The properties of water and steam have been described by the “International Association for the Properties of Water and Steam”. The latest release is the IAPWS97 document, which is available at this site under publications. This document includes formulas for the various properties which make it fairly simple to develop software for use in HRSG design and rating.
The formulation suggested for industrial use is the IAPWS-IF97 which replaces the 1967 document, IFC67. It should be noted that there is no significant differences in these two sets of formulations, in the pressure and temperature ranges normally used in HRSGs.
The following JavaScript calculator is based on the IFC67 formulations. This calculator has not been tested throughout the overall range of pressure and temperatures covered by these formulations, but should be sufficient for the purposes of this introduction to HRSG design.
Disclaimer:
The formulas and correlations presented herein are all in the public domain and are to be used only as a learning tool. Note that any product, process, or technology in this document may be the subject of other intellectual property rights reserved by sponsors or contributors to this site. This publication is provided as is, without any warranty of any kind, either expressed or implied, including, but not limited to, the implied warranties of fitness for a particular purpose, or non-infringement.
The formulas, correlations, and methods presented herein should not be considered as being recommended by or used by the sponsors of this site. The purpose of this site is educational and the methods may or may not be suitable for actual design of equipment. Only a fired heater design engineer is qualified to decide if a calculation or procedure is correct for an application.