A continuous countercurrent drier is used to dry 425.6 kg dry solid / h containing 0.035...

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A continuous countercurrent drier is used to dry 425.6 kg dry solid / h containing 0.035 kg total moisture / kg dry solid. The granular solid enters at 25° C and leaves at 60°C. The heating medium is air which enters at 84.2° C and has a humidity of 0.0175 kg moisture/ kg dry air and leaves at 32.8° C. Calculate the air flow rate and the outlet humidity, assuming the heat losses from the drier to be 9300 kJ/h. The constant heat capacity of the dry solid is 1465 kJ/kg K. (12) (April '98). A continuous countercurrent drier is used to dry 425.6 kg dry solid / h containing 0.035 kg total moisture / kg dry solid. The granular solid enters at 25° C and leaves at 60°C. The heating medium is air which enters at 84.2° C and has a humidity of 0.0175 kg moisture/ kg dry air and leaves at 32.8° C. Calculate the air flow rate and the outlet humidity, assuming the heat losses from the drier to be 9300 kJ/h. The constant heat capacity of the dry solid is 1465 kJ/kg K. (12) (April '98).

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To calculate the air flow rate we have to determine the amount of moisture that needs to be removed ... View the full answer