Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

One-pass tube-side exchangers

Single-pass Tube Side. For these conditions, no baffle is in either the head or the return end of the unit. The tube-side fluid enters one end of the exchanger and leaves from the opposite end. In general, these baffles are not as convenient from a connecting pipe arrangement viewpoint as units with an even number of passes in which the tube-side fluid enters and leaves at the same end of the exchanger. See Figures 10-IC and 10-lG and Table 10-1. [Pg.25]

Mean-temperature-difference (MTD) correction factor. When the outlet temperatures of both fluids are identical, the MTD correction factor for a 1 2 shell-and-tube exchanger (one pass shell side, two or more passes tube side) is approximate 0.8. For a single-pass aircooled heat exchanger the factor is 0.91. A two-pass exchanger has a factor of 0.96, while a three-pass exchanger has a factor of 0.99 when passes are arranged for counterflow. [Pg.1250]

Shell-and-tube exchangers contain several types of baffles to help direct the flow of both tube-side and shelbside fluids. Pass partition baffles force the fluid to flow through several groups of parallel tubes. Each of these groups of tubes is called a pass, . since it passes the fluid from one head to another. By adding pass partition baffles on each end. the tube-side fluid can be forced to take as many passe.s through the exchanger as desired. [Pg.49]

Eor one shell and multipass on the tube side, it is obvious that the fluids are not in true counter-current flow (nor co-current). Most exchangers have the shell side flowing through the unit as in Eigure 10-29C (although some designs have no more than two shell-side passes as in Eig-ures 10-IJ and 10-22, and the tube side fluid may make two or more passes as in Eigure 10-IJ) however, more than two passes complicates the mechanical construction. [Pg.55]

Most boiler plants with electrical power generating facilities employ surface condensers. These are shell-and-tube heat exchangers in either one-, two-, or four-pass configurations. Surface condensers typically receive cooling water on the tube-side and steam on the shell-side of the heat exchanger. The LP turbine steam generally is received at the top of the condenser and proceeds through the condenser in a downward flow, while the FW turbine exhaust steam enters at the side. [Pg.116]

In these designs there is one pass for the fluid on the shell-side and a number of passes on the tube-side. It is often an advantage to have two or more shell-side passes, although this considerably increases the difficulty of construction and, very often therefore, several smaller exchangers are connected together to obtain the same effect. [Pg.505]

In an exchanger with one shell pass and several tube-side passes, the fluids in the tubes and shell will flow co-currently in some of the passes and countercurrently in the others. For given inlet and outlet temperatures, the mean temperature difference for countercurrent flow is greater than that for co-current or parallel flow, and there is no easy way of... [Pg.510]

The required heat-transfer area of 19.5 m2 is based on an overall heat-transfer coefficient of 102 W/(m2 K). The best exchanger geometry for this application includes six internal baffles, one shell-side pass and two tube-side passes. The shell is fabricated from standard carbon steel piping of nominal pipe size 30, schedule number 80. The 112 tubes required are each 1.83 m long and 38.1 mm (1.5 in.) o.d. (BWG 12). The tubes must be fabricated from stainless steel type 250 for reasons of temperature tolerance. [Pg.190]

If the total number of tubes is n, there are n/2 tubes in one pass on the oil side, that is the oil passes through 2 tubes in traversing the exchanger. [Pg.150]

A shell-and-tube heat exchanger has condensing steam at 00°C in the shell side with one shell pass. Two tube passes are used with air in the tubes entering at 10°C. The total surface area of the exchanger is 30 m2 and the overall heat-trartSftr coefficient may be taken as 150 W/m2 °C. If the effectiveness of the exchanger is 85 percent, what is the total heat-transfer rate ... [Pg.574]

A shell-and-tube heat exchanger with one shell pass and two tube passes is used to heat 5.0 kg/s of water from 30°C to 80°C. The water flows in the tubes. Condensing steam at 1 atm is used in the shell side. Calculate the area of the heat exchanger, if the overall heat-transfer coefficient is 900 W/m2 - °C. Suppose this same exchanger is used with entering water at 30°C, U = 900, but with a water flow rate of 1.3 kg/s. What would be the exit water temperature under these conditions ... [Pg.578]

A shell-and-tube heat exchanger with one shell pass and four tube passes is designed to heat 4000 kg/h of engine oil from 40°C to 80°C with the oil in the tube side. On the shell side is condensing steam at 1-atm pressure, and the overall heat-transfer coefficient is 1200 W/m2 °C. Calculate the mass flow of condensed steam if the flow of oil is reduced in half while the inlet temperature and U value are kept the same. [Pg.578]

For shell-and-tube heat exchangers with cross-flow baffles, the preceding methods assume that an adequate number of baffles has been provided. If the shell-side fluid makes less than eight passes across the tube bundle, the mean temperature difference may need to be corrected for this cross-flow condition. Appropriate curves are presented in Caglayan and Buthod [20]. The curves in this reference may also be used to determine correction factors for cross-flow exchangers with one shell pass and more than two tube passes. [Pg.286]


See other pages where One-pass tube-side exchangers is mentioned: [Pg.231]    [Pg.329]    [Pg.261]    [Pg.231]    [Pg.329]    [Pg.261]    [Pg.1240]    [Pg.418]    [Pg.373]    [Pg.1072]    [Pg.1077]    [Pg.695]    [Pg.550]    [Pg.844]    [Pg.647]    [Pg.179]    [Pg.199]    [Pg.317]    [Pg.160]    [Pg.542]    [Pg.602]    [Pg.605]    [Pg.612]    [Pg.648]    [Pg.895]    [Pg.900]    [Pg.167]    [Pg.160]    [Pg.646]    [Pg.179]    [Pg.199]    [Pg.342]   
See also in sourсe #XX -- [ Pg.329 ]

See also in sourсe #XX -- [ Pg.261 ]




SEARCH



Tube exchangers

© 2024 chempedia.info