Heat transfer characteristics of coconut oil as phase change material to room cooling application

1st International Symposium on Green Technology for Value Chains 2016

工业技术;生态环境科学

Irsyad, M.^1 ; Harmen^1

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

关键词: Air temperature;    Air velocities;    Ambient air temperature;    Cooling applications;    Heat transfer characteristics;    Temperature differences;    Three models;    Tropical countries;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/60/1/012027/pdf
DOI  :  10.1088/1755-1315/60/1/012027

来源: IOP

【 摘 要 】

Thermal comfort in a room is one of human needs in the workplace and dwellings, so that the use of air conditioning system in tropical countries is inevitable. This equipment has an impact on the increase of energy consumption. One method of minimizing the energy use is by using the phase change material (PCM) as thermal energy storage. This material utilizes the temperature difference between day and night for the storage and release of thermal energy. PCM development on application as a material for air cooling inlet, partitioning and interior needs to be supported by the study of heat transfer characteristics when PCM absorbs heat from ambient temperature. This study was conducted to determine the heat transfer characteristics on coconut oil as a phase change material. There are three models of experiments performed in this research. Firstly, an experiment was conducted to analyze the time that was needed by material to phase change by varying the temperature. The second experiment analyzed the heat transfer characteristics of air to PCM naturally convection. The third experiment analyzed the forced convection heat transfer on the surface of the PCM container by varying the air velocity. The data of experimental showed that, increasing ambient air temperature resulted in shorter time for phase change. At temperatures of 30°C, the time for phase change of PCM with the thickness of 8 cm was 1700 min, and it was stable at temperatures of 27°C. Increasing air temperature accelerated the phase change in the material. While for the forced convection heat transfer, PCM could reduce the air temperature in the range of 30 to 35°C at about 1 to 2°C, with a velocity of 1-3 m/s.