.IDEAS.BoundaryConditions.SimInfoManager .IDEAS.BoundaryConditions.SimInfoManagerThe SimInfoManager manages all simulation information. It loads TMY3 weather data files and applies transformations for computing the solar irradiance on the zone surfaces.
filNam and filDir can be used to set the path to the TMY3 weather file.
This file should include the latitude, longitude and time zone corresponding to the weather file.
See the included weather files for the correct format.
incAndAziInBus.
incAndAziInBus determines for which inclination and azimuth the solar radiation is pre-computed.
computeConservationOfEnergy=true.
Conservation of energy is checked by computing the internal energy for
all components that are within "the system" and by adding to this the
integral of all heat flows entering/leaving the system.
There are two options for choosing the extent of the system based
on parameter openSystemConservationOfEnergy.
Either conservation of energy for a closed system is computed,
or it is computed for an open system. Buildings package.
I.e. all heat flows at embedded ports port_emb of walls,
fluid ports of the zones, zone.gainCon and zone.gainRad are
considered to be a heat gain to the system and every other component
is considered to be outside of the system for which conservation of energy is checked. openSystemConservationOfEnergy=true
these heat flow rates are not taken into account because they are assumed
to flow between components that are both within the bounds of the system.
The user then needs to choose how large the system is and he should make sure that
all heat flow rates entering the system are added to sim.Qgai.Q_flow and
that all internal energy of the system is added to sim.E.E.
IDEAS supports several levels of detail for simulating interzonal airflow and air infiltration,
which can be selected by setting the value of the parameter interzonalAirFlowType.
By default, interzonalAirFlowType = None and a fixed n50 value is assumed for each zone.
The corresponding fixed mass flow rate is pushed
into (with ambient properties) and extracted from each zone model.
In practice, air infiltration however depends on the wind pressure
and occurs only for zones that have an exterior/outer wall
or windows.
The other interzonalAirFlowType options model this effect in more detail.
By default, the OuterWall and Window leakage coefficients are computed
using the zone n50 values. The volume and n50 value of each zone are used to compute the total
nominal air infiltration at 50 Pa pressure difference. The total exterior wall and window surface
area are used to compute an average air leakage coefficient
(q50 value) such that this total air infiltration
is obtained at 50 Pa pressure difference.
Using these coefficients and the static wind pressures,
a flow network is configured that computes the mass flow rates through
each wall and window.
When a custom q50 value for a wall or window is known, it can be
assigned by the user using the parameters use_custom_q50 and custom_q50.
The algorithm considers these q50 values as known and recomputes all remaining q50 values
such that the n50 value is reached.
In a similar way, the total n50 value for one zone can be forced by using
the zone parameters use_custom_n50 and n50.
In this case, only the remaining zones contribute to the total building
air leakage, which is subsequently attributed to the surfaces of only those zones.
When use_custom_q50=false, n50 is ignored and
sim.n50 is used instead for this computation.
I.e., the whole building is assumed to have the n50 value sim.n50
except for zones where use_custom_q50=true.
In case interzonalAirFlowType=OnePort then one port is
used to model the air exchange through each surface
and through cavities in internal walls (open doors).
When interzonalAirFlowType=TwoPorts two ports are used,
which increases the level of detail at the cost of having to solve
a more complex flow network.
The second port e.g. allows more detailed modelling of bidirectional
flow through cavities (e.g. open doors) using two flow paths instead of only
modelling the total flow through a single flow path.
The two-port option is still under development.
When setting unify_n50=true in the SimInfoManager
while interzonalAirFlowType=None, the n50 values are automatically
redistributed across the zones but instead of using pressure-driven flow, a fixed
infiltration flow rate is assumed. While this implementation is more detailed
and comes at no added computational cost, it is disabled by default
for backward compatibility reasons.