TY - JOUR
T1 - Optimized secondary concentrators for a partitioned central receiver system
AU - Timinger, A.
AU - Spirkl, W.
AU - Kribus, A.
AU - Ries, H.
N1 - Funding Information:
This research was supported by a grant from the German Federal Ministry of Education, Science, Research and Technology (BMBF) and the Israeli Ministry of Science (MOS) under the aegis of KFA-BEO — Forschungszentrum Jülich GmbH/Projektträger für Biologie, Energie und Ökologie.
PY - 2000
Y1 - 2000
N2 - We present secondary concentrators with non-regular shapes for increasing the concentration of radiation from a given field of heliostats, well suited for partitioning the receiver into several units, arranged side by side. For a general heliostat field with a non-axisymmetric directional distribution of the radiation at the entrance aperture of the secondary concentrator, concentrators with non-regular shape can significantly increase the concentration as compared to their symmetric analogs. Our optimizations indicate best results for concentrators based on rectangular entrance and exit apertures. The concentration may be increased by a factor of 2.3 at an optical efficiency of 90%. If the shape of the exit aperture is required to be close to circular, concentrators based on non-regular hexagonal apertures may reach concentration higher than their symmetric analogs by a factor of 1.3. For the given radiation, concentrators with polygonal apertures perform significantly better than concentrators with smooth elliptic apertures.
AB - We present secondary concentrators with non-regular shapes for increasing the concentration of radiation from a given field of heliostats, well suited for partitioning the receiver into several units, arranged side by side. For a general heliostat field with a non-axisymmetric directional distribution of the radiation at the entrance aperture of the secondary concentrator, concentrators with non-regular shape can significantly increase the concentration as compared to their symmetric analogs. Our optimizations indicate best results for concentrators based on rectangular entrance and exit apertures. The concentration may be increased by a factor of 2.3 at an optical efficiency of 90%. If the shape of the exit aperture is required to be close to circular, concentrators based on non-regular hexagonal apertures may reach concentration higher than their symmetric analogs by a factor of 1.3. For the given radiation, concentrators with polygonal apertures perform significantly better than concentrators with smooth elliptic apertures.
UR - http://www.scopus.com/inward/record.url?scp=0033717724&partnerID=8YFLogxK
U2 - 10.1016/S0038-092X(00)00047-5
DO - 10.1016/S0038-092X(00)00047-5
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AN - SCOPUS:0033717724
SN - 0038-092X
VL - 69
SP - 153
EP - 162
JO - Solar Energy
JF - Solar Energy
IS - 2
ER -
