Plate heat exchanger is a component used in what we commonly refer to as plate heat exchangers, which transfers the heat from heating water (system water) heated in the furnace to tap water
The plate heat exchanger in a wall-mounted boiler is quite simple. This type of brazed stainless steel plate heat exchanger is fast and efficient. A small plate heat exchanger can meet the heat exchange needs for tap water. A 24-kilowatt plate heat exchanger has 13 plates, while a 28-kilowatt one has 16 plates. I noticed that the ones in domestic wall-mounted boilers are even smaller, with only 7-8 plates for a 24-kilowatt model. However, as long as the heat exchange area and turbulence level are optimized, rapid heat exchange can be achieved. GB25034-2010 sets requirements for plate heat exchangers. Wall-mounted boilers basically use counterflow to achieve better heat exchange effects
For plate heat exchangers, cleaning is crucial, and using a cleaning pump is an effective method. Wash with 5% phosphoric acid, or if frequent cleaning is required, use 5% oxalic acid to wash in both directions. The flow rate of the washing liquid should be 1.5 times the normal flow rate
After acid cleaning, use 1-2% sodium hydroxide to clean to ensure that the acid inside the plate heat exchanger is neutralized, and then rinse with clean water. Acidic substances are corrosive and harmful to wall-mounted boilers, heating system terminals, and even the cleaning pump itself. There's not much to say about plate heat exchangers, which means cleaning is very important