International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 07 | July 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1528 ANALYSIS OF THE HEAT TRANSFER DURING ENERGY STORAGE IN A TRIPLEX CONCENTRIC TUBE USING PCM D. Venkata Achyuth 1 , Dr. A. Sudhakar Reddy 2 and M. Murali Mohan Naik 3 1 M.Tech Student, Department of Mechanical Engineering, Annamacharya Institute of Technology and Sciences, KADAPA – 516003, Andhra Pradesh 2 Professor, Department of Mechanical Engineering, Annamacharya Institute of Technology and Sciences, KADAPA – 516003, Andhra Pradesh 3 Asst. Professor and Head, Department of Mechanical Engineering, Annamacharya Institute of Technology and Sciences, KADAPA – 516003, Andhra Pradesh --------------------------------------------------------------------------***---------------------------------------------------------------------------- Abstract:- This paper addresses a heat transfer investigation of a thermal energy storage unit involving PCM process dominated by heat physical phenomenon. The thermal energy storage unit involves a triplex concentric tube with phase change material (PCM) filling in the middle channel, with hot heat transfer fluid (HHTF) flowing outer channel during charging process and cold heat transfer fluid (CHTF) flowing inner channel during discharging process. The main objective of this work is to check the impact of the water temperature and also the flow of warmth transfer fluid (HTF, as well as HHTF and CHTF) on the thermal energy storage has been studied. Heat transfer coefficient, heat transfer rate and skin friction coefficient for the triplex concentric tube heat exchanger. 3D modeling is done by using creo2.0 and simulation is done with help of CFD in ANSYS. Keywords: triplex concentric tube, creo 2.0 and CFD 1. Introduction to heat exchanger Heat exchanger is a procedure hardware intended for the powerful exchange of warmth vitality between two liquids. For the warmth move to happen two liquids must be at various temperatures and they should come warm contact. Warmth trade include convection in every liquid and conduction through the isolating divider. Warmth can stream just from more sweltering to cooler liquids, according to the second law of thermodynamics. Fig 1.1:- Heat exchangers 1.2 Thermal energy storage: Energy resources on the earth will be exhausted one day if they are used in an unchecked way. This will cause serious problems and even crisis and jeopardize the survival of mankind. In China, with the rapid development of economy and the much improvement of people’s living standard, the problem of energy shortage becomes serious. Especially after early morning until midnight, this problem becomes more serious for more power consumption of industrial, commercial and residential activities during that period of time. There are two different ways to alleviate this significant circumstance somewhat. One is to move power utilization from pinnacle periods to off pinnacle periods. The other is to recoup the vitality which is utilized to be catapulted legitimately to the earth as squandered warmth, for example, the launched out warmth from the condenser of forced air system, or to gather and use the diurnally fluctuating warm vitality, for example, the sun based vitality. Regardless, a vitality stockpiling framework ought to be vital. Because of overall vitality deficiency, the advancement of productive and practical warm capacity framework