Orthodox black tea withering trough airflow: hygrometric wet-bulb depression calculations?
4 Answers from travellers
Withering green leaf moisture management in high-elevation tea factories relies on precise hygrometric monitoring. Factory managers use sling psychrometers to record dry-bulb and wet-bulb temperatures in withering lofts. The wet-bulb depression (the difference between dry and wet readings) dictates fan operation: during wet monsoon nights when ambient relative humidity climbs to 95%+, wet-bulb depression shrinks to near zero. Managers fire up steam-heat exchangers to warm incoming air slightly, restoring a functional 2 to 3°C wet-bulb depression to evaporate moisture without chilling the leaf.
Failure to manage withering humidity leads to uneven moisture loss across leaf layers, producing flaky, under-withered dhool during morning rolling.
Traditional multi-story withering lofts utilize gravity ventilation windows that allow cross-breezes to circulate naturally across hessian troughs.
Properly withered leaf feels limp and soft like a kid-glove, showing no green snap when bent along the midrib.
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