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Evaporator Design

Evaporator Design
Unit tons/hr kg/s Summary Of Results
Flow rate of water m_w 1000 251.9958333333 Quantity Magnitude Units
T1 oC 7.22 Flow rate of water 251.9958333333 kg/s
T2 oC 12.78 Flow rate of R134a (m_R) 1276.6978287093 Kg/s
t1 oC 35 Q_in 5884.6067 KW
t2 oC 29.44 Provisional area (A) 675.459905877 m^2
Cp (R134a) Kj/kgC 0.829 OD 20 mm
Cp water) Kj/kgC 4.2 ID 16 mm
Molecular mass of R134a M_R (Kg/kmol) 102 Bundle Diameter (D_b) 1234.2143213183 mm
Molecular mass of water M_w (Kg/kmol) 18 Shell Diameter (D_s) 1312.2143213183 mm
Enthalpy of R134a @ Evaporator Exit KJ/Kg 257.699 Heat Transfer co-efficient (h_i) 826173.625072344 W/m2-oC
HEAT LOAD Heat Transfer co-efficient (h_o) 772.7403166757 W/m2-oC
Unit Overall Heat Transfer Co-efficient (U_o) 608.1229987152 W/m2-C
KW Q_in 5884.6067 Evaporator Heat Transfer 6506481.22302423 W
Kg/s Flow rate of R134a (m_R) 1276.6978287093 Enthalpy of R134a @ Compresser Exit 192.9701 KJ/Kg
oC ∆T_lm 16 Enthalpy of R134a @ Evaporator Entrance 100.865 KJ/Kg
R 1 Effectiveness (E) 0.7497749775
S 0.2001439885 q_max 29401.86585 KW
F_t 0.99 2 Shell and four tube passes For 1.25 triangular Pitch q_actual 22044.7833060756 KW
oC ∆T_m 15.84 K1 0.249
W/m2-C U 550 Assumed n1 2.207
m^2 Provisional area (A) 675.459905877
mm OD 20
mm ID 16
m L 4.83
m^2 Area of 1 tube 0.3034778503
Number of tubes (N_t) 2226
mm Bundle Diameter (D_b) 1234.2143213183
mm Bundle diametrical Clearance 78 For split ring floating head type
mm Shell Diameter (D_s) 1312.2143213183
Tube Side Co-efficient
ft/s Tube Velocity 8388.9307366637
oC R134a mean Temperature 10
mm^2 Tube Cross-sectional area 201.0619298297
Tubes Per pass 557
m^2 Total flow area 0.1119914949
kg/s-m^2 R134a mass velocity (G) 11399.9534489325
lb/hr-ft^2 R134a mass velocity (G) 8377521.79086186 Reynolds Number 12609843.9654462
C1 0.0009 Prandtl Number 0.9572519137
lb/hr-ft dynamic viscosity of R134a 0.0350784 Nussetl Number 1059478.98130206
ft-lb/Btu J 778
Btu/lb i_fg 177.16
lb-ft/lbf-s2 g_c 32.2
ft/s2 g 32.144
n 0.5
∆x 1
Btu/ft-hr-F Thermal conductivity (K1) 0.0072558
Btu/hr-ft2-F Heat Transfer co-efficient (h_i) 145594.083191884
W/m2-oC Heat Transfer co-efficient (h_i) 826173.625072344
Shell Side Co-efficient
ft/s Shell Velocity 12.02352267
Number of Baffles 5
mm Baffle Spacing (l_B) 262.4428642637
mm Tube Pitch 25
m2 Cross-flow area (A_s) 0.068876257
lb/hr-ft^2 Mass Velocity of water (G) 2688662.62607671
mm Equivalent Diameter (d_e) 14.201
oC Mean Temperature 32.22
lb/hr-ft Viscosity of water 1935.36
C1 0.0009 Thermal Diffusivity (ft3/lb-hr) 8.3463706052
ft-lb/Btu J 778 Kinematic Viscosity (ft2/hr) 31.1572900937
Btu/lb i_fg 891.433 Nusselt Number 1133.8025073549
lb-ft/lbf-s2 g_c 32.2 Prandtl Number 3.7330345808
ft/s2 g 32.144 Reynolds Number 73.3514109297
n 0.5
ft ∆x 1
Btu/ft-hr-F Thermal conductivity (K1) 0.5201005
Btu/hr-ft2-F Heat Transfer co-efficient (h_o) 136.177692603
W/m2-oC Heat Transfer co-efficient (h_o) 772.7403166757
Overall Heat Transfer Co-efficient (U_o)
W/m-C K_w for tube wall material 50
W/m2-C Fouling coefficient for R134a (h_od) 5000
W/m2-C Fouling coefficient for water (h_id) 12000
W/m2-C Overall Heat Transfer Co-efficient (U_o) 608.1229987152 TRUE
Btu/hr-ft2-F Overall Heat Transfer Co-efficient (U_o) 107.1676916946

