TY - JOUR
T1 - Gaseous densities of 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) and isobutane (R600a) binary system
T2 - Measurements and a preliminary Helmholtz equation of state
AU - Zhang, Haiyang
AU - Li, Huiya
AU - Gao, Bo
AU - Zhong, Quan
AU - Wu, Wei
AU - Liu, Wenjing
AU - Dong, Xueqiang
AU - Gong, Maoqiong
AU - Luo, Ercang
PY - 2018/11
Y1 - 2018/11
N2 - In this work, 101 gaseous densities of 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) + isobutane (R600a) were carried out by using a compact single-sinker densimeter based on the well-known Archimedes’ buoyancy principle. The experiment ranges in temperature, pressure, mole fraction of R1234yf and density are (270.105 to 300.214) K, (0.1014 to 0.4539) MPa, (0.2677 to 0.8630) and (3.207 to 20.523) kg m−3, with overall standard uncertainties of 5 mK, 200 Pa, 0.0005 and 0.10%, respectively. In addition, the multi-fluid approximations model combined with 11 mixing rules were employed to develop a preliminary Helmholtz free energy equation of state for R1234yf + R600a using the present and available experimental data. Good agreement between the experimental values and that calculated from the Helmholtz equation were found. Azeotropic characteristics was investigated at temperatures from (253.15 to 353.15) K, and correlation functions were developed for azeotropic component, pressure, saturated liquid and vapor densities.
AB - In this work, 101 gaseous densities of 2,3,3,3-tetrafluoroprop-1-ene (R1234yf) + isobutane (R600a) were carried out by using a compact single-sinker densimeter based on the well-known Archimedes’ buoyancy principle. The experiment ranges in temperature, pressure, mole fraction of R1234yf and density are (270.105 to 300.214) K, (0.1014 to 0.4539) MPa, (0.2677 to 0.8630) and (3.207 to 20.523) kg m−3, with overall standard uncertainties of 5 mK, 200 Pa, 0.0005 and 0.10%, respectively. In addition, the multi-fluid approximations model combined with 11 mixing rules were employed to develop a preliminary Helmholtz free energy equation of state for R1234yf + R600a using the present and available experimental data. Good agreement between the experimental values and that calculated from the Helmholtz equation were found. Azeotropic characteristics was investigated at temperatures from (253.15 to 353.15) K, and correlation functions were developed for azeotropic component, pressure, saturated liquid and vapor densities.
KW - Density
KW - Equation of state
KW - R1234yf
KW - R600a
KW - Single-sinker densimeter
UR - http://www.scopus.com/inward/record.url?scp=85054175888&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85054175888&origin=recordpage
U2 - 10.1016/j.ijrefrig.2018.07.029
DO - 10.1016/j.ijrefrig.2018.07.029
M3 - RGC 21 - Publication in refereed journal
SN - 0140-7007
VL - 95
SP - 28
EP - 37
JO - International Journal of Refrigeration
JF - International Journal of Refrigeration
ER -