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How many BTU's does it take to evaporate one pound of water?


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Answered 2009-12-30 19:32:59
BTUs to Evaporate One Pound of WaterQuick Answer: Somewhere around 1000BTU/lb

Long answer: It depends on the temperature of the water you start with. Before you can evaporate the water, you must heat it to it's boiling point. The warmer the water you start with the fewer BTUs will be needed to heat the water to its boiling point. Keep in mind the BTUs require to raise the water to its boiling point are very few compared to the BTUs required to change the water from a liquid to a gas.

One pound of steam contains 1150 BTUs. This is the energy you need to put into the water for it to evaporate if you start with water at 32F. If you start with water at 100F the water already has 70 BTU/lb so the BTUs required to evaporate the water when you start at 100F is 1150-70 = 1080 BTU and so on.

You can get all this information in a steam table which can be found easily by searching the web.

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