Heat recovery systems

Air to air heat exchangers are devices designed to recover heat from exhaust to inlet ducts in order to preheat or pre cool fresh air introduced to a building. In addition these systems remove excess humidity, contaminants and other air pollutants especially when applied to tightly built new buildings. This way they maintain heating requirements in winter to a minimum, contribute to natural ventilation and in the summer period they keep the heat of warm ambient inlet air outdoors. Systems efficiencies vary between 60-95% according to the type of heat exchanger considered. Their life span is over 15-20 years (as they have no moving parts) and warranties are provided for up to 10 years. Payback

[1]

period is considered to be roughly 3 years. Furthermore these systems reduce peak demand charges which would mean down scaling the size of a cooling-heating system installed.

[2]

Electrical consumption is mainly due to the fun which varies from 10-15W for a very low flow rate of 50 m3/h to 125W for a flow rate of 300m3/h