deoxidized water
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What is the difference in enthalpy between water at a pressure of 3.3 MPa and a temperature of 104°C, and water at a pressure of 0.1 MPa and the same temperature of 104°C?
There is basically no difference.
When performing the calculations, should the enthalpy value used as a reference be that of water or that of steam?
438/436 kJ/kg are both for liquid water
The enthalpy h of water or water vapor refers to the energy contained within 1 kilogram of water or 1 kilogram of water vapor at a certain pressure and temperature; in other words, it is the sum of the internal energy u of the water or water vapor and its pressure potential energy pv (h = u + pv). The enthalpy of water or water vapor can be considered equal to the heat absorbed when 1 kilogram of water at an absolute pressure of 0.1 MPa and a temperature of 0°C is heated to the pressure and temperature of that water or water vapor. The unit of enthalpy is “joules per kilogram”. Water with the same temperature but different pressures has different enthalpy values. During calculation, it is determined using the thermodynamic curves of water and water vapor.