Vapour Pressure Measurements and Correlations for 1,1-Difluoroethene (R-1132a) at 240–296 K using a Newly Developed Isochoric Apparatus

Thu, Kyaw; Perera, Uthpala A.; Miyane, Kozue; Sakoda, Naoya; Higashi, Yukihiro

doi:10.1007/s10765-023-03167-5

Cited by 1 publication

(8 citation statements)

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“…) and density (U ρ ) of the three isochoric apparatus Property App-HRT [18] App-LRT [19] App-WRT [17] Temperature 0.3 %, while the temperature measurements have an uncertainty of U T = 10 mK. The uncertainty at the critical point varies slightly from this due to the larger uncertainties associated with critical opalescence phenomena and difficulty in distinguishing the disappearance of the meniscus level.…”

Section: Tablementioning

confidence: 99%

“…Three isochoric apparatus were utilized for the experimental measurements in this work. All three devices are previously described in detail and are referred to as 'Apparatus-Higher than Room Temperature' (App-HRT) [18], 'Apparatus-Lower than Room Temperature' (App-LRT) [19] and 'Apparatus-Wide Range of Temperatures' (App-WRT) [17]. All three apparatus have an upper pressure limit of 7 MPa.…”

Section: Isochoric Apparatusmentioning

confidence: 99%

“…For the measured parameters of temperature, pressure, volume and density, the final expanded uncertainties ( U x ) for the three apparatus with a coverage factor of (k = 2) are provided in Table 1. The schematics and detailed uncertainties for App-HRT and App-LRT and App-WRT have been provided in the literature [17][18][19].…”

Section: Isochoric Apparatusmentioning

confidence: 99%

“…Individual correlations were optimized for each of these properties. These correlations were also compared to previous measurements of R-1132a properties from the literature sources of Mears et al [11], Otto and Thomas [12], Low [5], Tomassetti and di Nicola [15] and Thu et al [17]. Additionally, the P-R EoS was utilized to represent the overall thermodynamic behavior of R-1132a and to obtain its enthalpy and entropy.…”

Section: Refrigerantmentioning

confidence: 99%

“…The most recent investigations related to R-1132a are from Tomassetti and di Nicola [15], where the vapor pressures and superheated vapor-phase PvT properties were measured and by Tomassetti et al [16] where the triple-point temperature was presented. Thu et al [17] recently published the vapor pressures along a single isochore in the two-phase region as well.…”

Section: Introductionmentioning

confidence: 99%

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PvT Properties and Thermodynamic Property Correlations for the Low Global Warming Potential Hydrofluoroolefin Refrigerant R-1132a (1,1-Difluoroethene)

et al. 2023

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R-1132a is increasingly being considered as a low global warming potential component in alternative mixtures to R-23 in specialized low temperature and ultra-low temperature refrigeration systems. Though the thermodynamic properties of R-1132a were investigated in several studies up to 2018, reinvestigations have been carried out in recent years. In order to contribute toward these renewed measurements, the critical parameters of R-1132a were experimentally re-determined. Thirty-two vapor pressures from 240 K to the critical temperature, fifteen saturated vapor and six saturated liquid densities above 254 K and the PvT properties in both the vapor phase (98 points) and liquid phase (34 points) from densities of 50 kg·m −3 to 760 kg·m −3 were also measured. Specific correlations for each of these properties were optimized and compared to previously available data from the literature. Additionally, the Peng–Robinson equation of state was used to represent the aforementioned properties and further utilized to determine the enthalpy and entropy of R-1132a. Supplementary Information The online version contains supplementary material available at 10.1007/s10765-023-03184-4.

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Section: Tablementioning

confidence: 99%