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Teuku Meurah Indra Mahlia - One of the best experts on this subject based on the ideXlab platform.

  • Beeswax as Phase Change Material to improve solar panel's performance
    IOP Conference Series: Materials Science and Engineering, 2018
    Co-Authors: Razali Thaib, Teuku Meurah Indra Mahlia, Samsul Rizal, Medyan Riza, T. A. Rizal
    Abstract:

    One of the main obstacles faced during the operation of photovoltaic (PV) panels was overheating due to excessive solar radiation and high ambient temperatures. In this research, investigates the use of beeswax Phase Change Materials (PCM) to maintain the temperature of the panels close to ambient. Solar panels used in this study has 839 mm length, 537 mm wide, and 50 mm thick, with maximum output power at 50 W. During the study, there were two solar panels was evaluated, one without Phase Change Material while the other one was using beeswax Phase Change Material. Solar panels were mounted at 15° slope. Variables observed was the temperature of solar panel's surface, output voltage and current that produced by PV panels, wind speed around solar panels, and solar radiation. The observation was started at 07:00 am and ended at 06:00 pm. The research shows that maximum temperature of solar panels surface without Phase Change Material is ranging between 46-49 °C, and electrical efficiency is about 7.2-8.8%. Meanwhile, for solar panels with beeswax Phase Change Material, the maximum temperature solar panels surface is relatively low ranging between 33-34 °C, and its electrical efficiency seems to increase about 9.1-9.3%.

  • thermal properties of beeswax graphene Phase Change Material as energy storage for building applications
    Applied Thermal Engineering, 2017
    Co-Authors: Muhammad Amin, Erwin Prawiro, Rizky Achmad Luanto, Engkos Achmad Kosasih, Teuku Meurah Indra Mahlia, Nandy Putra
    Abstract:

    Abstract Increased energy consumption in buildings is a worldwide issue. This research is concerned with the implementation of a Phase Change Material for thermal storage. This concept has gained great attention as a solution to reduce energy consumption in buildings. Beeswax, which is a Phase Change Material with a high thermal capacity, is investigated in this research. This paper is intended to measure and analyze the thermal properties of beeswax/graphene as a Phase Change Material. The melting temperature, thermal capacity and latent heat were determined using differential scanning calorimetry (DSC), and the thermal conductivity was investigated using a thermal conductivity measurement apparatus. To discover the Change in the physical properties due to the effect of nanoparticles, the viscosity of the Material was investigated as well. Based on the result from the DSC, the latent heat of 0.3 wt% beeswax/graphene increased by 22.5%. The thermal conductivity of 0.3 wt% beeswax/graphene was 2.8 W/m K. The existence of graphene nanoplatelets enhanced both the latent heat and thermal conductivity of the beeswax. Therefore, based on this result, beeswax/graphene is concluded to have the potential to reduce energy consumption in buildings.

Ahme Sari - One of the best experts on this subject based on the ideXlab platform.

  • thermal performance of Phase Change Material integrated heat pipe evacuated tube solar collector system an experimental assessment
    Energy Conversion and Management, 2020
    Co-Authors: K Chopra, A K Pandey, Ahme Sari, Ati K Pathak, S Anand, V V Tyagi
    Abstract:

    Abstract This manuscript presents an experimental investigation of heat pipe evacuated tube solar collector with and without Phase Change Material for water heating application under the same weather conditions. In this study, a comparative analysis of two systems has been done in the same weather condition. Where evacuated tubes of the first system (evacuated tube collector-A) were left without Phase Change Material and second system (evacuated tube collector-B) was integrated with SA-67 as Phase Change Material. In order to ensure the thermal and chemical stability of the selected Phase Change Material, thermal cycling treatment was carried out. The results showed that SA-67 has excellent chemical and thermal stability even after 1500 thermal cycling treatment. In order to analyze the thermal performance of the designed systems, the experiment was conducted with five different water flow rates (8, 12, 16, 20 and 24 L per hour). The daily thermal efficiency of evacuated tube solar collector with and without Phase Change Material was varied in the range of 42–55% and 79–87% respectively. Although, the daily energy efficiency of evacuated tube collector integrated with Phase Change Material was 37.56%, 35.31%, 36.69%, 32.34%, and 32.73% higher than evacuated tube collector without Phase Change Material for water flow rates of 8, 12, 16, 20 and 24 L per hour respectively. The daily thermal efficiency for both systems was maximum at the flow rate of 20 L per hour. The heat transfer parameters for the designed systems have also been evaluated and compared.

