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Article
Performance of Solar Module withPresence of Two Types of Reflectors in Concentrator System

Authors: Fadhil Mahmood Oleiwi --- Ahmed F. Atwan --- Naseer K.Kasim
Journal: IRAQI JOURNAL OF COMPUTERS,COMMUNICATION AND CONTROL & SYSTEMS ENGINEERING المجلة العراقية لهندسة الحاسبات والاتصالات والسيطرة والنظم ISSN: 18119212 Year: 2019 Volume: 19 Issue: 2 Pages: 50-57
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

Any work to improve the performance of the solar modules could add to theireconomic competitiveness against fossil fuels. In the present work the performance of PVsolar module was improved by using V-Trough concentrator system (CPV) which movedby two axis tracking system. The concentrator consists of two flat reflectors of area 2 m2for each one with geometric concentration ratio of 2X. To optimize the performance of theV-Trough CPV systems, two types of reflector material, Aluminum and mirror (glass coatedby silver nitrate) were used. The results indicated that the temperature of PV referencemodule was higher than the ambient temperature by 27oC but there is too small differencein temperature between the tracking PV module with the reference which ranged to 2oC,while the temperature of the CPV system was higher than reference by 37oC. Thetemperature of the PV module under mirror reflectors was lower than module combinedwith Aluminum reflectors by 3oC. As a result of arising of the temperature of CPV systemin compare with PV reference module, the open circuit voltage was droop by 0.7 V, 0.5 Vfor PV module under mirror and Aluminum reflectors respectively. The reflectorsincreased the short circuit current values by 2.1 A, 2.6 A for PV module combined withmirror and Aluminum reflectors respectively. Accordingly the performance (as an averagedaily gain of output power) of the PV solar module was improved by using V-Trough CPVsystem, 44%, 34% by using Aluminum and mirror reflectors respectively.


Article
Design of Shell and Tube Heat Exchanger for Air Conditioning-Water Heating Hybrid System

Authors: Mohammed Jawad Yaseen --- Ahmed F. Atwan --- Alaa H. Shneishil
Journal: Journal of Education for Pure Science مجلة التربية للعلوم الصرفة ISSN: 20736592 Year: 2017 Volume: 7 Issue: 4 Pages: 1-15
Publisher: Thi-Qar University جامعة ذي قار

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Abstract

AbstractThe use of air conditioning-water heating hybrid system for heating, cooling and hot water ofbuildings, has significantly importance for energy saving. It has been proposed a system to recoverthe waste heat of refrigerant after leaving the air conditioning system condenser in the heating modeand the waste heat of refrigerant after leaving the air conditioning system compressor in the coolingmode to heat water for domestics or other needs. Shell and tube heat exchanger has been designed asa refrigerant-to-water heat exchanger located between the condenser and the expansion valve in theheating mode and between the compressor and the condenser in the cooling mode. The simulationprogram of heat exchanger has been built by using (MATLAP) in order to determining the heattransfer parameters and the temperature difference between the inlet cold water and outlet hot water,the results show that the effectiveness decrease with increase of water mass flow rate, while increasewith increase of tube length. As the tube length (15) m, the outlet hot water temperature from heatexchanger is (60.94) °C, for water mass flow rate (0.15) kg/s, and this value decrease exponentiallyand reach to about (7.528) °C, for water mass flow rate (2) kg/s, while for tube length (5) m, thesevalues ranging between (43.92) °C, to (1.234) °C, respectively.

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