Compare the thermal efficiency and turbine-exit quality (temperature if superheated) at the condenser pressure for a simple Rankine cycle and the reheat cycle when the boiler pressure is 5 MPa, the boiler exit temperature is 500°C, and the condenser pressure is 20 kPa. The reheat takes place at 0.5 MPa and the steam leaves the reheater at 500°C. (Enthalpies are in KJ/kg.) Without the reheater, the heat added is: The enthalpy entering the condenser is: The net Work is: The enthalpy entering the reheater is: Without the reheater, the net Work is:

Compare the thermal efficiency and turbine-exit quality (temperature if superheated) at the condenser pressure for a simple Rankine cycle and the reheat cycle when the boiler pressure is 5 MPa, the boiler exit temperature is 500°C, and the condenser pressure is 20 kPa. The reheat takes place at 0.5 MPa and the steam leaves the reheater at 500°C. (Enthalpies are in KJ/kg.) Without the reheater, the heat added is: The enthalpy entering the condenser is: The net Work is: The enthalpy entering the reheater is: Without the reheater, the net Work is:

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

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

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Why is two-stage compression popular for extra-low-temperature refrigeration systems?
Compare the thermal efficiency and turbine-exit quality (temperature if superheated) at the condenser pressure for a simple Rankine cycle and the reheat cycle when the boiler pressure is 5 MPa, the boiler exit temperature is 500°C, and the condenser pressure is 20 kPa. The reheat takes place at 0.5 MPa and the steam leaves the reheater at 500°C. (Enthalpies are in KJ/kg.) Without the reheater, the enthalpy at the turbine exhaust is: Without the reheater, the quality at the turbine exhaust is: The pump work is: The enthalpy leaving the reheater is: The thermal efficiency is:
Compare the thermal efficiency and turbine-exit quality (temperature if superheated) at the condenser pressure for a simple Rankine cycle and the reheat cycle when the boiler pressure is 5 MPa, the boiler exit temperature is 500°C, and the condenser pressure is 20 kPa. The reheat takes place at 0.5 MPa and the steam leaves the reheater at 500°C. (Enthalpies are in KJ/kg.) Without the reheater, the thermal efficiency is: The temperature at the exhaust of the low-pressure turbine is: The throttle enthalpy is: The heat added in the boiler is: The enthalpy at the suction of the pump is:
Find the net work.
In a reheat cycle steam at 8.0 MPa and 485 degrees Celsius enters the turbine and expands to1.4 MPa. At this point, steam is withdrawn and passed through a reheater. It re-enters theturbine at 1.3 MPa and 720 degrees Celsius. Expansion now occurs to condenser pressure of6Kpa. Determine the Qa and the Cycle Efficiency.
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Refrigerant 134a enters the compressor of a vapor-compression refrigeration cycle at 150 kPa as a saturated vapor and leaves at 850 kPa. The refrigerant leaves the condenser as a saturated liquid. The rate of cooling provided by the system is 7kW. a. Determine the mass flow rate of R-134a and the cop of the cycle. b. If the condenser pressure is changed to 950 kPa, find the cop of the cycle.
Consider a steam plant operating on the ideal Rankine cycle. Steam enters the turbine at 3 MPa and 350°C and is condensed in the condenser at a pressure of 10 kPa. Determine The thermal efficiency if steam is superheated to 600°C instead of 350°C in %. Include your T - S diagram on your solution SI unit plsss thankyou
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QUESTION 1 Boiler HP LP 6 Turbines Condenser Pump In a reheat ideal Rankine cycle, steam enters the high-pressure turbine at 9.0 MPa and 650°C. The steam expands until it becomes saturated vapor and then reheated to 550°C. It re-enters a low-pressure turbine and expands to a condenser pressure of 10 kPa. Determine the following: (a) Temperature, Pressure, and Enthalpy of the stream leaving the high-pressure turbine to be reheated (Stream 4) (b) Work generated by the two (2) turbines: (b) Work done on the pump: and (c) cycle efficiency. Note that the stream leaving the low-pressure turbine can either be a wet steam or a superheated steam. As part of your solution, fill up the table below. Stream P (in bar) (in kJ/kg) S (in kJ/kg-K) (you do not need to completely fill this table, only those needed in the calculations) WT
Steam enters the turbine at 2.5 bar and the condenser at 0.5 bar in an ideal RankineCycle. Determine the thermal efficiency of the cycle.
In an ideal reheat-regenerative cycle, steam enters the turbine at 6 MPaa and 400°C. After expansion to 1.4 MPaa steam is withdrawn and reheated to 300°C. Extractions for regenerative heating occur at 0.15 MPaa and 1.4 MPaa and the condenser pressure is 0.01MPaa. Use mass flowrate of 1 kg/s.