Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
As Denis said, generally.
For your specific application, which is modeling one room as part of a larger building, the easiest is to put one wall as Outdoors and the 3 "inside" walls as Adiabatic. This will negate the heat transfer from these wall. This assumption is fine only if you think you have similar temperatures on both sides of the inside walls (eg: it's another office/room with the same thermostat setpoint on the other side).
If you have different conditions, you can use a SurfaceProperty:OtherSideCoefficients for example to set a specific temperature / temperature equation on the other side, but this is slightly more complicated.
