Authors:

Amelia C Jaffe

Date Created:

Not specified

Course Title:

Professor:

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About Paper:

Current hydrofluorocarbon (HFC) refrigerants are estimated to contribute to about 2% of greenhouse gas emissions. Recent legislation limiting the allowable global warming potential (GWP) of refrigerants has increased interest in more environmentally friendly options. Alternatives to HFCs include hydrofluoroolefins (HFOs), hydrocarbons (HCs), and natural refrigerants such as CO2. Some of the most promising refrigerants are zeotropic mixtures due to their low-GWPs and ability to perform similarly to conventional refrigerants. These blends exhibit a tendency to undergo composition shift during phase change which is not well understood. To study this behavior, a pumped two-phase loop test stand with a condenser section consisting of several measurement instruments was used. Samples of R454C, a HFC/HFO blend of R32 and R1234yf, were removed from circulation after the condenser section and then passed through a gas chromatograph. Comparing composition shifts in R454C with and without lubricants helps to characterize R454C and determine the conditions for its optimal performance. Future work will involve repeating the experiments with other zeotropic mixtures containing HCs and CO2. Keywords: [no keywords provided]

Source:

Purdue University / 2025

Topics:

No topics listed

Co-authors:

Amelia C Jaffe