PHex is an easy to use tool which domonstrates the thermal calculations of Gasketed Plate Heat Exchangers, The plate dimensions and materials can be entered, this includes the size of plate heat exchanger and chevron angle (25 to 65 degrees). List of main features: 1_ User friendly and easy to use with ability to save/load data. 2_ Estimate the Physical properties of more than 1450 components; the database has the ability to estimate Thermal Conductivity, Density, Heat Capacity and Viscosity. The database also included critical properties, boiling and melting points. 3_ Estimate mixture properties. 4_ Create you own database of Plates and Components. You can add your fluid physical properties and load the data to your project with a click of a button and more... 5_ Chose between S.I. or English U.S. units of measurements. 6_ Temperature and Flow rate estimation in the event of insufficient data. 7_ Heat load required (clean or fouled) calculations. 8_ Duty clean / dirty calculations 9_ Total effective area calculation. 10_ Surface area calculation. 11_ Number of plates calculations. 12_ Overall Coefficient (clean / dirty) calculations. 13_ Pressure drop Channel/Port/Total for Hot side and Cold side Calculations. 14_ Plate heat exchanger dimension calculations. 15_ Velocity through ports, Mass velocity through channel/ports calculations. 16_ Reynolds and Nusselt numbers calculations. 17_ Heat transfer coefficient calculations 18_ Summary of results with image to help in understanding.