Are the appliances part of the base building?
The definition of base building appliances is pretty straightforward. It goes something like this:
Can you unplug and relocate the installed appliance without any destruction, alteration or heavy works? and is this appliance directly serves and affects all building occupants/tenants?
If the answer to the first question is “yes” and to the second one is “no”, then the appliance is not to be considered as a base-building appliance, but rather a portable appliance. As an example, office computers are not base-building appliances whilst office ventilation system is.
Note that the energy use of appliances is different from heat gains from appliances. For an accurate energy model, you must identify the heat gains from all appliances with precision or the cooling energy demand could be far unrealistic.
What is the energy modelling used for?
If you are modelling to demonstrate compliance with the code, then you got to follow the bread crumbs to what the regulations demand. Here, we focus on JV3 & Green Star modelling as the two major Australian Compliance pathways.
However, if you are modelling your building for non-regulatory purposes (e.g. feasibility assessments) then you must weigh on what portion of appliances energy use is to be considered.