A Dry Materials Heat Exchanger With Regeneration

[+] Author and Article Information
M. R. Berry, R. W. Parker, R. W. Dickerson

Food Engineering Branch, Bureau of Foods, Food and Drug Administration, Department of Health, Education, and Welfare, Cincinnati, Ohio

J. Heat Transfer 96(4), 518-523 (Nov 01, 1974) (6 pages) doi:10.1115/1.3450238 History: Received February 05, 1974; Online August 11, 2010


The concept of regeneration is successfully demonstrated for the heat processing of sorptive materials in a continuous-flow heat exchanger. Data are presented for oats, cracked corn, and black peppercorns. Regeneration efficiency depends on the relative flow rates of the air and the product. Maximum efficiency was attained with the ratio of the air-to-product heat capacity fluxes near unity. Regeneration efficiency is also dependent on the moisture content of the product entering the heat exchanger. A maximum efficiency of 57 percent was obtained for black peppercorns that entered the heat exchanger with moisture contents of 5 to 8 percent (dry basis) and were processed to a holding temperature of 175° F (79.5° C). Significant drying of the product was realized in the heat exchanger/regenerator. For oats, processed at 200° F, approximately half the moisture was removed in a single pass when the inlet moisture content was 13.7 percent. The amount of drying decreased as the moisture content of the product entering the heat exchanger was lowered. Drying also decreased when the processing temperature was lowered. Considerable energy is consumed by drying, and thus the regeneration effect for high moisture products is not as apparent.

Copyright © 1974 by ASME
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