STUDY OF LOW-GRADE WASTE HEAT RECOVERY

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TUDY OF LOW-GRADE WASTE HEAT RECOVERY ( tudy-low-grade-waste-heat-recovery )

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Figure 11. Outside Packed Lantern Ring Floating Head Exchanger (Left) and Outside Packed Stuffing Box Floating Head Exchanger (Right) [5]. The previous discussion was centered around the tube configurations in different types of shell- and-tube heat exchangers but the shell side of the heat exchanger can also have different configurations. These types of configurations include single pass, two pass and divided flow. The single pass shell is the most common type and occurs when the shell side inlet and outlet are physically located on opposite sides of the heat exchanger. This setup has the fluid flow enter on one side, pass through a series of baffles and across the tubes until the fluid makes its way to the opposite side, where it then exits the heat exchanger. The two pass shell has both the inlet and exit on the same side and requires a longitudinal baffle running down the center of the shell. Because of pressure drop and thermal stress and heat leakage in the baffle, this setup should only be used when a shell side pressure drop is a maximum of 10 psi and when the shell side temperature is less than 380°F. This system operates by the inlet fluid entering the heat exchanger and flowing through a series of baffles, across tubes on the top half until it reaches the opposite side. The flow is then directed down and back the opposite direction across another set of baffles and across the tubes on the lower half until it is exhausted below the inlet. The third type of shell design is the divided flow shell. This configuration has a central inlet nozzle and an outlet nozzle on each end, or vice versa. This type of shell configuration is typically used in condensing heat exchangers because it requires a smaller pressure drop [11]. 24

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