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Performance Deterioration of Thermosiphon Solar flat plate water heater due to Scaling

Arunachala, U C (2011) Performance Deterioration of Thermosiphon Solar flat plate water heater due to Scaling. In: International Conference on Mechanical, Automotive and Aerospace Engineering, May 17 – 19, 2011., Legend Hotel, Kuala Lumpur, Malaysia..

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Abstract

A Flat Plate Collector is a heat exchanger that transforms incident solar radiation into heat by accumulating it within the enclosure through green house effect. The total system with Collector, highly insulated water storage tank and well insulated pipes connecting the two is called as Flat plate Solar Water Heater. It is very popular due to their work simplicity, robust design and low maintenance cost. The performance of Flat plate Solar Water Heater deteriorates within five to twelve years of their installation due to factors related to manufacturing, operating conditions, lack of maintenance etc. Especially, problem due to scaling is significant as it is based on quality of water used. The remaining factors are system dependent and could be overcome by quality production. Software is developed by incorporating Hottel Whillier Bliss (H-W-B) equation to ascertain the effect of scaling on system efficiency in case of thermosiphon system. In case of clean thermosiphon system, the instantaneous efficiency calculated at 1000 W/m2 radiation is 72 % and it drops to 46 % for 3.7 mm scale thickness. The mass flow rate is reduced by 90 % for 3.7 mm scale thickness. Whereas, the average temperature drop of water in the tank is not critical due to considerable heat content in water under severe scaled condition. But practically in case of major scale growth, some of the risers are likely to get blocked completely which leads to negligible temperature rise in the tank.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Thermosiphon system; scaling; instantaneous efficiency; H-W-B equation;
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 08 Nov 2011 10:41
Last Modified: 16 Mar 2013 06:38
URI: http://eprints.manipal.edu/id/eprint/1439

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