Seeking help with heat exchange issues in a heat exchanger! ! ! !
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I currently have a floating-head heat exchanger. The temperature of the fluid in the tube side is 265°C; after heat exchange, it drops to 220°C. The flow rate is 40 t/h. The temperature of the fluid on the shell side at the inlet is 40°C, with a flow rate of 23 t/h. What temperature can the shell side outlet temperature of the heat exchanger reach? ? ? How to calculate it? The heat exchange area of the heat exchanger is 114.8㎡
It is necessary to know the specific heat of the media on the cold side and the hot side; once the flow rate and temperature difference on the hot side are known, the heat transfer amount can be determined, and it is then easy to calculate the corresponding value for the cold side as well.
The answer above is correct; to elaborate further: First, it is necessary to know the specific heat capacity of the material being handled. Using the formula: Heat transfer amount = specific heat capacity × flow rate × temperature difference between inlet and outlet, the total heat transfer amount can be calculated. 2. Then, using the formula: Total heat transfer amount = Heat transfer coefficient (K) × Heat transfer area × Logarithmic mean temperature difference, the value of the logarithmic mean temperature difference is determined; subsequently, the outlet temperature on the shell side is calculated based on this value
At the very least, tell others what substance it is
It is necessary to know the properties of hot and cold fluids. In fact, you already know the inlet and outlet temperatures and flow rates of the hot fluid, as well as those of the cold fluid; now what’s needed is to know the specific heats of the hot and cold fluids. If there is a phase change, it is also necessary to know things like latent heat. The outlet temperature of the cold fluid can be obtained through heat balance. As for the heat exchange area, it is necessary to know more about the material properties and calculate the heat transfer coefficient in order to determine whether the requirements for heat exchange can be met.
Based on your question, the fluid in the tube side is actually a heat transfer medium; the temperature drop before and after heat exchange is 45°C, and the flow rate is 40 t/h. By multiplying these values by the specific heat capacity, the amount of heat released by the heat transfer medium can be determined. Multiplying this heat value by the efficiency of the heat exchanger gives the amount of heat energy released when heating the fluid on the shell side. Knowing the specific heat capacity of the fluid to be heated allows one to calculate the temperature it can reach.