Sustainable Energy, SI Edition
2nd Edition
ISBN: 9781337672092
Author: DUNLAP, Richard A.
Publisher: Cengage Learning
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Students have asked these similar questions
In the solar energy budget shown;
B
D
Cloud
A
Atmosphere
F
H
E
Land
Sea
How much in percent is the albedo for combined sea and cloud?
A=19
B=5
C=10
D=3
E=40
F=6
G=10
H=7
A home is heated with propane with a
100,000 BTU furnace size and 95%
efficiency. The monthly heating degree
days is 5000. Using the energy estimation
discussed in this chapter, estimate the
monthly and annual gas consumption to
heat the building if the home is to be kept
68°F.
The annual average insolation for a fixed solar panel in
city A is 350 W/m2. On the other hand, city B has a figure
of 300 W/m?. For both locations, the solar panel has the
capability to convert 17% of the incident energy into
electricity. Average annual electricity in City A is 13 000
kWh with an average cost of $0.4/kWh, while in city B, it
is 10 000 kWh at a cost of $0.75/kWh.
For City A,
a. Determine the area of the solar panel needed in order
to suffice the average electrical needs of a residence.
b. Determine the area of the solar panel needed in order
to suffice the average electrical needs of a residence in
City B.
c. Determine the price per square meter of solar panel in
City A if the device has a lifetime of 20 years. Assume
that the electricity costs are constant throughout the
period.
d. Determine the price per square meter of solar panel in
City B if the device has a lifetime of 20 years. Assume
that the electricity costs are constant throughout the
period.
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- On a summer day, the mean solar irradiance received at a lake was 500 W/m^ 2 over 25 days (consider the day length to be 8 hours). If 80% of the energy is used to vaporize water, how large could the depth of evaporation be?arrow_forwardFor a building located in Madrid, Spain with annual heating degree-days (dd) of 4654, a heating load (heat loss) of 30,000 kj/h, and a design temperature difference of 30° C (20° C indoor), estimate the annual energy consumption. If the building is heated with a furnace with an efficiency of 92%, how muchgas is burned to keep the home at 20° C? State your assumptions.arrow_forwardIn a refrigeration cycle that is used to cool products of a grocery store has an efficiency of 46 %. The total heat load of the grocery store in weekdays is 50 kW while in weekends is 100 kW. If the system uses electricity that could power the store within the whole month. What will be its consumption for a month? * 1304 Kw O 1.30 Kw 600 kW O 150 Kwarrow_forward
- Water falls from a height of 500 m and the mass of water is 50 kg. What is approximately the rise in temperature of water at the bottom if the whole energy is used to heat the water? Specific heat of water is 4.18 kJ/kg-deg C. O 5000 deg C O 1173 deg C O 500 deg C O 0.23 deg C O none of the abovearrow_forwardchoose the correct answerarrow_forwardA 2 x 2 m flat plate solar collector for domestic hot water heating is shown in the figure. The incident solar radiation on the glass cover, which transmits 90% of the incident flux, is 750 W/m2. Water flows through the tubes soldered to the backside of the absorber plate, entering at a temperature of 25°C. The temperature of the glass cover is 27°C, and it radiates heat with an emissivity of 0.92 to the sky at –50°C. Additionally, the glass cover losses heat by convection to air at 20°C flowing over its surface at 30 km/h. Assume that the radiation heat transfer between the absorber plate and glass cover and the heat transfer through the back and sides of the collector is negligible.arrow_forward
- Assume 40% of the light emitted by a 1000 W metal halide lamp (110,000 lm) illuminates a surface with the area of a 32-ft diameter. 1. Determine the average illuminance of the surface in foot candles. 2. Determine the average illuminance of the surface in lux.arrow_forwardTake a 4,000 G.S.F. home from 8290 CFH to 1409 CFH in a climate with 4246 HDD. What are the savings? Give your answer in Btus of heating energyarrow_forwardA wooden shelter has walls constructed of wooden planks 1.00 cm thick. If the exterior temperature is -20.0°C and the interior is 5.00°C, find the rate of energy loss through a wall that has dimensions 1.95 m by 2.30 m.arrow_forward
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