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Old 19-07-2016, 03:48 AM   #8211
tanjhj
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The operating power will of course be higher for 12k btu fcus.

But you need to consider that a 12k fcu will cool the room faster than a 9k (assuming the compressor is sufficient). That also means the 12k will work at the rated power, for a shorter duration than a 9k will. The 12k will go into idle earlier than the 9k.

So overall how does the average electricity consumption plays out? I have no concrete answer. My personal gut feeling is the 12k will consume more electricity, but no more than 10% over its 9k counterpart.

25% is too much. Considering the bulk of the energy consumption comes from heat rejection, whose rate becomes (close to) 0 once the room has reached set temperature.

10% is a generous buffer I believe. I attribute it to the extra energy consumed by the slightly larger blower motor in the larger fancoil. That's about the only difference.

IC , however better be on safer side and put 25% which is as stated in papers specification.if not ppl may get scared by the bills.

Last edited by tanjhj; 20-07-2016 at 07:19 AM..
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