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Countercurrent exchange - Wikipedia
Description Professor Levenspiel's text remains the most practical volume available on the design of heat transfer equipment - an excellent introduction to real-world applications for advanced undergraduates and an indispensable reference for professionals. Each chapter includes illustrative examples and problems. Product details Format Hardback pages Dimensions x Other books in this series. Industrial Crystallization Narayan S. Add to basket. Cavitation Reaction Engineering Yatish T. A counter-flow heat exchanger is one in which the direction of the flow of one of the working fluids is opposite to the direction to the flow of the other fluid.
In a parallel flow exchanger, both fluids in the heat exchanger flow in the same direction. Figure 9 represents the directions of fluid flow in the parallel and counter-flow exchangers.
Under comparable conditions, more heat is transferred in a counter-flow arrangement than in a parallel flow heat exchanger. The temperature profiles of the two heat exchangers indicate two major disadvantages in the parallel-flow design. First, the large temperature difference at the ends Figure 10 causes large thermal stresses. The opposing expansion and contraction of the construction materials due to diverse fluid temperatures can lead to eventual material failure.
Second, the temperature of the cold fluid exiting the heat exchanger never exceeds the lowest temperature of the hot fluid.
Heat exchanger basics
This relationship is a distinct disadvantage if the design purpose is to raise the temperature of the cold fluid. The design of a parallel flow heat exchanger is advantageous when two fluids are required to be brought to nearly the same temperature. The counter-flow heat exchanger has three significant advantages over the parallel flow design.