Pressure Enthalpy Chart Water. The enthalpy of the water heat content in btu lb. As you can see at a pressure of 15 psig 29 7 psia water begins to boil at 253 f.
The enthalpy of the water heat content in btu lb. Pressure enthalpy diagram for water ohio university. This demonstration shows a pressure enthalpy diagram for water.
The figures and tables below shows how water enthalpy and entropy changes with temperature c and f at water saturation pressure which for practicle use gives the same result as atmospheric pressure at temperatures 100 c 212 f.
By definition water at atmospheric pres sure at a temperature lower than 212ºf is subcooled. Inside the curve of the pressure enthalpy chart each pressure correspond to single temperature what we call the boiling point at that specific pressure. Saturated water tables pressure press temp specific volume enthalpy internal energy entropy psia f ν f ν g h f h fg h g u f u g s f s g 1 101 70 016136 333 6 69 74 1036 0 1105 8 69 74 1044 0 13266 1 9779 5 162 21 016407 73 53 130 17 1000 9 1131 0 130 15 1063 0 23486 1 8441. The boiling point of water at atmospheric pressure 14 7 psi is 212 f if we increase the pressure the point will also increase that relationship between the saturated temperature and saturated pressure construct the 3rd most important chart in the industry p t chart or the pressure temperature chart.
