Wet steam properties.

We have a closed rigid vessel containing 1kg of water at its critical point, which is cooled until the internal pressure reaches 5 bar. What is the dryness fraction and change in internal energy?

Suraj Joshi - clarification required - wet steam properties

Suraj, Firstly, thanks for your initial answer, and apologies for not rating it. I didn't realise I needed to rate it upon receipt, rather than when convenient. If you could just clarify a couple of points relating to your answer though, we'll have another go at the rating bit. (1) "At critical point of water, T= 647.1K, P = 22.064 MPa, v = 2.84 cc3/g" T & P are fine, but where/how did you derive the value of V? If from steam tables, would it be possible to include a scan/link to the table in question? (2) Dryness Fraction. In the answer you provided, "v" was seemingly taken from values relating to water at Tc, whereas the other values (Vf & Vg) were taken from the v... click for more

Entropy

A well-insulated, shel-and-tube heat exchanger is used to heat water (Cp = 4.18kJ/kg *degC) in the tubes from 20degC to 70degC at a rate of 4.5kg/s. Heat is supplied by hot oil (Cp = 2.30kJ/kg *degC) that enters the shell side at 170degC at arate of 10kg/s. Disregarding any heat loss from the heat exchanger, determin (a) the exit temperature of the oil.

PSYCHROMETRY !!!

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Thermodynamics problem

Air flows through the converging-diverging nozzle. The conditions at the inlet side are at standard atmospheric conditions while the density and the temperature at station B is 0.060 lbm/ft3 and 30.5 degree Fahrenheit, while the density at station C is 0.050 lbm/ft3. the velocity at station A is recorded to be at 380 ft/s. Determine the following, assuming ideal gas conditions and isentropic process: a) Mass Flow of air b) The velocity of stations B and C c) The pressure at station B and C d) The changes in internal energy, enthalpy, kinetic energy and potential energies. Draw a diagram of the converging-diverging nozzle, where the diameter at station A=5 in, B=2 in, and the diame... click for more