Heat transfer characteristics of building walls using phase change material

1st International Symposium on Green Technology for Value Chains 2016

工业技术;生态环境科学

Irsyad, M.^1,2 ; Pasek, A.D.^2 ; Indartono, Y.S.^2 ; Pratomo, A.W.^2

Mechanical Engineering Department, Engineering Faculty, University of Lampung, Indonesia^1

Faculty of Mechanical and Aerospace Engineering, Institut Teknologi Bandung, Indonesia^2

关键词: Heat transfer characteristics;    Measured parameters;    Minimizing energy;    Phase change process;    Surface temperatures;    Temperature differences;    Thermal conductivity tests;    Through the wall;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/60/1/012028/pdf
DOI  :  10.1088/1755-1315/60/1/012028

来源: IOP

【 摘 要 】

Minimizing energy consumption in air conditioning system can be done with reducing the cooling load in a room. Heat from solar radiation which passes through the wall increases the cooling load. Utilization of phase change material on walls is expected to decrease the heat rate by storing energy when the phase change process takes place. The stored energy is released when the ambient temperature is low. Temperature differences at noon and evening can be utilized as discharging and charging cycles. This study examines the characteristics of heat transfer in walls using phase change material (PCM) in the form of encapsulation and using the sleeve as well. Heat transfer of bricks containing encapsulated PCM, tested the storage and released the heat on the walls of the building models were evaluated in this study. Experiments of heat transfer on brick consist of time that is needed for heat transfer and thermal conductivity test as well. Experiments were conducted on a wall coated by PCM which was exposed on a day and night cycle to analyze the heat storage and heat release. PCM used in these experiments was coconut oil. The measured parameter is the temperature at some points in the brick, walls and ambient temperature as well. The results showed that the use of encapsulation on an empty brick can increase the time for thermal heat transfer. Thermal conductivity values of a brick containing encapsulated PCM was lower than hollow bricks, where each value was 1.3 W/m.K and 1.6 W/m.K. While the process of heat absorption takes place from 7:00 am to 06:00 pm, and the release of heat runs from 10:00 pm to 7:00 am. The use of this PCM layer can reduce the surface temperature of the walls of an average of 2°C and slows the heat into the room.