Solar thermal receiver with concentric tube modules

Abstract

A solar thermal receiver with concentric tube modules is disclosed. The outer two tubes (101, 102) of each module form an annular gap (104) for the inlet flow (109) of a heat transfer fluid (HTF). A third inner tube (103) allows for the outlet flow (108) of the HTF. Each of the concentric tube modules is bottom-supported so as to allow for thermal expansion. Embodiments may include a structural element (750) to mitigate oscillation of the concentric tube modules and / or a top-mounted bell-shaped cap (534).

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims priority to and the benefit of U.S. Provisional Patent Application Ser. No. 61 / 406,384, filed Oct. 25, 2010, which is hereby incorporated herein by reference in its entirety for all purposes.TECHNICAL FIELD[0002]Embodiments pertain to solar thermal receivers with concentric tube modules for converting concentrated sunlight into heat.BACKGROUND ART[0003]Solar-Thermal Receivers convert concentrated sunlight, e.g., as coming from a heliostat field, into heat and are cooled by a heat transfer fluid (HTF) such as molten salt, oil, or water. In the prior art one example includes, a receiver having one or more panels of parallel absorber tubes. Fluid flow through said panels may be parallel or in an alternate / serpentine fashion. This may result in an additional part count, e.g., valves, manifolds; complex drainage procedures; added costs; and a significant pressure drop within the receiver.DISCLOSURE OF INVENTION[0004]Emb...

AI Technical Summary

Benefits of technology

This patent describes a new design for a solar thermal receiver that allows for fewer tubes, increased flow of solvent, better heat transfer, and reduced pressure drop while maintaining good receiver characteristics. This design also allows for thermal deflection and the addition of more tube modules while keeping the receiver the same weight. By using a reduced number of supports, the design creates a lighter solar thermal receiver that may also reduce tower costs. Additionally, the design allows for efficient shipping and easier assembly of the receiver.

Problems solved by technology

This may result in an additional part count, e.g., valves, manifolds; complex drainage procedures; added costs; and a significant pressure drop within the receiver.

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