Example heat exchanger Data Heater AnnularGap Heatexchanger  classwikitable   Dimension  Inches  cm  mm  m  Inner diameter of pipe         Perimeter          Length of gap same as length of tubular heater          Gap Depth thickness Affperimeter          Hydraulic Radius          Total outer HXarea linear units                       Cooler Slot Heatexchanger  classwikitable   Dimension  Inches  cm  mm  m  Inner diameter of pipe                Minimum Required pipe diameter                Minimum Required Pipe wall thickness               Length of heat exchanger                Hydraulic Radius of slots                Width of slots min  kerf                Slot Depth or fin height                     of slots    of slot  fin pairs               Width of fins material between slots                Total wettedarea linear units