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Article
Development Of Absorption Cooling System Work By Using Solar Energy
تطوير عمل منظومة التبريد الامتصاصية باستخدام الطاقة الشمسية

Author: Hashim A.Hussain هاشم عبد حسين
Journal: Al-Rafidain University College For Sciences مجلة كلية الرافدين الجامعة للعلوم ISSN: 16816870 Year: 2013 Issue: 32 Pages: 131-160
Publisher: Rafidain University College كلية الرافدين الجامعة

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Abstract

This paper is devoted to optimize the performance of absorption cooling system working with on solar energy .It aims at reducing the cost of the absorption cooling system and reducing the temperature of the generator to enable the cooler to work with solar collector more economical and to reduce the energy consumption compared with classical cooling system.The COP has been studied for four absorption systems which using water and lithium- Bromide. The temperature of the generator for each cycle was determined according to the (pressure – temperature –concentration) diagram. The COP has been determined by drawing it’s the change with the change of temperature of the generator after determination of condensation and evaporation temperature. The results of this work indicated that, the COP. for double effect cycle is high respectively, but it requires expensive solar receivers.

يهدف البحث إلى اختيار منظومة التبريد الامتصاصية الأكثر ملائمة للعمل في استخدام الطاقة الشمسية للحصول على الحرارة اللازمة لتشغيلها لتطوير نظام تبريد الهواء بتكاليف استثمارية اقل بايجاد معامل اداء مقبول ودرجة حرارة مولد منخفضة نسبياً تمكن المبرد من العمل باستخدام لواقط شمسية مسطحة أكثر اقتصادية والهدف الثاني هو تخفيض استهلاك الطاقة مقارنة مع أنظمة التبريد التقليدية . تم دراسة تغير معامل الأداء لمنظومات التبريد الامتصاصية المستخدمة لمحلول بروميد الليثيوم والماء لأربعة أنواع من هده المنظومات لتحديد معامل الأداء لكل منظومة والمقارنة بينهما لاختيار الأفضل . تم تحديد مجال درجة حرارة المولد لدوائر التبريد الأربعة اعتمادا على مخطط الضغط ودرجة الحرارة والتركيز. اعتمدت هده الدراسة على طريقة حل باستخدام الجداول والمخططات وطريقة الحل باستخدام برنامج EES. وتم دراسة أداء منظومات التبريد الامتصاصية الأربعة من خلال رسم مخطط تغير معامل الأداء تبعاً لتغير درجة الحرارة في المولد بعد أن تم تحديد درجة التكاثف والتبخر.


Article
Modeling and Simulation of an Absorption Solar Cooling System Under Iraqi Weather Conditions

Author: H.A. Hussein
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2017 Volume: 35 Issue: 4 Part (A) Engineering Pages: 356-364
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

This work aims to model and simulate an absorption cooling system using solar flat- plate receiver with water lithium bromide (li.Br-H2O) mixture as a working fluid, and to select the optimum type for absorption cooling system, which have suitable application in Iraq. Weather conditions for Erbil city have been selected. Coefficient of performance (COP) for a single, double (series and parallel), half and triple effect of an absorption cooling system are calculated and optimized. COP Prediction, hot water temperature, and the rate of heat transfer have been simulated and represented by using TRNSYS and EES programs. Active area of the solar flat-plate receiver is calculated and optimized for five suggested areas of (140, 150, 160, 170, and 180 m 2). Average heating load, average daily - radiation and cooling load for summer months (June, July, August, and September) have been calculated. The results indicated that, the superior type of the four absorption-cooling systems is a single effect, which has COP 80% at generator temperature of (81 °C). Also the results indicated that the optimum area of solar flat-plate receiver was 160 m2 which has achieved the maximum capacity of cooling power and consumed capacity in the generator (50, and 62.5) kW respectively. I think, according to the previous studies , the current work is the first in Iraq because it approved that, single effect type is an efficient and more relevant type for good working under Iraqi climate by using solar flat–plate receiver and suitable to apply it experimentally in a wide range.


Article
Acetone - Zinc Bromide as Working Fluids in Solar Absorption Cooling System

Authors: Nabeel A. Ghyadh --- Salman H. Hammadi --- Haroun A. K. Shahad
Journal: Basrah Journal for Engineering Science مجلة البصرة للعلوم الهندسية ISSN: Print: 18146120; Online: 23118385 Year: 2020 Volume: 20 Issue: 1 Pages: 23-29
Publisher: Basrah University جامعة البصرة

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Abstract

In the present research, experimental and theoretical work is carried out using ecofriendly refrigeration as working fluid in the absorption system. The working pair is considered in the analysis, namely, acetone and zinc bromide. The system is designed to work under outdoor conditions in Hila city-Iraq. In the test, the outdoor conditions are varied and the hot water is used as heat source. To check the performance of the system, various operating conditions are included in this study. These varied conditions include heat source, absorber, condenser, and evaporator temperatures. The system is tested during September 2019. The results show that the COP of the absorption cooling system ranged from 0.13 to 0.487, while the temperature drop in evaporator is 16 °C. Condensation and absorption temperatures are under 41 °C, while the maximum temperature of the driving water is 80 °C. The steady-state model is analyzed by using EES program. Energy and mass balance achieved on absorption system to predict some parameters such as temperature, pressure and (COP) to compare it with the measured parameters. The results of the model satisfied the experimental results for temperatures as well as the coefficient of performance. The results also show that the generator temperature had a great effect on the system performance.

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