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I was looking at some problems in Geankoplis' book on Transport Processes and Unit Ops and I came across this problem involving water at 85°C, atmospheric pressure. The problem required the enthalpy of the water and so the book used the enthalpy of saturated water at 85°C from a steam table. Clearly, the water is subcooled because the temperature is well below 100°C, thus the enthalpy should intuitively not be based on saturated conditions. Did the book use the enthalpy at saturated conditions as a close approximation of enthalpy at subcooled conditions, or is the enthalpy of subcooled water really just equals the enthalpy of saturated water at the same temperature? If the case is the former, what should be, strictly speaking, the correct way to determine the enthalpy of subcooled water?

Thanks a lot!

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# Enthalpy of Subcooled Water

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