- Slides: 9
Refrigeration Satish Raghuvanshi
Introduction Refrigeration Methods of Refrigeration Unit of Refrigeration
VARS over VCRS
Advantages of VARS Over VCRS • VAR system uses heat energy. while VCR system uses mechanical energy to change the condition of the refrigerant from the evaporator. • Elimination the use of CFC and HCFC Refrigerants. • The load variation does not put any effect on performance of VAR system. • Quiet Vibration Free Operation • High Reliability and Low Maintenance. • VAR systems can be built in capacities well above 1000 tonnes of refrigeration each which is largest size for single compressor unit.
Main Components of System- • • Absorber Pump Pressure reducing valve Generator Condenser Expansion valve Evaporator Heat exchanger
Refrences:  Myat A. , Thu K. , Kim Y-D, Chakraborty A. , Chun W. C. and Ng K. C. “A Second Law Analysis and Entropy Generation Minimization of an Absorption Chiller, ” Applied Therm. Eng. , 31, 2405 (2011).  Renjith V. R. and Joshy P. J. , Vapour Absorption Refrigeration System using Low-grade Energy – an Ecofriendly Approach, Proc. First Int. Seminar on Safety and Fire Eng. SAFE ’ 99, Cochin, Nov 24 – 26 (1999), p. 465.  Sencan A. , Yakut K. A. and Kalogirou S. A. , “Exergy Analysis of Lithium Bromide Water Absorption System”, Renewab. Energy, 30, 645 (2005).  Siddiqui M. A. , “Economic Analyses of Absorption Systems: Part B Optimization of Operating Parameters”, Energy Convers. Mgmt. , 38(9), 905 (1997).
Contd…  Wu T. , Wu Y. , Yu Z. , Zhao H. and Wu H. , “Experimental Investigation on an Ammonia-Water-Lithium Bromide Absorption Refrigeration System without Solution Pump”, Energy Convers. Mgmt. , 52, 2341 (2011). Text Books: Nag P. K (Engineering Thermodynamics) sixth Edition (2012) Yunus A. Cengel ( Engineering Thermodynamics) Eight Edition (2015) Arora C. P (Refrigeration and Air conditioning) Sixth Edition (2013)