SITUATIONAL PROBLEM NO IVA reheat cycle with two stages of reheating is executed with steam expanding initially from20MPA and 540degC. The two reheater pressures are 3.8MPA and 0.97MPa, and the steam leaverseach reheater at 540degC. Condensation occurs at 60degC. For an Ideal cycle of 1kg/s of steamfind:14. Heat Added15. Turbine Work16. Heat Rejected17. Pump Work18. Net Work19. Thermal Efficiency of the system

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Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Problem 1.1MA

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A reheat-regenerative Rankine cycle uses steam at 8.4 MPa, 560°C and expands to 0.7 MPa. The cycle includes one steam extraction stage for regenerative feedwater heating the remainder at this point being reheated to 540°C. The open feedwater heater pressure is 2 MPa. The condenser pressure is 0.01 MPa. The reheater pressure is 0.7 MPa. Compute the energy chargeable to the cycle (heat added to the boiler + heat added to the reheater) in kJ/kg. Use the unrounded value of z when needed.
An Ideal Rankine cycle operates on a boiler and condenser pressure of 2MPa and 20kPa respectively. Steam leaves the boiler at 500C. The cycle produces a Net Power of 10MW. Determine the a.) Thermal efficiency of the cycle(%), b.) steam rate of the turbine. (kg/kW-hr), and c.)heat rate of the cycle (kJ/kW-hr) PLS SHOW COMPLET SOLUTIONS
3) A cascade refrigeration system uses R22 in the low temp unit and R12 in the high temp unit. The system develops 28 kW of refrigeration at -45°C. The R12 system operates at -12°C evaporating temp and 40°C condensing temp. There is a 10° overlap of temperatures in the cascade condenser. Calculate the power required by R22 compressor, and the power required R12 compressor.
Question 2: (a) The pressure at which the steam should be reheated. (b) The thermal efficiency of the cycle. (c) Total heat input (Qin) (d) Total turbine work output (Wtur.out) (e) Draw the T-S diagram Notes: Assume the steam is reheated to the inlet temperature of the high-pressure turbine. • The moisture content of the steam at the exit of the low-pressure turbine is not to exceed 9.5% Boiler 650 C 17.5 MPa ww Reheater High-P turbine P₁ = Ps= Preheat Pump Low-P turbine Condenser e 15 KPa

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