Thermal diffusivity of the alternative refrigerant R152a

被引:3
|
作者
Kruppa, B [1 ]
Straub, J [1 ]
机构
[1] TECH UNIV MUNICH,LEHRSTUHL THERMODYNAM A,D-80333 MUNICH,GERMANY
关键词
critical region; light scattering; refrigerants; R152a; thermal diffusivity; transport properties;
D O I
10.1007/BF02575135
中图分类号
O414.1 [热力学];
学科分类号
摘要
The thermal diffusivity of R152a was measured by dynamic light scattering. We have developed an apparatus which enables us to apply both homodyne and heterodyne light-scattering techniques allowing a wide region of state to be investigated. A total of 300 data points was obtained along the critical isochore, in both coexisting phases and on seven isotherms with densities rnd temperatures ranging from 50 to 1000 kg . m(-3) and 290 to 425 K, respectively. The uncertainty of the measurements lies between 0.5 and 5%. The thermal diffusivity values cover a range of over four orders of magnitude and include the region around the vapor-liquid critical point. Other measured properties are temperature, pressure, and refractive index as well as the critical parameters T-c and p(c).
引用
收藏
页码:807 / 823
页数:17
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