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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
Wadekar, V Wagner equation, for vapour pressure, Wake, Coles law of the, Wall layer transmissivity, Wall temperature: Wallis correlations: Wallis criterion, for transition from stratified to annular flow, applications in condensation, Walz' method, for laminar boundary layers, Waste heat boilers, Waste water, fouling by, Water: Watertube boiler, Wavelengths, of blackbody radiation, Waves, interfacial, effect on film condensation on vertical surface, Wavy fins, in plate fin exchangers, Webb, D R Webb, R L Weber, M, Weber number, Weil, C J Welded channel head, in shell-and tube heat exchanger, Welded fins: Welded plate exchangers: Welding: Welds: Wentz and Thodos equation, for fixed-bed pressure drop, Wet-bulb temperature,
Layout and Performance Data
Wettability, of surface, effect on pool boiling, Whalley and Hewitt correlations: White-Metzner model, for non-Newtonian fluid, Wicks, for heat pipes: Wilday, A J Wildsmith, G, Wills-Johnson flow stream analysis method for segmentally baffled shell-and-tube heat exchangers, Wilson, D I Window zone, in shell-and-tube heat exchangers: Winter, H H, Wire matrix inserts, in heat exchangers, Wirth, K E, Wispy annular flow, regions of occurrence of, Work (in exergy analysis) Working fluid, selection of for heat pipe,

Index

HEDH
A B C D E F G H I J K L M N O P Q R S T U V W
Wadekar, V Wagner equation, for vapour pressure, Wake, Coles law of the, Wall layer transmissivity, Wall temperature: Wallis correlations: Wallis criterion, for transition from stratified to annular flow, applications in condensation, Walz' method, for laminar boundary layers, Waste heat boilers, Waste water, fouling by, Water: Watertube boiler, Wavelengths, of blackbody radiation, Waves, interfacial, effect on film condensation on vertical surface, Wavy fins, in plate fin exchangers, Webb, D R Webb, R L Weber, M, Weber number, Weil, C J Welded channel head, in shell-and tube heat exchanger, Welded fins: Welded plate exchangers: Welding: Welds: Wentz and Thodos equation, for fixed-bed pressure drop, Wet-bulb temperature,
Layout and Performance Data
Wettability, of surface, effect on pool boiling, Whalley and Hewitt correlations: White-Metzner model, for non-Newtonian fluid, Wicks, for heat pipes: Wilday, A J Wildsmith, G, Wills-Johnson flow stream analysis method for segmentally baffled shell-and-tube heat exchangers, Wilson, D I Window zone, in shell-and-tube heat exchangers: Winter, H H, Wire matrix inserts, in heat exchangers, Wirth, K E, Wispy annular flow, regions of occurrence of, Work (in exergy analysis) Working fluid, selection of for heat pipe,
X Y Z
W Wet-bulb temperature,
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Layout and Performance Data

DOI 10.1615/hedhme.a.000332

3.13.3 Layout and performance data

E. U. Schlünder

A. The Mollier chart

In most cases the drying agent is air. During the drying process, heat is transferred from the air to the product while vapor is transferred from the product to the air. This combined transfer process of heat and mass leads to a change of enthalpy as well as of the vapor concentration of the drying agent. It is convenient to depict those changes in an enthalpy concentration chart for the drying agent, the so-called Mollier chart for humid air as shown in Figure 1 [see also Krischer and Kast (1978)].The enthalpy of the humid air is defined as

\[\label{eq1} h=c_{p,\rm{air}}T+X\left(\Delta h^{0}_v+c_{p,\rm{vapor}}T\right)\tag{1}\]

Figure 1 Mollier chart for humid air at constant total pressure (Krischer and Kast, 1978)

cp,air (in J/kg dry air K) is the specific enthalpy of the dry air, cp,vapor is that of the pure vapor. Δhv0, in joules per kilogram, is the standard latent heat of vaporization at 0 °C, X is the vapor content in kilograms vapor/kilogram dry air or the absolute humidity, T is the temperature in degrees celsius, and h is the enthalpy of the humid air in joules per kilogram dry air. 𝜑 in Figure 1 is the relative humidity, which is equal to the ratio of the partial vapor pressure pv to the saturation vapor pressure at a given temperature pv*(T). The absolute humidity can be calculated from the partial vapor pressure pv and the total pressure p:

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