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Journal of Applied Sciences

Year: 2012 | Volume: 12 | Issue: 24 | Page No.: 2580-2585
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Authors

Mojahid Sid Ahmed Mohammed Salih Ahmed

Syed Ihtsham Ul-Haq Gilani

Keywords

Exergy analysis of a double-effect parallel flow commercial absorption chiller is presented in this study. Generally a major obstacle for developing model of a commercial absorption chiller is lack of available component specifications. These specifications are commonly proprietary of the chillers manufacturers and normally the available information is not sufficient. This study presented a double-effect parallel-flow-type steam absorption chiller model based on mass and energy equations. The chiller studied is 1250 RT (Refrigeration Tons) using lithium bromide-water solution as working pair. For refrigerant and absorbent properties, set of efficient formulations are used. The model gives the required information about temperature, concentration, entropy, exergy and flow rate at each state point of the system. The model calculates the heat load at each component as well as the performance of the system. The profile of the exergy destructions for various components is plotted against the heat load in the range of 20-100% of cooling capacity. The results showed that the high temperature generator has the greatest exergy destruction followed by the absorber and high temperature solution heat exchanger. Further, it was found that the Coefficient of Performance (COP) increased with increasing with load factor. However, the exergetic efficiency was found to decrease while increasing the load factor.
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