection, heat loss is dissipated to the outside . via the enclosure panels. The prerequisite for this is that the Qv = Heat loss installed in the enclosure W ambient temperature must be lower than the temperature . inside the enclosure. The maximum temperature increase s = Heat emitted by the enclosure surface W.Q (ΔT)max. which may occur inside an enclosure compared with Qs < 0: Irradiation (Ti uu))> Ti.Qs > 0: Radiation (T the ambient air is calculated as follows: . QK = Required cooling output of an enclosure cooling unit W . QH = Required thermal output of an enclosure heater W. (ΔT)max. = Qv qw = Specific thermal output of a heat exchanger W/K. Aof a fan-and-filter unit to main-= Required volumetric air flowVk tain the maximum permissible temperature difference between the supply air and the exhaust air m3/h ΔT = Ti – Tu = Max. permissible temperature difference K Note: A = Effective, heat loss-dissipating enclosure surface area to If the heat loss inside the enclosure is not known, this basic IEC 890 m2 formula can be used to calculate actual heat loss, by meas- temperature Ti: for sheet steel k = 5.5 W/m2Ku and the enclosure internal 2K= Heat transfer coefficient W/mkuring the ambient temperature T . QS = A k ΔT (watts) 3 - 5 Technical System Catalogue/Climate control


Technical System Catalogue Climate Control
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