Analysis and characterization of an optical fiber for Carrol–Water liquid pair

A system of energy recovery depends on the process operation conditions from which it receives the energy when a Carrol–Water pair is used. To improve the performance of the energy recovery system, the variables of temperature, pressure and concentration must be in balance. External sensors for temperature and pressure may be installed for all components. However, concentration is not determined online, and therefore an indirect method must be considered, such as optical transmittance correlation. Humidity contamination accounts for the hygroscopicity of Carrol water samples.The analysis of Carrol–Water optical characteristics is presented at multiple concentrations and temperatures, in which a transfer function involving absorbance and temperature is determined in order to define liquid pair concentration, as a function of actual temperature and signal intensity. This calculation provided the guideline to generate a control system that helps regulate thermal regimens. The characterization of this pair was made from temperature values ranging from 25 °C to 80 °C and mass concentration ranging from 51.79% to 66.2%.

► This paper shows a non invasive way for the Carrol–water concentration measurement.
► The use of an optical technique using arbitrary units for a generalized transmittance method is proposed.
► The in-line determination for concentration into an AHT (absorption heat transformer) allows to the operators lead to higher efficiencies.
► Main advantage of the tested method is the simplification of the measured equipment required.