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was decided that the GHI and DHI would be measured and the DNI would be calculated. Equation 17 shows the relationship between the three types of radiation. () (17) In this equation DNI, GHI and DHI are the above mentioned types of irradiance and Z is the zenith angle, which is the angle measured between a vector normal to the surface of the earth and the vector which connects the Earth’s surface and the sun. When the sun is rising or setting, the zenith angle is 90 degrees. The equipment used to measure the GHI and DHI included two pyranometers, a shadow-band, computer with Labview software, a data acquisition system and a solar station. The 240-8101 Star Pyranometer was selected since it can measure irradiance ranging from 0 to 1,500 W/m2, operates over a temperature range from -40°C-60°C (- 40°F-140°F) and has a fast response time. There are two versions of the 240-8101 Star Pyranometer, one with an amperage output and one with a voltage output. Since the amperage output also requires a power supply to generate the electric signal, the voltage output pyranometer was selected for measurements in this research program. A model 240-152 Shadow Band was purchased to block the direct irradiance from the pyranometer measuring the DHI. This shadow band can be used at latitudes up to 60° and can have a declination angle adjustment from -25° up to 25°. The declination angle is the measured angle between the plane made by the Earth’s equator and the direct rays from the sun, thus its maximum and minimum are ±23.5 degrees since this is the angle of tilt of the 43PDF Image | WORKING FLUID SELECTION FOR AN INCREASED EFFICIENCY HYBRIDIZED GEOTHERMAL-SOLAR THERMAL POWER PLANT IN NEWCASTLE, UTAH
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