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energy that can be collected. In a typical industrial situation, the EuroTrough-150 (ET150) solar trough uses mirrors that have a reflectivity of .94 meaning that 94% of solar irradiance that strikes the surface of the trough will be reflected to its focal point (Montes, 2009). This value is much greater than common mirrors which typically have a reflectivity closer to 0.7. If the irradiance is not reflected by the mirrors surface it likely absorbed into the mirror. 2.2.2 Glass Envelope – Transmissivity After being reflected by the surface of the trough, the energy is focused onto the receiver tube. A glass envelope on the outside of the receiver tube must allow the majority of the energy to pass through it, implying high transmissivity. Transmissivity is a material property defined as the fraction of irradiance that is allowed to pass through it compared to the total amount of irradiance striking it. The ET150 uses a glass tube that has transmissivity of 94.5% (Montes, 2009). The purpose of the glass envelope is to enclose the absorber tube within an evacuated volume. This maximizes the solar irradiance that is absorbed while at the same time minimizing convective loss. Forristall’s calculations showed that the evacuated glass tube is extremely important (Forristall, 2003). Even though the absorber tube will be heated to very high temperatures the vacuum minimizes convective losses to the surroundings since there is little to no medium by which the heat energy can be transferred. For this reason, the glass enclosing the absorber tube must be highly transmissive, such as the glass used in the ET150. 20PDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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