2.9 A flat-plate collector in Nicosia, Cyprus, is tilted at 40° from horizontal and pointed 10° east of south. Calculate the solar incidence angle on the collector at 10:30 am and 2:30 pm solar times on March 10 and September 10.
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- A spherical radiator has a radius of 3ft and emissivity of 0.5. If radiates 6000 Btu/hr of heat at 3000R, what is the temperature of a surface affected by its radiation?6You have a telescope that consists of two converging lenses which are placed a distance apart which is approximately equal to the sum of their focal lengths. Focal length 1 is appriximatly 5.5cm and focal length 2 is approximatly 25cm. The lens closest to the onject should have a resonably long focal length and the eyepiece lens should have a relatively short focal length to get good magnification. a. draw a scale ray diagram for a telescope using one long and one short focal length lens. b. Estimate how much larger your distance object appears through your telescope and then calculate the angular magnification.
- The image shows the apparent magnitude of many objects. I want to know the apparent magnitude of the earth and how to get it from the equaiton in the image.4) For a long triangular groove shown in figure, calculate viewfactor F12 and F13. a 27 1 32 6Two panels of different materials are spaced 6m apart and at a 30-degree angle. The top panel is 2m x 1m. The top panel has an emissivity of 0.6. The bottom panel is made of a translucent material and has an absorptivity of 0.2 and a reflectivity of 0.5. a) If the top panel is kept at 100oC and the bottom panel at −50oC, how much radiation is the top panel emitting to the bottom panel? b) How much of that radiation passes through the bottom panel? c) What is the irradiation power, G?
- At the surface of the sun, the temperature is approximately 5800 K. How much energy is contained in the electromagnetic radiation filling a cubic meter of space at the sun's surface?On one side of a diverging lens of focal length 37.1 cm, you position an object of height 2.42 cm somewhere along the principal axis. The resultant image has a height of 0.97 cm. How far from the lens is the object located? 38.9 cm 55.5 cm 88.8 cm 72.2 cmExample 2.3 Calculate the angle made by beam radiation with normal to a fiat plate collector on December 1, at 9.00 AM. solar time for a location at 28° 35' N. The collector is tilted at an angle of latitude plus 10°, with the horizontal and is pointing due south.
- You can neglect radiation at the bottom of the plate; the bottom side of the plate has water flowing underneath it. Often, when dealing with liquids (rather than gases), one can neglect radiation because heat transfer due to convection is so much larger (liquids tend to have higher convection coefficient values than gases).Two point sources of coherent light with a wavelength of 700 nm are near each other. The light from these sources is interfering in space around them. If you determine there is destructive interference between the two sources at a point 70.35 μm away from the second source, how far away from this point might the first source be? (Note that the image shown is not drawn to scale.) Source 1 74.20 μm o 77.175 um - 80.85 um ○ 80.85 μm 80.85 μm ? Source 2 70.35 μm destructive interference hereFor an object at the geostationary height over latitude = 40.43113 deg and longitude = -86.91499 deg.