TYPES OF HEAT EXCHANGERSDOE-HDBK-1018/1-93Heat ExchangersTypesof HeatExchangersFigure 2 Plate Heat ExchangerBecause heat exchangers come in so many shapes, sizes, makes, and models, they are categorizedaccording to common characteristics. One common characteristic that can be used to categorizethem is the direction of flow the two fluids have relative to each other. The three categories areparallel flow, counter flow and cross flow.Parallel flow, as illustrated in Figure 3, exists when both the tube side fluid and the shellside fluid flow in the same direction. In this case, the two fluids enter the heatexchanger from the same end with a large temperature difference. As the fluids transferheat, hotter to cooler, the temperatures of the two fluids approach each other. Note thatthe hottest cold-fluid temperature is always less than the coldest hot-fluid temperature.ME-02Rev. 0Page 4
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