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2003 Course Refrigeration & Air Conditioning

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Total No. of Questions : 12] P1185 [Total No. of Pages : 6 [3664]-143 B.E. (Mech. SW) REFRIGERATION AND AIR CONDITIONING (2003 Course) Time : 3 Hours] [Max. Marks : 100 Instructions to the candidates: 1) 2) 3) 4) 5) 6) Answer any three questions from each section. Answers to the two sections should be written in separate books. Neat diagrams must be drawn wherever necessary. Figures to the right indicate full marks. Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. Assume suitable data, if necessary. SECTION - I Q1) a) Explain Steam Jet refrigeration system with neat sketch. [8] b) Explain Reduced ambient air-refrigeration cycle. Why it is called reduced ambient? [8] OR Q2) a) Define the terms COP, EER, SEER, IPLV. [8] b) A reversed cycle has refrigerating COP of 4, [8] i) Determine the ratio T1/T2. ii) If the work done on the cycle is 10 kW, determine the maximum refrigerating effect in TR. iii) If this cycle is used as heat pump, determine the COP and heat delivered. Q3) a) Define the following : i) ODP ii) GWP. iii) TEWI. [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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