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Vacuum equipment, operational problems of, Vacuum operation, of reboilers, Valle, A, Valves: Vaned bends, single-phase flow and pressure drop in, Vapor blanketing, as mechanism of critical heat flux, Vapor injection, effect of on boiling heat transfer in tube bundles, Vapor-liquid disengagement, in kettle reboilers, Vapor-liquid separation, for evaporators, Vapor mixtures, condensation of, Vapor pressure, Vapor recompression, in evaporation, Vaporization, choice of evaporator type for,
Choice of Type in plate-fin heat exchangers,
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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
Vacuum equipment, operational problems of, Vacuum operation, of reboilers, Valle, A, Valves: Vaned bends, single-phase flow and pressure drop in, Vapor blanketing, as mechanism of critical heat flux, Vapor injection, effect of on boiling heat transfer in tube bundles, Vapor-liquid disengagement, in kettle reboilers, Vapor-liquid separation, for evaporators, Vapor mixtures, condensation of, Vapor pressure, Vapor recompression, in evaporation, Vaporization, choice of evaporator type for,
Choice of Type in plate-fin heat exchangers,
Vaporizer, double bundle, constructional features, Vapors, saturation properties of, Vapors, properties of superheated, Vasiliev, L, Vassilicos, J C, Velocity defect law: Velocity distribution: Velocity fluctuations, in turbulent pipe flow, Velocity ratio (slip ratio): Venting of condensers Vertical condensers: Vertical cylindrical fired heater, Vertical pipes: Vertical surfaces: Vertical thermosiphon reboilers: Vessels of non-circular cross section, design to ASME VIII code, Vessels of rectangular cross section, EN13445 guidance for, Vetere method, for enthalpy of vaporisation, Vibrated beds, heat transfer to, Vibration: Vinyl acetate: Vinyl benzene: Vinyl chloride: Virial equation: Virk equation for maximum drag reduction, Visco-elastic fluids, flow of, Viscometric functions (non-Newtonian flow), methods of determining, Viscosity: Viscosity number (Vi), Viscous dissipation, influence on heat transfer in non-Newtonian flows, Viscous heat generation, in scraped sauce heat exchangers, Viscous sublayer, in duct flow, Void fraction, Voidage, in fixed beds, definition, Volumetric heat transfer coefficient, Volumetric mass transfer coefficient, von Karman friction factor equation for fully rough surface, von Karman velocity defect law, Vortex flow, in helical coils of rectangular cross section, Vortex flow model, for twisted tube heat exchangers, Vortex shedding:
W X Y Z
V Vaporization, choice of evaporator type for,
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Choice of Type

DOI 10.1615/hedhme.a.000273

3.5.5 Choice of Type

R. A. Smith, P. D. Hills

Some advice is given on which might be the best type of evaporator to use for a given duty. Types 1-12 refer to the twelve types listed in Section 524.

A. Vaporization

Under the heading of Vaporization are included evaporators for the revaporization of a liquefied gas and for obtaining a pure vapour from an impure liquid.

In many sectors of the industry, the vertical bayonet tube vaporiser type (2), shown in Figure 270.2 is the standard equipment for the revaporization of liquefied gases, either from ambient or sub-ambient conditions. Some manufacturers offer a range of standard designs with known capacities for many of the more common liquefied gases, such as butane, chlorine and sulphur dioxide. Note however, that if the revaporization is to take place at very low temperatures, any steam heated design may present problems with condensate freezing, and it may be necessary to resort to more specialized designs, such as indirect systems, electric heating etc. These are outside the scope of this section; advice should be sought from a specialist manufacturer.

The kettle type (1), [see Figure 270.1] is also suitable and commonly used for both liquefied gases and obtaining vapour from impure liquids, provided that in the latter case the liquid is relatively clean. The weir may be omitted for the former application, but in that case some form of level control will be necessary, as described in Section 270A.

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