Heat Load Calc.
Heat Load Calc.
(OP)
I am working on the design of an HVAC system for a plant located in Africa. Total Heat Dissipation is based on Instrumentation(62kW) and lighting(11kW) totalling approx. 92kW. The Vendor is saying that this number is too high too cool. But the fact is is that these values are as such so the unit has to be sized appropriately o remove the 92kW. ie. 92 kW Cooling. Please tell me if my logic is correct.
Thanks, Dave
Thanks, Dave





RE: Heat Load Calc.
With regard to the lighting, I agree with you that the "...values are as such...". This is because the lights are (probably) all on at the same time.
With regard to the "instrumentation", I have some reservations. If 62 kW is the total nameplate rating, then it is extremely unlikely that this is the load the air conditioning will see. You will need to allow an element of diversity, but I don't know how much in your particular circumstances. I can say, however, that the realistic allowance for computer-type equipment is more like half the name plate rating.
Hope this helps.
Brian
RE: Heat Load Calc.
RE: Heat Load Calc.
Thanks for your help (Am I griping
RE: Heat Load Calc.
RE: Heat Load Calc.
Adding the heat gain from external heat to the equipment load is correct. But as far as electric load is concerned, 50 to 60% of tag kW rating is considered even incase of power panels.
Secondly, why do you want to throw away the air? Is recirculating the air against local codes? Maintain minimum fresh air required (16 cfm/perso) if possible and recirculate the air through filtration.
HeatTreater!
Can you please tell me why the evaporator heat capacity should be more than that of condenser? Generally evaporator has to remove the heat necessary to maintain a certain temperature in a controlled environment. (which is called Refrigeration Effect). But on the other hand, condenser has to take care of Refrigeration Effect + Heat equivalent to the work done by the compressor.