Water, initially saturated vapor at 4 bar, fills a closed, rigid container, The water is heated until its temperature is 400C. For the water, determine the heat transfer in KJ per kg of water .
The Attempt at a Solution
Assume potential and kinetic energy=0, W=0,Steady state
I got the energy balance right: Q/m=(u2-u1)
Found v1 and u1 from steam tables:
specific volume: v1=v2=0.4625 m3/kg
u1 = 2553.6 KJ/kg
I know that state two is super heated, but how do I know what the pressure is?? What values do I interpolate with to get u2??