Page 160 - Chemical process engineering design and economics
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Process Circuit Analysis 143
C T total cost
d constant in the heat-capacity equation or pipe diameter
F degrees of freedom
f friction factor or function of
g acceleration of gravity
h enthalpy or heat-transfer coefficient
Ah R enthalpy of reaction
Ah VR enthalpy of vaporization at a reference temperature
Ahyw enthalpy of vaporization at the wet bulb temperature
k mass-transfer coefficient
K degrees Kelvin or phase equilibrium constant or constant of integration
K P chemical equilibrium constant
m molar flow rate or mass flow rate
N number of moles
p partial pressure or vapor pressure
P property or total pressure
Q heat transferred or volumetric flow rate
R gas constant or number of relationships (tabular, graphical or algebraic)
Re Reynolds group
t temperature or time
t P temperature of the process fluid
t R reference temperature
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