ENTHALPY MEASUREMENT FOR TWO PHASE SUBSTANCE

摘要

A first enthalpy calculating module calculates the enthalpy of the substance in a two-phase condition with the module using a set of discrete function blocks. The specific vol. of the overall mixt. is calculated using a density transmitter. Tables are used to obtain the specific volumes of the gas and vapour parts of the substance on the basis of the measured temp. for the substance as measured by a temp. transmitter. Another module, comprising a set of function blocks, generates the enthalpy of the substance when it is superheated or entirely in the vapour phase.