How's your head today?
If you're ever gonna get out of the truck, you'll have to learn how to deal with this shiite. ;)
I would like your imput on the following. I'm trying to figure out efficiency of this heat pump. Here's my calculations.
Indoor 72 F. Outdoor 40 F
To get CFM of air handler:
Temp in = 72 Temp out = 91 TR = 19 BTUH = 237 VAC x 20 A x 3.412 = 16,173
CFM = BTUH / (TR * 1.08) CFM = 16,173 / (19 * 1.08) CFM = 16,173 / 20.52 = 788
To get BTUH output of heat pump (w/o heat strip):
Temp in = 73 Temp out = 93 TR = 25 BTUH = CFM x TR x 1.08 BTUH = 788 x 25 x 1.08 = 21,276
To get BTUH of energy input:
237VAC Heat pump fan = 0.59A Heat pump compressor = 7.6A Total heat pump W = 8.19 x 237 = 1,941BTUH = W x 3.412 x 1.08 BTUH = 1941 x 3.412 x 1.08 = 7,153
COP = hh / hw where COP = Coefficient of Performance hh = heat produced (Btu/h) hw = equivalent electric energy input (Btu/h) = 3.412 Pw where Pw = electrical input energy (W)
COP = 21,276 / 7,153 = 2.97
EER = hc / Pw where EER = Energy Efficiency Rating hc = cooling heat (Btu/h) Pw = electrical power (W)
hc = 21,276 Pw = air handler fan + heat pump fan + heat pump compressor Pw = (1.36 + 0.59 + 7.6) X 237 = 2263.35 EER = hc / Pw EER = 21,276 / 2,263 = 9.4
Formulas from:
These are for a 2 Ton, R410A, 13 SEER @ 40 F outside Data sheet shows: MBh 19.8 COP 3.06 EER 10.5 Amps 7.0 Hi PR 212 Lo PR 54