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parameters from data TRNSYS. Appropriate provisions should therefore manually insert
using two input types, type 9a, the values of external temperature and solar radiation
taken directly from ASHRAE data and the Solar Tool.
5.2
Trnsys model
The Trnsys model used for the simulations is composed by different types, see Figure 42
below. The main Type is the Type 56, it contains all the parameters regarding the room
under consideration. It is created by the program part called Trnsys Build that is an
interface for creating and editing all of the non-geometry information required by the
TRNSYS Building Model; this is included in the software package. TRNBuild allows the
user extensive flexibility in editing wall and layer material properties, creating ventilation
and infiltration profiles, adding gains, defining radiant ceilings and floors, and positioning
occupants for comfort calculations. It consists of a graphical front-end (TRNSYS Simulation
Studio) to intuitively create a simulation; it is an interface for the detailed TRNSYS multizone building where it is possible to add different zones with the related parameters. In
this case only one zone was sufficient to simulate an environment similar to that created
with SST. It was built a single room of 25 m2 with an external south wall with a surface of
15 m2, three interior walls for a total surface of 45 m2 and an active surface that represents
the TABS system of 25 m2. In the south exposed wall has been a window of 3 m2 placed,
with identical parameters to those chosen in SST, as U-value and g-value. The same values
of infiltration have been set equal to 0.3 volumes per hour, and the same parameters for
internal gains, i.e.: two people with a activity degree of seated, light work (75 W as
Sensible Heat and 75 W as Latent Heat) and two computers with monitors (140 W each)
during office hours, from 8 to 18. All the other Regime Data have been deactivated. The
initial values for Trnsys have been set equal to the values calculated with the SST in order
to have the same operating conditions, as much as possible.
All the Types are connected with lines where the user can select the connection between
two different types, Figures 42 and 43.
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