Experimental Studies On Spherical Capsule By Using Different Fin Geometry
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1 Experimental Studies On Spherical Capsule By Using Different Fin Geometry A.V.Krishna Chaitanya Dept. of Mechanical Engineering G.PullaReddy Engineering College (Autonomous) Kurnool, Andhra Pradesh, India E.Siva Reddy Dept. of Mechanical Engineering G.PullaReddy Engineering College (Autonomous) Kurnool, Andhra Pradesh, India Abstract Now a days conventional energy sources are depilated in a faster way, to meet the increasing demand of energy so many researches are paying attention towards the renewable energy sources. Thermal energy storage system is one of the important energy conservation system in which PCM is used to store the thermal energy. The present paper studies the performance of circular fins which are encapsulated in a spherical capsules, which are filled with different types of PCM s. Water is used as heat transfer fluid in a thermal energy storage tank. Simulations of charging and discharging process are performed and the results are obtained. Keywords- LHS-latent heat storage, SHS-sensible heat storagepcm-phase changing material,htf-heat transfer fluid,tes-thermal energy storage ***** I. INTRODUCTION The conventional energy sources are depleting day by day in a very faster rate to meet the increasing energy demand, Developing an efficient and inexpensive energy storage devices is as important as developing new sources of energy. Thermal energy storage is one of the important methods of energy conservation. The thermal energy storage (TES) can be defined as the temporary storage of thermal energy at high or low temperatures. The TES is not a new concept, and at has been used for centuries. Energy storage can reduce the time or rate mismatch between energy supply and energy demand, and it plays an important role in energy conservation. The thermal energy storage units are utilized at industries for various purposes. Thermal energy is stored in three types, sensible, latent and reversible chemical storage. We mainly adopt the sensible heat and latent heat for the energy storage purpose. sensible heat is a heat exchanged by a body or thermodynamic system that changes the temperature, and some macroscopic variables of the body, but leaves unchanged certain other macroscopic variables, such as volume or pressure, but sensible heat storage method having disadvantages that it behaves like non-isothermal during charging and discharging processes. Latent heat is energy released or absorbed, by a body or a thermodynamic system, during a constant temperature process. Latent heat storage plays an important role in energy conservation of environmental conditions. Lot of comparisons are there between Latent heat storage and sensible heat storage, The material undergoes to phase change in the (LHS) due to latent heat of fusion. Thermal energy storage using the latent heat of PCM has received considerable attention these days for exploiting temporal energy source such as solar energy. Thermal energy system utilizes the PCM to maintain a constant temperature over a period of time and undergoes cyclic variations of melting and solidification. The heat transfer and fluid movement during this process has an impact on performance. In the thermal energy storage system, a spherical container is most commonly used for storing PCM.This is mainly due to its low volume to heat transfer surface area ratio. The density difference between the solid and liquid PCM causes a movement of solid up or down. Depending upon the densities, the melting phenomenon changes due to the movement of solid PCM. In this paper of study latent heat storage is achieved by encapsulated phase change material in the spherical capsule with the circular fin inserted in the ball. The heat transfer analysis in the spherical capsules are done by comparing with different types of phase changing materials with different fin materials which is surrounded by sensible heat storage material (water). Graphs are obtained between temperature changes in the spherical capsule according to the circulation of HTF with respect to time, and conclusions are made regarding the optimum phase changing material and circular fin material. II. EXPERIMENTAL PROCEDURE A water tank with capacity of 5litres is taken and filled with water. A 2000watts thermostat heater is used to raise the temperature of water upto 80 C. A mm square shaped container is used to incorporate a spherical capsule in it. A insulating material glass wool is used as insulator for the container. An opening is provided at the top and bottom of the container for the passage of HTF to pass through it. The hot water from the storage tank is circulated into the container with the help of a centrifugal pump, the finned spherical capsules are introduced into the insulated container, with help of thermocouples the temperature changes in the ball are recorded. After water reaching a temperature of 80 C, it is then allowed to pass over the spherical capsules with the help of ball valve. When the hot water is encountered with the spherical capsule, the PCM inside the ball starts melting. This process continues until the temperature inside the ball reaches 63
