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Performance Deterioration Analysis of Direct Solar Hot Water System in Scaling Environment

Arunachala, U C and Bhatt, Siddhartha M and Sreepathi, L K (2010) Performance Deterioration Analysis of Direct Solar Hot Water System in Scaling Environment. In: Proceedings of International Conference on Recent Advances in Mechanical Engg. (ICRAME2010), 8-9, April 2010, Noorul Islam University, Kumaracoil, Tamilnadu, India..

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Abstract

Scale formation in risers of direct solar hot water systems are a problem in places where hard water is being used. In this paper, the effects of scaling on energy efficiency indices like instantaneous efficiency, mass flow rate and overall heat loss coefficient are quantified by the Hottel Whillier Bliss (H-W-B) equation in case of both thermosiphon and forced circulation systems. The effects of scaling on mass flow and heat transfer rates for both systems are quantified. It is seen in thermosiphon system that the mass flow rate altered by scaling affects energy efficiency much more than that altered by heat transfer rate. The scaling effect is more predominate in thermosyphon systems than in forced circulation systems. The analytical study reveals the drop in instantaneous efficiency as 39.5% in thermosiphon system and 7.0 % in case of forced circulation system for the scale thickness of 3.75 mm. Experiments are conducted for validation. To study the nature of scale growth, scale mapping is done for the entire water system. Scale prediction methodology is brought out based on the field visits.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: H-W-B equation, scaling, hardness, thermosiphon systems, forced circulation systems,
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 19 Oct 2011 09:49
Last Modified: 19 Oct 2011 09:49
URI: http://eprints.manipal.edu/id/eprint/1425

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