Category Archives for Heat Exchangers

Heat Recovery Unit

In the interest of energy conversion, process heat can be obtained from a heat recovery unit in which heat is recovered from turbine or reciprocating engine exhaust. In a heat recovery unit, an exhaust gas flows over finned tubes carrying … Continue reading

15. September 2009 by Jack
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Fired Heater

Direct-fired combustion equipment is that in which the flame and/or products of combustion are used to achieve the desired result by radiation and convection. Common examples include rotary kilns and open-hearth furnaces. Indirect-fired combustion equipment is that in which the … Continue reading

15. September 2009 by Jack
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Aerial Coolers – #2

Process outlet temperature in an aerial cooler can be controlled by louvers, fan variable speed drives, blade pitch or recirculation of process fluid. As the process flow rate and heat duties change, and as the temperature of the air changes … Continue reading

15. September 2009 by Jack
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Aerial Coolers – #1

Aerial coolers are often used to cool a hot fluid to near ambient temperature. They are mechanically simple and flexible, and they eliminate the nuisance and cost of a cold source. In warm climates, aerial coolers may not be capable … Continue reading

15. September 2009 by Jack
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Plate and Frame Exchangers

Plate-and-frame exchangers are an arrangement of gasketed, pressed metal plates aligned on carrying bars and secured between two covers by compression bolts. The pressed metal plates are corrugated in patterns to provide increased surface area, to direct the flow in … Continue reading

15. September 2009 by Jack
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Double Pipe Exchangers

A double-pipe exchanger is made up of one pipe containing the tube fluid concentric with another pipe, which serves as the shell. The tube is often finned to give additional surface area. The double-pipe exchanger was developed to fit applications … Continue reading

15. September 2009 by Jack
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Shell and Tube Heat Exchanger Sizing

The required heat duty, film coefficients, conductivity, etc. for a shelland-tube heat exchanger can be calculated using the procedures in Heat Transfer Theory, Approximate U-values are given in Table 2-8. In the basic heat transfer equation it is necessary to … Continue reading

15. September 2009 by Jack
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TEMA Glasses and Tube Materials

TEMA standards provide for two classes of shell and tube exchanger qualities. Class C is the less  stringent and is typically used in onshore applications and where the temperature is above ~20°F. Class R is normally used offshore and in … Continue reading

15. September 2009 by Jack
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Heat Exchanger Placement of Fluid

The question always comes up of which fluid to put in the tubes and which fluid to put in the shell. Consider placing a fluid through the tubes when: 1. Special alloy materials are required for corrosion control and high … Continue reading

14. September 2009 by Jack
Categories: Shell and Tube Exchangers | Tags: | Leave a comment

Heat Exchanger Selection of Types

In selecting an exchanger, one must know the advantages and disadvantages of each type. The three basic types of shell-and-tube exchangers are fixed tube sheet, floating head, and U-tube. Table 3-1 summarizes the comparison between these three exchangers.

14. September 2009 by Jack
Categories: Shell and Tube Exchangers | Leave a comment

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