Abstract
A mathematical condition is derived which determines the times at which acceptance of the sun's beam radiation begins and ceases for a trough-type concentrator having arbitrary orientation. The concentrator considered is a two-dimensional ideal concentrator which has a definite range of acceptance angles. Sample calculations are performed which investigate the period of acceptance of a 1.8X concentrator. For year-round optimal collection a south-facing 1.8X concentrator should be oriented with axis horizontal and with slope equal to the latitude. If the concentrator faces slightly away from south, however, a horizontal axis and a slope equal to latitude will result in severely reduced collection times near a solstice.
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