The working principle of the plate heat exchanger is carried out through the heat transfer mechanism. According to the law of thermodynamics, heat is always spontaneously transferred from high-temperature objects to low-temperature objects. Two fluids with different temperatures flow in the space separated by the wall, through the wall heat conduction and the fluid forms convection on the wall surface. Under the same flow resistance and pump power consumption, its heat transfer coefficient is about three times higher than that of the shell-and-tube heat exchanger. It is the key, high-efficiency and new equipment for rational utilization of effective resources, conservation and development of new energy. Can the hot and cold interfaces of the plate heat exchanger be interchangeable?
(1) The plate heat exchanger has a good effect in unilateral flow countercurrent heat exchange. When the primary side (heat source side) and the secondary side (heated side) are on the same side, and the water inlet and outlet directions are opposite, the heat exchange effect is good. If the exchange direction is on the same side, and the reverse flow is maintained, only the inlet and outlet directions are exchanged, and the heat exchange effect is not much different.
(2) If the hot and cold water is concatenated, the heat exchanger cannot operate normally. We do not recommend swapping the hot and cold interfaces of the plate heat exchanger. If the cold and hot interfaces perform different functions, the heat exchange effect will be affected if the two are interchanged. From the point of view of heat exchange effect, we do not recommend swapping the hot and cold ports.