Solar Water Heating - India

Topics: Solar thermal energy, Solar thermal collector, Solar water heating Pages: 7 (1854 words) Published: August 5, 2013
Dated 17.01.2011

1806 words Manish Kumar

A write up on Solar Water Heating System & JNNSM in India


Solar energy, being abundant and widespread in its availability, makes it one of the most attractive sources of energies. Tapping this energy will not only help in bridging the gap between demand and supply of electricity but also save money in the long run. A 100-litre capacity Solar Water Heating System (SWHS) can replace an electric geyser for residential use and may save approximately 1500 units of electricity, annually, under Indian conditions. It has also been estimated that a 100 litre per day (lpd) system (2 m2 of collector area) installed in an industry cans save close to 140 litres of diesel in a year. Based on the above equivalence (100 lpd system saves 1500 units of electricity), it is estimated that in generating the same amount of electricity from a coal based power plant, 1.5 tonnes of CO2 is released into atmosphere annually. One million SWHS installed in homes will, therefore, result in reduction of 1.5 million tonnes of CO2 emission into the atmosphere.


The Jawaharlal Nehru National Solar Mission (JNNSM) is a major initiative of the Government of India and State Governments to promote ecologically sustainable growth while addressing India’s energy security challenge. It will also constitute a major contribution by India to the global effort to meet the challenges of climate change.

The immediate aim of the Mission is to focus on setting up an enabling environment for solar technology penetration in the country both at a centralized and decentralized level. The first phase (up to 2013) will focus on capturing of the low hanging options in solar thermal; on promoting off-grid systems to serve populations without access to commercial energy and modest capacity addition in grid-based systems. In the second phase, after taking into account the experience of the initial years, capacity will be aggressively ramped up to create conditions for up scaled and competitive solar energy penetration in the country. Some of the targets of the solar mission with regards to SWHS are : • To create favourable conditions for solar manufacturing capability, particularly solar thermal for indigenous production and market leadership. • To promote programmes for off grid applications, reaching 1000 MW by 2017 and 2000 MW by 2022.

The Mission in its first two phases will promote solar heating systems, which are already using proven technology and are commercially viable. The Mission is setting an ambitious target for ensuring that applications, domestic and industrial, below 80 °C are solarised. The key strategy of the Mission will be to make necessary policy changes to meet this objective:

• Firstly, make solar heaters mandatory, through building byelaws and incorporation in the National Building Code, • Secondly, ensure the introduction of effective mechanisms for certification and rating of manufacturers of solar thermal applications, • Thirdly, facilitate measurement and promotion of these individual devices through local agencies and power utilities, and • Fourthly, support the upgrading of technologies and manufacturing capacities through soft loans, to achieve higher efficiencies and further cost reduction.

SWHS Data in India
|Indian scenario of solar water heating collector area | |Techno Economic Potential |40 million m2 | |National solar mission goal |20 million m2 by 2022 | | |7 million m2 by 2013 | |Demand Projection |18.7 million m2 by 2022...
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