What is the basis for the efficiency of a PV module?
What will be an ideal response?
The efficiency of a PV module is based upon how well the incoming solar power is converted to usable electrical power.
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President Jefferson's embargo failed for all of the following reasons EXCEPT that
A. he underestimated the determination of the British. B. he underestimated Britain's dependence on American trade. C. he overestimated the dependence of Britain and France on America's trade. D. Latin American republics opened up their ports for commerce. E. he miscalculated the difficulty of enforcing it.
It is believed that ____________________ was used as the main source of energy for thousands of years before other sources were developed
Fill in the blank(s) with correct word
Understanding force enables masons to have a working knowledge of valuable, sometimes life-saving information.
Answer the following statement true (T) or false (F)
The air resistance to motion of a vehicle is something important that engineers investigate. The drag force acting on a car is determined experimentally by placing the car in a wind tunnel. The air speed inside the tunnel is changed, and the drag force acting on the car is measured. For a given car, the experimental data is generally represented by a single coefficient that is called drag coefficient. It is defined by the following relationship:
The frontal area A represents the frontal projection of the car's area and could be approximated simply by multiplying 0.85 times the width and the height of a rectangle that outlines the front of a car. This is the area that you see when you view the car from a direction normal to the front grill. The 0.85 factor is used to adjust for rounded corners, open space below the bumper, and so on. To give you some idea, typical drag coefficient values for sports cars are between 0.27 to 0.38 and for sedans are between 0.34 to 0.5.
The power requirement to overcome air resistance is computed by
where
P = Power (Watts or ft.lb/sec)
1 horse power (hp) = 550 ft.lb/sec
and
1 horse power (hp) = 746 Watts
The purpose of this exercise is to see how the power requirement changes with the
car speed and the air temperature. Determine the power requirement to overcome the air resistance for a car that has a listed drag coefficient of 0.4 and width of 74.4 inches and height of 57.4 inches. Vary the air speed in the range of 15 m/s < V < 35 m/s, and change the air density range of 1.11 kg/m^3 < p <1.29 kg/m^3. The given air density range corresponds to 0ºC to 45ºC. You may use the ideal gas law to relate the density of the air to its temperature. Present your findings in both kilowatts and horsepower. Discuss your findings in terms of power consumption as a function of speed and air temperature.