Gaseous pρTx properties for binary mixtures of HFO1234ze(E) + HC290
Introduction
On the basis of the Montreal Protocol, traditional chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs) have already been or will be replaced by hydrofluorocarbons (HFCs), with zero ozone depletion potential (ODP). However, according to the Kyoto Protocol, many HFCs can't be used as long-term alternative refrigerants because of their relatively large values of global warming potential (GWP). Consequently, refrigerants with zero ODP and low GWP values such as hydrocarbons (HCs) and hydrofluoroolefins (HFOs) have attracted considerable attention.
HFO1234ze(E) has zero ODP, a GWP value of 6 relative to CO2 on a 100-year time horizon [1], low toxicity and mild flammability [2], with an atmospheric lifetime approximately 2 weeks [1], and it exhibits similar thermodynamic behavior to HFC134a [3]. For these reasons, HFO1234ze(E) has been proposed as a potential alternative refrigerant for HFC134a in automobile air conditioners [4]. Many literatures on the thermophysical properties of HFO1234ze(E) [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15] and its mixtures [16], [17], [18], [19] have been published. HC290 is a natural refrigerant with zero ODP, a GWP value of about 20, well oils compatibility and non-toxicity [20]. Its inflammability could be reduced by mixing with HFO1234ze(E) [21]. The mixtures of HFO1234ze(E) + HC290 show azeotropic behaviors and are considered as promising alternative refrigerant. Reliable vapor–liquid equilibrium (VLE) and pρTx data of binary mixtures are essential for evaluating its performance in the refrigeration cycle. The VLE properties of HFO1234ze(E) + HC290 have been measured by Dong et al. in our previous work [22]. However, the pρTx experimental data of the binary mixtures are still absent.
In this work, new gaseous pρT data for pure HC290 and HFO1234ze(E) are presented, respectively. Furthermore, gaseous pρTx measurements for HFO1234ze(E) + HC290 binary mixtures were also obtained. These measurements were performed by a compact single-sinker densimeter with temperatures from (258.146 to 293.353) K, pressures from (0.0989 to 0.8255) MPa, and mole fractions of HFO1234ze(E) from (0.1680 to 0.8949). The experimental pρT and pρTx data were correlated with a truncated virial equation of state (EOS), and predicted by the truncated virial EOS with the second and the third virial coefficients based on different empirical correlating methods.
Section snippets
Chemicals
The HFO1234ze(E) and HC290 samples used in this work were supplied by Honeywell and Beijing AP BAIF Gases Industry Co. Ltd, respectively. Information of the two samples is shown in Table 1. The suppliers claimed a mass fraction purity of higher than 99.5% for HFO1234ze(E), and a mole fraction purity of higher than 99.9% for HC290. The two samples were used without further purification.
Apparatus
Fig. 1 presents the schematic drawing of the whole apparatus. It mainly consists of the following parts:
Results and discussion
New pρT data for pure HC290 and HFO1234ze(E) are presented in Table 2, Table 3, respectively. A total of 137 gaseous pρTx measurements were carried out at temperatures ranging from (258.146 to 293.353) K with pressures from (0.0989 to 0.8255) MPa and mole fractions of HFO1234ze(E) from (0.1680 to 0.8949). The experimental results of binary mixtures are listed in Table 4.
To represent the gaseous experimental pρTx data of the binary mixtures HFO1234ze(E) + HC290, the truncated virial EOS only
Conclusions
In this work, new pρT data for pure HC290 and HFO1234ze(E) and 137 gaseous pρTx data for binary mixtures of HFO1234ze(E) + HC290 were measured by a compact single-sinker densimeter. The measurements covered temperatures from (258.146 to 293.353) K, pressures up to 0.8255 MPa, and mole fractions of HFO1234ze(E) from (0.1680 to 0.8949). The standard uncertainty in temperature, pressure, mole fraction and density were estimated to be within 5 mK, 200 Pa, 0.0003 and 0.06%, respectively. The
Acknowledgment
This work is financially supported by the National Natural Science Foundation of China (Grant No.51406219).
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