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Shell and Tube Heat Exchangers are used extensively throughout the process industry and as such a basic understanding of their design, construction and performance is important to the practising engineer. The objective of this paper is to provide a concise review of the key issues involved in their thermal design without having to refer to the extensive literature available on this topic. Shell and Tube Heat Exchangers are intended for heating or cooling process fluids, they are for example suitable for closed circuit cooling of electrical equipment using demineralised water and for cooling water soluble oil solutions in quenching tanks. The shell side usually contains the process fluid and the tube side water from the town mains or a cooling tower, or an ethylene glycol solution from a chiller unit. Some of the situations its process through revise arrangement, before known to consult them. The author may be claims nothing shows originality but believes that the format and contents will provide a compreheve introduction to the subject and enable the reader to achieve rapid and meaningful results. The optimum thermal design of a shell and tube heat exchanger and its involves the consideration of many interacting design parameters. Shell and Tube Heat Exchangers Advantages: 1.Its compact design 2.Less expensive 3.Higher operating temperatures and pressures in systems. 4.Pressure drop across a tube cooler is less 5.Tube leaks are easily located and plugged 6.Tubular coolers in refrigeration system can act as receiver also. 7.Most versatile in terms of types of service 8.Widest range of allowable design pressures and temperatures 9.Rugged mechanical construction Shell and Tube Heat Exchangers Process: 1. Process fluid assignments to shell side or tube side. 2. Selection of stream temperature specifications. 3. Setting shell side and tube side velocity limits. 4. Setting shell side and tube side pressure drop design limits. 5. Selection of heat transfer models and fouling coefficients for shell side and tube side. Software Design for Shell and Tube Heat Exchangers: Shell and Tube Heat Exchangers having lot software design and rating range values available including AspenBJAC, HTFS and CC-THERM, which insist the designer to make up the effects of many other attracting design and achieve optimum thermal design. These design packages are supported by extensive component physical property databases and thermodynamic models. It must be stressed that software convergence and optimisation routines will not necessarily achieve a practical and economic design without the designer forcing parameters in an intuitive way. It is recommended that the design be checked by running the model in the rating mode. It is the intention of this paper to provide the basic information and fundamentals in a concise format to achieve this objective. The paper is structured on Chemstations CC-THERM software which enables design and rating to be carried out within a total process model using CHEMCAD steady state modelling software. for more information Shell and Tube Heat Exchangers
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