Combined lighting system energy efficiency evaluation by the light flux regulation

Abstract

The greatest energy-saving effect in lighting systems can be achieved by the reduction of the operation time of the artificial light sources using natural light. As such a source, one can use modern light transmitting system — solar light guide, which allows sunlight to be delivers deliver to any spot of the room, regardless of the number of storeys, and also provides a uniform natural light. The important factors that affect the efficiency of the use of the solar light guide are light and climatic characteristics of the region. The estimation of energy efficiency of the solar light guide application in conjunction with LED lamps provide illumination at insufficient lighting from the solar light guide in the morning — evening hours, during periods of cloud and depending on the time of the year is presented. The automatic control of the artificial light source light flux increases the energy efficiency of lighting system under consideration by 29.5% in the clouds and by 60.5% on a clear sunny day. The estimation of energy efficiency in the changes of the axis angle incline depending on the latitude of the region to use this lighting system (for example, Chelyabinsk) is shown. The highest efficiency can be achieved with the solar light guide axis incline at 20-25 degrees.