Condensation analysis for plate-frame heat exchangers Page: 1 of 9
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CONDENSATION ANALYSIS FOR
PLATE-FRAME HEAT EXCHANGERS
Thomas J. Rabas
Energy Systems Division
Argonne National Laboratory
9700 South Cass Avenue
Argonne, Illinois 60439-4815
A theoretical analysis is presented to predict single-
component and binary-mixture condensation in plate-frame
heat exchangers. A thermodynamic property model based
on the Peng-Robinson equation of state was developed for
the binary-mixture equilibrium and formulated into a per-
formance prediction program. A set of equations was for-
mulated and a calculation algorithm was developed to pre-
dict the local rate of heat and mass transfer for binary mix-
tures. Friction-factor and heat-transfer-coefficient correla-
tions were developed using experimental data obtained with
ammonia condensation. The role of the mass-transfer resis-
tance associated with the condensation process were ana-
lyzed for a propane/butane mixture using two limiting
cases: (1) no liquid-phase mass-transfer resistance, and (2)
infinite liquid-phase mass-transfer resistance. The results
show that the vapor-phase mass-transfer resistance is the
controlling mechanism for binary-mixture condensation.
a empirical coefficient in Equation 1
A transfer area [m2]
b empirical coefficient in Equation 1
c empirical coefficient in Equation 7
c specific heat [J/kgK]
empirical coefficient in Equation 10
dh hydraulic diameter [m]
D12 molecular diffusivity [m2/s]
e empirical coefficient in Equation 10
f friction factor or empirical coefficient in Eqn. 10
g gravitational constant [m/s2]
h enthalpy per unit mass [J/kg]
h heat-transfer coefficient [W/m2K]
k thermal conductivity [W/mK]
k mass-transfer coefficient [kmol/m2s]
1 Current address is Praxair, Inc., Praxair Technical Center,
175 East Park Drive, Tonawanda, NY 14151-0044.
DISTRIUTON OF THIS DOct 44ENT IS UNLIMITED
mass flow rate [kg/s]
interface mass flux [kmol/m2s]
Nusselt number, hdh/k
Prandtl number, c jtk
wall heat flux [WI'm2]
wall resistance [m2s/W]
Reynolds number, pdhau/p
Schmidt number, p/pD12
Sherwood number, kdID2
liquid mole fraction
mass quality, i/ii,
Martinelli parameter defined by Equation 6
vapor mole fraction
plate width [m]
axial coordinate [m]
S plate displacement (plate draw depth) [m]
9p void fraction
9 viscosity [kg/ms]
p density [kg/m3]
Ahva, enthalpy of vaporization
Ap pressure drop [N/in2]
two-phase friction multiplier
high mass-flux correction
g vapor phase or static head
h heat transfer
k mass transfer
l liquid phase
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Arman, B. & Rabas, T.J. Condensation analysis for plate-frame heat exchangers, article, July 1, 1995; Illinois. (digital.library.unt.edu/ark:/67531/metadc794173/m1/1/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.