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Heat Exchanger Calculator
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Input Parameters
Unit System
Imperial (°F, BTU, ft)
SI (°C, kW, m)
Heat Transfer Rate (BTU/hr)
Hot Fluid Inlet Temp (°F)
Hot Fluid Outlet Temp (°F)
Cold Fluid Inlet Temp (°F)
Cold Fluid Outlet Temp (°F)
Calculate
Results
Heat Exchanger Analysis
70
LMTD °F
719
UA Value BTU/hr·°F
1
Effectiveness
Heat Exchanger Performance Calculation Theory
Click to expand theory section
Calculation Steps
1
Calculate LMTD
Formula:
L
M
T
D
=
Δ
T
1
−
Δ
T
2
ln
(
Δ
T
1
/
Δ
T
2
)
LMTD = \frac{\Delta T_1 - \Delta T_2}{\ln(\Delta T_1 / \Delta T_2)}
L
MT
D
=
ln
(
Δ
T
1
/Δ
T
2
)
Δ
T
1
−
Δ
T
2
Calculation:
L
M
T
D
=
80
−
60
ln
(
80
/
60
)
LMTD = \frac{80 - 60}{\ln(80 / 60)}
L
MT
D
=
ln
(
80/60
)
80
−
60
Result:
69.52
°F
69.52 \text{ °F}
69.52
°F
