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TROUGHS (848 words) |
 | A trough captures sunlight over a large aperture area and concentrates this energy onto a much small receiver area, multiplying the intensity of the sun by a concentration ratio in the range of 30-80. |
| The receiver of a trough concentrator is typically a metal absorber surrounded by a glass tube. |
| Troughs are aimed at commercial and industrial markets, but they can be configured in any reasonable collector area to meet the desired load. |
| Radiant energy collection - Patent 4003638 (5620 words) |
| The concentrative capability of the collector, i.e., the ratio of exit aperture transverse dimension d.sub.2 to entrance aperture transverse dimension d.sub.1, is equal to the sine of the half field of view (.theta.) of the trough. |
| The maximum angle of acceptance (critical angle) for trough 25 would be equal to the inverse sine of the index of refraction of the medium filling trough 21 divided by the index of refraction of the medium filling trough 26, i.e. |
| With respect to trough 21, since the exit aperture 23 transverse dimension is equal to 1.5 inches and the desired maximum angle of acceptance is equal to 16.degree., the transverse dimension, d.sub.1, of the entrance aperture 22 would be 5.4 inches and the overall height would be 12 inches. |
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