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Improved Energy Efficiency in forced Air Dry Buildings,

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The objective of this project was to modify the existing FAD buildings to make them more energy efficient with no loss of quality of the product of safety. Bench-scale drying studies using a one cubic foot drying chamber showed that the use of radiant heat could reduce the drying time using normal air flow rates and temperatures, or the same rate of drying could be achieved at reduced temperatures or reduced air flow rates. The best approach for saving energy was to reudce the flow of air to the FAD bay. This would reduce the amount of energy used to heat the air in direct proportion to the air flow and would also reduce the size of pollution abatement equipment needed to clean the air, should they be required. The lower air flow rates would require a better air distribution system within the FAD bay in order to maintain uniform drying temperature with the bay. The reduction in air flow from 5500 cfm to 1500 cfm when combined with the increased amount of propellant dried from 10,000 pounds to 8,600 pounds showed an energy savings of more than 70. The analyses of the propellants dried in the modified bay were found to meet all the propellant specifications. Two lots of propellant which were dried in the modernized FAD have been shipped for gun tests which will be conducted by ARRADCOM. The design criteria for converting all the FAD bays to energy efficient deisgn has been submitted to ARRADCOM for implementation.

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