Thermal Energy Storage Essay
DESIGN AND FABRICATION OF PCM ENCAPSULATED THERMAL ENERGY STORAGE SYSTEM FOR WASTE HEAT RECOVERY FROM ELECTRIC HEATER
Ponrajan Vikram M*, Meikandan Ma, Senthil Kumar Pb
*,a,b Department of Mechanical Engineering, Anna University, Chennai 600025-India
ABSTRACT
The exhaust engine gas from an internal combustion engine carries away about 30% of heat of combustion. The energy available in the exit stream of many energy conversion devices goes as waste. It is recovered by using heat exchanger and the can be stored in thermal energy storage tank. In this present work the thermal storage tank is designed and fabricated using two types of paraffin wax material contained in cylindrical capsule.
The main aim of the project is to store the heat content
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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. Energy storage improves performance of energy systems by smoothing supply and increasing reliability. For example, storage would improve the performance of a power generating plant by load levelling. The higher efficiency would lead to energy conservation and improve cost effectiveness. Some of the renewable energy sources can only provide energy intermittently. Two particular problems of thermal energy storage systems are the heat exchanger design and in the case of phase change materials, the method of encapsulation. The heat exchanger should be designed to operate with as low a temperature difference as possible to avoid inefficiencies. Latent heat thermal energy storage systems, using phase change materials to store heat or coolness, have many applications.
Methods Of Thermal Energy Storage
There are three basic methods for storing thermal energy. They are
1. Heating a liquid or a solid, without changing phase: This method is called sensible heat storage. The amount of energy stored depends on the temperature change of the material and can be expressed in the form E= ∫ mCpdT (1) where m is the mass in (kg)
Cpthe specific heat at constant pressure. (J/kg
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