Chapter 5, Problem 5.71P

4.105 Separate streams of steam and air flow through the tur- bine and heat exchanger arrangement shown in Fig. P4.105. Steady-state operating data are provided on the figure. Heat transfer with the surroundings can be neglected, as can all kinetic and potential energy effects. Determine (a) T3, in K, and (b) the power output of the second turbine, in kW. W 10,000 kW WE2 ? Turbine Turbine P3= 10 bar T3 = ? T2= 400°C Pz= 10 bar T 240°C P4=1 bar Steam www www in 1. 4. T = 600°C P=20 bar Ts 1500 K 5 Ps 1.35 bar m= 1500 kg/min Heat exchanger VT= 1200 K P6=1 bar Air in

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P.4 As an example of a system, consider a water heater, a. What is in the system? b. What is outside the system? c. Is the system open or closed?

.11 The refrigerator (R) shown in Fig. F3.i! is a closed syster: thet oper- ates in cycles while in communication with the cold space (T;) and the building (T). The refrigeration load (QL) reaches the cold space by leak- ing from T to T across the thermal insulation system (I), which is a closed system operating steadily. If the work required by the refrigera- tor is WR, what is the net heat transferred by systems (R) and (I) to the building (Tg)? The net heat transferred by (R) and (I) to the building (QR) is removed by a heat pump (HP) that functions cyclically as a closed system. The heat pump requires the work WHp and rejects heat to the ambient of temperature T, which is warmer than the building. Together, the closed systems (R), (I), (B), and (HP) perform the function of removing the refrigeration load Q, by rejecting heat to the ambient T. T (В) Тв (HP) E WHP WR (R) (I) TL Te, Figure P3.11 38 ENTROPY GENERATION, OR EXERGY DESTRUCTION The total work requirement is WR + WHP, and…

Thermodynamics I

1. A pump is used to lift 11 CMH of water at 20°C from a nearby fresh water lake whose free surface is 2.5 meters below the pump centerline to an elevated water dam whose free surface is 10 meters above the pump centerline. The suction pipe and discharge pipe are DN 8 SCH 40 and DN 10 SCH 40, respectively. The suction pipe has a total length of 5.4 m, while the discharge pipe has a total length of 21 m. Assume Hazen-Williams coefficient of 140 for both suction and discharge pipes and ignore minor head losses. a. Draw a schematic of the problem. Clearly indicate the elevations with respect to the pump centerline. b. Calculate the total dynamic head of the pump in meters. c. Calculate the water power output of the pump in kW. d. Calculate the brake power input to the pump in kW, assuming a pump mechanical efficiency of 75%. e. Calculate the electrical power input to the pump in kW, assuming a motor efficiency of 90%.

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1. Discuss the concepts of Archimedes principle. 2. Discuss the three forms of energy: Potential energy, Kinetic energy, Flow or Pressure energy

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