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Absorber Coating: a Rising Industry in India

Submitted by Baerbel Epp on July 8, 2009

 India’s coating industry” India's coating industry has shown impressive growth rates over the last ten years. Just one manufacturer of selective coating dominated the industry a decade ago: Solchrome, who had obtained the technology from Canada. Today, 8 manufacturers are using the Nalsun technology developed by the NAL.
Source: own research

Almost 93 % of today's coating for flat plate collector manufacturing in India is relying on the Nalsun technology developed by the National Aerospace Laboratory (NAL) in Bangalore in 1988. It uses a black chromium nano-thin coating and conforms to BIS 12933 with an emittance < 20 % and an absorptance > 95 %. The big advantages of this coating technology are the low investment and operating costs. As it is a black chromium bath with room temperature, Nalsun allows, besides the lower power costs, also considerable savings in terms of cooling costs. The absence of a nickel undercoat reduces the number of processing steps further, thereby contributing to lower operation costs. A machine with a coating capacity of 5,000 m2 requires an investment of only US$ 20,000.

Until April 2009, the technology was made accessible to 26 entrepreneurs. Eight of the solar coating manufacturers have already used it successfully – among them the three biggest ones, SpaceAge, Maharaja Techno Chrome and Midas India (see table below). The coating manufacturers questioned produced a total of 319,261 m2 throughout the Indian fiscal year from April 2008 to March 2009. They are fairly optimistic about the future development and want to increase their production output this fiscal year, by, on average, 55 % until April 2010. These findings are the conclusions of a market survey carried out by the solarthermalworld.org correspondent Jaideep Malaviya, who is based in Pune, India.

 

Name of the Company

Starting Year

Type of absorber

Produced surface area m2

 2008-09

Planned Production m2

2009-10

Website

Space-Age Electro Technology(India) Pvt. Ltd., Bangalore

2000

Cu\Al

120,000

170,000

www.spaceagesolar.com

Maharaja Techno Chromes, Bangalore

2000-2001

Cu\Al

60,000

100,000

www.maharajasolar.com

Midas India, Bangalore

2001

Cu

50,000

50,000

rajabrahamss@rediffmail.com

Sudarshan Saur Shakti, Aurangabad

2002

 

Cu

30,400

45,000

www.sudarshansaur.com

Solchrome System India Ltd, Parwanoo

1988

Cu

22,066

35,000

www.Solchrome.com

Rashmi Industries, Bangalore

2000

Cu

15,295

18,500

www.rashmisolar.com

Bhagyanagar India Ltd., Hyderabad

2006

Cu

12,600

55,000

www.surana.com

Vardhishnu Engineers Pvt. Ltd., Pune

2006

Cu

8,900

20,000

www.vardhsihnu.net

Total amount of coated material

319,261

493,500

www.vardhsihnu.net

Table: Production output of black chrome selective coating manufacturers in India, using the Nalsun technology

Source: own research

 

This text was written by Jaideep Malaviya, an Indian journalist and solar thermal expert. info@malaviya.in

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