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2.2.3 Receiver Tubes – Absorptivity Heat transfer fluid flows through the absorber tube which itself is within the glass envelope. With this component, the relevant criterion is absorptivity which is the fraction of irradiance that is absorbed by a surface (Incropera, 2007). A highly absorbent coating on the absorber tube maximizes the amount of energy transferred to the heat transfer fluid. The absorptivity of the tubes used in at the ET150 trough is .94. These tubes must be made of a material that can withstand extremely high temperatures of up to 400°C (752°F). 2.3 Heat Transfer Fluid After the sun’s energy is reflected from the surface of the trough, transmitted through the glass envelope and absorbed by the absorber tube, it conducts through the absorber tube wall and is transferred by convection into the heat transfer fluid (HTF). The appropriate heat transfer fluid is selected based on properties that include cost, safety, heat capacity and vapor pressure. Vapor pressure is the more important thermal property. With a greater heat capacity, the fluid transfers more energy without a substantial change in temperature. It is best for the vapor pressure to be low so that the heat transfer fluid can be heated to very high temperatures without having to increase the thickness of the absorber tubes significantly minimizing cost. Therminol VP-1 is the heat transfer fluid that is used at the majority of the SEGS facilities. Units II-IX at the SEGS plants have HTF outlet temperatures ranging from 321- 391°C (610-736°F). Therminol VP-1 under liquid conditions has and operating temperature in the range of 12-399°C (54-750°F) (Solutia, 2012). 21PDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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