Quasi-steady state moving boundary reduced order model of two-phase flow for ORC refrigerant in solar-thermal heat exchanger

Figure shows the schematic diagram of the tube placed in the thermic oil reservoir inside the heat-exchanger, that carries R134a as the working fluid (From left to right, the colored zones represent (i) sub-cooled region, (ii) two-phase flow region and (iii) superheated region, respectively). A simplified quasi-steady state reduced order model is utilized to investigate moving boundary characteristics in a narrow tube of heat exchanger that carries organic refrigerant as working fluid in the medium solar thermal applications (∼200 °C).71