Enthalpy measurement for two phase substance

Details Enthalpy measurement for two phase substance Enthalpy measurement for two phase substance

1984-03-23

1986-03-11

Schor, Kenneth M.

Measuring and testing

Turbine engine

Compressor

374 35, 374 31, 73115, 364557, 364558, 364499, G01K 1700, G01N 700, G01N 900

Patent

active

045746265

ABSTRACT:
An enthalpy measuring arrangement for measuring the heat content of a substance which may in the liquid phase, vapor phase or a mixed phase of liquid and vapor, comprises a first enthalpy calculating module for calculating the enthalpy of the substance when in a two-phase condition utilizing a plurality of discrete function blocks. The specific volumes of the overall mixture is calculated using a density transmitter which measures the density of the substance. Tables are utilized to obtain the specific volumes of the gas and vapor part of the substance on the basis of a measured temperature for the substance. These values are in turn used to obtain a quality value which is multiplied by a value representing the difference between the enthalpys of the vapor and liquid components of the substance to obtain the overall enthalpy of the mixture. Another module with a plurality of function blocks generates the enthalpy of the substance when it is superheated or entirely in the vapor phase. A selector module is connected to the mixed and vapor phase calculating modules to determine which of the modules should be utilized and to calculate the overall enthalpy of the substance regardless of its phase.

REFERENCES:
patent: 3866026 (1975-02-01), Vivy
patent: 3970832 (1976-07-01), Itschner
patent: 4078431 (1978-03-01), Mott

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