Sunlight collecting heat receiver
A sunlight collecting heat receiver includes: a heat-exchange heat receiving tube which receives sunlight collected by heliostats and transfers the sunlight to a heat carrier, wherein the heat-exchange heat receiving tube includes an outward-flow heat receiving tube which is disposed on the upstream in a sunlight incident direction and an inward-flow heat receiving tube which is connected to the outward-flow heat receiving tube through a U tube and is disposed on the downstream in the sunlight incident direction, and wherein the outward-flow heat receiving tube and the inward-flow heat receiving tube are arranged so as to be deviated from each other in the transverse direction perpendicular to the height direction when seen in the sunlight incident direction.
1. A sunlight collecting heat receiver comprising:
a heat-exchange heat receiving tube which receives sunlight collected by heliostats and transfers heat to a heat carrier,
wherein the heat-exchange heat receiving tube includes an outward-flow heat receiving tube which is disposed on the upstream in a sunlight incident direction and an inward-flow heat receiving tube which is disposed on the downstream in the sunlight incident direction,
wherein a single U tube which connects an outlet of the outward-flow heat receiving tube and an inlet of the inward-flow heat receiving tube,
wherein a plurality of heat-exchange heat receiving tubes is provided so that the outward-flow heat receiving tubes and the inward-flow heat receiving tubes are deviated from each other in a direction perpendicular to the height direction when seen in the sunlight incident direction, and
wherein a reflection minor which reflects the sunlight passing through gaps between the outward-flow heat receiving tubes and the inward-flow heat receiving tubes so that the reflected light illuminate rear surfaces of the outward-flow heat receiving tubes and the inward-flow heat receiving tubes is further provided on the downstream in the sunlight incident direction of the inward-flow heat receiving tubes.
2. The sunlight collecting heat receiver according to claim 1 , wherein a reflection surface of the reflection minor is provided with reflectors which have different reflection angles with respect to incident angles of the sunlight passing through gaps between the outward-flow heat receiving tubes and the inward-flow heat receiving tubes so as to prevent reflected light of the reflection minor from returning to the upstream in the sunlight incident direction, and to make the reflected light illuminate the rear surfaces of the outward-flow heat receiving tubes and the inward-flow heat receiving tubes.
3. The sunlight collecting heat receiver according to claim 1 ,
wherein a heat receiving tube body is formed by one group of the heat-exchange heat receiving tubes in which at least one heat-exchange heat receiving tube is disposed so as to pass over the other heat-exchange heat receiving tubes.
4. The sunlight collecting heat receiver according to claim 3 ,
wherein the heat receiving tube body is formed by one group of the three heat-exchange heat receiving tubes in which two heat-exchange heat receiving tubes are disposed in parallel to each other, and one heat-exchange heat receiving tube is disposed so as to pass over the two heat-exchange heat receiving tubes disposed in parallel to each other.
5. The sunlight collecting heat receiver according to claim 4 , wherein a plurality of the heat-exchange heat receiving tubes is arranged so that a gap between the outward-flow heat receiving tubes, a gap between the inward-flow heat receiving tubes, a gap between the outward-flow heat receiving tube and the inward-flow heat receiving tube, and a gap between the inward-flow heat receiving tube and a reflection mirror are equal to each other.