The average solar power striking the earth’s outer atmosphere is 173,000 TW (where TW = terawatt = 1012 watts). Using your knowledge of the sun’s diameter and average surface temperature, the distance from the sun to the earth, and the diameter of the earth, confirm the 173,000 TW value. Clearly show your calculation (note that sloppy, poorly organized calculations will not be graded). Not considering changes in the sun, by how much does the solar power striking the earth change over the year? When is it greatest, and when is it the least?
The average primary power consumption by humankind is 13 TW. Calculate the annual primary energy consumption by humankind as EJ (where EJ = exajoule = 1018 joules). Also calculate the number of hours of solar power striking the earth required to equal the total annual primary energy consumption of humankind. According to the text, what are the main primary energies used by humankind? Do any of these meet our definition of renewable? If yes, which ones?
Based on Lecture 2, how many TWs of long wave radiation (also termed infrared or thermal radiation) must leave the earth (and its atmosphere) for space.
Which of the renewable energies discussed on pages 29-31 of the text are derived from sunlight, and which are not. For each of those not derived from the sun, what is the source of the energy.
Which of the following do you believe is most important for the development of renewable energy? Pick only one, and then discuss your choice, providing rationale for your choice. Your discussion must be typed (two pages double spaced maximum). Your grade on this question will be based on the strength and clarity of your discussion – not on the choice picked.