Define: Refrigeration, Refrigerant, Refrigerator, Refrigerating Effect, and Coefficient of Performance.
[5 marks]State and briefly explain the methods of Refrigeration.
[5 marks]Discuss the advantages of dense air refrigerating system over open air refrigeration system.
[5 marks]Explain in brief Carnot Cycle for refrigeration.
[5 marks]Explain units of refrigeration and define 1 Ton of Refrigeration.
[5 marks]Explain Air Refrigeration Cycle in detail.
[5 marks]Derive equation of COP for Air Refrigeration Cycle.
[5 marks]Draw schematic diagram of Bell-Coleman Cycle.
[5 marks]In a refrigeration plant working on Bell-Coleman cycle, air is compressed to bar from 1 bar. Its initial temperature is 10 °C. After compression, the air is cooled up to 20 °Cin a cooler before expanding back to pressure of 1 bar. Determine the theoretical C.O.P. of the plant and net refrigerating effect. Take Cp = 1.005 KJ/kg Kand Cv = 0.718 KJ/kg K.
[5 marks]Explain Standard Vapour Compression Refrigeration System with T-Sand P-H diagram.
[5 marks]Explain effect of Sub cooling in detail.
[5 marks]Explain different methods of improving the COP of simple compression refrigeration cycle.
[5 marks]Why compression process is required in VCR system? Explain in brief.
[5 marks]Give comparison between Vapour compression and Vapour absorption refrigeration system.
[5 marks]What are the Function of following Components in VAR: 1. Absorber 2. Rectifier 3. Analyser 4. Heat Exchanger
[5 marks]Explain Construction and working of simple Ammonia-Water (NH -H O) vapour absorption system with neat sketch
[5 marks]What are the requirements of refrigerant-absorbent mixture to use it in vapour absorption system?
[5 marks]