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2003 Course Refrigeration & Air Conditioning

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Total No. of Questions : 12] P1319 [Total No. of Pages : 6 [3764]-153 B.E. (Mech. Sand) REFRIGERATION AND AIR CONDITIONING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer 3 questions from Section-I and 3 questions from Section-II. 2) Answers to the two sections should be written in separate answer books. 3) Neat diagrams must be drawn wherever necessary. 4) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 5) Assume suitable data, if necessary. SECTION - I Q1) a) Discuss the advantages of air as a refrigerant in air-craft. Explain necessity of air-craft refrigeration. [8] b) Explain Regenerative air-refrigeration system. Compare it with simple system. [8] OR Q2) a) An air craft refrigeration plant has a capacity of 30 TR. The ambient temperature is 17 C. The atm.air is compressed to 0.95 bar and 30 C due to ram action. The air is then further compressed in a compressor to 4.75 bar and then is cooled in a heat exchanger to 67 C. It then expands in a turbine to 1 bar before supply to the cabin. Air leaves the cabin at 27 C. The isentropic efficiency of the compressor and the turbine are 0.9. Determine i) mass flow rate circulated/min ii) COP [12] iii) power required. b) Explain the term Ram Efficiency . Q3) a) What are limitations of air refrigeration system? [4] [4] b) What is difference between retrofitting and drop in? What are the modifications made in R-12 system to make it suitable for HFC-134a refrigerant? [4] P.T.O.

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