2 70 C-75 C, It is called charging process. The variations of the PCM temperature and HTF temperature are recorded with the help of the thermocouples which are located at various locations inside the ball. During the charging process the changes in the temperature readings are noted for every 5 min. During the discharging process the readings are noted for every half an hour until the temperature of the PCM reaches room temperature i.e;33 C-35 C. III. PROCESS OF DISCHARGING In this process the balls which are charged i.e if the temperature inside the ball and the PCM reaches 72⁰C-75⁰C degrees we assume that the PCM is completely melted and the balls are fully charged. It is then allowed to take out from the insulated container and is interacted with the atmospheric conditions, the thermocouples which are at different locations in the ball are connected to the digital indicator and the readings are noted for every half an hour in this way the discharging process takes place. IV. IMAGES OF THE PROJECT V. RESULTS 64
3 In the above graph we can see that the PCM used is stearic acid, which has the melting temperature of nearly (52⁰C- 55⁰C), the balls here are encapsulated with circular fins which are opened at the top side and are sealed at the inner side, the water is allowed at the flow at 4lit/min, over the surface of the ball, here the water will be flown through the fin cross-section so that fins will be helping indirectly for the melting of PCM i.e charging process. Here the graphs are drawn for the following data Time taken for the charging process is 90 min Time taken for the charging process is 105 min In the above graph we can see that the PCM used is stearic acid, Time taken for the charging process is 75 min. Time taken for the charging process is 90 min. In the above graphs we can see that the PCM used is stearic acid, 65
4 Fin material Brass Time taken for the charging process is 110 min. Time taken for the charging process is 115 min. acid, which has the melting temperature of nearly (63⁰C-65⁰C) Time taken for the charging process is 115 min. Time taken for the charging process is 95 min. acid, which has the melting temperature of nearly (63⁰C-65⁰C) 66
5 drawn we can conclude that optimum phase changing material is stearic acid and optimum fin material is copper for heat transfer analysis. REFERENCES acid, which has the melting temperature of nearly (63-65) Time taken for the charging process is 125 min. VI. CONCLUSION An thermal energy storage system is developed with an circular fin arrangement, which is encapsulated in Mild steel the spherical ball of 150 mm dia to store to latent heat in it, Different types of phase changing materials such as stearic acid, paraffin wax, myristic acid, palmitic acid, and the water as HTF is allowed to flow over the surface of the ball as a sensible heat element, and different types of fin materials such as mild steel, copper, brass are introduced into the ball surface for to analyze the heat transfer between them. The discharging process continued for nearly 48 hours to reach the room temperature of (34 degres) for the ball containing stearic acid, followed by paraffin wax 45 hours, myristic acid 42 hours, palmitic acid 40 hours, so from the experiments and the graphs [1] N.H.S. TAY,F. Bruno, M.Belusko, Experimental validation of a CFD model for tubes in a phase change thermal energy storage systems, appl.energy 91(1)(2012) [2] M, Faizal, R.Saidur, S.mekhilef, Energy, economic and environmental analysis of metal oxides nano fluid for flat-plate collector ln; presented at the 4th international conference on energy and environment;2013. [3] Amrit om Nayak,G.Ramkumar,T.manoj and R.vinod comparative study between the experimental analysis and CFD software Analysis of PCM material in Thermal Energy Storage System solar energy1994 ppl [4] lippong tan, yuenting kwok,ahbijit date, numerical analysis of natural convection effects in latent heat storage using different fin shapes heat transfer 13(1998) [5] N.A.M. Amin,F. Bruno,M. Belusko effectiveness-ntu correlation for low temperature PCM encapsulated in spheres,appl.energy(1)(2012) [6] N.A.Rahim, E.Osterman, v.v tyagi Review of PCM based cooling technologies for buildings 15(2)(2011) [7] N. Nallusamy, Effective utilization of solar energy for water heating applications using combined sensible and latent heat storage system, in Proceedings of the International Conference on New Millennium Alternate Energy Solutions for Sustainable Development, pp , PSG Tech, 2003 [8] K. A. R. Ismail and J. R. Henr ıquez, Numerical and experimental study of spherical capsules packed bed latent heat storage system, Applied Thermal Engineering, vol. 22, no. 15, pp , [9] Y. Shiina and T. Inagaki, Study on the efficiency of effective thermal conductivities on melting characteristics of latent heat storage capsules, International Journal of Heat and Mass Transfer, vol. 48, no. 2, pp , 2005 [10] Saitoh T, Hirose K. High Rayleigh numbers solutions to problems of latent heat thermal energy storage in a horizontal cylindrical capsule. ASME J Heat Transfer 1982;104:
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