You are designing a solar panel cover to protect rooftop solar panels from beingdamaged by debris. At some point during the day, the panels form a 60-degree angle relative to the sun’s rays. The panels are 3m x 1m wide. a) What property of incident radiation do you want to maximize to allow the maximize amount of light to hit the panels below your cover? b) If the absorptivity is 0.2 and the reflectivity is 0.1, what percentage of the radiation reaches the solar panels? c) If the irradiation, G, is 220 W/m2, how much power passes into the solar panels below the cover?

You are designing a solar panel cover to protect rooftop solar panels from beingdamaged by debris. At some point during the day, the panels form a 60-degree angle relative to the sun’s rays. The panels are 3m x 1m wide. a) What property of incident radiation do you want to maximize to allow the maximize amount of light to hit the panels below your cover? b) If the absorptivity is 0.2 and the reflectivity is 0.1, what percentage of the radiation reaches the solar panels? c) If the irradiation, G, is 220 W/m2, how much power passes into the solar panels below the cover?

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter42: Heat Gains And Heat Losses In Structures

Section: Chapter Questions

Problem 16RQ: Which of the following is(are) true regarding the solar gain on windows? A. The solar gain due to...

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Which of the following is(are) true regarding the solar gain on windows? A. The solar gain due to north-facing windows is greater than the solar gain due to south-facing windows. B. The solar gain due to east-facing windows is greater than the solar gain due to west-facing windows. C. The solar gain due to west-facing windows is greaterthan the solar gain due to east-facing windows. D. The solar gain due to south-facing windows is greaterthan the solar gain due to north-facing windows.
a) The energy of radiation emitted by Carborundum (Silicon Carbide) per unit area at 1000 K is approximately 4.87 watt / cm2. When the radiation from a black body heated to a temperature of 1000 K falls on a piece of Carborundum, how much of the energy is absorbed? b) Calculate the total energy density of the blackbody radiation with a temperature of 5000 K. c) At what temperatures does the maximum wavelength fall in the red (7.10-5 cm) and blue (4.5.10-5 cm) part of the visible spectrum?
a) b) Assume that the solar receiver has cooled to 600 K at some point during the night. What is the value of its overall emissivity when it is at this new temperature? (Assume the original coating is still on the receiver) c) At this instance in time during the night (when Gs =0 and the solar receiver has cooled to 600 K), what is the rate of change of the temperature of the receiver with respect to time (dTr/dt ) in K/s if the amount of electricity being produced by the receiver does not change.
A black body of 0.2 m^2 area has an effective temperature of 800K. Calculate a). The total rate of energy emission . b). The intensity of normal radiation and c). The intensity of radiation along a direction 60° to the normal.
Two 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?
Two flat 1m x 2m panels are spaced 3m apart. The top panel is exposed to the sun and is currently 200oC. The bottom panel is not exposed to the sun. The panels have an emissivity of 0.3. a) If the bottom panel is absorbing 200W of thermal radiation, what is the temperature of the bottom panel? b) If the bottom panel is chilled to −60oC, how much radiation does it absorb?
QUESTION 9 A manufacturing factory located at 30° N latitude has a window area 35 m² that consists of double- pane windows made of clear glass (SHGC = 0.766) as given in the Figure Q2. To reduce the solar heat gain on a hot day, a reflective film that reduce the SGHC to 0.261 is considered. The building need cooling during the months of June, July, August and September and need heating during the months of October through April. The average daily solar heat fluxes incident on the west side of this latitude is given in the Table Q2 below. The unit cost of electricity and the natural gas are RM 0.30/kWh and RM1.75/therm, respectively. If the coefficient of performance of the cooling system is 3.0 and the efficiency of the furnace is 0.80. Determine: i. the net annual cost savings due to installing reflective coating on the windows ii. the simple payback period if the installation cost of the reflective film is RM 70/m² Glass Solar Radiation Reflective film KAir space Reflected…
23 Question No. 7 The distance between a real object and its image in a convex mirror of focal length 12 cm is 32cm. Find the size of image if the object size is 1 cm 1. cm
Given the following scene on the stage Player #1 Player #3 Diameter 1meter Diameter 2meters Player #2 High 2m Width 1m All spotlights are place at 15 meters from the stage. You want to produce a circle of light of 2meters diameter with the SPOTLIGHT#1 on the Player #1, a rectangle of light of 2m by Im with the SPOTLIGHT #2 on the Player #2 and a circle of light of Imeter diameter with the SPOTLIGHT#3 on the Player #3
Earth absorbs only a fraction of incident sun energy. Can we consider it as blackbody according to the given information? A) Yes B) it depends on complexity of the problem C) Not sufficient information D) No
Q2:- Light from the sun arrives at the earth, an average of 1.48 x 101' m away, at the rate of 1.4 kW/m2 of area perpendicular to the direction of the light. Assume that sunlight is monochromatic with a frequency of 4.95 x 1014 Hz. (a) How many photons fall per second on each square meter of the earths surface directly facing the sun? (b) What is the power output of the sun, and how many photons per second does it emit?
ueveiopeu vaiue. 1.5) Fill in the blanks: A body whose surface properties are independent of is . The emissivity of a wavelength is said to be a one for all wavelengths, the emissivity of a is between zero and one.