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Once the water is at 100 Â°C, still more energy must be added. This is given by the heat of vaporization, which for water is 2261 kJoules per kilogram. So, in the example, once the 1 kg of water. is at 100 Â°C, this amount of energy must be added to boil it: 1 kg * 2261 KJoules/kilogram = 2261 kJoules.
More heat energy is required to raise its temperature to saturation point at 7 bar g than would be needed if the water were at atmospheric pressure. The table gives a value of 720.94 kJ to raise 1 kg of water from 0 oC to its saturation temperature of 170 oC.t atmospheric pressure (0 bar g, absolute 1 bar) , water boils at 100 oC, and 417.51 kJ of energy are required to heat 1 kg of water from 0 oC to its evaporating temperature of 100 oC. Therefore the specific enthalpy of water at 0 bar g (absolute 1 bar) and 100 oC is 417.51 kJ/kg, as shown in the table.