3. In a 12 tones refrigeration ammonia plant, compression is carried out in two stages with water and flash intercooling and water sub-cooling. Condenser pressure, evaporator pressure and flash intercooler pressures are 12 bar, 3 bar and 6 bar respectively. If the limiting temperature for intercooling and sub-cooling is 20°C, determine the following: (i) the coefficient of performance of the plant. (ii) the power required for each compressor swept volume for each if volumetric efficiency of each of the compressors is 82%. (iii) the

3. In a 12 tones refrigeration ammonia plant, compression is carried out in two stages with water and flash intercooling and water sub-cooling. Condenser pressure, evaporator pressure and flash intercooler pressures are 12 bar, 3 bar and 6 bar respectively. If the limiting temperature for intercooling and sub-cooling is 20°C, determine the following: (i) the coefficient of performance of the plant. (ii) the power required for each compressor swept volume for each if volumetric efficiency of each of the compressors is 82%. (iii) the

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Steam at 44 bar and a dryness fraction, x = 0.9 is throttled to a pressure of 12 bar. Calculate thedifference in power output in kilowatts between the following two expansion processes:a) Steam at the initial pressure of 44 bar and x = 0.9 at State 1 is expanded in a turbine to State 3 at 0.12 bar.b) Steam at the reduced pressure of 12 bar after throttling at State 2 is expanded in another turbine to State 4 at the same exhaust pressure of 0.12 bar.The mass flow rate of steam is 8 kg/sec in both cases and the expansion in both turbines can be assumed to be reversible and adiabatic. Sketch both expansion processes on the same T-s diagram using the respective initial and final state points as described above.Explain the reason for the difference in power output.Calculate the mass flow rate of steam for the turbine operating at the throttled/reduced pressure to generate the same output as the turbine operating at the pressure before throttling.NOTE: You are required to number the state…
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