Condensor Design

Condensor Design
Unit tons/hr kg/s K pa Summary Of Results
Flow rate of water m_w 1000 251.9958333333 P (low) 100 Quantity Magnitude Units
T1 oC 29.44 P (High) 200 Flow rate of water 251.9958333333 kg/s
T2 oC 35 Flow rate of R134a (m_R) 1276.6978287093 Kg/s
t1 oC 12.78 Q_in 5884.6067 KW
t2 oC 7.22 Provisional area (A) 682.3523538961 m^2
Cp (R134a) Kj/kgC 0.829 OD 20 mm
Cp water) Kj/kgC 4.2 ID 16 mm
Molecular mass of R134a M_R (Kg/kmol) 102 Bundle Diameter (D_b) 1239.7264131098 mm
Molecular mass of water M_w (Kg/kmol) 18 Shell Diameter (D_s) 1315.7264131098 mm
Enthalpy of R134a @ condenser Exit KJ/Kg 100.865 Heat Transfer co-efficient (h_i) 818823.325916897 W/m2-oC
HEAT LOAD Heat Transfer co-efficient (h_o) 768.6204438527 W/m2-oC
Unit Overall Heat Transfer Co-efficient (U_o) 605.5635937108 W/m2-C
KW Q_in 5884.6067 Condensor Heat Transfer 6479097.41968525 W
Kg/s Flow rate of R134a (m_R) 1276.6978287093 Liquid Saturation Enthalpy of R134a @ Low P 17.2662653289 KJ/kg
oC ∆T_lm 16 Vapour Saturation Enthalpy of R134a @ Low P 234.4389186176 KJ/kg
R 1 Liquid Saturation Enthalpy of R134a @ High P 38.4233767079 KJ/kg
S 0.3337334934 Vapour Saturation Enthalpy of R134a @ High P 244.4517436565 KJ/kg
F_t 0.98 2 Shell and four tube passes For 1.25 triangular Pitch Effectiveness (E) 0.7998560115
oC ∆T_m 15.68 K1 0.249 q_max 17632.65245 KW
W/m2-C U 550 Assumed n1 2.207 q_actual 14103.5830611591 KW
m^2 Provisional area (A) 682.3523538961
mm OD 20
mm ID 16
m L 4.83
m^2 Area of 1 tube 0.3034778503
Number of tubes (N_t) 2248
mm Bundle Diameter (D_b) 1239.7264131098
mm Bundle diametrical Clearance 76 For split ring floating head type
mm Shell Diameter (D_s) 1315.7264131098
Tube Side Co-efficient
ft/s Tube Velocity 8314.2961215689
oC R134a mean Temperature 32.22
mm^2 Tube Cross-sectional area 201.0619298297
Tubes Per pass 562
m^2 Total flow area 0.1129968046 Reynolds number 12497656.7415543
kg/s-m^2 R134a mass velocity (G) 11298.5303755434 Prandtl Number 0.9572519137
lb/hr-ft^2 R134a mass velocity (G) 8302988.67884352 Nussetl Number 1050053.01171752
C1 0.0009
lb/hr-ft dynamic viscosity of R134a 0.0350784
ft-lb/Btu J 778
Btu/lb i_fg 177.16
lb-ft/lbf-s2 g_c 32.2
ft/s2 g 32.144
n 0.5
∆x 1
Btu/ft-hr-F Thermal conductivity (K1) 0.0072558
Btu/hr-ft2-F Heat Transfer co-efficient (h_i) 144298.762167045
W/m2-oC Heat Transfer co-efficient (h_i) 818823.325916897
Shell Side Co-efficient
ft/s Shell Characteristic Velocity 11.9594191371
Number of Baffles 5
mm Baffle Spacing (l_B) 263.145282622
mm Tube Pitch 25 Thermal Diffusivity 8.3463706052
m2 Cross-flow area (A_s) 0.0692454398 Reynolds number 72.9603371396
lb/hr-ft^2 Mass Velocity of water (G) 2674327.99406083 Prandtl Number 3.7330345808
mm Equivalent Diameter (d_e) 14.201 Nussetl Number 13.7508955296
oC Mean Temperature 10
lb/hr-ft Viscosity of water 1935.36
C1 0.0009
ft-lb/Btu J 778
Btu/lb i_fg 891.433
lb-ft/lbf-s2 g_c 32.2
ft/s2 g 32.144
n 0.5
ft ∆x 1
Btu/ft-hr-F Thermal conductivity (K1) 0.5201005
Btu/hr-ft2-F Heat Transfer co-efficient (h_o) 135.451659856
W/m2-oC Heat Transfer co-efficient (h_o) 768.6204438527
Overall Heat Transfer Co-efficient (U_o)
W/m-C K_w for tube wall material 50
W/m2-C Fouling coefficient for R134a (h_od) 5000
W/m2-C Fouling coefficient for water (h_id) 12000
W/m2-C Overall Heat Transfer Co-efficient (U_o) 605.5635937108 TRUE
Btu/hr-ft2-F Overall Heat Transfer Co-efficient (U_o) 106.7166554289

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