The liquid density of CFC and HCFC alternatives is an important property which is necessary in designing the heat exchange system of a refrigerating equipment.Seven fluorinated ethers and four fluorinated ketones which are expected as promising candidates of CFC and HCFC alternatives were measured at temperatures from 278K to 323K and at atmospheric pressure within an uncertainty of 0.2%, using the vibrating tube densitometer (ANTON PARR, DMA602) which has excellent performance of measurement speed, accuracy, and small sample quantity for a various type of a spescimen.The samples used in this study are 1, 1, 2-trifluoro-1-(2, 2, 2-trifluoroethoxy) ethane, 1;1, 2, 2-tetrafluoro-1-(2, 2-difluoroethoxy) ethane;1, 1, 2, 3, 3, 3-heptafluoro-1-methoxypropane;2, 2, 3, 4, 4, 4-hexafluoro-1-(monofluoromethoxy) butane;2, 2, 3, 3, 3-pentafluoro-1-(1, 1, 2, 2- tetrafluoroethoxy) propane; 1, 1, 2, 2, 3, 3, 3-heptafluoro-1-(1, 2, 2 -trifluoroethoxy) propane1;1, 1, 2, 2, 3, 3, 4, 4, 4-nonafluoro-1-ethoxybutane ; 3, 4, 4, 4-tetrafluoro-3-trifluoromethylbutane-2-ketone; 3, 3, 4, 4, 5, 5, 5-heptafluoropentane-2-ketone; 3, 3, 4, 4, 5, 5, 6, 6, 6-nonafluorohexane-2-ketone; 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 7-undecafluoroheptane-2-ketone.The liquid densities decrease monotonically with increase of temperature. The measurement value can be predicted within ±0.3% deviation using the HBT method or the Rackette equation if one point measurement was performed in case of the unknown critical values of the sample. The density of each structural isomer is shown to have ad ifferent value, which indicates that the composition of isomers should be determined in applying the density values of a isomer mixture.
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