The thermal efficiency and heat transfer rate of a plate heat exchanger (PHE) are primarily influenced by the efficiency of the plates and the heat transfer occurring between them. A higher level of heat transfer between the plates leads to a greater efficiency of the PHE. In this particular study, an analysis of the plates of a plate heat exchanger is conducted using the ANSYS software. The objective is to enhance the heat transfer rate and overall efficiency of the PHE by increasing the length of the side surface of the plate. This elongated surface, located at the boundary of the plate, reduces the plate’s temperature and subsequently increases the heat transfer rate and thermal efficiency. Various research studies have been conducted on plate heat exchangers to improve their thermal efficiency and heat transfer rate, including modifications in design, changes in plate geometry, and alterations in plate shape.