This experimental and numerical investigations presents the improvement in heat Transfer performance of absorber/receiver using silver nano particle dispersed in DI water (De-Ionized water).The nano particle suspended in conventional fluid have superior heat transfer capabilities .The absorber is tested for heat input ranging from 500 W/m2-6000 W/m2 in four steps which is suitable for removing heat from solar system, process industries, power plants, automobile systems etc. The effect of various operational limits and test parameters such as heat input, volume fraction, fluid temperature, heat transfer coefficient are experimentally and numerically investigated. The silver nano particle is tested for volume concentration in the range of 0≤ φ≤5 %, 2000 ≤Re ≤6000, experimentally with average nano particle diameter 10nm-400 nm .The experimental results are evaluated in terms of performance matrices by direct measurements of fluid temperature and surface temperature in the absorber. A substantial reduction in thermal resistance of 23. 2% observed for 0.00011% concentration of silver nano particle in comparison with water at same twist ratio. The heat transfer coefficient increases from 29 % to 87 %.