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### Chemical and Process Engineering Resources

 Category: Heat Transfer Technology Question: How can one calculate how much steam will be required to heat water from one temperature to another? Keywords: heat,transfer,steam,water,heating Answer: Here is the equation that you want:X = (W)(Cp)(Delta T) / Hwhere:X = lb/hr of steamW = lb/hr of water flow = (500)(gpm of water flow)Cp = specific heat of water = 1 BTU / lb / ??FDelta T = how many degrees F that you want to heat the waterH = latent heat of vaporization of your steam, Btu / lbYou can look up the latent heat (i.e., H) of your steam in a set of Steam Tables. Alternatively, you can assume that H = 1000 Btu / lb and that will probably be close enough.For example, if you want to heat 100 gpm of water from 80 ??F to 125 ??F:X = (500)(100)(1)(125 - 80) / 1000 = 2250 lb/hr of steam Source: Cheresources Message Board, Mr. Milton Beychok