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Performance evaluation of a water-to-water heat pump using the new low global warming potential mixture R-1234yf/R-600a (0.85/0.15) as drop-in replacement for R134a refrigerant.

Number: 2329

Author(s) : LOMBARDO G., JEONG Y., ROSSI S., MENEGAZZO D., CARLI M. de, FEDELE L., BOBBO S., KIM M. S.

Summary

The stringent regulations outlined in the F-gas Regulation and the Kigali Amendment to the Montreal Protocol have resulted in an intense search for alternatives to fluorinated greenhouse gases in air conditioning and refrigeration applications. This pursuit has given rise to a fourth generation of environmentally friendly refrigerants, including mainly natural refrigerants (such as NH3, CO2, and hydrocarbons HCs) and hydrofluoroolefins (HFOs). However, the identification of a long-term refrigerant characterized by zero Ozone Depletion Potential (ODP) and significantly low Global Warming Potential (GWP) remains a challenge for many applications. Heat pumps, particularly in the context of residential applications aligned with the objectives of the REPowerEU and Fit for 55 goals, hold substantial potential. Nonetheless, the prevalent HFC refrigerant for these applications, i.e. R134a, significantly contributes to climate change with its high GWP of 1530. In this regard, this study investigates the performance of the low-GWP HFO/HC near azeotropic mixture R1234yf/R600a (0.85/0.15) as a refrigerant in a water-to-water heat pump, comparing it with R134a. Tests were conducted under heating conditions with different combinations of heat sink and heat source temperatures, ranging from 35°C to 55°C and from 7°C to 15°C, respectively. The results reveal that, at the same compressor rotational speed of 3000 rpm, the direct replacement of R134a with R1234yf/R600a can yield a higher heating capacity, particularly at elevated temperatures at the heat sink supply. The Coefficient of Performance (COP) of the mixture varies from -11% to 7.2% compared to R134a, albeit with a lower volumetric heating effect (VHE). Overall, the drop-in replacement of R134a with the R1234yf/R600a mixture showcases its potential, particularly in residential applications where high-temperature emission systems, such as radiators, are prevalent.

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  • Original title: Performance evaluation of a water-to-water heat pump using the new low global warming potential mixture R-1234yf/R-600a (0.85/0.15) as drop-in replacement for R134a refrigerant.
  • Record ID : 30033175
  • Languages: English
  • Subject: HFCs alternatives
  • Source: 2024 Purdue Conferences. 19th International Refrigeration and Air-Conditioning Conference at Purdue.
  • Publication date: 2024/07/17

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