This model is the main zone model. Surfaces such as windows and
walls can be connectured using the propsBus connectors
and HVAC can be connected using FluidPorts. The model
contains models or options for radiative heat exchange, internal
heat gains, interzonal air exchange and a zone air model.
Any number of surfaces can be connected to the
propsbus of a zone. The number of connected surfaces
must be specified using the parameter nSurf and each
of the nSurf propsbus components has to be connected
to exactly one surface.
Parameter V must be used to define the total zone
air volume.
Parameter hZone is the zone height, which may be
used to define the zone geometry.
Parameter A is the total floor surface area of the
zone.
Replaceable parameter airModel determines the type
of air model that is used.
Replaceable model occNum allows the user to choose
a way to define the number of occupants that are present in the
zone. This number of occupants is used to compute the internal heat
gains in the model. Depending on the chosen model, an external
input yOcc may be exposed by the zone model.
Parameter occTyp determines occupants properties.
These properties may be used to evaluate internal comfort, or to
determine internal gains.
Parameter comfort determines how occupant comfort
may be computed.
Parameter intGai determines internal gains model
type. By default the internal gains model considers a fixed
sensible and latent heat load and CO2 production per person.
Parameter simVieFac may be set to false to simplify
the view factor calculation. This leads to a less accurate
computation of view factors, but this approach is more robust. It
may be used when the initial equation that computes the view
factors does not converge.
Replaceable model interzonalAirFlow allows to
choose between multiple options for modelling air leakage and
interzonal airflow. This model can have a strong influence on
numerics and on model results if used inappropliately, therefore
only change the default value if you know what you are doing.
The lighting options allow to compute the thermal heat gains
originating in the zone lighting. We assume that electric power use
is converted for 100 % into heat gains. The record
rooType determines the type of room, and the typical
illuminance that corresponds to such a room type. The record
ligTyp determines what kind of lighting device is
used, which contains the lighting efficacy of the device, i.e. how
much electric power is required per square meter of lighted zone.
We assume that the zone is lighted completely. The model
ligCtr determines how the lighting is controlled. See
IDEAS.Buildings.Components.LightingControl
for the available options.
The design heat losses Q_design are calculated via
an initial equation based on, but not exactly according to, NBN EN
12831-1 ANB:2020. This value includes heat losses via transmission
(QTra_design) and infiltration
(QInf_design) and accounts for reheating
(QRH_design). Ventilation losses are not considered as
this system is typically modelled in a seperate block, see for
example IDEAS.Templates.Interfaces.Building.
In this model, the total design losses are calculated as the sum of
the design losses from the building envelope (transmission,
infiltration, reheating) and the ventilation system.