Environmental Engineering Reference
Temperature is the most contributory factor. This value is increased for the highest
temperature differences between both airstreams (supply and return).
The combined system built allows a feasible energy exchange between the supply
airstream and the return one, improving the operation in air-conditioning systems. It is a new
alternative device for use as a recovery system. The configuration chosen (crossed flow) is
the most adequate from an operational point of view.
The characterization of the system was carried out by employing experimental design
methodology. A factorial design was performed by analysing how the factors used affect the
characteristics analyzed. The contributions of the single factors and their interactions were
presented by carrying out a variance analysis. The superiority of the evaporative cooling
device under the operating conditions was clearly shown.
An estimation of the energy saved by the combined system was carried out, showing the
possibilities of implementing this solution to save energy and also to improve the indoor air
quality by means of increasing the ventilation rates.
This work was developed thanks to the support of the Spanish Ministry of Education and
Science of Spain which awarded a Ph.D. scholarship with the reference number: AP2003-
3730 IME in order to carry out the Ph.D. work entitled: “Waste Energy Recovery using a
combined system: SIECHP”.
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