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EVAPORATOR COIL SIZING Fin-and-Tube Heat Exchanger Design & Reverse Engineering
kW
W/K
K
W/m²K
A. Fluid Selection
Refrigerant
External Fluid
B. Thermal Load
Q_total kW
Q_sensible kW
Q_latent kW
C. Refrigerant Side
Evap. Temp °C
Inlet State Mode
x_out
P_sat
h_in (calc) kJ/kg
h_out (calc) kJ/kg
ρ_liq kg/m³
ρ_vap kg/m³
ṁ_ref kg/s
ṁ_ref kg/hr
V_ref m/s
h_i W/m²K
↑ h_i auto-calc via Shah (two-phase) or Gnielinski. Tube ID affects G → h_i.
Flow Regime
E. Materials
Tube Material
k_tube W/mK
Tube Thickness mm
Fin Material
k_fin W/mK
Fin Thickness mm
Bond Type
h_contact W/m²K
D. Air Side
Altitude m
P_atm kPa
Air On-Coil
T_db,in °C
RH_in %
W_in kg/kg dry
h_air,in kJ/kg dry
Air Off-Coil
T_db,out °C
RH_out %
W_out kg/kg dry
h_air,out kJ/kg dry
Flow
Face Velocity m/s
V_face drives: V_max → h_o → UA → Q_avail. Also sets ṁ_da via frontal area.
ρ_moist air kg/m³
ṁ_da kg/s
V̇_air m³/s
V̇_air m³/hr
h_o W/m²K
↑ h_o auto-updates with V_face & geometry. Clear to re-enable auto.
F. Coil Geometry
Tube OD mm
Tube ID mm
Horizontal Pitch (S_T) mm
Vertical Pitch (S_L) mm
Coil Width mm
Coil Height mm
No. of Rows
Coil Depth = No. of Rows × S_L (auto-calculated below)
No. of Circuits
Fins per inch (FPI) 1/in
Fin Spacing mm
Coil Depth mm
Tubes per Row
Total Tubes
Total Tube Length m
No. of Fins
Min Free-Flow Area
Max Air Velocity m/s
A_p (bare prime)
A_f (fin)
A_o (total outside)
A_i (internal)
H. Fin Performance
η_f (fin eff.)
η_o (surface eff.)
A_eff (effective)
G. Thermal Resistance Network
R_i (internal) K/W
R_wall K/W
R_contact K/W
R_o (external) K/W
R_total K/W
UA W/K
U_i W/m²K
U_o W/m²K
LMTD K
ΔT₁ (air in - T_ref) K
ΔT₂ (air out - T_ref) K
Q_available kW
A_required
A_available (A_eff)
Coil W × H × D
Resistance Breakdown
R_i
R_wall
R_contact
R_o
I. Warnings / Validation
Coil Adequacy
UNKNOWN