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International Journal of Current Engineering and Technology E-ISSN 2277 – 4106, P-ISSN 2347 – 5161 ©2018 INPRESSCO®, All Rights Reserved Available at http://inpressco.com/category/ijcet Research Article Analysis of Paraffin Wax as a Phase Change Material P Vinod Kumar Naidu^* and Ajay M Nair# ^Department of Mechanical Engineering, Chaitanya Bharathi Institute of Technology, Hyderabad, India #Department of Mechanical Engineering, Toc H Institute of Science and Technology, Ernakulam, India Received 01 Nov 2017, Accepted 01 Jan 2018, Available online 09 Jan 2018, Vol.8, No.1 (Jan/Feb 2018) Abstract As the energy demand increases and with the conventional fossil fuels depleting, the energy crisis in the near future is bound to worsen. Moreover fossil fuels have adverse effects on the environment so it is required to switch on to renewable sources of energy to meet the energy requirements. Especially solar energy is abundantly available but it is intermittent, unpredictable, and available only during the day. An efficient thermal energy storage system is required for storing the surplus energy available during light hours so that it can be used during nights. This paper is focused on the charging and discharge analysis of Paraffin wax (melting temperature of 58-600C) which is used as phase change material in thermal energy storage system. To analyse the performance of Paraffin wax, a simple and economical experimental setup has been constructed that consists of solar parabolic concentrator, hot water bath, water pump, test section, insulation boxes, T type thermocouple and Data acquisition system. In the experiment conducted, the water which gets heated due to the solar parabolic concentrator charges the Paraffin wax in the test section. Once the Paraffin wax gets fully charged, it is taken out and kept in the insulation box .The temperature variation with time while charging and discharging is recorded. It is found that Paraffin wax took 3 hours and 7 minutes for getting completely charged and it took 15 hours 28 minutes for discharging i.e. there was a temperature drop of 20.86 0C from the initial temperature of 69.9 0C Keywords: Change Materials (PCMs), Chagrining, Discharging, Storage period 1. Introduction 1Energy is the backbone of all human activities on the earth and globalization and rapid economic growth has led to a rapid increase energy demand. Fossil fuels have been main source of energy for human need but it reserves are running out and fossil fuel causes environmental such as global warming and melting of ice in south and north poles. Therefore renewable energies like solar energy, bio energy wind energy, geothermal energy, tidal energy are investigated, even though solar energy is abundant available throughout the year in the most part of the earth, they are intermittent in nature as they are not available all the time, this intermittent problem can be solved by suitable energy storage. PCM based thermal energy storage is effective in nature. Jian-you et al studied effect of inlet temperature and flow rate of heat transfer fluid HTF (including the hot HTF and cold HTF) on the storage unit performance experimentally for the numerical model validation, N-Hexacosane (56.3 °C,LH-61 kcal/kg) as a PCM. The thermal energy storage unit composes of a triplex concentric tube filled with PCM in the middle *Corresponding author’s ORCID ID: 0000-0002-5835-4608 DOI: https://doi.org/10.14741/ijcet.v8i01.10888 channel, with hot HTF flowing through the outer channel during the charging process and cold HTF flows through the inner channel during the discharging process. Numerical and experimental results showed that every 2 °C enhancement of inlet temperature of cold HTF results in an average heat recovery rate increase of 0.042 kW. Hoshi et al classified the phase change materials based on their melting points temperature, such as low temperature phase change materials are the material having Melting Point temperature less than 220°C, medium temperature phase change materials are the material having Melting Point temperature up to 420°C and high temperature phase change materials are the material having Melting Point temperature greater than 420°C. Castell et al presented an experimental study of a PCM storage unit for cold storage applications. The study demonstrated that coil in storage unit designs are effective to delivering a constant outlet temperature and effective heat transfer with large surface areas. Halawa et al have studied numerically the thermal performance of an air based PCM storage unit which uses Chloride Hexahydrate (CaCl2,6H2O) MP at 28 °C for space heating application and the effects of temperature during the melting /freezing process and found out the high mass flow rate, 52| International Journal of Current Engineering and Technology, Vol.8, No.1 (Jan/Feb 2018)PDF Image | Analysis of Paraffin Wax as a Phase Change Material
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