I've been looking at the examples on this page. The base formulas seem to be correct to me - what I don't understand is how they added efficiency to the formula.
Could it be that the heat recovery efficiency is a property of the heat exchanger and not the process. For example if the heat exchanger was a perfect insulator there would be no heat transfer (0% efficiency?). Nothing (almost) is perfect and a finite sized heat exchanger may not exchange 100% of the available heat with a given temperature differential. The process must recognize the limits (efficiency) of the equipment used.
Wow! i would be getting my canines quickly and the block off factor of the abode she'll be staying in does have a vent. suitable now we are canines proofing the gap so i will make helpful that blockading the vents or removing her collar is on the checklist! thank you lots. All those little ifs and buts look impossible until they ensue!
1] OK, maybe they should say 'coolth recovery', but that is just a question of sign... 2] You are not going to have a heat exchanger with infinite area, perfect conductivity, and zero film coefficient, so you will not transfer all the heat, so you need some measure of what fraction gets transferred. 3] You are right, BTU/Lb, not BTU/LbF
