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there is 4.1858 joules in a calorie

1 kg of steam requires 538 kilocalories to be produced plus superheat for use in a steam engine of about another 400 Kc approximately. If the engine has a watering rate of 2.2 KG per Kw using the 938 Kc / Kg that would require 2.0636 Mc / Kw.

This is equivalent to 8.6378 MJ/Kw x 1000 Kw/Mw = 8.6378 GJ/Mw of heat energy in the steam.

With the efficiency of the best boilers of ~25% conversion of heat from combustion to steam output the amount of heat from Natural gas required would be about 34.551 GJ energy input. These numbers are only an estimate, actual boiler and engine/ generator efficiencies will differ as will steam conditions.

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Q: How many GJ of natural gas to power 1 MW power plant?
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