| 摘要 |
A radiation collector (10) comprises a plurality of conduit sections (17) which are connected or connectible to form at least part of a continuous conduit for the passage therethrough of a heat collecting fluid, a plurality of substantially parallel cylindrical-form lenses (15) (which may be Fresnel lenses) disposed on one side of the conduit sections (17) and substantially parallel thereto, and a plurality of substantially parallel concave reflectors (16) disposed on the other side of the conduit sections (17) and substantially parallel thereto, the concave reflectors (16) facing towards the conduit sections (17) and lenses (15) and the arrangement of the lenses, conduit sections and reflectors being such that for at least some angles of incidence of radiation on the lenses, the incident radiation is concentrated on the exterior surface of the conduit sections (17) directly from the lenses (15) and/or indirectly after reflection from the reflectors (16). In some embodiments, all the conduit sections (17) have their axes in a common plane and all the reflectors (16) have equal concavity. These embodiments may be disposed with the conduit sections (17) in an East-West direction for receiving solar energy over a relatively long period of daylight. In other embodiments best suited to be mounted with their conduit sections in a North-South direction, alternate conduit sections (17a, 17b) have their axes in different respective planes and corresponding reflectors (16a, 16b) have appropriate curvatures. These other embodiments can receive radiation over longer daylight periods, but not all conduits will receive concentrated radiation at all times. The principal advantage of the radiation collector is that it will collect radiation efficiently over a relatively wide range of incident angles without the need for mechanical apparatus to vary the attitude of the collector or to vary the relative positions of the lenses, conduit sections and reflectors.
|
