Find the requested properties below a. The internal energy (u) of H_2O at P = 7.

Question

Find the requested properties below a. The internal energy (u) of H_2O at P = 7.0 bar & T = 320 degree C b. The specific volume (v) of R-134a at P = 5.0 bar, Saturated Liquid c. The enthalpy (h) of ammonia at P = 14 psi T = 40 degree F d. The internal energy (u) of H2O at P = 1 bar T = 50 degree C e. The enthalpy (h) of R-22 at T = 10 degree C and quality of x = 0.73 f. The internal energy (u) of Propane at T = 20 degree C and v = 0.032 m^3/kg g. The specific volume (v) of R-22 at P = 2.5 bar and T = 17.3 degree C h. The temperature (T) of H_2O at P = 14.7 psi and v = 32.8 ft^3/lb

Explanation / Answer

1. At the given conditions, saturation temperature of steam at 7 bar (700Kpa) =165 deg.c. since given temperature is 320 deg.c steam is under super heated conditions.

internal energy= 3295 KJ/kg

2. from R-134 A tables, specific volume = 0.082 m3/kg

3. T=40 deg.F= (40-32)/1.8 deg.c=4.4 deg.c and pressure = 14/14.7 atm =0.95 atm = 0.9625 bar, temperature corresponding to 96Kpa = -33.5 deg.c. Hence given conditions ammonia is super heated. specific enthalpy = 1500 Kj/kg

4. at 1 bar= 100Kpa, saturation temperature is 99.5 deg.c. hecne water is liquid at the given conditions. internal energy = 209 Kj/kg

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