RE: Change In Enthalpy


I read in an article that 6.66 change in enthalpy is about 400 cfm. What causes a really high and really low enthalpy reading?

csp02 Rookie Asked on April 13, 2018 in Residential HVAC.
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3 Answers

Your question isn’t very clear.  There’s lots of things that affect enthalpy change,  R/A conditions, charge on the unit, outdoor temp. etc.  To calculate BTU/hr from enthalpy change one can use the following formula.

BTU/h = 4.5 * DeltaE * CFM

MeasureQuick does have some voodoo magic formula that estimates CFM from enthalpy change measurements, but I’m not exactly sure the formulas they are using to do it.

Junior Tech Answered on April 14, 2018.
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