An air refrigeration system operating on Bell Coleman cycle, takes in air from cold room at 268 K and compresses it from 1.0 bar to 5.5 bar. The index of compression being 1.25. The compressed air is cooled to 300 K. The ambient temperature is 20°C. Air expands in an expander where the index of expansion is 1.35. Calculate : (i) C.O.P. of the system (ii) Quantity of air circulated per minute for production of 1500 kg of ice per day at 0°C from water at 20°C. (ii) Capacity of the plant in terms of kJ/s. Take e, : Latent heat of ice = 335 kJ/kg. = 4.18 kJ/kg K for water, e, = 1.005 kJ/kg K for air %3D [Ans. 1.974 ; 5.814 kg/min ; 7.27 kJ/s)

An air refrigeration system operating on Bell Coleman cycle, takes in air from cold room at 268 K and compresses it from 1.0 bar to 5.5 bar. The index of compression being 1.25. The compressed air is cooled to 300 K. The ambient temperature is 20°C. Air expands in an expander where the index of expansion is 1.35. Calculate : (i) C.O.P. of the system (ii) Quantity of air circulated per minute for production of 1500 kg of ice per day at 0°C from water at 20°C. (ii) Capacity of the plant in terms of kJ/s. Take e, : Latent heat of ice = 335 kJ/kg. = 4.18 kJ/kg K for water, e, = 1.005 kJ/kg K for air %3D [Ans. 1.974 ; 5.814 kg/min ; 7.27 kJ/s)

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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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

4. An air refrigeration system operating on Bell Coleman cycle, takes in air from cold room at 268 K and
compresses it from 1.0 bar to 5.5 bar. The index of compression being 1.25. The compressed air is cooled to
300 K. The ambient temperature is 20°C. Air expands in an expander where the index of expansion is 1.35.
Calculate : (i) C.O.P. of the system (ii) Quantity of air circulated per minute for production of 1500 kg of ice
per day at 0°C from water at 20°C. (iii) Capacity of the plant in terms of kJ/s.
Take c, = 4.18 kJ/kg K for water, e, = 1.005 kJ/kg K for air
Latent heat of ice = 335 kJ/kg.
[Ans. 1.974 ; 5.814 kg/min ; 7.27 kJ/s]

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