STEAM TABLES

In actual practice, it is quite cumbersome to calculate the relation between various quantities such as pressure, temperature, volume, enthalpy, latent heat and entropy, etc., of steam. Such quantities have been determined experimentally and recorded in the form of tables known as steam tables. Steam table is a complete data book that contains various properties, like volume, internal energy, enthalpy and entropy for 1 kg of water in different phases for a given pressure or temperature. Steam table is given in the Appendix A. The properties of steam are given in three different tables—saturated steam table based on temperature (Appendix A.1.1), saturated steam table based on pressure (Appendix A.1.2), and superheated steam table (Appendix A.1.3). When the temperature is selected as independent variable and the properties of steam are tabulated, the steam table is referred to as the saturated steam table based on temperature. When the pressure is chosen as independent variable, it is referred to saturated steam table based on pressure. For superheated steam, there is a separate table for different amount of degree of superheat.

Values for unknown pressure or temperature can be calculated by linear interpolation between two consecutive values. Saturated steam table based on pressure for a particular pressure (= 1 bar) is shown in Table 2.1.

Table 2.1 Saturated steam table based on pressure