2.3. CTES sizing methodology
2.3.1. Energy storage model
For the techno-economic analysis, a deterministic model is
adopted to simulate the behaviour of the storage. The purpose of
the model is to evaluate the amount of electrical energy consumed
to charge the storage when in operation. The first step consists
of defining the amount of cooling energy to be shifted by means
of the storage depending on the type of action to be implemented.
Once defined the amount of energy to be shifted, the amount of
cooling Energy-To-Charge is calculated. The Energy-To-Charge can
be easily calculated as:
where η is the charge/discharge efficiency of the storage, also called
“round trip efficiency”. The storage efficiency is approximated as a
constant parameter, evaluated considering the average charging, discharging
and storing losses. The steady-state model does not account