1. The key parameters for selecting a plate heat exchanger include the heat exchanger material, operating pressure, and design temperature.
2. When selecting a heat exchanger, the side with the lower heat transfer coefficient should ideally receive the highest flow velocity, and the heat transfer coefficients on both sides of the two fluid exchange surfaces should be equal or similar to improve the overall heat transfer coefficient. The temperature of the fluid heated by the heat exchanger should be 10°C lower than the saturation temperature at the heat exchanger outlet pressure, and should also be lower than the operating temperature of the secondary water pump.
3. Fluids containing sediment or impurities should be filtered before entering 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 high, and should be sufficient to meet the pressure drop requirements.
5. For situations with large flow rates and low allowable pressure drops, a plate type with low resistance should be selected; conversely, a plate type with high resistance should be selected.
6. Select a detachable or welded type based on the fluid pressure and temperature conditions.
7. Plates with too small an area should not be selected, as an excessive number of plates will result in low flow velocity between the plates, reducing the heat transfer coefficient.
8. Steam should not be used as the heat exchange medium in plate heat exchangers.
