1. The control parameters of plate heat exchanger are heat exchanger material, working pressure and design temperature.
2. When selecting a heat exchanger, try to get a large flow velocity on the side with a small heat transfer coefficient, and try to make the heat transfer coefficients on both sides of the two fluid heat exchange surfaces equal or similar, and increase the heat transfer coefficient. The temperature of the fluid heated by the heat exchanger should be 10 ° C lower than the saturation temperature at the outlet pressure of the heat exchanger, and should be lower than the working temperature of the water pump used for the secondary water.
3. The fluid containing mud and dirt should be filtered and enter the heat exchanger.
4. When selecting a plate heat exchanger, the flow velocity at the interface of the fluid with the smaller temperature difference should not be too large, and it should be able to meet the requirements of pressure drop.
5. For the case of large flow rate and small allowable pressure drop, a plate with a small resistance should be selected; otherwise, a plate with a large resistance should be selected.
6. Choose detachable or electric welding type according to fluid pressure and temperature.
7. It is not appropriate to choose a plate with a too small area, so as to avoid too many plates, the flow velocity 8. The heat exchange medium of the plate heat exchanger should not be steam.