Abstract
Heat recovery from beds of particulate solids that are cooled for process requirements is an attractive practice in many industrial areas. In this paper several heat-recovery arrangements are analyzed under the hypothesis of unsteady-state operation. Assuming a constant and uniform cooling air flow rate, solutions based on single- and double- (parallel or series) hoods have been considered. Results show that significant improvements over a single hood can be achieved with double-hood systems, especially if the second hood is used as a source of preheated air. The improvements are in terms of heat-transfer efficiency and in terms of control flexibility to match the actual running conditions.
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