Numerical and experimental investigation for cooling

مقدم أطروحة جامعية

Mahdi, Qasim Salih

الجامعة

الجامعة التكنولوجية

الكلية

-

القسم الأكاديمي

قسم الهندسة الكهروميكانيكية

دولة الجامعة

العراق

الدرجة العلمية

دكتوراه

تاريخ الدرجة العلمية

2004

الملخص الإنجليزي

Theoretical and experimental studies were conducted on open type draft water cooling tower, where heat and mass transfer take place form the warm water to the bulk air which passes through the tower.

The theoretical part includes a computational simulation for a counterblow cooling tower.

The simulation is represented through the solution of the governing equations for a cooling tower.

The governing equations consist of momentum conservation equations for air (Navier-Stokes equations) in, three dimension, mass conservation equations of air and water, energy equation, air moisture fraction and water enthalpy equation.

The effect of turbulence is simulated using the k-s model.

The solution methodology was implemented through the development of Fortran 90 computer program using finite volume techniques.

The results show the reasonable behavior of air and water,, also the heat and mass transfer along the tower, under variable conditions like inlet water temperature, inlet air wet bulb temperature, (mw / ma) ratio.

And two different types of peaking (aluminum and ceramic fill).

Theoretical results show that for each (5 °C) increase in inlet water temperature causes an increase in the air enthalpy about (11.5 %), but the air moisture increase about (20.9 %).

Water enthalpy decreases along the tower.

This decrement depends upon the inlet water temperature.

The increasing rate of heat and mass transfer depends upon the increment of inlet water temperature and the decrement of AWBT.

These results are corresponding to packing height of 1.27 m, t adb = 44 °C, Ka=0.322.

These results prove that the simulation has succeeded in the representation of the experimental work.

التخصصات الرئيسية

الهندسة الميكانيكية

الموضوعات

• النماذج الرياضية

• APA
• MLA
• AMA

لغة النص

الإنجليزية

نوع البيانات

رسائل جامعية

رقم السجل

BIM-305818