A master thesis from Aalborg University
Estimation Methodology for the Electricity Usage of Daylight and Occupancy Controlled Artificial Lighting
Author(s)
Term
4. term
Publication year
2015
Submitted on
2015-06-08
Pages
345 pages
Abstract
This report is the product of the completion of the two year master programme in Master of Science, with concentration in Indoor Environmental and Energy Engineering, at Aalborg University, Department of Civil Engineering. Buildings accounts for about 40 % of the energy usage in the word today, and artificial lighting stands for about 15-30 % of the total electricity usage in buildings in Scandinavia. This shows that there is potential for reducing the electricity usage of buildings with more efficient artificial lighting. Prior to obtaining more efficient artificial lighting, the electricity usage for artificial lighting should be accurately determined. The existing estimation methodology for calculating the electricity usage of daylight and occupancy controlled artificial lighting in Norway is based on a very rough estimate. The objective of this thesis is to develop a new estimation methodology which is both rapid and accurate. In order to obtain the estimation methodology of daylight and occupancy controlled artificial lighting, occupancy profiles and the interior illuminance due to external sky conditions must be established. The occupancy profiles were retrieved from gathered data of the occupant time in an office building. The interior illuminance was determined with measurements and simulation. The exterior sky conditions were established with pictures, solar irradiance measurements and simulation. Two estimation methodologies are established; the CIE Sky Method and the Hourly Average Method. The calculated electricity usage by the methodologies were validated with measurements of the electricity usage. The Hourly Average Method proved to be the most rapid and accurate methodology.
Keywords
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