Community Research and Development Information Service - CORDIS


Passive Downdraught Cooling Systems Using Porous Ceramic Evaporators

Project ID: ENK6-CT-2000-00346
Funded under: FP5-EESD


The Evapcool project was initiated to design, develop and test new porous ceramic products for improved evaporator performance as part of an innovative cooling system and for integration within buildings. The main parameters affecting the rate of evaporation are ambient conditions (dry - wet bulb air temperature) and the rate of air movement over the evaporating surface, as well as water pressure and porosity of the evaporator. Theoretical models of both the direct and indirect evaporative cooling systems were found to have reasonable agreement with the climate chamber at Nottingham University. The casting technique was used in this project for the manufacture of the prototype evaporators, which were designed to be stacked, hung or cantilevered, according to the different options for building integration. The components developed in the project are the subject of a patent application, and commercial partners are being sought to make these components available in the market.
A design proposal for the integration of theses components within an office building in Teheran, Iran, was tested using dynamic thermal analysis (Trnsys) and CFD. Results indicated that for this location, the Evapcool system will meet 85% of the cooling load of the offices. Predicted annual energy savings for cooling were 32-42kWh/m2. The analysis for this project also revealed the degradation in performance with height of the array. From this data a simplified design tool has been developed to enable designers to size the system. A series of seminars and workshops devoted to downdraught cooling are planned to disseminate this research project.

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