Principle of operation
We circulate at low speed, through a cellulose panel, an air flow at 30 ° C and 30% relative humidity. Through this process, the air evaporates the water and thus lowers the temperature of the air at the outlet to reach 20 ° C at 65% relative humidity.
Considering the air at 30 ° C and 40% relative humidity, inside a building, where usually with activity and thermal load, the interior temperature is 35 to 38 ° C. By blowing air at 22 ° C thanks to bioclimatization, the destratified temperature at human height will be around 25 ° C: The gain is around 13 ° C between the usual temperature and the bioclimatized air. The room temperature returns to a comfort temperature. The key to operation is the use of fresh air, that is to say the permanent renewal of air (about 20 renewals per hour). The air blown into the building must stay there as little time as possible before being evacuated.
Constant air renewal
In order to obtain an optimum evaporative result, the air drawn in from the outside which is blown into the room must be extracted as quickly as possible, either naturally by opening a door, a window or a grille. decompression, or forced and dynamic by installing an extractor with a flow rate equal to the insufflation.
Finally, what is essential is that the room bioclimatized by ECOFRESH becomes an air circulation corridor at very low speed to avoid drafts.
Why renew the air so quickly? Quite simply so that the fresh air ejected from the ECOFRESH bioclimatizer, for example at 24 ° C, can pass through the room at the temperature closest to that of the ECOFRESH without taking on the thermal mass that is produced in the room (machine heat, human heat, hot and polluting steam …).
How many times must the air in the room be changed? The value usually used is 20 times the volume of the building or room. For example, for a room of 400 m² with an average height of 5m, ie a volume of 2,000 m3, the renewal requirement will be 20×2000 = 40,000 m3 / h. We will therefore choose 2 evaporative bioclimatizers of 20,000 m3 / h or a single model of 40,000 m3 / h. However, in each trade, the internal thermal loads are different.
We have understood that the relative humidity of the outside air compared to the dry bulb is an essential element for optimizing the results of the ECOFRESH bioclimatizer, adiabatic evaporative cooler.
Thus, as we explained previously, the drier the outside air, the better the result will be. In the hot summer period, the average humidity in our regions is around 40%. As a result, the bioclimatic result of ECOFRESH is almost always exceptional with a temperature difference of nearly 10 ° C in many cases between the air drawn in and the air supplied.