Abstract
Solar energy harvesting through parabolic trough concentrator is finding wide range of application since it can work in the range of 40 °C to 800 °C. Parabolic trough concentrators are widely used in power generation plants and industrial process heating application as it can operate in the low and medium temperature. This is achieved by the selection of suitable heat transfer fluid in the receiver tube of the concentrator. The thermophysical properties of the working fluid plays an important role in enhancing the overall efficiency of the collector. The conventional heat transfer fluid used are water, ethylene glycol and Theminol oil which operate in the low temperature range. But recent researches in the field reveals that different type of nanofluid, can increase the working temperature of the heat transfer fluid and enhance the thermal conductivity and heat transfer properties of the fluid. This paper reviews the type of nanoparticles suspended in the based fluid forming a nanofluid, preparation techniques, their thermoophysical properties which make it suitable for replacing the conventional heat transfer fluid in the PTC.
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