A solar combisystem provides both solar space heating and DHW from a common array of solar thermal collectors, usually backed up by an auxiliary non-solar heat source.
The size and complexity of combisystems, and the number of options available, mean that comparing design alternatives is not straightforward. Useful approximations of performance can be produced relatively easily, however accurate predictions remain difficult.
Hi Sofiane,
I would advise using the SAP document (link attached below). See page 74 (appendix H).
http://www.bre.co.uk/filelibrary/SAP/2012/SAP-2012_9-92.pdf
In Ireland we use something similar to SAP, it is called DEAP (dwelling energy assessment procedure) and is based on the same equations.
Hope this helps.
First, You need to calculate the energy requirements of your consumption system, after you must set the percentage contribution of each production system (solar collectors and the auxiliary).
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