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Article
Performance Study of Solar Air Heater with Thermally Conducted Multi V Shaped Baffles and Ribs

Authors: Jalal M. Jalil --- Ghaydaa K. Salih --- Yosif A. Madhi
Journal: Engineering and Technology Journal مجلة الهندسة والتكنولوجيا ISSN: 16816900 24120758 Year: 2018 Volume: 36 Issue: 8 Part (A) Engineering Pages: 930-938
Publisher: University of Technology الجامعة التكنولوجية

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Abstract

In this study, solar air heater with thermally conducted multi V shaped baffles and with same baffles and ribs are investigated experimentally and numerically to improve the performance of conventional air heaters. Numerically, steady state 3D forced convection turbulent model is used to solve Navier Stokes and energy equations of airflow inside rectangular duct of solar air heater. The code was validated by comparing the numerical result with experimental results and the agreement seems acceptable. The numerical studies were extended to study the cases of flat plate and straight baffles solar air heater. From experimental and numerical studies, it was found that the collector with V shaped baffles and ribs has the highest efficiency. The results showed that the V shaped baffles and ribs solar air heater is 14% more efficient compared to flat plate collectors.


Article
INVESTIGATION OF THE EFFECT OF DUCT HEIGHT ON THE PERFORMANCE OF SOLAR AIR HEATER WITH BAFFLES

Authors: Jalal Mohammed Jalil --- Ghaidaa Kaain Salih --- Yousif Ali Madhi
Journal: Journal of Engineering and Sustainable Development مجلة الهندسة والتنمية المستدامة ISSN: 25200917 Year: 2018 Volume: 22 Issue: 2 (Part-2) Pages: 111-122
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

In this study, solar air heater with straight shaped baffles is investigated numerically and experimentally to improve the thermohydraulic performance by changing the height of the duct to find the optimum value. Numerically, steady state 3D forced convection turbulent model is used to solve Navier Stokes and energy equations of airflow inside rectangular duct of solar air heater. The results showed that, the 3.75 cm duct height with air mass flow rate of 0.05 kg/s yields the highest effective efficiency. In addition, the results showed that the 2.5 cm duct height gives the highest effective efficiency for mass flow rate up to 0.0375 kg/s and it decreases as mass flow rate increases due to excessive differential pressure developed across the duct.

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