Abstract
Daylight performance metrics provide a promising approach for the design and optimization of lighting strategies in buildings and their management. Smart controls for electric lighting can reduce power consumption and promote visual comfort using different control strategies, based on affordable technologies and low building impact. The aim of this research is to assess the energy efficiency of these smart controls by means of dynamic daylight performance metrics, to determine suitable solutions based on the geometry of the architecture and the weather conditions. The analysis considers different room dimensions, with variable window size and two mean surface reflectance values. DaySim 3.1 lighting software provides the simulations for the study, determining the necessary quantification of dynamic metrics to evaluate the usefulness of the proposed smart controls and their impact on energy efficiency. The validation of dynamic metrics is carried out by monitoring a mesh of illuminance-meters in test cells throughout one year. The results showed that, for most rooms more than 3.00 m deep, smart controls achieve worthwhile energy savings and a low payback period, regardless of weather conditions and for worst-case situations. It is also concluded that dimming systems provide a higher net present value and allow the use of smaller window size than other control solutions.
Highlights
Suitable use of daylight is essential in reducing the power consumption of electric lighting [4], while the development of new technologies, such as the improvement of LED lamps or lighting smart controls, can help promote a lower impact on the environment [5]
Lighting smart controls were used in other buildings of note [7,8] with a noticeable energy saving in lighting
This research aims to assess the energy efficiency and economic profitability of lighting smart controls, determining suitable solutions according to the geometry of the architecture and the weather conditions, mainly based on the use of affordable technologies and with the lowest possible implementation cost, and with a special focus on retrofitting office buildings
Summary
Suitable use of daylight is essential in reducing the power consumption of electric lighting [4], while the development of new technologies, such as the improvement of LED lamps or lighting smart controls, can help promote a lower impact on the environment [5]. Lighting smart controls were introduced in the early 2000s to promote energy saving in buildings. One of the first outstanding examples of their use in buildings is the New York Times Headquarters, where a lighting dimming system based on occupancy and daylight availability achieved an energy saving of close to 40% in the floor perimeters [6]. Lighting smart controls were used in other buildings of note [7,8] with a noticeable energy saving in lighting
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