Paper Conference

Proceedings of BauSim Conference 2014: 5th Conference of IBPSA-Germany and Austria


Estimation of electrical lighting energy use in buildings: a method comparison

C. Calistru, U. Pont, A. Mahdavi

Abstract: To satisfy the requirements of users in buildings, the visual environment needs to meet certain conditions. Specifically, adequate illuminance levels must be maintained dependent on the rooms' function and usage. Toward this end, electrical lighting must be deployed in many instances. However, the use of electrical lighting and the associated electrical energy use can be reduced by appropriate utilization of daylight. To estimate, in a convenient manner, the electrical energy use for lighting in buildings, there exist a number of simplified procedures. An example of such a procedure involves the use of the indicator LENI (Lighting Energy Numeric Indicator). Using such indicators, area-related electrical energy use can be calculated on a room by room basis. However, such procedures involve a significant number of simplifications with regard to building geometry, properties of relevant building components (e.g., windows, shading), climatic context, and use patterns. In this context, the present paper explores the reliability of such procedures as compared to the results that can obtained using more detailed (simulation) methods. Toward this end, we compare for a sample of rooms (e.g., lecture room, office space) the results obtained by simplified and detailed methods in view of electrical energy demand for lighting in buildings. The research results are expected to further define the degree to which simplified calculation results could deviate from more detailed estimations of daylight availability in architectural spaces the corresponding implications for electrical lighting usage.
Pages: 484 - 489