PρT Experimental Measurements and Data Correlation of Pentaerythritol Esters

The new refrigerant fluids are generally not compatible with traditional mineral oils used for the lubrification of
compressors. Different typologies of oils have been proposed, such as polyalkylene glycol (PAG), alkylbenzene
(AB), and polyol ester (POE) oils. New thermodynamic models are necessary to describe well the behavior of
these fluids, but at the moment only few experimental data are available in the literature. The work presented in
this paper is part of our research program aimed to evaluate the solubility of refrigerants in commercial oils. The
density of five different pentaerythritol esters is presented, which are used as components of the commercial POE
oils (i.e., pentaerythritol ester of butyric acid (PEC4), pentaerythritol ester of valeric acid (PEC5), pentaerythritol
ester of hexanoic acid (PEC6), pentaerythritol ester of heptanoic acid (PEC7), and pentaerythritol ester of octanoic
acid (PEC8)). The experimental compressed liquid density data were correlated by means of a particular equation
that is also presented in this paper.

新型制冷剂流体通常与传统用于压缩机润滑的矿物油不相兼容。已提出了多种油类类型，例如聚乙二醇（PAG）、烷基苯（AB）和聚酯醇（POE）油。为了准确描述这些流体的行为，有必要建立新的热力学模型，但截至目前，文献中仅有少量实验数据。本文所呈现的研究成果系我方研究计划的一部分，旨在评估制冷剂在商用油中的溶解度。文中展示了五种不同戊四醇酯的密度，这些酯类作为商用POE油（即丁酸戊四醇酯（PEC4）、戊酸戊四醇酯（PEC5）、己酸戊四醇酯（PEC6）、庚酸戊四醇酯（PEC7）和辛酸戊四醇酯（PEC8））的组分。通过一种特定的方程对实验压缩液密度数据进行关联，该方程亦在本文中予以展示。