Orhan Uzun - One of the best experts on this subject based on the ideXlab platform.

  • preparation characterization and thermal properties of microencapsulated Phase Change Material for thermal energy storage
    Solar Energy Materials and Solar Cells, 2009
    Co-Authors: Cemil Alkan, Ahmet Sari, Ali Karaipekli, Orhan Uzun
    Abstract:

    Abstract This study is focused on the preparation, characterization, and determination of thermal properties of microencapsulated docosane with polymethylmethacrylate (PMMA) as Phase Change Material for thermal energy storage. Microencapsulation of docosane has been carried out by emulsion polymerization. The microencapsulated Phase Change Material (MEPCM) was characterized using scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) spectroscopy. Thermal properties and thermal stability of MEPCM were measured by differential scanning calorimetry (DSC) and thermal gravimetric analysis (TGA). DSC analysis indicated that the docosane in the microcapsules melts at 41.0 °C and crystallizes at 40.6 °C. It has latent heats of 54.6 and −48.7 J/g for melting and crystallization, respectively. TGA showed that the MEPCM degraded in three distinguishable steps and had good chemical stability. Accelerated thermal cycling tests also indicated that the MEPCM had good thermal reliability. Based on all these results, it can be concluded that the microencapsulated docosane as MEPCMs have good potential for thermal energy storage purposes such as solar space heating applications.

Zhezhe Peng - One of the best experts on this subject based on the ideXlab platform.

  • Polymer based Phase Change Material for photo-thermal utilization
    Solar Energy Materials and Solar Cells, 2021
    Co-Authors: Jian Liu, Xuelin Zou, Cai Zhuodi, Zhezhe Peng
    Abstract:

    Abstract Phase Change Materials are widely used as thermal capacitors in solar thermal systems. The Phase Change Materials with carbon Materials could directly absorb the solar energy and transfer to water for building heating, while are rarely reported. In this work, an Ethylene-Propylene-Diene Monomer based Phase Change Material with expanded graphite is prepared. The photo-thermal performance of the Phase Change Material is investigated with combined experimental and numerical method. The SiO2 aerogel is first used as the thermal insulator in the solar thermal systems with the high transmittance and low thermal conductivity. The effect of the Phase Change Material height and tube passes number on the photo-thermal performance of the Phase Change Materials are calculated. The results show that the new Material has a tensile strength of 3.6 MPa, enthalpy of 126.8 J g−1，and thermal conductivity of 1.106 W m−1 K−1. The Phase Change Material with SiO2 aerogel could resist heat lost on the surface. The Phase Change Material has good photo-thermal performance in solar thermal systems, could heat more than 200 L of hot water at daytime.

Mahboobe Mahdavi - One of the best experts on this subject based on the ideXlab platform.

  • Numerical study of finned heat pipe-assisted thermal energy storage system with high temperature Phase Change Material
    Energy Conversion and Management, 2015
    Co-Authors: Saeed Tiari, Songgang Qiu, Mahboobe Mahdavi
    Abstract:

    In the present study, the thermal characteristics of a finned heat pipe-assisted latent heat thermal energy storage system are investigated numerically. A transient two-dimensional finite volume based model employing enthalpy-porosity technique is implemented to analyze the performance of a thermal energy storage unit with square container and high melting temperature Phase Change Material. The effects of heat pipe spacing, fin length and numbers and the influence of natural convection on the thermal response of the thermal energy storage unit have been studied. The obtained results reveal that the natural convection has considerable effect on the melting process of the Phase Change Material. Increasing the number of heat pipes (decreasing the heat pipe spacing) leads to the increase of melting rate and the decrease of base wall temperature. Also, the increase of fin length results in the decrease of temperature difference within the Phase Change Material in the container, providing more uniform temperature distribution. It was also shown that number of the fins does not have a significant effect on the performance of the system.