Permiso concedido para subir el documentoThe Standard ISO 9459-2 is a standard for the characterization of thermal performance of domestic water
heating systems without auxiliary heating. In this study, 18 domestic water heating thermosiphon systems
have been tested according to this international standard. The objective of the paper is to carry out a
comparative analysis of the results obtained in these systems as a function of their volume and type of heat
exchanger (tubular and double jacket). A comparative analysis of systems performance will be carried out by
calculating the performance without thermal loss (a1/A) and solar fraction fSOL in different reference locations
for different volume/area ratios. Also, a comparative analysis of systems performance and solar fraction will
be carried out at different locations between a tubular heat exchanger tank and a double jacket heat
exchanger tank. The different values obtained will be compared for the storage tank’s heat loss coefficient
(Us). It will determinate the useful energy (energy with temperature above 45ºC) for the degree of mixing in
the storage tank during a draw-off test
