GPSA Ch. 14
| Parameter | Range |
|---|---|
| Gas Inlet Temp | 80–120°F |
| Gas Outlet Temp | −20–40°F |
| Approach Temp | 5–15°F |
| U-value (S&T) | 50–150 BTU/hr-ft²-°F |
| Fouling Factor | 0.001–0.003 hr-ft²-°F/BTU |
Heat Duty:
Where Q = heat duty (BTU/hr), m = gas mass flow rate (lb/hr), Cp = gas specific heat (BTU/lb-°F), Tin = gas inlet temperature, Tout = gas outlet temperature.
Heat Transfer Area:
Where A = required heat transfer area (ft²), U = overall heat transfer coefficient (BTU/hr-ft²-°F), LMTD = log-mean temperature difference (°F), Ft = LMTD correction factor for multi-pass exchangers.
Log-Mean Temperature Difference:
For shell-side boiling refrigerant at constant temperature: ΔT1 = Tgas,in − Trefrig and ΔT2 = Tgas,out − Trefrig.
Refrigerant Flow: Determined from heat duty divided by the latent heat of vaporization of the selected refrigerant at operating pressure. Propane is the most common refrigerant in midstream gas processing.
Understand gas chiller design, refrigerant selection, and LMTD calculations for refrigeration service