IMPACT OF SELECTIVE SURFACE ON PERFARMANCE OF SOLAR THERMAL SYSTEM

S.Nagarajan (421313114022)S.Vigneshvaran (421313114044)

ABSTRACT

In order to overcome the current energy challenges and to find new ways of producing clean energy, the solar sector is focused on improving its performance and defining the adequate technology for each application. Nowadays the solar power which uses solar stills, is the most nature and well-established concept. The technology is based on the concentration of solar radiation and focusing the collected energy on a receiver tray. Solar selective coatings are applied on the surface of the receiver tray surface to improve its performance in stable conditions, but these coatings suffer stresses during their operating lives, which reduce their optical properties and increase the cost of the produced energy. In this study it has been analyzed the impact of selective surface coating in the energy gain and thermal losses.

OBJECTIVE OF THE WORKTo design & develop a water distillation system that

can purify brackish water from nearly any source, a

system that is relatively cheap & depends only on

renewable solar energy.

Through this project improving the design of a

subsequent influence on productivity is proposed to be

studied.

PRINCIPLES OF CORROSION

Corrosion is the disintegration of an engineered material into its constituent atom due to chemical reactions with its surroundings. In the most common use of the word, this means electrochemical oxidation of metals in reaction with an oxidant such as O2.

INTRODUCTIONMetallic corrosion reactions are electrochemical in

nature.An electrochemical reaction is associated with

charge transfer in addition to mass transfer.All electrochemical reactions may be split into two

or more partial oxidation and reduction reactions.The human system cannot endure

Temp above 50C or below 20C Pressures above or below our atmospheres Presence of harmful gases such as CO, H2S, and

H2.

Effects of corrosionReduces strengthLife time is reducedMetallic properties are lostWastage of metal

IMPORTANCE OF CORROSION DATA 5 mpy Good corrosion

resistant material

5 to 50 mpy Low corrosion resistant material

50 mpy Unsuitable as constructional material

CORROSION DAMAGEDisfiguration or loss of appearance Loss of material Maintenance cost Extractive metallurgy in reverse- Loss of precious

minerals, power, water and man-power Loss in reliability & safetyPlant shutdown, contamination of product etc

COPPER

ALUMINIUM

MILD STEEL

STAINLESS STEEL

control the corrosion in low cost

BLOCK CHROME100% mirror like chromed effect very good lasting application easiness with special equipment practically applicable on any surface

They are a technology allowing to get CHROME EFFECT on surface impossible to be Chromed by traditional technologies (Silver plating and Vacuum system)

They have a high covering power, ever able to give you a mirror like look 100%

They can be applied on any surfaceTo have the maximum employ versatilityThey have an effect lasting in time and resisting to

use and weather conditions besides to special quality tests

They are enough easy to be applied because application easiness means time spare

RUST OLIUM

RUST OLEUMThe ultimate protection for industrial

environments. Formulated with the highest quality pigments and resins, the High Performance brand of coatings has the highest paint solids in the industry.

These proprietary formulations are designed for severe industrial environments and are backed by a Rust-Proof Guarantee.

The High Performance brand is the foundation of Rust-Oleum Corporatio

RUST OLEUM SPRAY PAINT

Thurmalox

Thurmalox spray paintSolar Selective CoatingThurmalox 250 Selective Black, silicone-

based paint which collects heat more efficiently than ordinary black paint and resists outgassing to 400F.

FeaturesResists outgassing to 400°F (204°C)Heat resistant to 1,000°F (538°C)Doesn't peel, flake or chalkWon't bleach or discolour Withstands repeated thermal cyclingResistant to UV degradationDries for handling in 30 minutesAir dry or heat cure Long lasting

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