د.احمد صالح شاكر العكايشي

Solar-driven absorption refrigeration technology has the potential to reduce the peak electricity demand and global warming. Optimization of this technology can change the future energy economy of the world. Herein, the straightforward and inexpensive preparation of new stable aqueous solution for direct solar absorption refrigeration systems is reported. Standard copper solution can be added to the aqueous lithium bromide solution used in absorption refrigeration systems in a simple one-step process under ambient conditions. The resulting solution is multifunctional as it improves the steam absorption in the absorber, absorbs the solar energy and converts it directly to heat, enhancing the efficiency of steam generation in the generator. Experiments to measure the viscosity, thermal conductivity, transmittance, photo-thermal conversion and steam absorption are demonstrated. The results show an enhancement of ~32.5% in the direct photo-thermal conversion and ~10.5% in the steam absorption rate, and negligible change in the viscosity and thermal conductivity of the new aqueous solution comparing to the conventional one. Thus, this stable new solution might be considered as an alternative of nano solutions and it has the potential to improve the solar absorption refrigeration technology, reducing the size and cost and saving Earth.

The hydrodynamic behaviour of gas-solid mixtures inside Bed Fluidised Beds (BFB) gasifiers has a major impact on the gasification process due to particles - gas and particle - particle contact mechanisms. The Discrete Phase Model DPM with Multiphase Particle-in-Cell method MPPIC was used as a CFD approach to study the hydrodynamic behaviour of an 800 height x 83 mm φ prototype fluidised bed gasifier with 4 different perforated plate distributors. In terms of bubble forming, pressure drop and superficial velocity, the type D distributor, i.e. triangular, had the best performance among the other types and in turn better bed height and bed movement, thus allowing best fluidisation performance as a consequence of better flow distribution.

برعاية السيد عميد كلية الهندسة الاستاذ الدكتور حسن مهدي الخطيب إقامة كلية الهندسة في جامعة الكوفة وبأشراف مسؤول وحدة التأهيل والتوظيف الدكتور حازم جاسم الطالقاني ندوة عن كيفية كتابة البحوث والاطاريح باستخدام برنامج (LATEX)في قسم الهندسة الميكانيكية قاعة المرحوم الدكتور منير المظفر ( رحمه الله ). ادار الندوة الأستاذ المساعد الدكتور احمد صالح العكايشي والدكتور علي محمد حسين من قسم الهندسة الميكانيكية، حيث تم التطرق في هذه الندوة الى (العمل على البرنامج وكيفية ادخال النص والصور والمعادلات والتعديل عليها وطريقة الاقتباس وإدخال الجداول).