- 1. Solar Water HeatingSystemPresented By: BHANU PRATAP CIVIL ENGINEERING 3rd Year
2. INTRODUCTION India is blessed with solar energy in abundance at nocost. India is having high solar insolation of 46.5KWh/sq.m/day for an average of 280 sunny days andmost of that resource has been left untapped. One of the popular cost-effective devices that harnessthe solar energy is Solar Water Heating System (SWHS). SWHS heating system is a commercially viable andtechnologically mature product, is existing in country formany years with enormous potential. 3. HISTORY There are records of solar collectors in the United Statesdating back to before 1900, comprising a black-paintedtank mounted on a roof. SWHS has been widely used inGreece, Turkey, Israel, Australia, Japan, Austria andChina. Israel is a country, where solar water heaters are beingused since 1950s. There was a fuel crisis and restrictions were imposed onheating water using fossil fuel. Since then the Israelis are accustomed with heatingwater using SWHS. In 1980, the Parliament of Israelintroduced a law on mandatory solar heating for newresidential buildings 4. Scope in India India has a varying climate extending from extreme to moderatedue to its unique geographical features. Normally in the countryside, wood or biomass is used forheating and in urban areas electricity or fossil fuels are used forthis purpose. This practice is either expensive or degrades theenvironment. Therefore, solar water heating system can be a suitablealternative to meet the growing demand of hot water in thecountry without exerting further pressure on electricity or cuttingof forest trees from the forest areas. The SWHS has thepotential to save millions in energy costs in our country. 5. Steps Taken By Indian Government Ministry of New and Renewable Energy(MNRE), government of India and some state-level agencieshave formulated many schemes for promotion of SWHS. There are also provisions of providing soft loans under theinterest subsidy scheme through a network of financialinstitutions and tax benefits on all investments in solarenergy technologies. The Bureau of Energy Efficiency (BEE) as per provision ofthe Energy conservation Act 2001 has prescribed guidelinesfor Energy Conservation Buildings Code (ECBC), which setsminimum energy standards for design and construction ofbuildings. SWHS is one of the components covered underECBC to enhance energy performance of the buildings. With the objective of contributing to Indias Energy securityand sustainable development, the Prime Minister haslaunched Jawaharlal Nehru National Solar Mission (JNNSM)in January 2010. The objective of the mission is to establishIndia as a global leader in solar energy. 6. Uses of Solar Water Heating System Bathing. Laundry application in hotels, hospitals, hostels. Cooking (Pre-Heating of water helps in reduction of use of fuel). Various industrial applications. 7. Solar Water Heater 8. Contd., A solar water heater consists of a collector to collect solar energy and an insulated storage tank to store hot water. The total system with solar collector, storage tank and pipelines is called solar hot water system. The solar water heating systems are of two categories: 1) Closed loop system. 2) Open loop system. 9. Contd., In the closed loop system, heat exchangersare installed to protect the system from hardwater obtained from bore wells or freezingtemperatures in the cold regions. The openloop system has two categories 1) Thermosyphon.2) Forced circulation system. 10. Contd.,Thermosyphon systems are simple and relativelyinexpensive.The forced circulation systems employ electricalpumps to circulate the water through collectorsand storage tanks.The choice of system depends on heatrequirement weather conditions, heat transfer fluidquality, space availability, annual solar radiationetc. 11. Thermosyphon system 12. Conclusion There is a serious need to sensitize policy makers andusers in the residential and commercial sectors on theefficacy of SWHS. There is a perception that SWHS is more suited forindependent houses rather than apartment buildings. Butthe later would ideally have more roof space for an idealand attractive SWHS.The manufacturer and supplier base of the system hasto be strengthened, so that, they can also createawareness among potential users of SWHS. 13. Questions And Quarries 14. Thank you~!!