Optimization of the heat exchanger in a flat plate indirect heating integrated collector storage solar water heating system

Article


AL-Khaffajy, Marwaan and Mossad, Ruth. 2013. "Optimization of the heat exchanger in a flat plate indirect heating integrated collector storage solar water heating system." Renewable Energy. 57, pp. 413-421. https://doi.org/10.1016/j.renene.2012.11.033
Article Title

Optimization of the heat exchanger in a flat plate indirect heating integrated collector storage solar water heating system

ERA Journal ID4067
Article CategoryArticle
AuthorsAL-Khaffajy, Marwaan (Author) and Mossad, Ruth (Author)
Journal TitleRenewable Energy
Journal Citation57, pp. 413-421
Number of Pages9
Year2013
PublisherElsevier
Place of PublicationUnited Kingdom
ISSN0960-1481
1879-0682
Digital Object Identifier (DOI)https://doi.org/10.1016/j.renene.2012.11.033
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0960148112007689
Abstract

Due to the environmental impact of energy usage, consumers need to be encouraged to use renewable energy sources such as solar energy. The indirect heating flat plate integrated collector storage solar water heating system is one of the compact systems for domestic water heating. It incorporates the collection of a solar energy component and a hot water storage component in one unit. The objectives of this study were to investigate the effect of different parameters on the thermal performance of this system with the aim of reducing both the initial and the running costs. The outlet service water temperature was used as a measure of performance, because it is an indicator of the energy acquired from the solar radiation. The continuity, momentum and energy equations of the fluids involved in the system were numerically solved in a steady state condition, using FLUENT software. Three-D CFD models were developed and validated using previous experimental results. A standard k-ω turbulent model was used in the optimization of the heat exchanger because it produced good agreement with the experimental results. The surface-to-surface radiation model was included. The effect of single and double row heat exchangers with different lengths was investigated. Circular and elliptic cross-section pipes were also examined. Mass flow rates of 500 and 650 L/h were chosen. The effect of the angel of collector was also examined. The results showed that the single row HX of 10.8 m length for both the elliptical and type B tube gave high service water outlet temperature (acceptable for heat exchanger design) and with low pumping power. This resulted in an increase in the thermal efficiency and a significant reduction in both the initial and the operating costs of the system.

Keywordssolar water heaters; renewable energy; computational fluid dynamics
ANZSRC Field of Research 2020401703. Energy generation, conversion and storage (excl. chemical and electrical)
401706. Numerical modelling and mechanical characterisation
401204. Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics)
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author.

Byline AffiliationsFaculty of Engineering and Surveying
Department of Mechanical and Mechatronic Engineering
Institution of OriginUniversity of Southern Queensland
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