|12-26-19, 10:42 PM||#11|
Join Date: Dec 2019
Location: Northern Utah
Thanked 2 Times in 2 Posts
I took some measurements off my radiator well water geoheater in the greenhouse tonight. Its been running about 2 hours.
Single wall polycarbonate 14' x 14' greenhouse
outside air is 26F
inside air is 37F
Heater output is 45F
No sure of CFM
Input air temp measured 38F
Water inlet temperature is 55F
Water outlet temperature is 46F
Flow is 1.2 GPM
So to figure BTU's per hour
60min x 1.2 GPM = 72 gallons per hour
BTU's per Gallon @ deg per gallon extracted = 9 deg x 8.3 per gallon= 74.7
BTU's per Gallon 74.7 x GPH 72 = 5378 BTUs per hour
This is equal to about 1.57 Kwatts per hour of electrical heating. I'm using .2KWH with the blower and well pump running.
So my COP for just using a radiator and fan is 7.85 ???