Research Papers

Financial Viability of Energy Conservation Using Natural Light in an Academic Building in Temperate Zone

[+] Author and Article Information
Pooja Sharma

Centre for Energy Studies,
Indian Institute of Technology Delhi,
Delhi 110016, India

Dibakar Rakshit

Centre for Energy Studies,
Indian Institute of Technology Delhi,
Delhi 110016, India
e-mail: dibakar@iitd.ac.in

1Corresponding author.

Manuscript received February 16, 2016; final manuscript received October 3, 2016; published online November 2, 2016. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 138(6), 061015 (Nov 02, 2016) (10 pages) Paper No: SOL-16-1079; doi: 10.1115/1.4034926 History: Received February 16, 2016; Revised October 03, 2016

The environment of a regularly occupied space can be extensively improved by maximum utilization of natural light/daylight, which is available in abundance. In Indian climate, availability of sufficient day light in both direct and diffused form of radiation can lead to reduction in dependency on artificial lighting thus, decreasing energy demand for artificial lighting system. In this study, an institutional building in New Delhi, India is analyzed for its daylighting characteristics. The academic block of a building comprising all categories of regularly spaces is modeled and simulated using Integrated environmental solutions - virtual environment (IES VE). The objective is to analyze the extent of penetration of natural light into these spaces of the building for reducing energy requirement for artificial lighting by studying a room, which performs the worst as per present case parameters. The conclusion puts forth the optimal solutions for utilizing maximum day light in a work space, complying with standards set forth by building construction council by utilizing the principles for increasing luminous flux level through visual light transmittance, window-to-wall ratio, and controlled usage of artificial lighting. Considering all these factors in the analysis, energy savings and carbon mitigation due to these savings in regularly occupied spaces are finally evaluated.

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Fig. 1

Floor plans and building isometric view

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Fig. 2

Daylight illuminance levels inside the room at 18% WWR with varying VLT

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Fig. 3

Daylight illuminance levels inside the room at 45% VLT with varying WWR

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Fig. 4

Movement of sun in northern hemisphere [13]

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Fig. 5

Monthly average global horizontal radiation for New Delhi. Data source: ISHRAE 421820 WMO.

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Fig. 6

Percentage window area on each façade in present orientation

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Fig. 7

Percentage window area on each façade after directional optimization

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Fig. 8

Variation in average illumination with increase in VLT for worst case at 18% WWR for equinox condition

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Fig. 9

Comparison of variation in average illumination with increase in VLT for worst case at 18% WWR for equinox condition, winter solstice, and summer solstice

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Fig. 10

Variation in average illumination with increase in WWR of worst case at 45% VLT

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Fig. 11

Comparative analysis of proposed feasible solutions in terms of percentage area above threshold

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Fig. 12

Cost analysis of increasing WWR and VLT (considered for regularly occupied spaces of entire building)

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Fig. 14

Availability of direct normal radiation versus diffuse radiation data source: ISHRAE 421820 WMO

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Fig. 13

Cost comparison of proposed feasible solutions



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