Hydrofluorocarbon

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Neil D. Mathur - One of the best experts on this subject based on the ideXlab platform.

  • Colossal barocaloric effects near room temperature in plastic crystals of neopentylglycol
    Nature Communications, 2019
    Co-Authors: Pol Lloveras, Enric Stern-taulats, Ph. Negrier, Araceli Aznar, A Avramenko, Maria Barrio, Catalin Popescu, Antoni Planes, Lluís Mañosa, Neil D. Mathur
    Abstract:

    There is currently great interest in replacing the harmful volatile Hydrofluorocarbon fluids used in refrigeration and air-conditioning with solid materials that display magnetocaloric, electrocaloric or mechanocaloric effects. However, the field-driven thermal changes in all of these caloric materials fall short with respect to their fluid counterparts. Here we show that plastic crystals of neopentylglycol (CH3)2C(CH2OH)2 display extremely large pressure-driven thermal changes near room temperature due to molecular reconfiguration, that these changes outperform those observed in any type of caloric material, and that these changes are comparable with those exploited commercially in Hydrofluorocarbons. Our discovery of colossal barocaloric effects in a plastic crystal should bring barocaloric materials to the forefront of research and development in order to achieve safe environmentally friendly cooling without compromising performance.

  • Colossal barocaloric effects near room temperature in plastic crystals of neopentylglycol
    Nature Communications, 2019
    Co-Authors: Pol Lloveras, Enric Stern-taulats, Ph. Negrier, Araceli Aznar, A Avramenko, Maria Barrio, Catalin Popescu, Antoni Planes, Lluís Mañosa, Neil D. Mathur
    Abstract:

    There is great interest, in refrigeration technology, in replacing harmful volatile Hydrofluorocarbons with solid materials. Here the authors show that commercially available plastic crystal neopentylglycol displays colossal and reversible barocaloric effects comparable with those exploited in Hydrofluorocarbons, which make it suitable for application. There is currently great interest in replacing the harmful volatile Hydrofluorocarbon fluids used in refrigeration and air-conditioning with solid materials that display magnetocaloric, electrocaloric or mechanocaloric effects. However, the field-driven thermal changes in all of these caloric materials fall short with respect to their fluid counterparts. Here we show that plastic crystals of neopentylglycol (CH_3)_2C(CH_2OH)_2 display extremely large pressure-driven thermal changes near room temperature due to molecular reconfiguration, that these changes outperform those observed in any type of caloric material, and that these changes are comparable with those exploited commercially in Hydrofluorocarbons. Our discovery of colossal barocaloric effects in a plastic crystal should bring barocaloric materials to the forefront of research and development in order to achieve safe environmentally friendly cooling without compromising performance.

Akimichi Yokozeki - One of the best experts on this subject based on the ideXlab platform.

  • Solubility and diffusivity of Hydrofluorocarbons in room-temperature ionic liquids
    AIChE Journal, 2006
    Co-Authors: Mark B. Shiflett, Akimichi Yokozeki
    Abstract:

    Gaseous absorption measurements of Hydrofluorocarbons (trifluoromethane, difluoromethane, pentafluoroethane, 1,1,1,2-tetrafluoroethane, 1,1,1-trifluoroethane, and 1,1-difluoroethane) in l-n-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) and 1-n-butyl-3-methylimidazolium tetrafluoroborate ([bmim][BF4]) were performed using a gravimetric microbalance at various isothermal conditions (temperatures between 283.15 and 348.15 K) and at pressures < 2 MPa. This report shows for the first time the solubility and diffusivity data for the Hydrofluorocarbons in room-temperature ionic liquids and surprisingly large differences in the solubility among the Hydrofluorocarbons. Experimental gas solubility data were successfully correlated with well-known solution models (Margules, Wilson, and NRTL activity coefficient equations). Diffusivities obtained from the time-dependent absorption data were well analyzed using a diffusivity model developed in this study. The present solubility and diffusivity data are also compared with those of CO2, studied in our previous study. © 2005 American Institute of Chemical Engineers AIChE J, 2006

  • Solubility and viscosity of refrigerant/lubricant mixtures: Hydrofluorocarbon/alkylbenzene systems
    International Journal of Refrigeration-revue Internationale Du Froid, 2002
    Co-Authors: Katsuya Takigawa, Stanley I. Sandler, Akimichi Yokozeki
    Abstract:

