Quote:
Originally Posted by masraum
30,000 gallons 85º to 95º takes 733.6 Kwh (equal to 2640954377J / 628798661cal / 733599Wh / 2503141 btu). IIRC, 10º∆ is the same whether it's + or -.
|
Except that the efficiency of a heating device is much greater than the efficiency of a cooling device.
Everything being equal, it takes more electricity to cool 10° than it does to heat 10°.
A heater is a heating element which is basically a resister with power applied. Water is circulated past the heated element. Requires a heating element and a water pump.
A cooler involves compressing a refrigerant to pressures above 100psi, running it through a cooler, then expanding it through a nozzle to get evaporation (and hence cooling). The pool water is circulated through a heat exchanger where the cold refrigerant cools the water and the refrigerant is compressed again… lots of moving parts, indirect energy conversion, requires a compressor, a fan, and a water pump.
Agreed that the energy required to heat water 10° is the same as to cool it 10° but practically, the energy inputs needed to cut a cooler to accomplish this are probably 2-3X more than a heater.