PVT measurements of water-ammonia refrigerant mixture in the critical and supercritical regions |
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| Authors: | NG Polikhronidi IM Abdulagatov RG Batyrova GV Stepanov |
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| Affiliation: | aInstitute of Physics of the Dagestan Scientific Center of the Russian Academy of Sciences, 367005 Makhachkala, M. Yaragskogo Str. 94, Dagestan, Russia;bGeothermal Research Institute of the Dagestan Scientific Center of the Russian Academy of Sciences, Makhachkala, 367030 Makhachkala, Shamilya Str. 39, Dagestan, Russia |
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| Abstract: | The PVTx properties of H2O + NH3 mixture (0.2607 mole fraction of ammonia) have been measured in the near- and supercritical regions. Measurements were made along 40 liquid and vapor isochores in the range from 120.03 to 727.75 kg m−3 and at temperatures from 301 to 634 K and at pressures up to 28 MPa. Temperatures and densities at the liquid–gas phase transition curve, dew- and bubble-pressure points, and the critical parameters for the 0.7393 H2O + 0.2607 NH3 mixture were obtained using the quasi-static thermograms and isochoric (P–T) break-point techniques. The expanded uncertainty of the density, pressure, temperature measurements at the 95% confidence level with a coverage factor of k = 2 is estimated to be 0.06%, 0.02–0.09%, and 15 mK, respectively. |
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| Keywords: | Refrigerant Aqueous solution Ammonia/water Experiment Measurement Pressure Density Temperature Critical pointMots clé s: Frigorigè ne Solution aqueuse Ammoniac/eau Expé rimentation Mesure Pression Masse volumique Tempé rature Point critique |
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