Shell and tube heat exchanger
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1. When designing an EDR for a shell-and-tube heat exchanger, how can I ensure that the heat amounts of the cold and hot fluids flowing through it are balanced? Why do I keep getting warnings about an imbalance between these fluids?
There could be two reasons for this situation: 1) You have defined a heat load, which results in the calculated cold and hot stream values deviating from the specified heat load, hence the alarm is triggered； 2) The heat load is not defined, resulting in insufficient degrees of freedom for the process parameters of the hot and cold streams. To determine the process parameters for the heat exchange load, aside from the physical properties of the hot and cold media (such as heat capacity), the remaining parameters are the mass flow rates of the hot and cold streams as well as their inlet and outlet temperatures. Generally, once the flow rate on one side and the inlet and outlet temperatures are determined, one parameter can be left flexible on the other side; for example, the inlet and outlet temperatures on that side can be specified, while the flow rate is not specified, or only the temperature of either the inlet or the outlet is given. Only in this way can the calculations remain balanced