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K102
Over-all Heat Transfer Coefficients in Agitated Vessels

John Frank Pietranski, P.E., Ph.D.

This four hour course will focus on deriving the general Application Equation used for calculating the over-all heat transfer coefficient in agitated vessels. Several assumptions allow for development of a shortened simplified Application Equation. The over-all coefficient is based on a relationship of the individual heat transfer coefficients within the system. Following the Application Equation derivations, correlations are presented from the open literature which define the methodology for calculating the individual heat transfer coefficients. Jacket side heat transfer coefficient correlations for condensing vapors and for flowing liquids are included. A correlation for the agitated liquid is presented along with a table of typical fouling factors for selected fluids. Two industrial examples are given in order to demonstrate the calculation techniques for the individual heat transfer coefficients, along with the over-all coefficient determination. The first example cools an agitated batch of hot water by utilizing chilled water in the vessel jacket. The second example heats an agitated batch of cold water by using condensing steam in the vessel jacket. This course includes a True-False quiz at the end, which is designed to enhance the understanding of the course materials.

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