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Btu calculation

  1. Aug 31, 2010 #1
    I am trying to develop a btu calculator for my solar thermal water heater. I would eventually like to use labview to do the acquisition. I have an internal heat exchanger and know the temperature before and after it enters the exchanger. I have a flow meter w/ a pulse output. What would the equation look like to do the calculation? Can I use the volume of the exchanger (approx 2 gallons) multiplied by the gallon to pound conversion, then multiplied by the flow rate over the period of the exchange?


  2. jcsd
  3. Aug 31, 2010 #2


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    Staff: Mentor

    Welcome to PF.

    It's flow rate in lb/hr times the temperature difference between the in and out of the heat exchanger.
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