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8
SOLAR THERMAL COLLECTORS
ANSWERS TO TEXTBOOK QUESTIONS AND EXERCISES
1. The coating on the upper surface of an absorber plate should have as low an emissivity as
2. The bond between the absorber sheet and the fluid-carrying tubes should maximize the
7. An advantage of a single glass envelope evacuated tube is that it minimizes optical losses
8. The function of the barium getter is to absorb any remaining gas molecules within the
9. b, a, c
13. decreases, decreases
17. (a) K = 1 for incident angle = 0°. Instantaneous thermal efficiency is 63.8 percent.
18. See chart:
0
0.2
0.4
0.6
0.8
1
020 40 60 80
Incident angle modifier
