In regards to fenestration (window) systems, calorimetry is defined as the solar radiation incident upon a glazing aperture to a well insulated testing chamber and the transfer of energy through this aperture. Solar calorimetric instrumentation has traditionally involved the measurement of heat exchange using water driven collectors. Standards have yet to be set for the exact apparatus and procedure on solar calorimetry for glazing systems. The accepted procedure for external testing is to expose the calorimeter to clear external conditions and constant solar position via solar tracking.
Mark B. Luther,
John J. Greenland,
"Simplified solar calorimetry for complex glazing systems", Proc. SPIE 3789, Solar Optical Materials XVI, (11 October 1999); doi: 10.1117/12.367573; https://doi.org/10.1117/12.367573