    Alkylbenzenes have been found to be applicable in refrigeration systems with Hydrofluorocarbons (HFCs). However, little thermophysical property data for HFC/alkylbenzene mixtures have been reported. In this study, the solubility of HFCs in alkylbenzenes, and the viscosity of HFC/alkylbenzene mixtures were measured. The solubility data were correlated with a cubic equation of state with a single adjustable parameter. The viscosity data were correlated with an empirical equation with a simple mixing rule. The solubility of HFCs in alkylbenzenes and viscosity of these mixtures may be predicted with these models.

  • solubility and viscosity of refrigerant lubricant mixtures Hydrofluorocarbon alkylbenzene systems
    International Journal of Refrigeration-revue Internationale Du Froid, 2002
    Co-Authors: Katsuya Takigawa, Stanley I. Sandler, Akimichi Yokozeki
    Abstract:

    Alkylbenzenes have been found to be applicable in refrigeration systems with Hydrofluorocarbons (HFCs). However, little thermophysical property data for HFC/alkylbenzene mixtures have been reported. In this study, the solubility of HFCs in alkylbenzenes, and the viscosity of HFC/alkylbenzene mixtures were measured. The solubility data were correlated with a cubic equation of state with a single adjustable parameter. The viscosity data were correlated with an empirical equation with a simple mixing rule. The solubility of HFCs in alkylbenzenes and viscosity of these mixtures may be predicted with these models.

Clare P. Grey - One of the best experts on this subject based on the ideXlab platform.

Pol Lloveras - One of the best experts on this subject based on the ideXlab platform.

  • Colossal barocaloric effects near room temperature in plastic crystals of neopentylglycol
    Nature Communications, 2019
    Co-Authors: Pol Lloveras, Enric Stern-taulats, Ph. Negrier, Araceli Aznar, A Avramenko, Maria Barrio, Catalin Popescu, Antoni Planes, Lluís Mañosa, Neil D. Mathur
    Abstract:

    There is currently great interest in replacing the harmful volatile Hydrofluorocarbon fluids used in refrigeration and air-conditioning with solid materials that display magnetocaloric, electrocaloric or mechanocaloric effects. However, the field-driven thermal changes in all of these caloric materials fall short with respect to their fluid counterparts. Here we show that plastic crystals of neopentylglycol (CH3)2C(CH2OH)2 display extremely large pressure-driven thermal changes near room temperature due to molecular reconfiguration, that these changes outperform those observed in any type of caloric material, and that these changes are comparable with those exploited commercially in Hydrofluorocarbons. Our discovery of colossal barocaloric effects in a plastic crystal should bring barocaloric materials to the forefront of research and development in order to achieve safe environmentally friendly cooling without compromising performance.

  • Colossal barocaloric effects near room temperature in plastic crystals of neopentylglycol
    Nature Communications, 2019
    Co-Authors: Pol Lloveras, Enric Stern-taulats, Ph. Negrier, Araceli Aznar, A Avramenko, Maria Barrio, Catalin Popescu, Antoni Planes, Lluís Mañosa, Neil D. Mathur
    Abstract:

    There is great interest, in refrigeration technology, in replacing harmful volatile Hydrofluorocarbons with solid materials. Here the authors show that commercially available plastic crystal neopentylglycol displays colossal and reversible barocaloric effects comparable with those exploited in Hydrofluorocarbons, which make it suitable for application. There is currently great interest in replacing the harmful volatile Hydrofluorocarbon fluids used in refrigeration and air-conditioning with solid materials that display magnetocaloric, electrocaloric or mechanocaloric effects. However, the field-driven thermal changes in all of these caloric materials fall short with respect to their fluid counterparts. Here we show that plastic crystals of neopentylglycol (CH_3)_2C(CH_2OH)_2 display extremely large pressure-driven thermal changes near room temperature due to molecular reconfiguration, that these changes outperform those observed in any type of caloric material, and that these changes are comparable with those exploited commercially in Hydrofluorocarbons. Our discovery of colossal barocaloric effects in a plastic crystal should bring barocaloric materials to the forefront of research and development in order to achieve safe environmentally friendly cooling without compromising performance.

