The performance of an indirect evaporative cooler provided with a flat
plate heat exchanger was studied by simulating its operation in a typ
ical building, using the weather conditions of Athens. Simulations wer
e performed with the TRNSYS code. The results were the temperatures at
the outlet of the cooler and inside the building, the comfort hours a
nd the hours of cooler operation per day. The sensitivity of the coole
r performance to night ventilation rate and the size of the south wind
ow glazing were also investigated. Simulation results showed that the
cooler increases the number of comfort hours per day inside the buildi
ng, since the indoor temperature is significantly lower when the syste
m operates than under free-floating conditions. It was found also that
night ventilation increases the comfort hours of the building while r
educing the hours of operation of the cooler.