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2003 Course Refrigeration & Air Conditioning

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Total No. of Questions : 12] P1042 [Total No. of Pages : 6 [3864]-153 B.E. (Mech.) S/W REFRIGERATION AND AIR CONDITIONING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 4) Assume suitable data, if necessary. SECTION - I Q1) a) Discuss the advantages of air as a refrigerant in air- craft. [4] b) Explain necessity of air-craft refrigeration. [4] c) Explain the analysis of simple air -refrigeration system with the help of p-h diagram. [8] OR Q2) a) b) An aircraft is cruising with a speed of 900km/h at an altitude of 11000 m, where the ambient conditions are 0.3 bar and -30o C. Assuming the compression ratio 5, cabin pressure 0.8 bar and air leaving the cabin at 27o C, obtain the power for pressurization and refrigeration and COP. The flow rate through the system is 1 kg/s. [12] Explain the term Ram Efficiency . [4] Q3) a) Differentiate between dry compression and wet compression. Why expansion device is used in VCC instead of expander. Discuss with the help of P-V and T-S diagram. [8] b) An ice production machine produces 20 tons of ice in 24 hours when water is supplied at 0o C. The temperature range of the machine is - 15o C to 25o C. The vapour leaves the compressor in dry and saturated conditions and there is no under-cooling in the condenser. If the actual C.O.P., is 75% of theoretical, find the power required of a compressor. P.T.O.

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