Traditionally, white LED's are made by mixing phosphor with an epoxy resin. But, the phosphor is not always evenly distributed, and the epoxy resin has a low thermal conductivity resulting in accelerated thermal aging during operation. This article studies the effects of implementing a ceramic phosphor plate with varying concentrations of magnesium oxide, and silicon dioxide. It was found that as the magnesium oxide concentration increased so did the thermal ...
Author(s): Byung Woo Jeong, Dae-Ho Yoon, Eun-Kyung Ji, Mong Kwon Jung, Sang Hwan Bak, Young-Hyun Song
Thermoelectric (TE) generators have very important applications, such as emerging automotive waste heat recovery and cooling applications. This study investigates how thermal conductivity, seebeck coefficient, and resistivity of bismuth telluride changes with increasing isothermal aging. The thermal conductivity was tested with the Transient Plane Source (TPS) method. Both bismuth telluride n and p type were tested for 2 wk, 8 wk, 6 mo, 1 yr, and 2 yr of isothermal aging at 240 degrees Celsius. The ...
Author(s): Josh Whaley, Karla R. Reyes-Gil, Nancy Yang, Ryan Nishimoto
This study investigates the properties of a material to be used as an energy storage medium that can use energy stored from the summer months, and then release it during the winter. The proposed material uses a graphite foam, with ZnO coatings with a flower like morphology, to house a sugar alcohol phase change material (PCM). The thermal conductivity of the material was measured using a transient plane source (TPS) ...
Author(s): Adrian Mihail Motoc, Alain Celzard, Elena Palomo del Barrio, Ioan Albert Tudor, Mirela Petriceanu, Prasanta Jana, Radu Robert Piticescu, Vanessa Fierro, Viorel Badilita
This article investigates the effect of aluminum doping on the thermal conductivity and other thermoelectric properties of nanostructured Zn1•XAlXTe (0 ≤ X ≤ 0.15) for a temperature range of 300 K – 600 K. The thermal conductivity was measured using the transient plane source (TPS) technique by a thermal constants analyzer. It was found that with increasing doping of aluminum, the thermal conductivity decreased, and with increasing temperature thermal conductivity also decreased. The decreasing of thermal ...
Author(s): Ankam Bhaskar, Chia-Jyi Liu, Ching-Lin Chang, Wei-Ming Wu, Yi-Hsuan Pai
This study is to determine the thermal properties of a paraffin/red brick composite to determine its viability as a form-stable phase change material. Extended graphite was also added to the composite to improve its thermal conductivity. The thermal conductivity for this material was measured using a transient plane source (TPS) method. By adding the paraffin, the thermal conductivity of the composite increase, also by adding extended graphite the thermal ...
Author(s): Dihia Djefel, Gilles Lefebvre, Laurent Royon, Said Makhlouf, Souad Khedache
