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Experiment - Heat Transfer in a Plate Heat Exchanger Essay Example

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Experiment - Heat Transfer in a Plate Heat Exchanger

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Experiment - Heat Transfer in a Plate Heat Exchanger. Unlike conduction or convection, which depend upon physical contact for thermal-energy transfer, radiation depends upon electromagnetic waves as a means for transferring thermal energy from a hot source to a low-temperature sink.The simplest type of heat exchanger is the double-pipe heat exchanger which is essentially two concentric pipes with one fluid flowing through the center pipe while the other fluid moves co-currently or counter-currently in the annular space. The length of each section is usually limited to standard pipe length, so that if an appreciable heat-transfer surface is required, banks of sections are frequently used. If the required area is too large, a double-pipe exchanger is not recommended.

The use of a double-pipe heat exchanger is not limited to liquid-liquid heat exchange but may also be used for gas-liquid exchange and for gas-to-gas exchange.When the required heat-transfer surface is large, the recommended type of exchanger is the sell-and-tube variety. In this type of heater or cooler, large heat-transfer surface can be achieved economically and practically by placing tubes in a bundle; the ends of the tubes are mounted in a tube sheet. This is very commonly accomplished by expanding the end of the tube into a close-fitting hole in the tube sheet by a process called “rolling”. The resultant tube bundle is then enclosed by a cylindrical casing (the shell), through which the second fluid flows around and through the tube bundle. The fluid flowing through the tubes enters a header or channel where it is distributed through the tubes in parallel flow and leaves the unit through another header. Either the hot or the cold fluid may flow in the shell of the exchanger surrounding the tubes. Parallel flow through all tubes at a low velocity gives a low heat-transfer coefficient and low pressure drop. For higher rates of heat transfer, multi-pass operation may be used. Complexity in design sometimes results in expense in fabrication that must be balanced against improved performance and another disadvantage of the multi-pass exchanger is the added frictional loss due to higher linear velocities and the entrance and exit losses in the headers.If heat exchange is occurring between two fluids where one fluid has a very high resistance to heat transfer in comparison to the other, the higher-resistance. Experiment - Heat Transfer in a Plate Heat Exchanger.

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