Energy and Environment II

QUIZ #1

Friday, January 18, 2002

Closed Books and Notes

25 points

Answers in red.

The following numbers have special meaning in this course – they have been discussed during the first two weeks of the course.

IN WORDS briefly define each number. For example, if I gave you "2002", you would write "the present year".

342 w/m2 = solar energy flux at the edge of earth’s atmosphere, normal to the ground, averaged over all locations, averaged over all times of the year.

173,000 TW = total solar power intercepted by the earth, average value for the year.

71 degrees (angle) = solar incidence angle for Seattle for solar noon at winter solstice.

24 degrees (angle) = solar incidence angle for Seattle for solar noon at summer solstice.

1367 w/m2 = solar constant.

23.5 degrees (angle) = maximum declination angle (summer solstice). Also, the latitude of the Tropic of Cancer.