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HFO-1336mzz-Z: high temperature chemical stability and use as a working fluid in organic Rankine cycles.

Number: pap. 2550

Author(s) : KONTOMARIS K. K.

Summary

Regulatory pressure has been mounting globally to address the issue of climate change. Hydrofluorocarbons (HFCs) with high global warming potentials (GWPs), used as working fluids across many applications, are coming under increasing scrutiny because they are forecast to become significant contributors to global warming in the future. Therefore, there is a need for low GWP working fluids for many applications for which HFCs have been historically preferred. This paper evaluates a new developmental refrigerant, Hydro-Fluoro-Olefin HFO-1336mzz-Z (cis-CF3CH=CHCF3), as a potential working fluid for Organic Rankine Cycles (ORC). It has a favorable toxicity profile based on testing to date and it is non-flammable at both 60°C and 100°C. It offers both non-flammability and a very low one-hundred year GWP of 2, thus discrediting an early stereotype about fluids based on HFOs. Even more surprisingly, HFO-1336mzz-Z remained chemically stable in the presence of carbon steel, copper, aluminum, air and moisture up to the maximum temperature tested of 250°C despite its unsaturated chemical nature. It also remained stable to stereo-isomerization in the presence of carbon steel, copper and aluminum at 250°C despite the thermodynamic driving force for isomerization to the more energetically favored HFO-133mzz-E isomer. The stability of HFO-1336mzz-Z was found to be significantly higher than other saturated and unsaturated working fluids. HFO-1336mzz-Z has a normal boiling point of 33.4°C and a relatively high critical temperature of 171.3°C, which result in relatively low vapor pressures and high cycle energy efficiencies. The performance of HFO-1336mzz-Z in subcritical and transcritical power cycles at conditions representative of potential applications was evaluated through computational modeling. Subcritical Rankine cycles with recuperators operating between an evaporating temperature of 160°C and a condensing temperature of 25°C with HFO-1336mzz-Z could reach net cycle efficiencies of 25%. HFO-1336mzz-Z could enable more environmentally sustainable ORC platforms to generate power from available heat at higher temperatures and with higher energy efficiencies than incumbent working fluids.

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Pages: 10 p.

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Details

  • Original title: HFO-1336mzz-Z: high temperature chemical stability and use as a working fluid in organic Rankine cycles.
  • Record ID : 30013350
  • Languages: English
  • Subject: General information
  • Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2014/07/14

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