compressibility factor


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compressibility factor

[kəm‚pres·ə′bil·əd·ē ‚fak·tər]
(thermodynamics)
The product of the pressure and the volume of a gas, divided by the product of the temperature of the gas and the gas constant; this factor may be inserted in the ideal gas law to take into account the departure of true gases from ideal gas behavior. Also known as deviation factor; gas-deviation factor; supercompressibility factor.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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The committee suggested problem of excessive billing due to gross calorific value (GCF) and super compressibility factor (SCF) to industries in KPK be solved on a prioritized basis, reported Business Recorder.
where u is the Darcy velocity of gas flow in reservoirs, k is the diagonal permeability tensor, p is the pressure, [rho] is the density of gas, [mu] is the dynamic viscosity of gas, [phi] is the porosity of porous media, q is the injection or production rate, W is the molecular weight of gas, R is the universal gas constant, T is the temperature of gas, and Z is the compressibility factor of gas.
where [DELTA][n.sub.H] is the moles of methane consumed at time, t, [V.sub.g] is the volume of the gas inside the reactor, [P.sub.i] is the pressure at the start of hydrate formation, [Z.sub.i] is the compressibility factor at the start of hydrate formation, R is the ideal gas constant, T is the average temperature of the gas during hydrate formation experiment, [P.sub.t] is the pressure of the reactor at t, and [Z.sub.t] is the compressibility factor of the gas in the reactor at t.
Thus, the compressibility factor Z is introduced to modify the gas state equation [10]:
Racket compressibility factor (ZRA), can be calculated as:
1 can be rewritten as a cubic polynomial of the compressibility factor, defined as Z = PV/(RT).
EXTRACT FROM ASPEN TOTAL BALANCE MOLE (KMOL/HR) 1.0000 MASS (KG/HR) 12.6237 ENTHALPY (GCAL/HR) 0.199420E-O1 *** INPUT DATA *** ISENTROPIC CENTRIFUGAL COMPRESSOR OUTLET PRESSURE BAR 7.09275 ISENTROPIC EFFICIENCY 0.50000 MECHANICAL EFFICIENCY 1.00000 *** RESULTS *** INDICATED HORSEPOWER REQUIREMENT KW 3.70548 BRAKE HORSEPOWER REQUIREMENT KW 3.70548 NET WORK REQUIRED KW 3.70548 POWER LOSSES KW 0.0 ISENTROPIC HORSEPOWER REQUIREMENT KW 1.85274 EFFICIENCY (POLYTR/ISENTR) USED 0.50000 OUTLET VAPOR FRACTION 1.00000 HEAD DEVELOPED, METER 53,877.8 MECHANICAL EFFICIENCY USED 1.00000 INLET HEAT CAPACITY RATIO 1.32138 INLET VOLUMETRIC FLOW RATE, CUM/HR 26.7815 OUTLET VOLUMETRIC FLOW RATE, CUM/HR 7.86288 INLET COMPRESSIBILITY FACTOR 0.99724 OUTLET COMPRESSIBILITY FACTOR 1.00047 AV.
The processor is able to calculate fluid properties such as temperature, pressure, specific molar enthalpy and entropy, energy flow, molecular weight, and compressibility factor. Custom compounds, such as heavier fractions, can also be defined.
Compressibility Factor. The compressibility factor Z = [bar.p]v/[bar.R]T for moist air results from the following equation:
For the compressibility factor, Z = [p/([rho]RT)], this becomes
The physical part of the compressibility factor [Z.sup.ph] considers the molecules in their monomeric non-associating state and can be expressed by an ordinary cubic equation of state with the parameters obtained for monomeric non-associating state.
A numerical friendly form of Redlich-Kwong cubic equation [14] of state in compressibility factor, Z, is used to model nonideal gas behavior.