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Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Owen CLUS.

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Presentation on theme: "Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Owen CLUS."— Presentation transcript:

1 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Owen CLUS

2 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) 2006 European PHOENICS User meeting Wimbledon, 30th Nov. 1st Dec., 2006 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Owen CLUS Jalil OUAZZANI Marc MUSELLI Vadim NIKOLAYEV Girja SHARAN Daniel BEYSENS Université de Corse Arcofluid Université de Corse CEA/CNRS-ESPCI Paris Indian Inst. of Management, Ahmedabad CEA/CNRS-ESPCI Paris

3 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Atmospheric vapour harvesting by radiative cooling Researches for condensing atmospheric vapor as alternative water resource in arid areas without energy supplying

4 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Atmospheric vapour harvesting by radiative cooling Researches for condensing atmospheric vapor as alternative water resource without energy supplying Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) ROOF CLEAR SKY GROUND substrate Insulation Radiative budget - 70 W/m² Surface 3 to 8°C below T ambient Innovative formulations cheap polymers LDPE, paint high IR emissivity polymer basis Radiative Filler

5 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Pilots, Prototypes 1 m² Dew = 30 % of rain Quantitative systems 15 m² 7 L / night 800 m² 300 L/ night Experimental prototypes 30 m² 10 L / night 1 m² 0.6 L / night FRANCE CROATIA INDIA

6 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) CFD simulations of radiative condensers The CFD tool has been developed for helping decision and technical choices before implementing these huge systems without preliminary empirical tests

7 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Radiative condenser as thermal machine Wind flow condensation in weak wind, limit free / forced convection variability of meteorological data induces long time outdoor experiments no description for complex shapes without empirical corrections Condenser shape and thermal properties Free convection heating Radiative cooling forced convection heating

8 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Radiative cooling inclusion in CFD dR = (ε s,θ σT amb 4 – ε r σT rad 4 ) dΩ ε r = 0.94 Specific radiative cooling for each shape angular sky emissivity isotropic radiator emissivity

9 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Radiative cooling inclusion in CFD FORTRAN tool for integrating radiative budget on various shapes angular integration dissipation law included in Phoenics computation: E R = f(T) Radiator Temp. (°C) Radiative budget (W/m²)

10 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Radiative condenser described in CFD 3 Dimensions virtual reality description Shape Materials LOG Wind Profile Convective heating Radiative cooling Radiative cooling power E R is dissipated for each radiator cell. T RAD (one phase model as in dry air) Grid Volumes Convective heating for every shapes and for various wind speeds is given by Iterative calculation P T ρ u v w ERER

11 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Cone-shaped condenser simulation Wind speed variations for 0.25 ; 0.5 ; 1.0 and 2.0 m/s at 10 m WIND PROFILE side tilt variations for 50 ; 40 ; 35 ; 30 ; and 25 Deg.

12 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Cone-shaped condenser simulation 30° tilted More efficient

13 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Cone-shaped condenser prototype (France) 30° tilted 7.3 m², Φ 3 m L water / night 38 % more water than on the 1m² planar condenser

14 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) CFD simulations validation Comparison of simulated efficiency with physical measurements on real system on 5 various condensers from 0.16 to 255 m² installed during long period 1 m² planar condenser is the reference because always set up simultaneously nearby each system

15 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Radiative condenser as thermal machine (B) (A) 0.16 m² (D) 30 m² (C) 7.3 m² (E) 3 ridges 255 m² 1 m² REF (B)

16 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Comparison Temperature gain / Dew gain Non quantitative comparison, the cooler the surface, the better the dew yield. Surface Temperature T COND, Simulations rough results

17 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Comparison Temperature gain / Dew gain Dew gain related to 1 m² REF condenser water volume. Cooling power or temperature gain related with Ta and 1 m² REF:

18 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Comparison Temperature gain / Dew gain Dew gain related to 1 m² REF condenser water volume. Cooling power or temperature gain related with Ta and 1 m² REF:

19 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Comparison Temperature gain / Dew gain Dew gain related to 1 m² REF condenser water volume. Cooling power or temperature gain related with Ta and 1 m² REF:

20 Conclusion INDIA Little set of data is needed to conclude the validation of the program This program has been advantageously used in Dew factory project for orientation and yields prospective Next step is to develop a two phases dew condensation simulation for more accurate quantitative results

21 Radiation-cooled Dew Water Condensers Studied by Computational Fluid Dynamic (CFD) Owen CLUS CONTACT :


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