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Ammonia enters a valve as saturated liquid at 9 bar and undergoes a throttling process to a pressure of 2 bar. Determine the rate of entropy production per unit mass of ammonia flowing, in kW/(kg·K). If the valve were replaced by a power-recovery turbine operating at steady state, determine the maximum theoretical power that could be developed per unit mass of ammonia flowing, in kJ/kg, and comment. In each case, ignore heat transfer with the surroundings and changes in kinetic and potential energy.
the need arises in a laboratory for 2000cm3 of an antifreeze consisting of a 30 mole-percent solution methanol in
a carnot heat pump is to be used to heat a house and maintain it at 25c in the winter. on a day when the average
A group of 20 students attend class in a room which measures 7m x 7m and has a 3 m ceiling height. Assume that each student occupies 0.07 m3 and gives out 400 kJ of heat per hour. Calculate the air temperature rise occurring within 15 min of the star..
the last segment of the triple jump tracxk and feild event is the jump in which the athlete makes a final leap landing
The power output of an ideal, open-cycle gas turbine cycle is 75 MW and its pressure ratio is 16. Air enters the compressor at 520 R and enters the turbine at 2800 R. Using variable specific heats at 1000°F: cp = 0.263 Btu/lbm-R and k = cp/cv = 1.353..
Air flows isentropically through a convergent-divergent passage with inlet area 5.2 cm^2, minimum area 3.2cm^2 and exit area 3.87 cm^2. At the inlet the air velocity is 100m/s, is 680 kPa, and temperature 345 K.
a cylindrical bar of steel e 209 gpa or 30 times106 psi v 0.30 9.6 mm 0.3780 in. in diameter is to be deformed
electrical conductivity of stainless steel at room temperature is 0.2 x 107 ?-1 m-1. a 10 foot long piece of stainless
a heat pump heats a house in the winter and then reverses to cool it in the summer. the interior temperature should be
a mountain climber carries a barometer which reads 30.1 in hg at the base of the mountain. after her climb the
a sphere of solid density rho s and diameter d is dropped to a water pond density rho s and viscosity mu. initial
A fixed mass of air is at a temperature of 100 degrees Celsius and a pressure of 500 kPa. Determine the specific volume.
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