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Heat and Mass Transfer in Open Evaporative Cooling System Using Various Types of Fills in Oil Industry

Author: Dr.Nagam Obaid Kariem
Journal: Journal of Petroleum Research & Studies مجلة البحوث والدراسات النفطية ISSN: 22205381 Year: 2012 Volume: 261 Issue: 5th Pages: 93-121
Publisher: Ministry of Oil وزارة النفط

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Abstract

This research work is to study the performance of evaporative cooling system using new type of packing with different shapes (saddle, counter current wavy, and triangular splash) and materials (glass, thermoplastic, and resistance wood) of packing for an air –water cooling system . The basis of the installation is the evaporative cooling system,1.75 m height and 40 x 40 cm outside cross section. The fluids in this system are air which moving from the bottom to the top of cooling system (mass flow rates ranging between 0.07 and 0.18 kg/s) and the water which are moving from top to bottom of cooling evaporator ((mass flow rates ranging between 0.11 and 0.27kg/s)). The inlet water temperatures rangingbetween 35 and 55oC .The packing heights were changed during the research in order to get the temperature profile and the relation of these temperatures with the other variables in the cooling system, the packing heights ranging between 35 to 140 cm. The overall volumetric heat and mass transfer coefficients and tower characteristics, were predicted as a function of the fluids flow rates.A computer program used to solve and find the relation between the variables in the system and the functions (overall volumetric heat and mass transfer coefficients, number of transfer coefficient, the temperature variation along the tower).The results show that :1-At maximum air mass flow andminimum water mass flow, themass transfer coefficients wouldbe on the maximum value andvice-versa.2- The thermoplastic packing wasmuch more efficient than glassand wood by efficiency about 12to 18 %. ,also the results showedthat The triangular packing wasmuch more efficient than wavyand glass by efficiency about 5 to11 %.3-The temperatures distributionwere not constant in all layers; the temperatures distribution in the first layer were not very well, this happened because the distribution of water in the packing surface was just know happened, while in the other layers the temperature distrib-ution and profile were so good.

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