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Effect of Scaling on Energy efficiency of Solar flat plate water heaters

Bhatt, M Siddhartha and Sreepathi, L K and Arunachala, U C (2009) Effect of Scaling on Energy efficiency of Solar flat plate water heaters. SESI JOURNAL, 19 (1-2). ISSN 1945-9203

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Abstract

Component malfunctioning and system performance degradation in solar water heaters due to scaling are common in areas where hard water is used. Scaling effects on energy efficiency indicators like pressure drop, overall heat loss coefficient, instantaneous efficiency and annual efficiency are quantified by the Hottel Whillier Bliss (H-W-B) equation in case of thermosiphon and forced circulation systems. The effects of mass flow and heat transfer rate for both the thermosiphon and forced circulation systems are quantified. It is seen that scaling altered mass flow rate affects energy efficiency much more than scaling altered heat transfer rate. However, the effect due to scaling is more prevailing in case of thermosiphon system. The effect of scaling has been simulated through the perceived uniform reduction in the flow area of the risers.

Item Type: Article
Uncontrolled Keywords: solar water heater, thermosiphon collectors, forced circulation collectors, H-W-B equation, scaling, hardness, annual energy efficiency.
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 19 Oct 2011 09:43
Last Modified: 19 Oct 2011 09:43
URI: http://eprints.manipal.edu/id/eprint/1413

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