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Article
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.


Article
Effect of changing packing shapes on the evaporation rates using different combination arrangements of dry-wet cooling towers

Author: Nagam Obaid Kariem
Journal: Al-Qadisiyah Journal for Engineering Sciences مجلة القادسية للعلوم الهندسية ISSN: 19984456 Year: 2013 Volume: 6 Issue: 2 Pages: 232-246
Publisher: Al-Qadisiyah University جامعة القادسية

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Abstract

The aim of this study is reduce the evaporation rate from dry-wet cooling tower combination system through using different shapes and different arrangements between dry and wet cooling towers. Four shapes of corrugated packing were used in the study with all arrangements combination between dry and wet cooling towers in order to get the shape that give minimum evaporation rate (loss). Four arrangements combination of dry-wet cooling tower, two of arrangement were series (AS1, and AS2), and two of arrangements were parallel (AP1, andAP2). The variables for this study were obtained from North Oil Company (N.O.C.) in the Ministry of Oil of Iraq; these data included temperatures, flow rate, packing types, ambient conditions, pressure, and fan parameters. The results show that AS1 configuration produces lower evaporation rates by about 58 % reducing in percent, and then followed by the other configuration. The corrugated types 1 and 4 gives the minimum amount of evaporation losses then the other types of corrugated by about 40 %. The corrugated types 1 and 4 operated with a minimum cost of operation

الغرض من البحث تقليل معدل التبخر من منظومة ابراج التبريد الجافة-الرطبة و ذلك من خلال استعمال اشكال مختلفة من الحشوات المتموجة و كذلك من خلال الربط المختلف بين ابراج التبريد الجافة-الرطبة. تم استعمال اربعة اشكال مختلفة من الحشوات المتموجة لهذه الدراسة مع مختلف انواع الربط بين ابراج التبريد الجافة و الرطبة وذلك لغرض الحصول على الشكل المتموج الذي يعطي اقل معدل تبخير(فقدان). تضمن الربط بين الابراج الجافة و الرطبة ,ربطين على التوالي (AS1,AS2) و ربطين على التوازي (AP1,AP2). المتغيرات لهذه الدراسة بمعطيات من شركة نفط الجنوب العائدة لوزارة النفط العراقية و شملت هذه المتغيرات كل من الحرارة و نعدل الجريان و شكل الحشوات و الظروف الجوية والضغط و معاملات المروحة. بينت النتائج ان الربط AS1 ينتج اقل معدل فقدان تبخيرمن ابراج التبريد و ذلك بمعدل 40% و ثم يليه باقي انواع الربط الاخرى.بينت النتائج ان الاشكال المتموجة رقم 1 و رقم 4 تعطي اقل معدلات فقدان تبخير بمقدار 40% عن باقي انواع الاخرى من الاشكال المتموجة,كذلك لوحظ ان الشكلين المتموجين 1 و 4 يعملان باقل كلفة تشغلية للابراج .

Keywords

Cooling --- wet --- dry --- corrugated --- evaporation rate --- and combination


Article
Performance of Cooling Tower with Honeycomb Packing

Authors: Nagam Obaid Kariem --- Hayder Mohamad Jaffal
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2011 Volume: 29 Issue: 6 Pages: 1080-1093
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

The objective of this study is to investigate experimentally and theoreticallyheat and mass transfer characteristics of the cooling tower. The investigationcarried out at a mechanical forced direct cooling tower. A column-packing unit ismade of a new type of packing named honeycomb (plastic). Air and water areused as fluids and the runs are done at the air and water mass flow rates rangingbetween 0.05 and 0.15 kg/s, and between 0.1 and 0.25 kg/s, respectively. The inletwater temperatures ranging between 35 and 50 oC. A mathematical model basedon the equations of mass transfer and energy is used and solved to determine thecharacteristics of cooling tower, pressure drop, temperature ratio, and towereffectiveness. There is reasonable agreement from the comparison between thecalculated and measured data.


Article
BEHAVIOUR ANALYSIS OF DOUBLY FED INDUCTION GENERATOR BASED WIND TURBINE SYSTEM DURIN GRID DISTURBANCES

Authors: Shady Mostafa Gadoue --- Mohammed Ali Elgendy --- Nagam Obaid Kariem --- Amer Obeid Kareem
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 2 (part-6) Pages: 58-73
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The fault response of doubly fed induction generator (DFIG) based wind turbine is analyzed and summarized with vector control scheme to show the influence on the dynamic behavior of the wind turbine system against this operation condition as fault ride through (FRT) enhancement. The theoretical fault simulations for voltage sag magnitude calculation are included utilizing Simulink, based on the SimPowerSystems toolbox, and also considering protection-systems modeling for sag duration calculation.

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