Transcription of CHAPTER 6 HEAT TRANSFER APPLICATIONS - …
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CHAPTER 6 HEAT TRANSFER APPLICATIONS - …
CHAPTER 6 heat TRANSFER APPLICATIONS The principles of heat TRANSFER are widely used in food processing in many items of equipment. It seems appropriate to discuss these under the various APPLICATIONS that are commonly encountered in nearly every food factory. heat EXCHANGERS In a heat exchanger, heat energy is transferred from one body or fluid stream to another. In the design of heat exchange equipment, heat TRANSFER equations are applied to calculate this TRANSFER of energy so as to carry it out efficiently and under controlled conditions. The equipment goes under many names, such as boilers, pasteurizers, jacketed pans, freezers, air heaters, cookers, ovens and so on. The range is too great to list completely. heat exchangers are found widely scattered throughout the food process industry. Continuous-flow heat Exchangers It is very often convenient to use heat exchangers in which one or both of the materials that are exchanging heat are fluids, flowing continuously through the equipment and acquiring or giving up heat in passing.
Figure 6.1 Heat exchangers Applying the basic overall heat transfer equation for the heat transfer in the heat exchanger: q= UA T uncertainty at once arises as to the value to be chosen for T, even knowing the temperatures in the entering and leaving streams.
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