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CAVITY SOLAR RECEIVER FOR PARABOLIC DISK COLLECTOR
P202130067
The object of the present invention consists of a new cavity solar receiver for a parabolic dish collector that makes it possible to heat the heat-carrying fluid to high temperatures, without causing the degradation of said heat-carrying fluid and avoiding overheating of the cavity solar receiver itself or from some region of it. This absorber located at the focal point of the parabola captures the solar radiation reflected from the collector. A heat-carrying fluid enters through the hottest part of the receiver and runs through the receiver along a spiral-shaped circuit made inside it. The fluid eventually leaves the receiver at a considerably higher temperature and is led to a boiler heat exchanger to generate steam. The spiral circuit forces the fluid to circulate at a constant speed throughout its entire length, avoiding areas of stagnation of the fluid that would cause hot spots where gases can be generated by evaporation of the fluid. These gases could cause water hammer inside the receiver and through the installation pipes and put their mechanical integrity at risk.
The cylindrical receiver with a cavity for a parabolic disk collector described in this preferred embodiment has a very small added pressure drop in the pressure of the heat transfer fluid circuit; throughout the path of the heat transfer fluid through the circuit, there is no area, nook, or corner where stagnation or loss of speed may occur and, therefore, there are no hot spots inside the body of the receiver that may generate gases of the heat transfer fluid by evaporation and, in addition, the energy efficiency of the developed cavity solar receiver is improved. For all these reasons, the present invention solves the technical problems presented by current cavity receivers, represents an advantage over the receivers described to date and represents an advance in the state of the art in this field.