Smart LED lighting system with occupants’ preference and daylight harvesting in office buildings

Abstract

ABSTRACT Artificial lighting contributes an impactful quantity of total energy consumption and needs to be reduced especially in zero energy buildings (ZEB). Daylight harvesting holds a great potential to maximize the energy-saving in buildings, whereas it may disturb the occupants’ visual preference if not regulated properly. With the advancements in sensing and communication technology, many energy-efficient lighting systems are proposed for office buildings but they lack in addressing occupants’ visual preferences. Therefore, a low voltage DC (LVDC) powered smart LED lighting system with daylight harvesting and occupants’ visual preference is proposed. The proposed system enhances energy saving by controlling the daylight harvesting and other lighting parameters in the office building, keeping users’ visual preference on priority. Experimental results show that with the proposed system, an energy saving of 26.11% has been reported when compared with the conventional setup of equal illumination over a period of 30 days. Energy-saving of 61–69% is reported by utilizing the proposed system in clear sky conditions when compared to the existing lighting setup. However, in cloudy conditions, the proposed system preserves 42–55% energy concerning the existing system in the office building. In the end, economic-analysis is explored to analyze the cost-saving along with environmental benefits.