The invention relates to a method for producing syngas by means of solar radiation, in which the reactor of a receiver-reactor is periodically heated via an aperture provided in the same for solar radiation by means of the solar radiation to an upper reduction temperature for a reduction process and subsequently cooled to a lower oxidation temperature for an oxidation process in the presence of an oxidation gas, wherein the sunlight is guided through an absorption chamber onto an absorber configured as a reactor, which includes a reducible/oxidizable material, and wherein a gas that absorbs the black-body radiation of the absorber is guided through the absorption chamber and the absorption chamber is configured so that the back radiation of the absorber through the aperture is essentially absorbed by the gas. Radiation losses caused by back radiation of the black-body radiation exiting the optical aperture are thus avoided in accordance with the invention. The heat of the back radiation, however, can be utilized directly in the heat-transporting fluid and is available for a flexible usage. The receiver-reactor has a simple design and is suitable as a low-cost receiver-reactor.

The invention provides in some aspects a thermal energy collection system comprising a first solar collector through which a first heat transfer fluid flows to absorb energy from sunlight as it passes through the first solar collector, and a second solar collector that collects energy from sunlight that has passed through the first solar collector. The first heat transfer fluid of the thermal energy collection system according to these aspects of the invention is in thermal coupling with the first solar collector, but not with the second solar collector. In other aspects, the invention provides a radiator system, comprising a multi-wall panel, an interior of which is in fluid coupling with, and that forms part of, a fluid circuit through which a first heat transfer fluid flows. A reflective surface is disposed in a vicinity of a second face of the multi-wall panel. Still other aspects of the invention provide a reflective film solar energy collector and a solar energy absorber.

A device is disclosed for the storage and transfer of solar thermal energy which includes a casing having a irradiation opening for the entry of incident solar radiation in a irradiation region of the casing. a bed of fluidizable solid particles received within the casing, and a plurality of reflecting and radiating surfaces arranged within the irradiation region and configured to convey the solar radiation entering through the irradiation opening, after multiple reflections, on the bed of particles.

A hybrid solar panel including at least one single-piece section resulting from extrusion, the section including a wall forming the aforementioned bottom and top faces of the heat exchanger, and the section includes: a plurality of longitudinal fins extending substantially perpendicularly from the bottom face of the heat exchanger or from the aforementioned wall, andat least one portion of the circulation pipe directly connected to the bottom face of the heat exchanger or to the aforementioned wall, the portion of the circulation pipe extending substantially parallel to the longitudinal fins.