Chapter 8, Problem 8.26P

B-D please or as much as you can do

A working fluid at 500 kPa, 400°C is in a piston-cylinder equipment with an initial volume of 0.9 m3. The fluid undergoes an expansion process which may be described as PV = constant. The final pressure is 200 kPa. Calculate the work for this process in kJ.

50 btu of heat are added to a gas at a constant temperature of 600 F. How much of this heat is available with a refrigenerator temperature of 68 F?

2.3 A Carnot refrigerator operates with Refrigerant 134a as a refrigerant con- densing at 50°C and evaporating at –15°C. Find its COP using the Carnot expression as well as the properties of R134a. Also determine the power consumption per ton of refrigeration.

A bio-reactor is kept at 42°C by a heat pump driven by a motor of 2 kW. The reactor loses energy at a rate of 0.5 kW per degree difference to the colder ambient. The heat pump has a COP that is 50% that of a Carnot heat pump. What is the minimum ambient temperature for which the heat pump is sufficient?

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3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 28 kW. The actual C.O.P. of the refrigeration plant used is one fourth that of an ideal plant working between the same temperatures. Find the power required to drive the plant.

3.0 A cold storage is to be maintained at -5°C while the surroundings are at 35°C. The heat leakage from the surroundings into the cold storage is estimated to be 30 kw. The actual C.O.P. of the refrigeration plant used is one third that of an ideal plant working between the same temperatures. Find the power required to drive the plant.

A steam turbine receives 0.52 MPa of steam at 300 C. Then expand in an irreversible adiabatic process to a pressure of 0.012 MPa. If the exhaust steam is dry and saturated, calculate:a. The work of an irreversible processb. The efficiency of the process.