초록 ▼

A solar receiver, particularly of the type for parabolic linear solar concentrators comprising a receiver tube, for the circulation of a heat transfer fluid, which is supported in a longitudinally adaptable manner in a shell that comprises a shielding body provided with a longitudinal slit, and at l

A solar receiver, particularly of the type for parabolic linear solar concentrators comprising a receiver tube, for the circulation of a heat transfer fluid, which is supported in a longitudinally adaptable manner in a shell that comprises a shielding body provided with a longitudinal slit, and at least one lens for closing the slit, which is permeable to the solar radiation that during use is reflected toward the receiver tube by a concentrator mirror, with which the shell is associated during use. Between the receiver tube and the shell an annular chamber is provided, which contains a preselected thermally insulating gas, at an operating pressure substantially comprised between 1 mbar and 31 mbar, the preselected gas having a thermal conductivity of substantially less than 0.01 W/mK at the operating temperature at the operating pressure.

대표청구항 ▼

1. A solar receiver, particularly of the type for parabolic linear solar concentrators and the like, comprising; a receiver tube configured to circulate a heat transfer fluid, said receiver tube being supported in a longitudinally adaptable manner in a shell, said shell comprising: a shielding body

1. A solar receiver, particularly of the type for parabolic linear solar concentrators and the like, comprising; a receiver tube configured to circulate a heat transfer fluid, said receiver tube being supported in a longitudinally adaptable manner in a shell, said shell comprising: a shielding body having a longitudinal slit, andat least one lens configured to close said slit, said lens being permeable to solar radiation reflected toward said receiver tube by a concentrator mirror, with which said shell is associated during use,an annular chamber located between said receiver tube and said shell, said annular chamber containing a preselected thermally insulating gas at an operating pressure substantially comprised between 1 mbar and 31 mbar, said preselected gas having a thermal conductivity of substantially less than 0.01 W/mK at the operating temperature at said operating pressure, wherein said annular chamber is not fluidly connected to said receiver tube, andat least one radiation shield interposed between said receiver tube and said shielding body of said shell,wherein said preselected thermally insulating gas is xenon or krypton. 2. The solar receiver according to claim 1, further comprising reflecting shields configured to reflect toward said receiver tube the radiation emitted thereby during use, said reflecting shields being provided at the sides of said slit inside said shell and extending from said shell substantially to said receiver tube, thereby defining a slot toward said receiver tube, said reflecting shields further defining a channel for direct radiation through said at least one lens toward said receiver tube. 3. The solar receiver according to claim 2, wherein said reflecting shields have a silver reflective coating. 4. The solar receiver according to claim 1, wherein a coating is provided on a face of said at least one lens, which is internal to said shell wherein said coating is permeable to radiation having a wavelength substantially comprised between 320 nm and 2000 nm, said coating simultaneously reflecting radiation having a wavelength substantially higher than 2000 nm. 5. The solar receiver according to claim 4, wherein said at least one lens has a shape that is adapted to correct the optical aberrations produced by the reflection of the concentrator minor that during use reflects solar radiation toward said receiver tube. 6. The solar receiver according to claim 4, wherein said at least one lens has a shape that is adapted to reduce the focal length of the radiation beam that during use is reflected by the concentrator mirror toward said receiver tube. 7. The solar receiver according to claim 4, wherein said at least one lens is prismatic and has a shape that is adapted to concentrate on said receiver tube the radiation beam that during use is reflected by the concentrator mirror toward said receiver tube. 8. The solar receiver according to claim 1, further comprising sliding blocks configured to support said receiver tube in said shell so as to allow longitudinal sliding and axial rotation. 9. The solar receiver according to claim 8, wherein said sliding blocks have at least one collar configured to support said at least one radiation shield, said at least one radiation shield being supported by said at least one collar so as to allow mutual sliding longitudinally to said at least one radiation shield.