Data: Water at 20 psia and 320 °F Determine a) Saturation temperature at this pr

Question

Data: Water at 20 psia and 320 °F Determine a) Saturation temperature at this pressure: T Tsat20 pia Since 320 > Tsat @ 20 psia, the water is in the superheated vapor region. Determine: b) Specific internal energy: Take-Home Exercise Complete the following table for water. Show calculations on additional page as necessary. T (oC) v (kJ/kg)u (kJ/kg) (kJ/kg) Phase 200 kPa 0.7 140 1718.74 950 kPa 0.0 80 500 kPa 70 kPa 3.00 1 bar 3 bar 12.5 bar 400 3020.0 280 1 - phase will be liquid, vapor, mixture, saturated liquid, or saturated vapor

Explanation / Answer

1)

a) at 20psia Tsat = 227.92oF

b) from superheated tables at P = 20 psia and T = 320oF specific internal energy u = 1116.1 Btu/lbm

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