Optimization of operating temperatures in the gas operated single to triple effect vapour absorption refrigeration cycles. (October 2017)

• Record Type: Journal Article
• Authors: Azhar, Md; Siddiqui, M. Altamush
• Is Part Of: International journal of refrigeration. Volume 82(2017)
• Page Start: 401
• Page End: 425
• Publication Date: 2017-10
• Subjects: Triple Effect -- Gas energy sources -- LiBr–H2O -- Coefficient of performance -- Optimum generator temperature -- Optimum condenser temperature -- Salt concentration; Triple effet -- Sources d'énergie à gaz -- LiBr–H2O -- Coefficient de performance -- Température optimale du générateur -- Température optimale du condenseur -- Concentration de sel; Refrigeration and refrigerating machinery -- Periodicals; 621.56
• DOI: 10.1016/j.ijrefrig.2017.06.033
• Languages: English
• ISSNs: 0140-7007

Abstract

Highlights: Operating parameters of single effect is optimized in one step for maximum COP. Operating parameters of double effect is optimized in two steps for maximum COP. Operating parameters of triple effect is optimized in three steps for maximum COP. Minimum flow rates of LPG and CNG are found at different conditions. Irreversibility induced in condenser-generator sets is investigated. Abstract: Thermodynamic analysis of LiBr–H2 O single, double and triple effect vapour absorption cycles has been carried out using LPG and CNG as sources of energy. Optimization of operating temperatures in single to triple effect cycles has been carried out for maximum COP of the system and minimum gas requirement in it at desired temperatures in evaporator, absorber and main condenser using iterative technique. In single effect cycle, optimum temperatures in main generator have been obtained, while in double effect cycle, low pressure generator, high pressure condenser and main generator temperatures have been optimized. In triple effect cycle having three condensers and three generators, condenser temperatures (Tc3 and Tc4 ) and generator temperatures (Tg2, Tg3 and Tg ) have been optimized. The maximum COP of triple effect cycle goes up to 1.955 which is around 132% higher than single effect cycle with its gas requirement reduced to around 122% at the same conditions.