Figure shows two key findings for shell and tube heat exchangers: 1) the fairly good agreement between NETL (2002) Fixed/Floating S&T and Peters (2003) floating head shell and tube costs, especially at large heat exchange areas, and 2) the poor fit of cost data by GETEM and Smith (2016) across the heat exchange areas investigated. A regression of the Peters (2003) floatinghead data is used for all shell and tube heat exchangers in genGEO (see table ).