t 10 bar and 179.9 C, these are the properties of liquid water (vapor water): mo
ID: 630758 • Letter: T
Question
t 10 bar and 179.9 C, these are the properties of liquid water (vapor water): molar volume of 0.001127 (0.1943) m^3/kg, internal energy of 761.5 (2581.9) kJ/kg, and enthalpy of 762.6 (2776.2) kJ/kg. At 5 bar and 151.8 C, these are the properties of liquid water (vapor water): molar volume of 0.001093 (0.375) m^3/kg, internal energy of 639.6 (2560.2) kJ/kg, and enthalpy of 640.1 (2747.5) kJ/kg. What is the change in average specific (kJ/kg) enthalpy of this system if the quality increases by 0.71 at a constant pressure of 10 bar?Explanation / Answer
Enthalpy of liquid water at 10 bar = 761.5 KJ/kg
Enthalpy of vapour at 10 bar = 2581.9 KJ/kg
if quality increases by 0.71 then change in enthalpy
= 0.71 (2581.9 - 761.5 ) =1292.5 KJ/kg
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