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A Small-Scale HeaT Exchanger Capable of Heating Milk to 325° F.¹

Department of Dairy and Food Industries, University of Wisconsin, Madison

ABSTRACT

For some time we have been interested in such problems as the effect of ultra-high temperatures on the physical and chemical properties of whole and concentrated milks, the thermal destruction of bacteria and bacterial spores, and heat-caused nutritional changes in dairy products. A. need for a bench-size heat exchanger, capable of heating milk and concentrated milks to high temperatures in a short period of time, was the incentive to build such an apparatus. Certain performance requirements were decided upon. The heat exchanger should operate at the rate of 1 to 2.5 pt. per minute. It should be capable of heating milk from 40 to 325° F., and to do this in less than 3 sec. In addition, the apparatus must be simple to operate and yet dependable in its performance. A heat exchanger meeting these demands has been made and successfully operated. This unit is pictured in Figure 1 and diagrammed in Figure 2.

¹ This unit was built with financial support from the United States Steel Corporation.