RAC- a refrigeration plant working on Bell Coleman cycle, air is compressed to 6 bar from 1 bar Its initial temperature is 300 K After compression, the air is cooled up to 350 K in a cooler before expanding back to a pressure of 1 bar Determine the theoretical COP of the plant and net refrigerating effect Take cp, = 1.005 kJ/kg K and cv = 0.718 kJ/kg K

RAC- a refrigeration plant working on Bell Coleman cycle, air is compressed to 6 bar from 1 bar Its initial temperature is 300 K After compression, the air is cooled up to 350 K in a cooler before expanding back to a pressure of 1 bar Determine the theoretical COP of the plant and net refrigerating effect Take cp, = 1.005 kJ/kg K and cv = 0.718 kJ/kg K

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

Chapter45: Domestic Refrigerators And Freezers

Section: Chapter Questions

Problem 12RQ: Refrigerators currently being manufactured in the United States are using______as their refrigerant.

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a refrigeration plant working on Bell Coleman cycle, air is compressed to 6 bar from 1 bar Its initial temperature is 300 K After compression, the air is cooled up to 350 K in a cooler before expanding back to a pressure of 1 bar Determine the theoretical COP of the plant and net refrigerating effect Take cp, = 1.005 kJ/kg K and cv = 0.718 kJ/kg K
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Question An ammonia ice plant operates between a condenser temperature of 35 ℃ and an evaporator temperature of -15℃. It produces 10 tons of ice per day from water at 30℃ to ice at -5℃. Assuming simple saturation cycle, using only tables of properties of ammonia, determine:(a) The horsepower of the compressor motor if the adiabatic efficiency of the compressor is 0.85 and mechanical efficiency is 0.95; and(b) The theoretical and actual COP
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Need help with this engineering problem. Steam enters the turbine of a simple vapor power plant with a pressure of 12 MPa and a temperature of 500°C and expands adiabatically to condenser pressure, p. Saturated liquid exits the condenser at pressure p. The isentropic efficiency of both the turbine and the pump is 84%.For p = 100 kPa, determine: (a) the turbine exit quality, in percent.(b) the cycle thermal efficiency, in percent.
A steam generator comprises a boiler, a superheater, an economizer, and an air preheater. The feedwater enters the economizer at 140 oC and leaves the boiler drum at 60 bar, 0.98 dries, and leaves the superheater at 450 oC. When using coal with a calorific value of 25.2 MJ/kg, the rate of evaporation is 8.5 kg steam per kg coal and the air-fuel ratio is 15:1 by mass. Neglecting heat losses and pressure drops, estimate the heat transfer per kg fuel in each component and the efficiency of the steam generator. What are the percentages of the total heat absorption taking place in the economizer, boiler, and superheater, respectively? Assume Cp of air and water as 1.005 and 4.2 kJ/kg-K, respectively.
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In absorption refrigeration system, the heating in generator is carried out by using steam at 3 bar and 85% dry. The refrigeration temperature is – 10 °C. The condensation of the refrigeration is carried out at 30 °C using cooling water. Determine i) maximum possible COP of the system ii) if the steam leaves the generator as saturated water at same pressure, determine the quality of steam required to run a plant of 20 tons. Assume relative COP as 0.4.