Heat ExchangersDOE-HDBK-1018/1-93HEAT EXCHANGER APPLICATIONSThis means the feedwater is exposed to the condensed steam first and then travels through thetubes and back around to the top right end of the heat exchanger. After making the 180 bend,the partially heated feedwater is then subjected to the hotter steam entering the shell side. Figure 8 U-tube Feedwater Heat ExchangerThe feedwater is further heated by the hot steam and then exits the heat exchanger. In this typeof heat exchanger, the shell side fluid level is very important in determining the efficiency ofthe heat exchanger, as the shell side fluid level determines the number of tubes exposed to thehot steam.RadiatorCommonly, heat exchangers are thought of as liquid-to-liquid devices only. But a heatexchanger is any device that transfers heat from one fluid to another. Some of a facility'sequipment depend on air-to-liquid heat exchangers. The most familiar example of an air-to-liquid heat exchanger is a car radiator. The coolant flowing in the engine picks up heat fromthe engine block and carries it to the radiator. From the radiator, the hot coolant flows into thetube side of the radiator (heat exchanger). The relatively cool air flowing over the outside of thetubes picks up the heat, reducing the temperature of the coolant.Rev. 0ME-02Page 13
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