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The JOULE Research Project into Passive Downdraught Evaporative Cooling (PDEC) concluded that a mixed mode approach (PDEC + back-up system) is technically and economically viable, and is competitive against conventional air-conditioning for office buildings in southern Europe. This research was based on a specification using misting nozzles under high pressures (20-50bar) to generate a high rate of evaporation and to minimise moisture carry-over, but it still had a number of disadvantages: high quality water required, risk of nozzles blocking up, risk of dripping (carry-over), risk of microbiological contamination, increase in moisture content of the air.
Direct evaporative cooling using porous ceramic evaporators avoids the need for high pressure water supply, drip trays and the maintenance implications of spray nozzle systems. Such a system also reduces the risk of...

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