Authors:

Alex Author

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About Paper:

The institution of new legislation restricting the use of high global warming potential (GWP) refrigerants has prompted the HVAC&R industry to transition from high GWP hydrofluorocarbons (HFCs) to lower GWP alternatives. Mixtures of refrigerants to reduce the GWP of a working fluid have proven to be one feasible alternative. However, some of these refrigerant mixtures exhibit zeotropic behavior, leading to challenges in their implementation. Fractionation during phase change, two-phase heat transfer losses due to temperature suppression, and influences of non-uniform oil solubility on compressor performance have been studied previously. However, an experiment analyzing and comparing various in-line measurement devices to characterize these behaviors in a vapor compression cycle, which would reduce trepidation surrounding broad scale implementation, has not been carried out. A comprehensive investigation of these behaviors, along with a comparison of varying sensor techniques to determine the necessity of instituting high-accuracy measurement systems in the field, is to be carried out. In order to accurately quantify tradeoffs in cost and accuracy of the sensors that could be applied in the field, a highly accurate measurement reference system is needed. This report focuses on determining the most accurate and feasible reference measurement technique and designing a methodology to carry this measurement out in the context of the analysis of low-GWP zeotropic mixtures with compressor lubricants in vapor compression cycles. The high-level measurement techniques provided in this work yield an analysis of zeotropic refrigerant behavior in vapor compression cycles, facilitating further implementation of low GWP refrigerants into the field. Keywords: Zeotropic Refrigerants; Fractionation; Vapor Compression Cycle; Measurement Systems

Source:

Purdue University / 2024

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Co-authors:

Alex Author