Experimental study on the gaseous pρTx properties for (HFO1234yf + HC290)
Introduction
In the background of ozone depletion and global warming, looking for alternative refrigerants that are efficient and environmentally friendly is considered as an important research direction. According to the Montreal Protocol and Kyoto Protocol, refrigerants such as chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and hydrofluorocarbons (HFCs) will be prohibited due to their significant impact on ozone depletion potential (ODP) or high global warming potential (GWP). Thus the refrigerants with zero ODP and zero or low GWP such as hydrocarbons (HCs) and hydrofluoroolefins (HFOs) have aroused considerable attention.
HFO1234yf has zero ODP, a remarkably low 100 year GWP of 4 relative to CO2 [1], with an atmospheric lifetime approximately 11 days, and it features thermophysical properties similar to HFC134a [2]. For these reasons, HFO1234yf has been proposed as one potential alternative to HFC134a in automotive air conditioning and other applications [3], [4], and the mixtures containing HFO1234yf are promising alternative refrigerants. Many literature studies [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23] on the thermal properties of HFO1234yf-mixtures have been published as summarized in Table 1.
Knowledge of reliable thermophysical properties of refrigerants is essential both for fundamental EOS establishment and for engineering calculations. The vapour-liquid equilibrium (VLE) values for HFO1234yf + HC290 binary mixtures are not available in the published literature, and there are few reports for the gaseous pρTx results. Brown et al. [20] determined gaseous density by the constant-volume method at temperatures from (268 to 363) K and mole fractions of HC290 at (0.230,0.505,0.611 and 0.709) of which 19 data points are below 300 K. In this work, we present gaseous pρT values for pure HFO1234yf. Moreover, gaseous pρTx measurements for (HFO1234yf + HC290) binary mixtures are also presented. These measurements were obtained for temperatures ranging from (265.460 to 300.268) K and at pressure up to 0.70252 MPa.
Section snippets
Materials
The experimental sample of HFO1234yf was supplied by Honeywell with a claimed mole fraction purity of higher than 0.999.The HC290 sample was supplied by Beijing AP BAIF Gases Industry Co. Ltd. with a declared mole fraction purity of higher than 0.999. The mole fraction purity of all chemicals was checked to be no less than 0.999 by a gas chromatography method. All the samples were used without further purification. Table 2 lists the detailed information on the two samples.
Measurements
The compact
Results
In this work, 32 data points for pure HFO1234yf and 136 pρTx measurements for (HFO1234yf + HC290) binary mixtures were carried out at temperatures from (265.460 to 300.268) K and pressures from (0.10099 to 0.70252) MPa in the gas phase. The detailed experimental results are listed in Table 3, Table 4.
Conclusions
New pρT values for pure HFO1234yf and 136 gaseous pρTx for binary mixtures of (HFO1234yf + HC290) are presented within the temperatures from (263 to 300) K, pressures from (0.10 to 0.70) MPa, and mole fractions of HFO1234yf from (0.0906 to 1.0000). Good agreement was found between the experimental pρTx values and those calculated from the virial and PT EOS with average absolute relative deviations of 0.085% and 0.132% for density, respectively. It is expected that the measured values will be
Acknowledgement
The supports provided by the National Natural Science Foundation of China (Grant No. 51406219 and 51625603) for the completion of the present work are gratefully acknowledged.
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