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Heat load calculation for the control cabinets

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makbhure

Electrical
Joined
Nov 28, 2002
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3
Location
GB
I have to give inputs to HVAC engineer regarding heat loads in the control room.The control room contains the PLc cabinets and Lighting.How shall i calculate the heat loads for a PLc cabinet.The cabinet is having AB make PLC,isolation transformer,power supply and terminals.CAn anybody help me in calculating this.Thanks in advance.
 
Suggestion: Usually, one considers the input watt power of the cabinet or its components and subtracts watt power supplied to loads from the cabinet. This watt power difference usually dissipates into heat.
 
the A/C mfrs have good calcs in their catalogs. i've used kooltronics and mcclean-midwest successfully. one or both has a free program you can download. these are meant to size an a/c unit for the cabinet, but i'm guessing the principles would be the same for multiple cabinets in a room. use the efficiencies given by the plc mfrs, lighting fixtures, etc. to calculate how much power goes into heating the cabinet(room) as jbartos says.
 
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