SOLAR THERMAL STORAGE SYSTEM
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01-10-2010, 12:07 PM
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SOLAR THERMAL STORAGE SYSTEM
This article is Submitted by
MD. SADIQ. B
MOHAMMED FAIZAN. A
Increasing energy consumption, shrinking resources and rising energy costs will have significant impact on our standard of living for future generations. In this situation, the development of alternative, cost effective sources of energy has to be a priority. Designing energy efficient and affordable dwellings located in harsh climate regions present significant challenges.This project and implimentation presents the advanced technology and some of the unique features of a novel solar system that utilizes solar energy for space heating and water heating purpose in residential housing and commercial buildings.
The improvements in solar technology offers a significant cost reduction, to a level where the solar system can compete with the energy costs from existing sources.The main goal of the project and implimentation is to investigate new or advanced solutions for storing heat in systems providing heating. which can be achieved using phase change material(PCM).A phase change material with a melting/solidification temperature of 50ºC to 60ºC is used for solar heat storage. When the PCM undergoes the phase change, it can absorb or release a large amount of energy as latent heat. This heat can be used for further applications like water heating and space heating purposes. Thus solar thermal energy is widely used for space heating and domestic water heating .
UTILISATION OF RENEWABLE ENERGY
The aim of the project and implimentation is to utilise the renewable energy wasted in large amount. One of the major renewable energy resources is the solar energy which sun emits to the earth. The solar energy can be utilised to a higher extent in areas having harsh climatic conditions like India.
The sun emits solar radiation as much as 1395 W/m2. To utilise this energy solar collectors are used. The most economic and efficient solar collector is the flat plate collector which absorbs solar radiation and the heat is transferred to the water inside the tubes of the collector. Further, to store the energy and utilise later, phase change material (PCM) is used which absorbs large amount of heat from water inside the tank and releases its latent heat when the temperature of PCM reaches its melting point.
PRINCIPLE OF HEAT RECOVERY FROM SOLAR ENERGY
Solar energy is recovered using a collector with a tank connected to it through hoses which forms a closed circuit. The principle behind the Solar Thermal Storage System (STSS) is the Gravity Convection which is the natural movement of heat that occurs when a warm fluid (water) rises and a cooler fluid sinks under the influence of gravity. This is also called Thermosyphoning.
NECESSITY OF THERMAL STORAGE SYSTEM
Thermal storage units have received greater attention in solar and waste heat recovery thermal applications because of its large heat storage capacity and their isothermal behaviour during charging and discharging process. The major technical constraint, which prevents successful implementation of heat recovery system, is intermittent and time mismatched demand and availability. In order to overcome the above constraint, thermal storage unit can be implemented. Thermal energy storage provides one practical means of storing energy during the availability and use this energy when need arises.
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