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Carbon dioxide emission implications if hydrofluorocarbons are regulated: a refrigeration case study
Paul Blowers1, James M Lownsbury
1Department of Chemical and Environmental Engineering, The University of Arizona, Tucson, Arizona 85721-0011, USA. blowers@email.arizona.edu
Environmental Science & Technology
|January 7, 2010
Summary
New regulations for hydrofluorocarbons (HFCs) might worsen climate change. A life cycle assessment shows replacements could increase greenhouse gas emissions, impacting global warming potential.
Area of Science:
- Environmental Science
- Climate Change Studies
- Chemical Engineering
Background:
- Hydrofluorocarbons (HFCs) are potent greenhouse gases with significant global warming potential.
- The U.S. is considering regulations to mitigate HFCs' climate impact.
- There is a need to evaluate the environmental trade-offs of HFC alternatives.
Purpose of the Study:
- To assess the life cycle greenhouse gas emissions of a hydrofluoroether (HFE) as a potential HFC replacement.
- To compare the direct and indirect carbon dioxide equivalent emissions of the HFE against a current HFC and a historical refrigerant.
- To inform regulatory decisions regarding HFC phase-downs.
Main Methods:
- A gate-to-grave life cycle assessment (LCA) was employed.
- Greenhouse gas emissions, including direct and indirect CO2 equivalent emissions, were quantified.
- Comparative analysis was conducted between the HFE, an HFC, and a historical refrigerant.
Main Results:
- The evaluated hydrofluoroether (HFE) exhibited trade-offs in direct and indirect greenhouse gas emissions.
- Under certain scenarios, the HFE replacement could lead to higher overall carbon dioxide equivalent emissions compared to the HFC.
- The study highlights potential unintended consequences of HFC regulations.
Conclusions:
- Current regulatory considerations for HFCs, focusing solely on direct emissions, may inadvertently increase global climate change.
- A comprehensive life cycle assessment is crucial for evaluating the true climate impact of refrigerant alternatives.
- Policy decisions should account for both direct and indirect emissions to ensure effective climate change mitigation.
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