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Ground: Annex D of EN ISO 13370

Hello. In order to model in a
dynamic simulation software the heat transmission via the ground I tried to
apply in a worksheet ANNEX D ?Application to dynamic simulation programmes? of the
technical standard EN ISO 13370:2007 ?Thermal performance of buildings ? Heat transfer
via the ground?. I got results which I consider strange.

I attach two graphs. To obtain the
first one I used equation (A.3), for the second one I used equation (A.4).

The values are mean monthly
values. Ti,m is the internal temperature, Te,m is the external air temperature,
Tv,m is the ground temperature (under the slab, 0,5m ground ,and a ?virtual
layer?, whose thermal conductivity was calculated so that the thermal
transmittance is equal to thermal transmittance calculated with paragraph 9 of
that technical standard).

In my opinion, in winter season the
difference between internal temperature and ground temperature is too small.

Any opinion? Do you know any
alternative method?

If you are interested in having
more information about the method or about my calculation, let me know, please.

Best Regards

Francesco Passerini