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Condener m2

This document provides specifications for a condenser, including mass flow rates and temperatures of the vapour and cooling fluids, physical properties, heat transfer coefficients, pressure drops, and dimensions. The condenser uses a shell and tube design with 45,000 kg/h of vapour flowing through tubes and a cooling fluid flowing on the shell side. Key specifications and results include an overall heat transfer coefficient of 788.94 W/m2°C, a shell side pressure drop of 135.63 kPa, and a tube side pressure drop of 76,109.86 Pa.

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yamen-691904
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137 views6 pages

Condener m2

This document provides specifications for a condenser, including mass flow rates and temperatures of the vapour and cooling fluids, physical properties, heat transfer coefficients, pressure drops, and dimensions. The condenser uses a shell and tube design with 45,000 kg/h of vapour flowing through tubes and a cooling fluid flowing on the shell side. Key specifications and results include an overall heat transfer coefficient of 788.94 W/m2°C, a shell side pressure drop of 135.63 kPa, and a tube side pressure drop of 76,109.86 Pa.

Uploaded by

yamen-691904
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLSX, PDF, TXT or read online on Scribd
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Condenser

Mass flow of vapour = 45000 kg/h


Operating pressure of codenser = 10 bar
Vapour inlet temperature, T 1 = 60 deg C
Vapour outlet temperature, T 2 = 45 deg C
Avg mol wt of the vapour = 52 kg/kgmole
Enthalpy of vapour = 596.5 kJ/kg
Enthalpy of condensate = 247 kJ/kg
cooling fluid inlet temperature, t 1 = 30 deg C
Cooling fluid outlet temperature, t 2 = 40 deg C
Heat capacity of cold fluid = 4.18 kJ/kg deg C
Overall heat transfer coefficient, U assumed = 900 W/m2 deg K
Tube OD = 20 mm
Tube ID = 16.8 mm
Tube length = 4.88 m
Pitch = 1.25 square pitch
Constants for bundle dia, K1 = 0.158
Constants for bundle dia, n1 = 2.263
Shell side coefficient, ho = 1500
Physical properties at mean condensate temp
Viscosity of condensate, µL = 0.16 mNs/m2
Density of condensate, ρL = 551 kg/m3
Conductivity of condensate, kL = 0.13 W/m deg C
Universal gas constant, R = 0.08206 m3atm/kmolK
Gravitational constant, g = 9.81 m/s2
Density of cooling media at mean tube temp = 993 kg/m3
Viscosity of cooling media, µ = 0.8 mNs/m2
Thermal conductivity of cooling media, k f = 0.59 W/m2 deg C
heat capacity of cooling media = 4.2 kJ/kg deg C
Fauling factor, cold fluid = 6000 W/m deg C
Fauling factor, condencing fluid side = 6000 W/m deg C
Thermal conductivity tube, kw = 50 W/m2 deg C
Baffle spacing = 45 %
Vapour viscosity = 0.008 mNs/m2
Viscosity of water = 0.6 mNs/m2

Heat Load
Heat transferred from vapor = 4368.75 kW
Cooling fluid flow = 104.5155502 kg/s
ΔTlm = 17.38029748 deg C

Dimensionless temperature ratio, R = 1.5


Dimensionless temperature ratio, S = 0.333333333

LMTD correction factor = 0.91


Corrected LMTD = 15.82442375 deg C

Trial area = 306.7515598 m2


Surface area of one tube = 0.306619443 m2
No of tubes = 1000.430882
Bundle diameter = 956.9582931 mm
Shell diameter = 1035 mm
Pitch = 25
No of tubes in centre row, Nr = 38.27833172

Shell side coefficient

Mean temperature, Shell = 52.5 deg C


Mean temperature, tube = 35 deg C
Wall temperature, Tw = 42 deg C
Mean temperature of condensate = 47 deg C
Vapour density at mean vapour temperature = 19.21 kg/m3
Vertical tube loading, condensate rate per = 0.0026 kg/sm
unit tube perimeter, Гh
Average no of tubes in a vertical tube row, N r = 26
Mean condensate for tube bundle h c = 1377.961661 W/m2 deg C

Tube side coefficient

Tube side c/s area = 0.055 m2


Tube velocity = 1.90 m/s
Reynolds number, Re = 39588.10042
Prandtl number, Pr = 5.694915254
L/di = 290.4761905
Heat transfer factor from Fig 12.23 RC6, j h = 0.0034
Inside heat transfer coefficient, h i = 8392.61127 W/m2 deg C

Overall coefficient
1/U = 0.001267508
Overall coefficient = 788.9498014

Shell side delta P

Clearance = 95 (from fig 12.10, pull throu


Shell id = 1130 mm

Cross flow area = 0.26 m2


Mass flowrate = 48.95 kg/sm2
Equivalent mean diameter = 19.75 mm

Re = 120827.9
From Fig 12.24 = 0.0022 (From Fig 12.24 for Re = 1
Mass velocity = 2.55 m/s

delta P (Shell side) = 135.6313485 kPa

Tube side delta P

Re = 52784.13389
jf = 0.0035

tube side delta P = 76109.85814


kg/kgmole

kJ/kg deg C
W/m2 deg K

square pitch

W/m deg C
m3atm/kmolK

W/m2 deg C
kJ/kg deg C
W/m deg C
W/m deg C
W/m2 deg C
W/m2 deg C

W/m2 deg C
(from fig 12.10, pull through floating head)

(From Fig 12.24 for Re = 121000)

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