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  2. 2,3,3,3-Tetrafluoropropene - Wikipedia

    en.wikipedia.org/wiki/2,3,3,3-Tetrafluoropropene

    R-1234yf is also a component of zeotropic refrigerant blend R-454B. HFO-1234yf has a GWP less than carbon dioxide, [4] [2] itself 1,430 times less potent than R-134a. [5] For this reason, 2,3,3,3‑tetrafluoropropene is the pre-eminent replacement for R-134a in vehicular air conditioners. As of 2022, 90% of new U.S. vehicles are estimated to ...

  3. trans-1,3,3,3-Tetrafluoropropene - Wikipedia

    en.wikipedia.org/wiki/Trans-1,3,3,3-tetrafluoro...

    trans-1,3,3,3-Tetrafluoropropene (HFO-1234ze(E), R-1234ze(E)) is a hydrofluoroolefin. It was developed as a "fourth generation" refrigerant to replace fluids such as R-134a, as a blowing agent for foam and aerosol applications, and in air horns and gas dusters. [3] The use of R-134a is being phased out because of its high global warming ...

  4. R-454B - Wikipedia

    en.wikipedia.org/wiki/R-454B

    Because of its reduced global warming potential (GWP), R-454B is intended to be an alternative to refrigerant R-410A in new equipment. [2] [3] [4] R-454B has a GWP of 466, which is 78 percent lower than R-410A's GWP of 2088. [2] R-454B is non-toxic and mildly flammable, with an ASHRAE safety classification of A2L. In the United States, it is ...

  5. Barbara Haviland Minor - Wikipedia

    en.wikipedia.org/wiki/Barbara_Haviland_Minor

    Barbara Haviland Minor is an American chemical engineer, known for the development of refrigerants.She was technical leader for chemical company DuPont in the development of R-1234yf, [1] a refrigerant which, as of 2018, was used in 50% of all new vehicles produced by original equipment manufacturers, [2] and which represented an important contribution to countering global warming.

  6. R-1234yf - Wikipedia

    en.wikipedia.org/?title=R-1234yf&redirect=no

    This page was last edited on 28 July 2010, at 16:35 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...

  7. How much should you have in your 401(k)? Here's how your ...

    www.aol.com/finance/average-401k-balance-by-age...

    How America Saves in 2024 [PDF], Vanguard. Accessed December 11, 2024. Figure 1. Median Household Income and Percent Change by Selected Characteristics [PDF], U.S. Census Bureau. Accessed December ...

  8. 5 races to keep on your radar in early 2025 - AOL

    www.aol.com/5-races-keep-radar-early-110000399.html

    Trump chose Rep. Elise Stefanik (R-N.Y.) to be his ambassador to the U.N., which will prompt a special election to fill her seat in New York’s 21 st Congressional District. A special election ...

  9. List of refrigerants - Wikipedia

    en.wikipedia.org/wiki/List_of_refrigerants

    According to ASHRAE standard 34, the R-number of a chemical refrigerant is assigned systematically according to its molecular structure and has between two and four digits. If there are carbon -carbon multiple bonds , there are four digits in all: the number of these bonds is the first digit and the number of carbon atoms minus one (C-1) is next.

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