1. POWER GENERATION CYCLE. A power generation cycle is operated with water as the working fluid. Steam enters the turbine at 5300 kPa and 650 °C and leaves at 101.3 kPa. It is found that 1052.2 kJ of work is produced in the turbine per kg of steam. The turbine operates adiabatically but not reversibly. The pump operates adiabatically and reversibly. Saturated liquid exits the condenser. Take a basis of 1 kg of steam. a) What is the enthalpy of the steam (kJ) leaving the turbine under the given operating conditions? b) What is the temperature of the steam (°C) leaving the turbine under the given operating conditions? c) How much work (kJ) would have been produced if the turbine operated adiabatically and reversibly between the given inlet conditions and at the exit pressure of 101.3 kPa? d) What is the isentropic efficiency of the turbine? e) How much heat is discarded from the condenser (kJ)? f) How much work is needed to operate the pump (kJ)? g) What is the efficiency of the power cycle? Boller W. (turbine) Turbine w. (pump) Condenser

1. POWER GENERATION CYCLE. A power generation cycle is operated with water as the working fluid. Steam enters the turbine at 5300 kPa and 650 °C and leaves at 101.3 kPa. It is found that 1052.2 kJ of work is produced in the turbine per kg of steam. The turbine operates adiabatically but not reversibly. The pump operates adiabatically and reversibly. Saturated liquid exits the condenser. Take a basis of 1 kg of steam. a) What is the enthalpy of the steam (kJ) leaving the turbine under the given operating conditions? b) What is the temperature of the steam (°C) leaving the turbine under the given operating conditions? c) How much work (kJ) would have been produced if the turbine operated adiabatically and reversibly between the given inlet conditions and at the exit pressure of 101.3 kPa? d) What is the isentropic efficiency of the turbine? e) How much heat is discarded from the condenser (kJ)? f) How much work is needed to operate the pump (kJ)? g) What is the efficiency of the power cycle? Boller W. (turbine) Turbine w. (pump) Condenser

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter41: Troubleshooting

Section: Chapter Questions

Problem 8RQ: When the outside ambient air temperature is 90F, the temperature of the condensing refrigerant in a...

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When the outside ambient air temperature is 90F, the temperature of the condensing refrigerant in a standard- efficiency unit should be approximately A. 120F. B. 130F. C. 140F. D. 150F.
Condensers in these refrigerators are all_______cooled.
The figure below shows a vapor power cycle that provides process heat and produces power. The steam generator produces vapor at 500 lbf/in.2, 800°F, at a rate of 8 x 104 lb/h. Eighty-eight percent of the steam expands through the turbine to 10 lbf/in.2 and the remainder is directed to the heat exchanger. Saturated liquid exits the heat exchanger at 500 lbf/in.2 and passes through a trap before entering the condenser at 10 lbf/in.2Saturated liquid exits the condenser at 10 lbf/in.2 and is pumped to 500 lbf/in.2 before entering the steam generator. The turbine and pump have isentropic efficiencies of 85% and 89%, respectively. For the process heat exchanger, assume the temperature at which heat transfer occurs is 465°F. Let T0 = 60°F, p0 = 14.7 lbf/in.2 Determine:(a) the magnitude of the process heat production rate, in Btu/h.(b) the magnitude of the rate of exergy output, in Btu/h, as net work.(c) the rate of exergy transfer, in Btu/h, to the working fluid passing through the steam…
The figure below shows a vapor power cycle that provides process heat and produces power. The steam generator produces vapor at 500 lbf/in.2, 800°F, at a rate of 8 x 104 lb/h. Fifty-two percent of the steam expands through the turbine to 10 lbf/in.2 and the remainder is directed to the heat exchanger. Saturated liquid exits the heat exchanger at 500 lbf/in.2 and passes through a trap before entering the condenser at 10 lbf/in.2Saturated liquid exits the condenser at 10 lbf/in.2 and is pumped to 500 lbf/in.2 before entering the steam generator. The turbine and pump have isentropic efficiencies of 85% and 89%, respectively. For the process heat exchanger, assume the temperature at which heat transfer occurs is 465°F. Let T0 = 60°F, p0 = 14.7 lbf/in.2 Determine:(a) the magnitude of the process heat production rate, in Btu/h.(b) the magnitude of the rate of exergy output, in Btu/h, as net work.(c) the rate of exergy transfer, in Btu/h, to the working fluid passing through the steam…
In a Reheat Cycle steam enters the turbine @ 40 bar and 400 C. It expands isentropic ally to 6 bar and is reheated at constant pressure to 400 C. This steam expanded isentropic ally to 1 bar and is reheated at constant pressure to 200 C. Finally this steam is expanded isentropic ally in the condenser pressure of 0.1 bar. Determine the thermal efficiency and the capacity of the boiler if 10,000 KW of power output is required.
A steam power plant operates on the simple ideal Rankine cycle. The steam enters the turbine at 4 MPa and 500°C and is condensed in the condenser at a temperature of 40°C. draw and label the schematic diagram and the pV and TS planes. (a) Show the cycle on a T-s diagram. If the mass flow rate is 10 kg/s, determine (b) the thermal efficiency of the cycle (c) the net power output in kW.
Steam is supplied to a two-stage turbine at 40 bar and 350 oC. It expands in the first turbine until it is just dry saturated, then it is reheated to 350 oC and expanded through the second stage turbine; the isentropic efficiencies of the first and second stage turbines are 84 % and 78 % respectively. The condenser pressure is 0.035 bar. Sketch the process on a T-s diagram and calculate;The work output and heat supplied per kg of steam for the plant assuming ideal processesThe thermal efficiency of the cycleThe specific steam consumption
In a simple power cycle that uses water, the following conditions are met: The pressure in the boiler is 3 MPa and that of the condenser is 20 kPa. The steam that comes out of the boiler is saturated and at the condenser outlet there is saturated liquid. Considering that the turbine operates in a reversible adiabatic way, determine: a) output work of the cycle, b) heat transferred in the condenser, c) the efficiency of the cycle.
Refrigerant 134a is the working fluid in a solar power plant operating on a Rankine cycle. Saturated vapor at 60 degree Celsius enters the turbine, and the condenser operates at a pressure of 6 bar. The rate of energy input to the collectors from solar radiation is 0.4 kW per m2 of collector surface area. Determine the minimum possible solar collector surface area, in m2, per kW of power developed by the plant.
Rankine cycle, the pressure and the temperature entering the turbine is 1800 Kpa at 380 Degrees celcius and the pressure leaving the turbine is 20 KPa. The quality of steam entering the condenser is 90%. What is the turbine work in Kj/Kg? A. 833.3 B. 799.9 C. 633.3 D. 423.2
Steam is supplied to a two-stage turbine at 40 bar and 350 o It expands in the first turbine until it is just dry saturated, then it is reheated to 350 oC and expanded through the second stage turbine; the isentropic efficiencies of the first and second stage turbines are 84 % and 78 % respectively. The condenser pressure is 0.035 bar. Sketch the process on a T-s diagram and calculate; i. The work output and heat supplied per kg of steam for the plant assuming ideal processes ii. The thermal efficiency of the cycle iii. The specific steam consumption
Consider a steam power plant operating on the simple ideal Rankine cycle. The steam enters the turbine at 4 MPa, 400 degrees celcius and is condensed in the condenser at a pressure of 100 kPa. Draw the schematic and T-s diagram of the cycle and determine the following per unit mass of steam. (a) Turbine work (b) Pump work (c) Heat added in the boiler (d) Heat rejected in the condenser (e) Thermal efficiency of the cycle (f) Heat rate (g) Steam rate of the cycle