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Title: Flow Design and Collector Performance of a Natural Circulation Solar Water Heater
Authors: Bukola O. Bolaji
Keywords: Solar water heater,
fluid flow.
natural circulation
solar collector
Issue Date: 2006
Publisher: Journal of Engineering and Applied Sciences
Citation: Solar water heater, natural circulation, solar collector, fluid flow.
Series/Report no.: 1 (1): 7-13,;2006
Abstract: This paper presents the design and experimental analysis of flow inside the collector of a natural circulation solar water heater. The water heater was constructed and tested at Ado-Ekiti, Nigeria on Latitude 7.5oN. The results show that the system performance depends very much on both the flow rate through the collector and the incident solar radiation. A typical day analysis of the system shows that collector efficiency is high especially around mid-day when the solar collector receives the highest energy. During the test, the results showed that the system exhibited optimum flow rate of 0.1 kg/s.m2 at a maximum collector efficiency of 68.5%. Also, the average daily efficiency of the system was 57.7% and the maximum water temperature obtained was 83.5oC, while the maximum ambient temperature obtained was 34.5oC.
Description: Heating of water for domestic purposes is a simple and effective way of utilizing solar energy. A solar collector intercepts the incident solar radiation, converts it into heat, and finally transfers this heat to a working fluid for an end use system. The natural or free circulation solar water heating systems are most applicable in smaller installations. These are natural choice for domestic solar hot water systems. The circulation of water between the solar collectors and the heat store is by gravity or thermosyphon action, whereas in the forced convection system, an electric pump is used for the water circulation which adds to the cost, energy consumption and complexity of the system.
URI: http://repository.fuoye.edu.ng/handle/123456789/2322
Appears in Collections:Mechanical Journal Publications

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