About Heat Exchanger and Heat Transfer

Heat exchangers are tools that facilitate the exchange of heat between two fluids that are at different temperatures while keeping them from interfering with one another. Heat transfer in a heat exchangers usually involves convection in each fluid and conduction through the wall separating the two liquids. The rate of heat transfer between the two liquids at a location in a heat exchanger depends on the magnitude of the temperature difference at that location, which varies along the heat exchanger. In the analysis of heat exchangers, it is usually convenient to work with the logarithmic mean temperature difference LMTD, which is an equivalent mean temperature difference between the two fluids for the entire heat exchanger.