Abstract
Light-emitting diode (LED) lighting should be considered for lighting efficiency enhancement, however, waste heat from light-emitting diode (LED) lighting increases the internal cooling load during the summer season. In order to solve this problem we propose a thermal management system for light-emitting diode (LED) lighting with a heat exchanger module integrated with the building’s heating, ventilation, and air conditioning (HVAC) system to move the lighting’s waste heat outdoors. An experiment was carried out to investigate the thermal effects in a test chamber and the heat exchange rate between the heat sink and the duct air. The heat generated by the light-emitting diode (LED) lighting was calculated as 78.1% of light-emitting diode (LED) input power and the heat exchange rate of the lighting heat exchange module was estimated to be between 86.5% and 98.1% according to the light-emitting diode (LED) input power and the flow rate of air passing the heat sink. As a result, the average light-emitting diode (LED) lighting heat contribution rate for internal heat gain was determined as 0.05; this value was used to calculate the heating and cooling energy demand of the office building through an energy simulation program. In the simulation results, the cooling energy demand was reduced by 19.2% compared with the case of conventionally installed light-emitting diode (LED) lighting.
Highlights
Light-emitting diodes (LEDs) have become widely available in various industrial fields concerned with energy saving and offer positive environmental effects due to their advantages over conventional light sources, such as low power consumption, long lifetime, rapid response time, compact physical size, and physical robustness [1,2,3]
Because the ambient temperature was not constant, the baseline test was carried out three times at the same conditions, and the lighting heat exchange module (LHEM) test was carried out three times at 60, 180 and 300 cubic meters per hour (CMH) in terms of air flow rate
In order to prevent this adverse effect on cooling energy demand in buildings, we proposed a thermal management system for LED lighting integrated with a heat exchange module and HVAC ductwork to move lighting heat outdoors, and carried out a systematic experiment to investigate the heat exchange rate of the module and the cooling effect in a test chamber
Summary
Light-emitting diodes (LEDs) have become widely available in various industrial fields concerned with energy saving and offer positive environmental effects due to their advantages over conventional light sources, such as low power consumption, long lifetime, rapid response time, compact physical size, and physical robustness [1,2,3]. Thermal management systems for enhancing the efficiency of LED lighting should be considered from the chip level to the system level, involving optimum chip design with a patterned sapphire substrate, structures for a direct thermal path to the heat sink, and a cooling method with a fan or thermoelectric cooler to dissipate heat to the surroundings [9,10,11,12,13] Among these aspects, the associated heat sink must be considered and optimized for reliable cooling performance in high-power LED lighting. The natural-convection type is preferred on account of needing no additional fans or electric consumption, even though natural-convection heat sinks are thermally less effective, being less compact and heavier than forced-convection types, and require careful design to achieve the required thermal performance [14,15,16,17]
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