Multi-thermal storage unit systems, fluid flow control devices, and low pressure solar receivers for solar power systems, and related components and uses thereof

A solar receiver comprising:

• a fluid chamber configured for operating at a pressure between 0.9 atmospheres and 1.25 atmospheres absolute pressure, comprising a fluid inlet, a fluid outlet, and an opening for receiving concentrated solar radiation;
• a solar absorber housed within the fluid chamber;
• and
• a plurality of transparent objects that define a segmented wall of the fluid chamber, wherein the plurality of transparent objects are in the form of separate panels arranged adjacent to each other to collectively form the segmented wall, wherein the segmented wall defines at least a portion of an outermost wall of the fluid chamber, wherein the outermost wall is in contact with an environment surrounding the solar receiver, and wherein the segmented wall is configured with gaps between the transparent objects that allow for a fluid surrounding the solar receiver to pass at ambient pressure through the segmented wall and into the fluid chamber when a pressure within the fluid chamber is lower that an environmental pressure surrounding the solar receiver during operation;
• wherein concentrated solar radiation received through the opening passes through the segmented wall and between transparent objects to pass into the fluid chamber and impinges upon the solar absorber.