indeed, sensible heat is what is being measured
my problems were caused by temp compression by excessive thermal capitance in the loop, specifically at the crosses
- replaced all with some (fabricated) plastic bits, and all is well again
(undocumented was the fact that I'd used plastic crosses when doing these tests, which I still have; bleh 5 days wasted in hunting the problem)
yes Les, "C" is now taken inlet to inlet (by me anyway)
BUT I have found that a single temp at the fan inlet is rather inadaquate, the error can easily exceed ±0.5°C
- of course this depends on the desired precision
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