Test Case Name
multizone_office_simple_hybrid
Brief Description
The test case building, known as Infrax, is a four-story office building with 2,232 m2 of conditioned space located in Dilbeek, Brussels, Belgium. This office building contains open-plan offices, cellular offices, and meeting rooms. The building envelope model is composed of 27 zones, of which 21 are conditioned and 14 occupied. The 1st, 2nd, and 3rd floors are mainly open offices and separate zones exist for the north and south spaces, the individual meeting rooms and the bathrooms (which are not conditioned). The ground floor includes individual conference rooms and several facilities (first aid room, canteen, storage and server rooms).
The supply heating system is composed of two ground source heat pumps. The source-side of the heat pumps is connected to an array of 94 vertical ground-source heat exchangers. The sink-side of the heat pumps is connected to a water storage tank and to the manifold, from where heat is distributed to multiple emission loops. Cooling is provided by means of two heat exchangers connected to the vertical ground heat exchanger array and to a cooling tower.
The emission system of the building is hybrid, with TABS as the slow-reacting system which provides the main load. To provide a fast-reacting peak load, the system relies on conditioning the air from the air handling unit (AHU). The AHU takes and conditions the air from outside and distributes it to the different building zones through the ventilation ducts. Within the ducts there exist VAV boxes and small re-heating coils for the fine-tuning of the building. Nevertheless, not all zone ducts are equipped with the VAV boxes.