Chapter 8, Problem 8.6P

During an isentropic process of 3 lb/sec of air, the temperature increases from 50 deg F to 290 deg F. Find the work for a nonflow process. -96012 BTU/s -69012 BTU/s O -123.38 BTU/s O -132.38 BTU/s

Water flowing at 5 kg/s and initially at 100 kPa, 20°C is to be delivered as steam at 2000 kPa, 350°C and the same flow rate to some application. The following two-step sequential process is employed to achieve the required delivered steam conditions:Step 1 – adiabatic compression to 2000 kPa, 20°C.Step 2 – constant-pressure heating to 350°C. How much work in kJ/s is needed in Step 1 and Step 2? What is the required heat transfer in kJ/s to accomplish Step 2?

same compressor inlet and exit conditions. Answers: (a) 4.33, ing the waste heat to the outdoor air at 34°C. The - pressor at 400 kPa as a saturated vapor at a rate of 80 L/min COP, (b) the maximum COP, and (c) the minimum volume and leaves at 1200 kPa and 70°C. Determine (a) the actual working fluid is used to keep a room at 23°C by reject- An air-conditioner with refrigerant-134a as the and lights amounts to 900 W. The refrigerant enters the com- 250 kJ/min while the heat generated by the computer, TV, gains heat through the walls and the windows at a rate of 6-108 room flow rate of the refrigerant at the compressor inlet for (b) 26.9, (c) 12.9 L/min G.000 Он 1.2 MPa 70°C Condenser Expansion valve Compressor 400 kPa Evaporator sat. vapor

Refrigerant ammonia enters the compressor of a refrigerator as superheated vapor at 0.14 MPa, -20°C at a rate of 0.04 kg/s, and leaves at 0.8 MPa, 50°C. The refrigerant is cooled in the condenser to 0.75 MPa and is throttled to 0.14 MPa. Disregarding any heat transfer and pressure drops in the connecting lines between the components, determine the rate of heat removal from the refrigerated space. kW

Problem 4 A 0.15-m rigid tank initially contains R-134a as saturated vapor R-134a at 0.6 MPa. The tank is connected by a valve to a supply line that carries R-134a at 1 MPa and 26°C. The valve is now opened, allowing the refrigerant to enter the tank, and is closed when it is observed that the tank contains only saturated liquid at 0.8 MPa. Neglecting kinetic and potential energy changes, determine, 1 MPa 26°C R-134a 0.15 m a) The mass of the refrigerant that entered the tank, in kg b) The amount of heat transfer to or from the surroundings in kJ

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how do i calculate for a power plant, iv. The rate of heat rejection at the condenser; andv. Determine the rate of entropy generation in that power plant.   Please provide example

Problem 4: In the pump of a steam power plant, saturated liquid at 75 kPa pressure is compressed to 3 MPa pressure. Since the adiabatic efficiency of the pump is 85%, find the work consumed by the pump.

Steam at 28 bar and 50 degrees Celsius superheat is passed through a turbine and expanded to a pressure where the steam is dry and saturated. It is then reheated at constant pressure to its original temperature and then expanded to the condenser pressure of 0.2 bar. The expansion being isentropic. Draw the T-S diagram. Find (a) Work done per kg of steam and (b) thermal efficiency with and without reheats