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How do you convert steam usage in tonnes to Kwh of gas consumed?
Wiki User
∙ 13y ago
You have to consult tables which give the properties of water and steam (commonly called Steam Tables).
You have to calculate the total enthalpy of the steam as delivered, and subtract the enthalpy of the returned condensate (if returned) or of the water as it enters the boiler. In modern steam tables this will be in kilojoules per kilogram. You can multiply by mass to get total energy. To convert to kilowatt-hours, note that 1 kWh = 3.6 MJ.
Various organizations have published steam tables in the past. The one published by the International Association for the Properties of Water and Steam is the one to use, particularly the 1997 formulation for industrial application. There are some free caclulators online which claim compliance to the algorithms, but I can't vouch for any of them.
It is not straightforward and you may want the services of a competent steam engineer (that leaves me out. I may be able to hack my way through, but I am not "qualified" in this area.)
Wiki User
∙ 13y ago
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