Muhammad, Irsyad and Amrizal, Amrizal and Dyan, Susila HEAT TRANSFER CHARACTERISTICS OF COCONUT OIL AS PHASE CHANGE MATERIALS IN FREEZING PROCESS. International Journal on “Technical and Physical Problems of Engineering”.

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Abstract

The Phase Change Material (PCM) is one of the techniques used to reduce the cooling load of the room. This process is carried out by placing the material at night in the room, releasing heat into the cold air, thereby undergoing a phase change and freezing. Therefore, this research is carried out to determine the heat transfer characteristics of PCM from coconut oil through the surface of the container using two types of materials, namely HDPE plastic and aluminum alloy 1050. The heat transfer layer is located at the top of a cube-shaped container with a side length of 5 cm each and a top surface thickness layer of 1 mm. The results showed that a phase change starts when the PCM is in liquid form and near the surface of the heat transfer layer after releasing heat to the bottom, hence, the part with higher temperature is in the middle. The particles become stationary after the entire PCM has completed the phase change. Furthermore, the lowest and highest temperatures start from the area closest to the heat transfer layer and the bottom, respectively. The freezing process of coconut oil occurs at a temperature of 23-21°C and undergoes sub-cooling to a temperature of 21°C. An increase in flow rate speeds up the super cooling process, especially for PCM near the heat transfer surface with aluminum material. The cooling process in coconut oil PCM done adequately for air velocities of 2.4 and 3.2 m/s at a temperature of 16°C, with the best cooling and heat transfer rates of 0.22°C/min and 3.1 kW/(m2.kg). The use of aluminum as a layer between PCM and air increases the cooling rate compared to HDPE plastic.

Item Type:	Article
Subjects:	T Technology > TJ Mechanical engineering and machinery
Depositing User:	Amrizal Amrizal
Date Deposited:	22 Aug 2022 01:39
Last Modified:	22 Aug 2022 01:39
URI:	http://repository.lppm.unila.ac.id/id/eprint/44166

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