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Prof. aref mohamed ahmed soliman :: Publications:

Title:
Study to enhance the Performance of air cooling system by mixing direct expansion unit and chilled water system
Authors: M. Attalla, A. M.A. Soliman, A. Abd El-Naeem
Year: 2012
Keywords: Modified VCR cycle, Energy recovery, Pre-cooling system, Water cooled condenser.
Journal: International Journal of Engineering Science and Technology
Volume: 4
Issue: 12
Pages: 4981-4989
Publisher: International Journal of Engineering Science and Technology (IJEST),ISSN : 0975-5462
Local/International: International
Paper Link: Not Available
Full paper aref mohamed ahmed soliman _-IJEST12-04-12-096.pdf
Supplementary materials Not Available
Abstract:

The proposed system consists of two air conditioning sub systems. The first is a water cooling heat exchanger system which works as an air pre-cooler for the conventional mechanical vapor compression refrigeration system (VCR). The proposed system is using (R-22) as a refrigerant which is investigated for warm and hot climates. The results indicate that by using indirect heat exchanger system can reduce cooling load from 6% to 40% during cooling season and also from 10 % to 16 % reduction in electrical energy consumption for the used unit 2.02 hp along the test rig running. Moreover the heat recovery system and its open cooling water cycle on the water cooled condenser save a hot water temperatures ranged from (30 oC – 35 oC) available for using continuously as the VCR system running. From the other side, the water cooled condenser removes back pressure on the compressor better than air cooled condenser, which will increase compressor operation life. Improve the performance of the refrigeration unit by combined a pre- cooling system to remove a part from the sensible in the outdoor air and this will occur by studying the work experimental and theoretical. Its experimental relevance studies the performance of the new system through calculating the cooling capacities of the new system. The theoretical expectation of the performance of the new system by changing parameters the same in experimental plus other parameters done in theoretical model only such as water heat exchanger cooling water temperature and flow rate, and water heat exchanger effectiveness.

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