Abstract
Various ratios based on the dry and wet bulb temperatures of the drying and exhaust air of a crop drier have been considered by previous workers as measures of performance. These ratios were found to be unsatisfactory as they take no account of the sensible heat in the ambient air. A ratio has been proposed which considers the sensible heat in the drying air as being the effective heat for drying. The relationship between this ratio and the three drying parameters, air flow rate, drying air temperature and the final average grain moisture content, is established experimentally and a chart showing these relationships for a given moisture content developed. From this chart, knowing the air flow rate and the drying air temperature, it is possible to determine the value of the ratio at which the drying operation should be terminated. Alternatively air flow rates and drying air temperatures to give a high drying efficiency may be selected.
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