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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Lamella heat exchangers,
Types of Heat Exchangers and Their Applications
Laminar flow: Laminar flow control, of boundary layers, Lancaster, J F, Langelier index for water quality, Large eddy simulation, in prediction of turbulent boundary layers, Laws for turbulent flows: Layers of fluid, free convection heat transfer in, Le Fevre equations for free convective heat transfer, Leakage between streams, in shell-and-tube heat exchangers Leakage effects, on heat transfer and pressure drop in shell-and-tube heat exchangers, Leaks, in heat exchanger, sealing by explosive welding, Lebedev, M E, Lee and Kesler equation, for vapour pressure, L-footed fins, Lessing rings, characteristic of, as packings for fixed beds, Li equation, for critical temperature of mixtures, Lienhard and Dhir analysis of critical heat flux in pool boiling, Lienhard and Eichhorn criterion, for transition in critical heat flux mechanism in crossflow over single tube, Lift force: Liley, P E, Limb, D, Limpet coils: Linnhoff, B, Liquefaction, exergy analysis of, Liquid fluidized beds, Liquid fuels, properties of, Liquid hold-up, Liquid-liquid-gas flow, Liquid-liquid flow, Liquid metals: Liquid sheets, in direct contact heat transfer, Liquid-solid interfaces, fouling at, Liquids: Lister, D H, Local conditions hypothesis, for critical heat flux in flow boiling, Lockhart and Martinelli correlations: Lodge's rubberlike liquid (non-Newtonian), Logarithmic law region, Logarithmic mean temperature difference Longitudinal flow and heat transfer in tube banks, Long-tube vertical evaporator, Loss coefficient, Lost work in unit operations/exergy analysis, Louvered fins, in plate fin exchangers, Low-alloy steels: Low-finned tubes: Low-nickel steels, Lubricants, physical properties: Lucas methods

Index

HEDH
A B C D E F G H I J K L
Lamella heat exchangers,
Types of Heat Exchangers and Their Applications
Laminar flow: Laminar flow control, of boundary layers, Lancaster, J F, Langelier index for water quality, Large eddy simulation, in prediction of turbulent boundary layers, Laws for turbulent flows: Layers of fluid, free convection heat transfer in, Le Fevre equations for free convective heat transfer, Leakage between streams, in shell-and-tube heat exchangers Leakage effects, on heat transfer and pressure drop in shell-and-tube heat exchangers, Leaks, in heat exchanger, sealing by explosive welding, Lebedev, M E, Lee and Kesler equation, for vapour pressure, L-footed fins, Lessing rings, characteristic of, as packings for fixed beds, Li equation, for critical temperature of mixtures, Lienhard and Dhir analysis of critical heat flux in pool boiling, Lienhard and Eichhorn criterion, for transition in critical heat flux mechanism in crossflow over single tube, Lift force: Liley, P E, Limb, D, Limpet coils: Linnhoff, B, Liquefaction, exergy analysis of, Liquid fluidized beds, Liquid fuels, properties of, Liquid hold-up, Liquid-liquid-gas flow, Liquid-liquid flow, Liquid metals: Liquid sheets, in direct contact heat transfer, Liquid-solid interfaces, fouling at, Liquids: Lister, D H, Local conditions hypothesis, for critical heat flux in flow boiling, Lockhart and Martinelli correlations: Lodge's rubberlike liquid (non-Newtonian), Logarithmic law region, Logarithmic mean temperature difference Longitudinal flow and heat transfer in tube banks, Long-tube vertical evaporator, Loss coefficient, Lost work in unit operations/exergy analysis, Louvered fins, in plate fin exchangers, Low-alloy steels: Low-finned tubes: Low-nickel steels, Lubricants, physical properties: Lucas methods
M N O P Q R S T U V W X Y Z
L Lamella heat exchangers,
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Types of Heat Exchangers and Their Applications

DOI 10.1615/hedhme.a.000238

3.1 INTRODUCTION TO HEAT EXCHANGER DESIGN
3.1.2 Types of heat exchangers and their applications

Kenneth J. Bell

A. Selection of a basic type of heat exchanger

The most important decision underlying design of a piece of heat transfer equipment is the selection of the basic type of equipment to be specified and designed for a given application. It is incumbent upon the designer, at a very early stage in the design process, to survey the range of basic equipment types available and to select the one most applicable to his or her particular process. If a clear-cut decision cannot be made, it will probably prove economically desirable to proceed with at least first-stage design on each type of equipment that may reasonably serve.

A consideration that often enters into the selection of a basic type is the availability of comprehensive and accurate design methods for that equipment. Thus, shell-and-tube exchangers, for which a generally very good design procedure is available, are often selected for a service in preference to another type that may be intrinsically preferable in the application but which lacks a comparable design method in which the designer may place confidence. There is justification for this philosophy, but it can be bought at too high a price. Most heat exchanger types have good design methods available for most applicable services, though the best methods are often proprietary to the manufacturers or to members of cooperative research organizations.

B. Double-pipe heat exchangers

A typical double-pipe heat exchanger is shown in Figure 1. Essentially, it consists of one pipe placed concentrically inside another one of larger diameter, with appropriate end fittings on each pipe to guide the fluids from one section to the next. The inner pipe may have longitudinal fins welded, brazed, or soldered to it either internally or externally to increase the heat transfer area for the fluid with the lower heat transfer coefficient. The double-pipe sections can be connected in various series or parallel arrangements for either fluid to meet pressure drop limitations and MTD requirements. The major use of double-pipe exchangers is for sensible heating or cooling of the process fluid where small heat transfer areas (typically up to 50 m2) are required. They may also be used for small amounts of boiling or condensation on the process fluid side.

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