Effect of LED lighting on the cooling and heating loads in office buildings

• Published in: Applied energy Vol. 113; pp. 1484 - 1489
• Main Authors: Ahn, Byung-Lip, Jang, Cheol-Yong, Leigh, Seung-Bok, Yoo, Seunghwan, Jeong, Hakgeun
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.01.2014; Elsevier
• Subjects: Air conditioning systems; Air conditioning. Ventilation; Applied sciences; Building technical equipments; Buildings; Buildings. Public works; Convective heat; Energy; Energy consumption; Energy management and energy conservation in building; Energy. Thermal use of fuels; Environmental engineering; Exact sciences and technology; Fluorescent lighting; Green Building; Heating, air conditioning and ventilation; LED lighting; Lighting; Rational use of energy: conservation and recovery of energy; USA; Korea, Rep; LED lighting; Energy consumption; Convective heat; Fluorescent lighting; Green Building
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2013.08.050

•Application of heat control strategy reduces total energy consumption of LED lighting.•Convective heat from LED lighting should be emitted outdoors during cooling period.•Seasonal optimization of convective heat lowers total energy consumption. LED lighting has the potential to provide energy savings, and in many countries, there are policies to encourage its use owing to its higher efficiency and longer life in comparison to other lighting fixtures. However, since 75–85% of the light electric power in LED lights is still generated as heat, the sole use of LED lighting in a building could have a negative effect on the cooling load. In this paper, we study the heating properties of LED lighting and establish a management strategy to exploit these properties to reduce the energy used for heating and cooling of buildings. Using a simulation program, the energy consumption of the Green Building in Daejeon, Korea, and the virtual building provided by the U.S. Department of Energy (DOE) was computed according for different light fixtures. A control strategy is more applicable to LED lighting than to general fluorescent lighting, especially for the cooling of a building, because the use of a return-air duct and the heat sinks on the LED fixtures allow the heat to be better directed. Deployment of LED lights in combination with such a control strategy can help to increase the energy efficiency of a building.