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Water, initially a saturated vapor at 150 degrees Celsius, is contained in a piston-cylinder assembly. The water undergoes a polytrophic process (n=1) to a pressure of 0.01 MPa, during which the piston moves freely in the cylinder. If the change of state is brought about by heating the water as it undergoes an internally reversible process at constant temperature, determine the work and heat transfer per unit mass, each in kJ/kg.
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A well-insulated heat exchanger is used to heat water (cp = 4.18 KJ/kg*K) from 300 K to 90°C with a mass flow rate of 3 kg/s. Heat is supplied by hot oil (cp = 2.3 KJ/kg*K) that enters the heat exchanger at 200°C with a mass flow rate of 15 kg/s.
an insulated cylinder is initially divided into halves by a frictionless thermally conducting piston. on one side of
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the nozzle shown discharges a sheet of water through a 180 degree arc. the water speed is 15 ms and the jet thickness
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