Modeling and simulation of an air conditioning chilled water system

This paper is giving an overview of problems encountered and solutions available for the
simulation of an air conditioning system. Focus is given on the chilling water subsystem (from
the chiller to the cooling coil).
Main component simulation models (chillers, pumps, piping, valves, cooling coils and fans) are
presented; they are tuned on manufacturer’s catalogue data.
The way of integrating these models into a global HVAC system simulation is illustrated thanks
to one example: the simulation of (a part of) a real chilled water loop, which is submitted to an
exhaustive monitoring.
Cooling demands and corresponding energy consumptions are systematically simulated and
measured on one-minute time basis.
This provides the opportunity for a global checking of the simulation by comparing simulated
and measured cooling coil outputs.
Further work should also include comparisons on chiller consumptions.