How Can The Average Temperature Difference Method For Analyzing Plate Heat Exchangers Be Calculated

1. Calculate the unknown temperature or flow, calculate the unknown temperature or flow through the Thermal equilibrium equation, and also calculate the heat load Q.

2. Choose a suitable plate model based on heat exchange and flow rate. The selection of plate model should be determined based on specific working conditions. When the flow rate is high and the pressure drop is low, a plate type with low resistance should be selected; On the contrary, the plate with a slightly larger Drag coefficient can be selected.

3. Estimate the heat exchange area and calculate the approximate heat exchange area based on the heat exchange rate.

4. Select the process and number of channels, preliminarily select the cold and hot fluid process and number of channels, and calculate the flow rate accordingly.

5. Find the average temperature difference of the plate heat exchanger.

6. To calculate the convection Heat transfer coefficient and the total Heat transfer coefficient, first calculate the convection Heat transfer coefficient of cold and hot fluids respectively, and then calculate the total Heat transfer coefficient.

7. Calculate the required heat exchange area.

8. Go back and calculate the heat exchange area.

9. The allowable pressure drop is often a limiting factor in the design of plate heat exchangers when verifying the pressure drop. However, design always requires sufficient allowable pressure drop. If no matter how the process layout is changed, the relationship between heat transfer load, flow rate, and allowable pressure drop cannot be coordinated, only inefficient design schemes can be made. If a satisfactory design solution is not obtained throughout the design process, it is possible to consider changing the board type.