1. Improve the logarithmic average temperature difference: The flow patterns of spiral plate heat exchangers include counterflow, downstream and mixed flow (both counterflow and downstream). Under the same circumstances, the logarithmic average temperature difference is large when flowing countercurrently and small when flowing downstream, and the mixed flow pattern is somewhere between the two. The method to increase the logarithmic average temperature difference of the spiral plate heat exchanger is to use a countercurrent or close to countercurrent mixed flow pattern as much as possible to increase the temperature of the hot side fluid and reduce the temperature of the cold side fluid as much as possible.
       2. Determination of the position of the inlet and outlet pipes: For single-flow plate heat exchangers, for the convenience of maintenance, the fluid inlet and outlet pipes should be arranged on the side of the fixed end plate of the spiral plate heat exchanger as much as possible. The greater the temperature difference of the medium, the stronger the natural convection of the fluid, and the more obvious the influence of the stagnation zone formed. Therefore, the inlet and outlet positions of the medium should be arranged so that hot fluid enters and exits at the top, and cold fluid enters and exits at the bottom, in order to reduce the influence of the stagnant zone and improve heat transfer efficiency.
       3. Improve heat transfer efficiency: The plate heat exchanger is a partition heat exchanger. Hot and cold fluids transfer heat through the spiral plate heat exchanger plates. The fluid and the plates are in direct contact. The heat transfer methods are heat conduction and convection heat transfer. The key to improving the heat transfer efficiency of plate heat exchangers is to increase the heat transfer coefficient and logarithmic average temperature difference.
       4. To improve the heat transfer coefficient of the heat exchanger, the heat transfer coefficient of the spiral plate heat exchanger can be effectively improved only by simultaneously increasing the surface heat transfer coefficient on both hot and cold sides of the plate, reducing the thermal resistance of the dirt layer, selecting plates with high thermal conductivity, and reducing the thickness of the plates.