Before selecting a finned tube heat exchanger, at least the inlet temperatures, flow rates, allowable pressure drops of the hot fluid and cold fluid, as well as the on-site ambient temperature and humidity, should be confirmed. Taking a drying line as an example, the required air temperature difference between inlet and outlet is ≥25°C, the ambient temperature is -20 to +60°C, and the relative humidity is <80%. If these basic data are missing or have significant deviations, subsequent calculations and structural design will lack a reliable basis.
Finned tube specifications directly affect the heat transfer area and air-side resistance. Fin spacing, fin height, tube diameter, and arrangement must match the air volume and allowable pressure drop. Increasing the number of tube rows can enhance heat transfer capacity, but air-side resistance will also increase. During selection, a balance should be struck between heat transfer and resistance based on actual operating conditions, rather than simply increasing the number of rows.
After the equipment arrives, it is necessary to check the finned tube specifications, number of tube rows, and connection orientation against the drawings for consistency, and to retain material certificates and pressure test records. If the connection orientation does not match the on-site piping route, additional pipe modification work will be required. For retrofit projects with limited space, the overall dimensions, maintenance space, and connection method should be confirmed during the selection stage.
After adjusting the temperature knob to the desired value, observe whether the indicator light displays normally. During operation, regularly check the fins for dust accumulation, frost formation, and corrosion, and arrange cleaning as needed. For low-temperature applications, attention should be paid to antifreeze measures and draining the medium during shutdown.
