Realistic model

This tutorial uses a realistic BIM model: the duplex apartment sample model, a two-storey dwelling with many rooms (Duplex_A.ifc in tests/models/space_boundary).

from pathlib import Path

from ifctrano.building import Building

building = Building.from_ifc(Path("Duplex_A.ifc"))
building.save_model()

or

ifctrano create Duplex_A.ifc --show-space-boundaries --simulate-model

The space boundaries derived from the geometry:

The generated model in OpenModelica (taken with an earlier version; the layout may differ):

Results

Free-floating zones (the model has no heating) for the first ten days of January.

Days 3 to 10 of the year (the first 2 simulated days are a warm-up and are left out).

Case	Zone	Mean [°C]	Minimum [°C]	Maximum [°C]
Duplex	A101	12.2	10.0	15.3
Duplex	A102	13.4	6.0	42.9
Duplex	A103	11.5	9.3	14.6
Duplex	A104	10.7	9.5	12.1
Duplex	A105	11.0	9.3	13.2
Duplex	A201	13.6	11.4	16.4
Duplex	A202	11.1	7.5	19.9
Duplex	A203	12.2	8.4	26.9
Duplex	A204	12.7	10.8	15.4
Duplex	A205	12.4	10.4	15.0
Duplex	B101 3q	11.0	9.3	12.8
Duplex	B102 cz	8.6	5.2	13.2
Duplex	B103 3s	11.8	9.5	14.8
Duplex	B104 3p	10.5	9.4	11.8
Duplex	B105	10.5	9.0	12.4
Duplex	B201 3g	13.0	11.1	15.2
Duplex	B202 3a	10.6	8.5	15.8
Duplex	B203 39	9.9	7.0	14.0
Duplex	B204 3c	12.4	10.5	14.6
Duplex	B205	12.1	10.3	14.3
Duplex	R301	20.0	14.4	26.2
Duplex	Mean of the zones	12.0	9.4	15.8

What to expect. Most rooms stay between the outdoor temperature and 15 °C without heating; rooms with large windows and little floor area heat up in the sun.

What the simulation shows. The mean of the 21 zones is 12 °C over days 3 to 10, most rooms averaging between 10 and 13.5 °C. Two rooms stand out:

• A102 averages 13 °C but peaks at about 43 °C on sunny afternoons. It has 11.7 m² of windows for 27.7 m² of floor, and, like every room, constructions made of ifctrano's default material, an insulation-like material of 80 kg/m³ (see the limitations): almost no thermal mass absorbs the solar gains. Such peaks in January are an artefact of the default material properties.
• The roof space R301 averages 20 °C: no roof surface was found for it (only 31.6 m² of external wall for 135 m² of floor), so the internal gains of its large floor area have little surface to escape through.

Edit the material section of the configuration with the real properties of the materials, and check the space boundaries (--show-space-boundaries), before drawing conclusions on overheating.