Fig. 4
Operating range (grey shaded area) of CO2 scrubbers as determined by fan speed and ambient air mixing (a). Each fitted line indicates pre-programmed fan speed, and the points down each curve the progressive closure of the ambient air by-pass valve. Concentration difference of CO2 from ambient for the 10 day scrubbing period of the veraison experiment described in this paper (b), and an example from a subsequent experiment in 2015 (not presented) where the scrubbing tubes were re-wet on a daily basis to replace water lost due to evaporation (c)