Thermal calculation method of plate heat exchanger_
The thermal calculation method of 1305 brand plate heat exchanger: The thermal calculation of plate heat exchanger also has two types: planning and checking. In planning and accounting, the flow rate of the fluids on both sides and the arbitrary three of the four inlet and outlet temperatures have been given, and the brand plate heat exchanger needs to be calculated to calculate the useful heat transfer area and flow process and channel arrangement and combination method under certain pressure constraints. . Checking and accounting are contrary to planning accounting. The heat exchange area and flow channel placement are known, and the flow rates of cold and hot fluids and inlet and outlet temperatures are also known values. The demand calculation is based on the channel placement plan, and the fluid outlet temperature Whether the reservation policy can be reached and whether the pressure drop is satisfied with the demand value. The working temperature is below 250℃, and the working temperature of the plate heat exchanger is determined by the temperature that the gasket can accept. When using rubber elastic gaskets, the high working temperature is below 200℃; when using compressed asbestos wool gaskets, the high working temperature is 250~260℃. The working pressure is below 2.5MPa, the plate heat exchanger is sealed by gaskets, the periphery of the seal is very long, and the support condition of the two seals of the corner holes is poor, and the gasket cannot obtain the satisfactory pressing force, so its The high working pressure of the plate heat exchanger is only 2.5MPa; when the area of u200bu200bthe single plate is more than 1m2, the working pressure is often lower than 2.5MPa. The plate heat exchanger is not suitable for the medium that easily blocks the passage. The passage between the plates of the plate heat exchanger is very narrow, usually 3~5mm. When the heat exchange medium contains larger solid particles or fibrous substances, it is easy to block the passage between the plates. For this kind of heat exchange occasions, we should consider importing equipment filtering equipment, or choose a regenerative cooling system. The optimization design of the brand plate heat exchanger can be calculated by the application of a computer. The optimization is actually the development, systematic and regularization of the calculation of the plan, and the optimized design can achieve economic and social benefits. The purpose of the optimized design of the bellows heat exchanger is to make the structural parameters of the bellows heat exchanger reach good values, and to achieve a good combination of structural parameters, in order to achieve a large heat transfer. The CAD technology of the bellows heat exchanger, the CAD of the heat exchanger is the English abbreviation of Computer Aided Design. The CAD of the heat exchanger is to use the computer to complete a set of design files of the heat exchanger and draw the heat exchanger construction drawings. The steps are as follows: the user proposes the process condition data and various restriction conditions. The performance calculation process is iterated to find a satisfactory result, and the final result is compiled into a data table. Draw the construction drawing of the heat exchanger. Perform heat transfer and fluid mechanics performance calculations, find the total heat transfer coefficient and the required small heat transfer area, and print out the intermediate results. Perform structural design calculations according to the performance calculation results, print out the calculation results, and compile a data table.