Linear solar energy collector system and solar power generator system

Abstract

A linear solar energy collector system includes reflective lines arranged in parallel in a south-north direction, heliostats mounted on the reflective lines, respectively, each comprised of mirror segments to reflect solar radiation, a light receiving line set above the reflective lines in a east-west direction, a receiver mounted on the light receiving line, to receive light reflected from the heliostats and collect heat from the light, and an angular adjuster to adjust angles of the mirror segments individually to irradiate a same light receiving area on the receiver with the reflected light from east-west neighboring reflective lines and thereby adjust a concentration ratio.

1 . A linear solar energy collector system, comprising:
 reflective lines arranged in parallel in a south-north direction;   heliostats mounted on the reflective lines, respectively, each comprised of mirror segments to reflect solar radiation;   a light receiving line set above the reflective lines in an east-west direction;   a receiver mounted on the light receiving line, to receive light reflected from the heliostats and collect heat from the light; and   an angular adjuster to adjust angles of the mirror segments individually to irradiate a same light receiving area on the receiver with the reflected light from east-west neighboring reflective lines and thereby adjust a concentration ratio.   
     
     
         2 . A linear solar energy collector system according to  claim 1 , wherein:
 the receiver includes a heat collecting pipe filled with a heat medium as a fluid; and   the heat collecting pipe is segmented into an irradiation area irradiated with the reflected light from the mirror segments and a non-irradiation area arranged at both ends of the irradiation area.   
     
     
         3 . A linear solar energy collector system according to  claim 2 , wherein
 the irradiation area is configured to transfer heat to the non-irradiation area when heated with the reflected light and cause a heat transfer in the fluid inside the heat collecting pipe.   
     
     
         4 . A linear solar energy collector system according to  claim 1 , wherein
 the angular adjuster is configured to adjust south-north and east-west rotation angles of the mirror segments.   
     
     
         5 . A linear solar energy collector system according to  claim 1 , wherein
 the mirror segments each include a curved reflective surface.   
     
     
         6 . A linear solar energy collector system according to  claim 4 , wherein
 the angular adjuster is configured to adjust the east-west rotation angles commonly and adjust the south-north rotation angles individually.   
     
     
         7 . A linear solar energy collector system according to  claim 1 , wherein
 each of the mirror segments is a standard module having a south-north length twice as long as an east-west length; and   two groups of mirror segments arranged in tandem are disposed to face each other on the reflective lines, placing the light receiving line in-between.   
     
     
         8 . A linear solar energy collector system according to  claim 1 , wherein
 a south-north spacing of the mirror segments is set to reduce an optical loss between south-north neighboring mirror segments due to blocking or shadowing, such that the further from the light receiving line the mirror segments are, the wider the spacing is.   
     
     
         9 . A linear solar energy collector system according to  claim 1 , wherein:
 when the linear solar energy collector system is installed in the northern hemisphere, a north-side length of the reflective lines from the light receiving line is set to be longer than a south-side length; and   when the linear solar energy collector system is installed in the southern hemisphere, the south-side length of the reflective lines from the light receiving line is set to be longer than the north-side length.   
     
     
         10 . A linear solar energy collector system according to  claim 1 , wherein:
 the receiver includes a heat collecting pipe filled with a heat medium, arranged above all the heliostats, and connected at one end to a heat source; and   the heat collecting pipe is configured to receive the reflected light from the heliostats and collect heat from a heated heat medium.   
     
     
         11 . A linear solar energy collector system according to  claim 1 , wherein:
 the receiver includes heat collecting pipes arranged in parallel, is covered with a thermal insulated wall above the heat collecting pipes, and includes an endothermic net below the heat collecting pipes, having a cavity window function;   the thermal insulated wall is a cover with an arc-like cross section to enclose the heat collecting pipes and has both ends projecting downward from edges of the endothermic net; and   the endothermic net is a stainless mesh with a well curb or a honey comb structure of a certain thickness, to allow the reflected light from the heliostats to transmit through the mesh to inside but not to allow an irradiation of the reflected light to travel outside from the mesh.   
     
     
         12 . A linear solar energy collector system according to  claim 1 , wherein
 the receiver includes a compound parabolic concentrator to reflect the reflected light from the mirror segments to the heat collecting pipe.   
     
     
         13 . A solar power generator system, comprising:
 a backup heater using the linear solar energy collector system according to the  claim 1  to heat the fluid up to a first temperature lower than an intended temperature; and   a main heater using another type solar energy collector system more suitable for high-temperature energy concentration than the linear solar energy collector system, to increase the temperature of the fluid up to a second temperature as the intended temperature.