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How do you calculate BTU of expanding compressed air

  1. Jul 7, 2012 #1
    I would like to know if there is a measure, in BTU's, of the cooling effect from the release of compressed air through a nozzle and how it relates to PSI
  2. jcsd
  3. Jul 8, 2012 #2
    BTU is the unit of energy and PSI is the unit of pressure. 1 PSI = 6894.757 N/m2

    I BTU = 1055 Nm

    Now multiply the unit PSI by m3 i.e volume SI unit you get 1 PSI m3 = 6894.757 Nm

    1 BTU = 1055 Nm

    So 6894.757 Nm = 6.535 BTU
    So 1 PSI m3 = 6.535 BTU
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