Originally Posted by Paddy
Weasel is right on with the math, except that he understates the btu requirement by a considerable margin (for simplicity's sake) by only considering sensible heat transfer in his example.
12,800 btu/h output should account for total
BTU/H (Sensible + Latent heat transfer)
Correct me if I missed something.
Air Flow : 386 CFM measured via traverse of installed system.
Entering air conditions : 84.5 F. dry bulb temp., 65.5 F. wet bulb temp.
Leaving air conditions : 55.5 F. dry bulb temp., 54.8 F. wet bulb temp.
Total BTU/H = delta H x 4.5 x cfm
Enthalpy of entering air is 30.45
Enthalpy of leaving air is 23.07
30.45-23.07=7.38 delta H
7.38 x 4.5 x 386 = 12,819 Total BTU/H
I think ~18,000 (1.5 tons) would be about right for an RV-10 based on 1100+ hrs of flight time with this system.
My definition of "about right" would be, enough capacity that I can dress for Sunday morning worship with a full suit, hop in the RV-10 here in Mississippi, USA. middle of the summer (ambient conditions ~95 deg F. dry bulb / 70 deg F wet bulb) and not sweat anymore in the taxi/climb to altitude than I would in the Toyota driving to church.