Fatigue Life of Piston

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Seminar Report
On
Theoretical Analysis for Controlling the System Temperature by using phase change material (PCM)

Presented by
Mr.Ajinkya R. Patil

INDEX
1. INTRODUCTION………………………………………………………...1 2. STATE OF THE ART OF PCM…………………………………………2 3.1 PCM CHARACTERISTICS………………………………………...2 3.2 PCM CLASSIFICATION…………………………………………...5 3.3 PCM PROPERTIES………………………………………………...3 3. THERMOPHYSICAL PROPERTIES DETERMINATION…………5

4.4 LONG TERM STABILITY…………………………………………5 4.5 STABILITY OF PCM CONTAINER SYSTEM………………......5 4.6 CORROSION OF THE MATERIAL………………………………5 4.7 PHASE SEGREGATION AND SUBCOOLING………………….H 4.8 FIRE RETARDATION OF PCM………………………………….K 4. ENCAPSULATION OF THE MATERIAL……………………………K 5. STORAGE CAPACITY AND THERMODYNAMIC PROPERTIES.K

6. SYSTEM APLICATIONS……………………………………………….K 7.9 FOR MASS CONCRETE BLOCK…………………………………K 7.10 IN REFRIGERATION PLANT……………………………………..K 7.11 FOR BRICK WALL………………………………………………….K 7.12 FOR COLD STOREGE OF PERISHEBLE PRODUCT…………..K 7. CONCLUSION……………………………………………………………..K 8. REFERENCES……………………………………………………………..K

1. Introduction: Demand of heat energy increased greatly in different fields of engineering during the last decade. Cooling and heating demand has already been increasing due to the evolving comfort expectations and technological development around the world. Climate change has brought additional challenges for cooling and heating systems designers. Efficient and economical technology that can be used to store large amounts of heat or cold in a definite volume is the subject of research for a long time. Thermal storage plays an important role in building energy conservation, which is greatly assisted by the incorporation of latent heat storage in building products. Devices which store heat during peak power operation and release the same during reduced power operation. Phase change material is one of the thermal storage devices. Phase change material (PCM) is very attractive in this case because of its high storage density with small temperature swing. PCM materials have high heats of fusion, which melting and solidifying at a certain temperature, is capable of storing and releasing large amounts of energy. A PCM temperature remains constant during the phase change, which is useful for keeping the subject at a uniform temperature. Heat is absorbed or released when the material changes from solid to liquid and vice versa; thus, PCMs are classified as latent heat storage (LHS) units. This seminar summarizes the current knowledge on phase change materials that could be suited for storing heat in various temperature systems, where temperatures between 20 and 50 °C are needed and a storage material able to store between 20 and 80C would be best suited. The seminar addresses properties of material, types of encapsulation and classification of organic and inorganic materials. The seminar shows also some limitations of phase change materials such as the heat exchange power.

2. STATE OF THE ART OF PHASE CHANGE MATERIAL:
2.1 PCM Characteristics: PCMs latent heat storage can be achieved through solid–solid, solid–liquid, solid–gas and liquid–gas phase change. However, the only phase change used for PCMs is the solid–liquid change. Liquid-gas phase changes are not practical for use as thermal storage due to the large volumes or high pressures required to store the materials when in their gas phase. Liquid–gas transitions do have a higher heat of transformation than solid–liquid transitions. Solid–solid phase changes are typically very slow and have a rather low heat of transformation. Initially, the solid–liquid PCMs behave like sensible heat storage (SHS) materials; their temperature rises as they absorb heat. Unlike conventional SHS, however, when PCMs reach the temperature at which they change phase (their melting temperature) they absorb large amounts of heat at an almost constant temperature. The...
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