Gasketed Plate Heat Exchanger Design (PHex) is a software tool that is made to demonstrate the thermal analysis and calculations of Gasketed Plate Heat Exchangers. The calculations are performed through a series of click buttons arranged in order. Please note that the software can only do the basic design calculations the mechanical design! The software is easy to use and have the ability to calculate unknown temperatures. The plate dimensions and materials can be entered, this includes the size of plate heat exchanger and chevron angle.