IIR document

Study on the isochoric specific heat capacity of a R32 + R1234ze(E) mixture in the liquid phase.

Number: pap. ID: 303



Isochoric specific heat capacity (cv) of mass fraction w= 0.51 R32+(1-w)trans-1,3,3,3-tetrafluoropropene [R1234ze(E)] mixture in the liquid phase were measured with a twin-cell type adiabatic calorimeter. The sample purity of R32 and R1234ze(E) was certified to have a minimum purity of 0.9997 mole fraction and 0.9996 mole fraction respectively by gas chromatographic analysis. The measurements were obtained for temperatures ranging from 274 to 464 K and at pressures up to 30 MPa. Temperatures were measured with a platinum resistance thermometer on the bottom of each cell and were reported based on the ITS-90. Sample pressures were measured with a quartz crystal transducer. Densities were calculated from the volume of the calorimeter cell and the sample mass. The expanded uncertainty (with a coverage factor k=2) of temperature measurements is 13 mK, and 8 kPa for pressure measurements. The expanded relative uncertainty of density is 0.16%. As a result, the experimental expanded relative uncertainty of isochoric specific heat capacity (cv) is estimated to be from 2.02 to 2.75% in the liquid phase. The results of cv measurements were compared with cv measurements of the component substances of the mixture which were measured with same calorimeter previously.

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  • Original title: Study on the isochoric specific heat capacity of a R32 + R1234ze(E) mixture in the liquid phase.
  • Record ID : 30002441
  • Languages: English
  • Source: Proceedings of the 23rd IIR International Congress of Refrigeration: Prague, Czech Republic, August 21-26, 2011. Overarching theme: Refrigeration for Sustainable Development.
  • Publication date: 2011/08/21


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