Showing papers by "Pakharuddin Mohd. Samin published in 2020"
TL;DR: In this paper, a passive cooling method using copper foam matrix in the photovoltaic panel's phase change material with multi-walled carbon nanotubes additives was proposed to regulate the cell's temperature effectively.
55 citations
TL;DR: In this paper, the effects of different tilt angles on the melting characteristic of the PCM as a passive cooling material inside a rectangular container were examined at four different angles, namely, 0o, 30o, 60o, and 90o, by applying heat on one of the rectangular container's walls filled with PCM.
Abstract: This paper presents the experimental and the numerical investigations to examine the effects of different tilt angles on the melting characteristic of the PCM as a passive cooling material inside a rectangular container. The experimental and the numerical tests are performed at four different angles, namely, 0o, 30o, 60o, and 90o, by applying heat on one of the rectangular container's walls filled with PCM at a constant temperature of 373 K. The purpose of the numerical study is to assess the possibility of analyzing the PCM melting characteristics accurately using a simulation model in ANSYS Fluent. The experimental and numerical results show good agreement with the satisfactory error ratios ranging between 4% and 6%. The results also show that the decrease in the PCM container tilt angle leads to the increase in the time taken for the melting process of PCM to complete. This is due to the diminishing effects of the convection heat transfer as the tilt angle is reduced. In general, a shorter time taken for complete melting of the PCM indicating a better cooling performance. Therefore, in this paper we have concluded that the PCM's cooling performance can be improved by increasing the tilt angle closer to the vertical angle (90o).
22 citations
TL;DR: In this article, the authors proposed a hybrid cooling system that is more versatile in providing a flexible cooling mechanism with various design parameters to control the cooling performance for the battery pack, thus reducing the overall size of the cooling system by 16.3%.
Abstract: Demand for sustainable transport system is craving for hybrid and electric vehicles with high-power and high-energy electric storage system for increased range of haul. To support such high-power applications, the Li-Ion battery developers’ trends are to formulate batteries with high discharge rate and high ampere rate of up to 100 Ah. Those batteries would suffer from a drastic increase in heat generation rate, which could increase the temperature of the battery above 313 K (40 °C) under the conventional cooling system. Most of the research works proposed direct liquid cooling or liquid cooling plates to attain sufficient cooling for high ampere battery packs. In the present research, the focus is on a hybrid cooling system that is more versatile in providing a flexible cooling mechanism with various design parameters to control the cooling performance for the battery pack. Through computational fluid dynamics simulations, it is understood that it needs 9 mm thickness for pure phase change material (PCM) cooling system to control the temperature within 313 K (40 °C) for the battery with heat generation rate of 30,046 W/m3. The proposed hybrid cooling system can control the temperature within 313 K (40 °C) for battery with heat generation rate of 120,183 W/m3 applying 6 mm thickness of PCM, thus reducing the overall size of the cooling system by 16.3%. It is also predicted that the hybrid cooling system can further improve its performance by increasing the coolant flow rate beyond 2 L/min. Under the 0.5C discharge condition, hybrid cooling can be manageable with zero pumping losses.
7 citations
01 Jun 2020
TL;DR: In this paper, the effects of different PV/PCM system's tilt angles on the PCM's melting behavior that causes the system's temperature were investigated. And the effect of convection heat transfer mechanism with different tilt angle on the heat transfer inside PV and PCM container, and the effects on the PV panel electrical performance-enhancing.
Abstract: The use of phase change material (PCM) for enhancing the thermal effect of photovoltaic (PV) panels has been studied by a number of researchers in recent years. Tilt angle of the installed PV panels has a great influence on the power generation especially for the fixed type installation. This study presents an experimental-based approach to investigate the effects of utilizing PCM to manage the PV system's thermal behaviours. It includes (1) the effects of different PV/PCM system's tilt angles on the PCM's melting behaviour that causes the rising the system's temperature, (2) the effects of convection heat transfer mechanism with different tilt angle on the heat transfer inside PV/PCM container, and (3) the effects on the PV panel electrical performance-enhancing. The tilt angles used in this study are 0°, 30°, 60° and 90°. The results show that the increase in the PV/PCM system tilt angle from 0° to 90° led to a decrease in the PV's cell temperature from-0.4% to -12%, due to the fact of the overwhelming effect of the natural convection regime inside PCM container as a passive cooling mechanism. As a result, the PV cell's electrical performance is improved where Isc decreases from -0.1% to -3%, Voc increases from 0.2% to 7%, and the fill factor increases from 0.1% to 3%. With these improvements, the electrical efficiency of the PV cell is increased from 0.2% to 5%.