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Next generation of refrigerants for residential heat pump systems

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Next generation of refrigerants for residential heat pump systems ( next-generation-refrigerants-residential-heat-pump-systems )

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Abstract The increasing concentration of greenhouse gases (GHG) in the atmosphere arising from human activities is unquestionably taking its toll on the environment with severe consequences that cannot be ignored. It is therefore necessary to take measures to avoid or reduce GHG production and release. In this scope, the 2015 F-gas regulation aims at limiting the contribution of the refrigeration industry to the global warming effect by phasing-down refrigerants with high global warming potential (GWP). This work contributes to this effort by analysing a number of refrigerants, i.e. R32, R152a, R290, R1270, R1234yf and R1234ze(E) that could substitute the current R410A in a 10 kW domestic heat pump typically used in a single family house in Sweden. An EES model was thus created and the relevant outputs chosen to compare the refrigerants’ options are the volumetric heating capacity, the coefficient of performance (COP), Seasonal coefficient of performance (SCOP) – obtained by the method found in the Standard BS EN 14825:2012, the discharge temperature, and the Total Equivalent Warming Impact (TEWI) factor. The reductions observed for TEWI are remarkable. The overall lowest TEWI is obtained by refrigerants having the lowest GWPs, i.e. the HCs, of 54.2% and 54.6% for R1270 and R290 respectively. They are followed by R1234yf and R1234ze(E), with reductions of 52.5% and 53.7% respectively. R152a entails a reduction of 53.6%, due to its higher SCOP. R32 shows a reduction of 40.8%. Other parameters such as thermodynamic characteristics and safety issues are also considered during the analysis. Keywords—CO2, GHG, Heat pump, R410A, refrigerant, TEWI i

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Next generation of refrigerants for residential heat pump systems

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