Advanced Heat Transfer: Heat Exchangers
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Heat exchangers are devices that allow the exchange of heat between two fluids at different temperatures while preventing them from mixing. Heat exchangers are widely utilized in a variety of applications, ranging from home heating and cooling to chemical processing and power generation in big plants. Heat exchangers vary from mixing chambers in that the two fluids involved are not allowed to combine.
Heat transmission in a heat exchanger is typically accomplished by convection in each fluid and conduction through the wall that separates the two fluids. In heat exchanger analysis, it is convenient to use an overall heat transfer coefficient U that accounts for the contribution of all these heat transfer factors. The rate of heat transfer between two fluids at a point in a heat exchanger is determined by the size of the temperature differential at that point, which fluctuates over the length of the heat exchanger.
Heat exchangers are created in a number of sorts, therefore we begin this course with heat exchanger classification: parallel flow, counter flow, cross flow, and shell and tube heat exchangers. The determination of the total heat transfer coefficient in heat exchangers, as well as the log mean temperature difference (LMTD) for particular setups, is then discussed. The correction factor F is then included to account for the departure of the mean temperature difference from the LMTD in complicated arrangements. The effectiveness-NTU technique is next discussed, which allows us to study heat exchangers when the fluid outlet temperatures are unknown.
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