The document discusses heat exchanger design equations and concepts. It covers the basic design equation relating total heat load, overall heat transfer coefficient, area, and logarithmic mean temperature difference. It also discusses calculating the overall heat transfer coefficient based on individual film coefficients, fouling resistances, and wall properties. Fin efficiency equations are presented relating efficiency to geometry. Charts are shown to determine the configuration factor relating mean and logarithmic temperature differences for common exchanger arrangements. Terminal temperatures are used to calculate parameters to look up the configuration factor from charts.