An evacuated flat plate collector has been built and tested in
a solar simulator. A vacuum of <0.1 Pa was used to eliminate
heat losses through convection and gas conduction.
CFD and stress calculations for the hydro-formed panels
determined the material thickness and through-hole sizes. The
simulator used a reflecting tube to generate uniform illumination
via multiple virtual images of four halogen floodlights. Tests
with and without vacuum over a range of illumination powers
demonstrate the efficiency benefits of vacuum insulation when
providing heat at elevated temperatures or with weak insolation.
papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.