During on-site operation and maintenance, after dust accumulation or scaling occurs between the fins of a tube-fin heat exchanger, air resistance increases, heat exchange efficiency decreases, and energy consumption rises accordingly. Compared with plate heat exchangers, the tube-fin structure is easier to clean dry, but the fins are relatively thin, so force must be controlled during work.
After shutdown, first cut off the power supply and wait until the surface temperature drops to ambient temperature before operating. Use a soft-bristle brush to clean along the direction of the fins, or use compressed air to blow in reverse from the air outlet side; the pressure should not be too high. Bent fins can be restored with a special fin comb tool, avoiding frequent bending that may cause cracking. If the connection between the tube bundle and the frame is loose, it should be tightened in time.
Record the inlet and outlet temperature difference and changes in air volume. A reduced temperature difference or decreased air volume often indicates dust accumulation or scaling. After adjusting the temperature knob to the required value, observe whether the signal light displays normally. If local overheating or abnormal noise is found, stop the machine and troubleshoot fin blockage or fan failure. Compared with spray-type heat exchange solutions, tube-fin types have relatively looser requirements for water quality, but the corrosiveness of the medium still needs attention.
When out of service for a long time, drain the medium inside the tubes and seal the interfaces after drying. Regularly check whether the fins have corrosion perforation, and apply a temperature-resistant coating if necessary. Wear gloves and goggles during maintenance to avoid cuts from the fins. The above parameters are compiled and released by Yangzhou Darui Electric Co., Ltd.
