When designing and calculating the plate heat exchanger, the designer should have the following information: (1) Select the main geometric parameters of the suitable plate, such as the effective heat exchange area per plate, the equivalent diameter or plate spacing, the channel cross-sectional area and the channel length. (2) Applicable medium type and applicable temperature, pressure range. Heat transfer and pressure drop correlation or plate performance data provided in the form of a line.(3) Relevant physical property data of fluid at average working temperature, including: density, specific heat capacity, thermal conductivity and viscosity.
In the design calculation, first select a plate type and plate size, then assume the number of flows of hot and cold fluids, the number of channels, then calculate the logarithmic mean temperature, Reynolds number and various physical parameters, and finally calculate Heat transfer coefficient.The actual heat exchange area is determined by the calculated heat exchange coefficient and checked, and finally the pressure drop is checked.If the pressure drop exceeds the set range, the number of channels of the hot and cold fluid, the number of processes, and the thermal calculation are re-evaluated.The optimal design of the heat exchanger requires that the designed heat exchanger meets the requirements and one or several indicators are the best.