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research-article

Performance prediction and assessment of energy conservation potential for a light pipe system in Indian composite climate of New Delhi

[+] Author and Article Information
Kalameshwar Patil

SDM College of Engg. & Tech. Dharwad, Centre for energy studies, IIT Delhi, Hawzkhas, New Delhi, 110016, India
kalmeshnp@gmail.com

Kaushik S.C.

SDM College of Engg. & Tech. Dharwad, Centre for energy studies, IIT Delhi, Hawzkhas, New Delhi, 110016, India
kaushik@ces.iitd.ac.in

Sat Narayan Garg

SDM College of Engg. & Tech. Dharwad, Centre for energy studies, IIT Delhi, Hawzkhas, New Delhi, 110016, India
sngarg@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4039656 History: Received April 26, 2017; Revised February 12, 2018

Abstract

Light pipes are popularly used for transporting outdoor sunlight into deep spaces of the building and hence use of artificial lighting could be substantially reduced. Performance prediction of a light pipe is an essential step before its use in buildings, so that energy saving potential of the light pipe could be quantified. This paper deals with experimental validation of three existing semi empirical models for light pipes, with different aspect ratios, installed on a windowless test room, at IIT Delhi, New Delhi. Two new semi empirical models, based on the existing correlations are developed. The better performing new model is used for the prediction of internal illuminance, energy saving potential and CO2 mitigation potential of light pipe system for the test room. New model found to perform better with mean bias error and root mean squared error of 0.076 and 0.01 respectively. Monthly average energy saving potentials of the light pipe - fluorescent tube light system are found to be 50 % for continuous dimming control, 38% for three step on-off control. Results show that the light pipe-fluorescent tube light system, with different lighting controls, could reduce CO2 emissions to 15-50%.

Copyright (c) 2018 by ASME
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