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  1. bagofmilk

    Derivation of HVAC equation

    Hi bagofmilk, I actually just experienced this at work. You had it right by following the 1st Law, but you must also neglect Kinetic Energy as the Velocities are essentially the same. With that you will be left with Work equal to mass flow times change in enthalpy. Then remember that mass floe...
  2. bagofmilk

    Derivation of HVAC equation

    Yes. Thank you dfaunce. Do you know where that equation came from, even that document doesn't really describe where it came from.
  3. bagofmilk

    Derivation of HVAC equation

    First of all, what is the name of this equation: ΔT = SPtotal / (2.7*ηf) This is used in HVAC applications to determine the total temperature rise across the supply fan. Where: ΔT = change in temperature (F) SP = Total Static Pressure (inH2O) ηf = fan efficiency (decimal form) And...

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