Dear Khamis,

Adding air from outside will not be possible. These Precooling Chambers have to abide by certain norms and regulation laid down by the Export authorities in our country as well as the authorities in those countries where these fruits are being exported. There should not be any possibilities of contamination. If infiltration of outside were allowed then all these problems would not have come.

The only solution that comes to my mind which may be wrong and if so you have to correct me is that, we lower the Td and attain as much as RH is possible. The only possibility is that at a temperature of -1oC there is a possibility of a swing in the RH and which may be reduced. To counteract the same, I am thinking of installing a small RO system and supply the required water for raising the RH by the adiabatic humidifier. These will be operating for a very short period.