Shell and tube designation

A common method of describing an exchanger is to designate the number of shell and tube passes ni/n where m is the number of shell passes and n the number of tube passes. 

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Figure 10-96B. Horizontal thermosiphon reboiler on distillation column shell and tube design, not kettle. Boiling in shell.

Any of various types of heat transfer equipment, whereby relatively cold water flowing over a surface will, by conduction and convection means, transfer heat away from a process. The most common types of heat exchangers are plate and frame and shell and tube designs. A boiler is also a type of heat exchanger. 

Add identical reactors in parallel. The shell-and-tube design used for heat exchangers is a common and inexpensive way of increasing capacity. 

Parallel—put 128 identical tubes in parallel using a shell-and-tube design. The total length of tubes will be 1536 ft, but they are compactly packaged. All operating conditions are identical on a per-tube basis to those used in the pilot plant. 

The above computation is quite fast. Results for the three ideal reactor t5T)es are shown in Table 6.3. The CSTR is clearly out of the running, but the difference between the isothermal and adiabatic PFR is quite small. Any reasonable shell-and-tube design would work. A few large-diameter tubes in parallel would be fine, and the limiting case of one tube would be the best. The results show that a close approach to adiabatic operation would reduce cost. The cost reduction is probably real since the comparison is nearly apples-to-apples. ... 

The most important alternatives to shell-and-tube designs are ... 

Are the heat exchangers of a plate and frame design or a shell and tube design If a shell and tube, then, apart from questions relating to the dimensions, flow rates, metallurgy, age, process medium, etc., it will be pertinent to ask many other questions, including the following ... 

The feed-effluent heat exchanger is assumed to be single-pass, countercurrent shell-and-tube design. Three partial differential equations are used for the temperatures of gas on tube side, gas on shell side, and the tube metal Eqs. (6.11), (6.12), and (6.13), respectively. The overall heat transfer coefficients on both tube and shell sides, U, and U are constant and are equal to 0.284 kJ s-1 m-2 K-1. Equal heat transfer area per volume is assumed for the shell and tube sides (A,/V, = As/Vs) and is 157 m2/m3, based... 

Related Calculations. Figure 19.17 is valid for condensers of shell-and-tube design, employing cooling water at 85°F. This example is adapted from Vacuum Dryers, Chem. Eng., January 17,1977. 

The most commonly used heat exchangers are the coil and double pipe for small heat-exchange areas and the shell-and-tube design for large areas. Devore et al. [13] recommend that if ... 

Add identical reactors in parallel. This sets = S /, = 1 for each reactor. The number of reactors is A tube = -Sthroughput- The shell-and-tube design used for heat exchangers is a common and inexpensive way of increasing capacity by scaling in parallel. 

Scale in parallel, for example, shell-and tube designs. 

The CSTR is clearly out of the running, but the isothermal and adiabatic PFRs are a dead heat. Any reasonable shell-and-tube design would work. A few large-diameter tubes in parallel would be fine, but a single adiabatic reactor would probably be the best choice. 

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