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IJSTR >> Volume 9 - Issue 12, December 2020 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Evaluation Of The Thermal And Hydraulic Performance Of A Double Pipe Heat Exchanger By Use Of Various Porous Structures

[Full Text]



Ali Azeez Ali ALI, Ibrahim KOC, Ehsan Fadhil ABBAS



Double pipe heat exchanger, Concentric heat exchanger, thermal performance, pressure drop, porous medium, counter flow, parallel flow



The present study includes the evaluation of heat transfer enhancement of a double heat exchanger filled with five different porous materials, such as steel, ceramic, glass, plastic, and wood in the form of balls. The results are compared with the results of the heat exchanger without porous. Experiments were conducted on a double-core heat exchanger with dimensions of inner and outer diameter 20.7 and 22.2 mm and a length of 1.94 m of copper inner tube, inserted into the galvanized pipe with an inner diameter of 42.7 mm, wall thickness 2.15 mm, length 1.8 m, its outer surface insulated to prevent heat loss to the ambient. Experiments were performed under working conditions for hot and cold water flow ranging from 1 to 4 LPM and hot and cold water inlet temperature (60±2oC and 28±3oC), respectively, by two flow arrangements (parallel and counter flow). The results showed that steel balls give the highest effectiveness and number of transfer units, among other kinds of porous materials, where the ratio of improvement in their effectiveness relative to the non-porous state is about 60%. On the other hand, the use of porous materials leads to an increase in pressure drop, but the advantage of enhanced heat transfer was higher than the energy consumption by the pump. Where the highest pressure drop obtains in the ceramic case, which ranged from 20 to 178 mmHg.



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