Patent ID: 7263992

Claim:
A volumetric solar receiver comprising: a heat absorbing cavity; a glass window on the heat absorbing cavity to receive incoming sunlight; and a working fluid inlet pipe and working fluid outlet pipe connected to the heat absorbing cavity, wherein the glass window comprises a double-layer hollow glass, a hollow portion of the double-layer hollow glass forms an inner cavity which is provided with an outlet connecting to the heat absorbing cavity, and the working fluid inlet pipe is connected with the inner cavity and further with the heat absorbing cavity via the outlet of the inner cavity, wherein the heat absorbing cavity is covered externally with an insulation layer and a preheating passage is provided in the insulation layer, the preheating passage is connected at one end to the outlet of the inner cavity of the double-layer hollow glass via a flow collecting pipe, and at the other end to the heat absorbing cavity via a secondary inlet pipe.