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<small>'''Abstract''' - The use of diffuse and specular flat reflectors to enhance the performance of flat-plate solar collectors has been explored by means of Fortran routines which optimize the size, shape, and placement of reflector and collector. Configuration factors for systems with a diffuse reflector and a collector whose absorptance varies with incidence angle are presented. Specular reflectors are more effective than diffuse reflectors, and, if south-facing, should be used with collectors which are elongated in the east-west direction. Design curves for the specific system of horizontal collector and south-facing reflector are presented. In this system, a moderately sized reflector can increase the midwinter yield per unit collector area by several times.</small>
<small>'''Abstract''' - The use of diffuse and specular flat reflectors to enhance the performance of flat-plate solar collectors has been explored by means of Fortran routines which optimize the size, shape, and placement of reflector and collector. Configuration factors for systems with a diffuse reflector and a collector whose absorptance varies with incidence angle are presented. Specular reflectors are more effective than diffuse reflectors, and, if south-facing, should be used with collectors which are elongated in the east-west direction. Design curves for the specific system of horizontal collector and south-facing reflector are presented. In this system, a moderately sized reflector can increase the midwinter yield per unit collector area by several times.</small>


* model for horizontal collector with top-reflector(south facing)
*
* diffuse and specular reflectors
* specular more effective


=== [http://www.sciencedirect.com/science/article/pii/0038092X77900275 The use of planar reflectors for increasing the energy yield of flat-plate collectors - 1977]<ref>Grassie, S. & Sheridan, N. 1977 'The use of planar reflectors for increasing the energy yield of flat-plate collectors', ''Solar Energy'', vol. 19, Issue 6, pp. 663-668, ISSN 0038-092X, http://dx.doi.org/10.1016/0038-092X(77)90027-5.</ref> ===
=== [http://www.sciencedirect.com/science/article/pii/0038092X77900275 The use of planar reflectors for increasing the energy yield of flat-plate collectors - 1977]<ref>Grassie, S. & Sheridan, N. 1977 'The use of planar reflectors for increasing the energy yield of flat-plate collectors', ''Solar Energy'', vol. 19, Issue 6, pp. 663-668, ISSN 0038-092X, http://dx.doi.org/10.1016/0038-092X(77)90027-5.</ref> ===
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