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considered when frequent shell side cleaning is required [11]. This design allows the heat exchanger to have a high degree of safety on mixing of the two fluids. This characteristic can be extremely beneficial if cross contamination of the two flows are not acceptable. The configuration also provides the opportunity for mechanical tube side cleaning where the heat exchanger can be disassembled and physically cleaned to increase the heat transfer rates. However the design does contain certain limitations including only having the capability for a small temperature difference between the working fluids without the addition of expansion joints. Other limitations are that only low pressure applications can be used, and the tubes are fixed inside the shell meaning that shell side cleaning is not possible without the use of chemicals [27]. The following figure demonstrates the configuration of this type of shell-in-tube heat exchanger. Figure 7. Fixed Tube sheet, 2-Pass Shell-and-tube Heat Exchanger [72]. The second configuration considered is a U-tube design which contains a single set of tubes in a "U" shape located inside the shell. This configuration is the simplest design and, because the fluid enters and exits from the same side, requires only one seal and joint compared to two in other designs. As a result of style, there are inherently less leaking points in the shell side and less concern with thermal expansion. This configuration is a very useful when high tube side pressure is required and also allows for easy access to maintenance on the shell side. However in the case of a failure of an individual tube, the entire bundle must be replaced due to access problems with tubes not located on the outer perimeter [11]. This access problem also leads to 20PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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