Xuekun Fang - One of the best experts on this subject based on the ideXlab platform.

  • china s Hydrofluorocarbon emissions for 2011 2017 inferred from atmospheric measurements
    Environmental Science and Technology Letters, 2019
    Co-Authors: Bo Yao, Xuekun Fang, Martin K. Vollmer, Stefan Reimann, Liqu Chen, Shuangxi Fang, Ronald G. Prinn
    Abstract:

    Hydrofluorocarbons (HFCs) have been widely used in China to replace ozone-depleting substances (ODSs) that must be phased out under the Montreal Protocol. Few studies have reported on HFC emissions...

  • China’s Hydrofluorocarbon Emissions for 2011–2017 Inferred from Atmospheric Measurements
    Environmental Science & Technology Letters, 2019
    Co-Authors: Bo Yao, Xuekun Fang, Martin K. Vollmer, Stefan Reimann, Liqu Chen, Shuangxi Fang, Ronald G. Prinn
    Abstract:

    Hydrofluorocarbons (HFCs) have been widely used in China to replace ozone-depleting substances (ODSs) that must be phased out under the Montreal Protocol. Few studies have reported on HFC emissions...

  • European emissions of the powerful greenhouse gases Hydrofluorocarbons inferred from atmospheric measurements and their comparison with annual national reports to UNFCCC
    Atmospheric Environment, 2017
    Co-Authors: Francesco Graziosi, Jgor Arduini, F. Furlani, Umberto Giostra, Paolo Cristofanelli, Xuekun Fang, O. Hermanssen, Chris Rene Lunder, G. Maenhout, Simon O'doherty
    Abstract:

    Abstract Hydrofluorocarbons are powerful greenhouse gases developed by industry after the phase-out of the ozone depleting chlorofluorocarbons and hydrochlorofluorocarbons required by the Montreal Protocol. The climate benefit of reducing the emissions of Hydrofluorocarbons has been widely recognised, leading to an amendment of the Montreal Protocol (Kigali Amendment) calling for developed countries to start to phase-down Hydrofluorocarbons by 2019 and in developing countries to follow with a freeze between 2024 and 2028. In this way, nearly half a degree Celsius of warming would be avoided by the end of the century. Hydrofluorocarbons are also included in the basket of gases controlled under the Kyoto Protocol of the United Nations Framework Convention on Climate Change. Annex I parties to the Convention submit annual national greenhouse gas inventories based on a bottom-up approach, which relies on declared anthropogenic activities. Top-down methodologies, based on atmospheric measurements and modelling, can be used in support to the inventory compilation. In this study we used atmospheric data from four European sites combined with the FLEXPART dispersion model and a Bayesian inversion method, in order to derive emissions of nine individual Hydrofluorocarbons from the whole European Geographic Domain and from twelve regions within it, then comparing our results with the annual emissions that the European countries submit every year to the United Nations Framework Convention on Climate Change, as well as with the bottom-up Emissions Database for Global Atmospheric Research. We found several discrepancies when considering the specific compounds and on the country level. However, an overall agreement is found when comparing European aggregated data, which between 2008 and 2014 are on average 84.2 ± 28.0 Tg-CO 2 -eq·yr −1 against the 95.1 Tg-CO 2 -eq·yr −1 reported by UNFCCC in the same period. Therefore, in agreement with other studies, the gap on the global level between bottom-up estimates of Annex I countries and total global top-down emissions should be essentially due to emissions from non-reporting countries (non-Annex I).

  • Ambient mixing ratios of chlorofluorocarbons, hydrochlorofluorocarbons and Hydrofluorocarbons in 46 Chinese cities
    Atmospheric Environment, 2012
    Co-Authors: Xuekun Fang, Daikuan Huang, Yehong Shi, Dan Wan, Min Shao
    Abstract:

    Abstract Air samples in 46 cities all over China were collected in October and November 2010, and the levels of chlorofluorocarbons (CFCs), hydrochlorofluorocarbons (HCFCs) and Hydrofluorocarbons (HFCs) were measured and are discussed in this work. In most cities, the ambient mixing ratios of CFCs were within 20% enhancements of the background values, while the levels of HCFCs and HFCs were significantly higher than the background values (P

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