| Keywords |
Phase change material; Light; Transient heat analysis; Energy simulation |
| Abstract |
The phase chase material (PCM) integrated lighting fixture is suggested to reduce the heat from lightings in the building by inserting PCM in a cover of lighting. Thereby, the heat from the lightings expects to be absorbed to the PCM during the working time and rejected during the night time without occupants. The thermal performance of PCM integrated lighting fixture has been estimated using Physibel Voltra which provides three-dimensional transient heat transfer analysis. The results shows that it can successfully decrease the surface temperature of lighting about 2°C and reduce the heating load within averaged 47%. Based on the analyzed results, the detail energy simulation has been performed using theoretical equations and empirical models from the Energyplus to evaluate the energy saving potential of PCM-integrated lighting fixture during the cooling season. The target building is normal office building with the variable air volume (VAV) system for air conditioning and ventilation. As results, the 5.8% of energy savings is expected from the chiller, pump and fan by using PCM-integrated lighting fixture. In addition, it can be expected that if the heating loads from lightings could be more decreased up to 10% by improving heat transfers of PCM layers, the energy consumption could be saved maximum 13.2% during the cooling season. |