Favre and Coantio 



A first approximatLon representation of radiative beat ex- 

 changes seems also to be feasible in the laboratory. At the small 

 scale we are interested in, the main effect of short wave solar radi- 

 ation is a global elevation of the oceanic temperature, that can be 

 reproduced by heating the water mass. Due to the radiative trans- 

 fer process mentioned in II. 3, the reproduction of infrared heat 

 exchange is more delicate, but its primary effect yet remains the 

 cooling (or occasionally heating) of the interface itself. This 

 localized heat sink shall be simulated, either by increasing the 

 cooling produced at the same place by evaporation, or by lowering 

 the temperature of the ceiling of the test section, and thus con- 

 trolling the radiative heat exchange between this wall and the water 

 surface. 



The designed facility will allow independent control of air 

 and water temperatures in the 5 C - 35 °C range, with an accuracy 

 of the order of 0.1 °C. The relative humidity of air entering the test 

 section will be varied from 60% to 100%. Fig. 7 schematizes the 

 main components of temperature and humidity control system: cooling 

 and drying (by condensing) coils, heating coils and vapor injectors 

 in the air circuit; cooling and heating heat exchangers in the water 

 circuit; heat generator, frigorific unit with cooling tower, steana 

 boiler, regulating system. The working principle is represented 

 using the temperature-mixing ratio diagram. 



J « 10 » 



Fig. 7. Schematic diagram of temperature and humidity control 

 systems 



48 



