Conversion de systèmes frigorifiques de supermarchés du R404A vers le R449A (en anglais)

Deux exemples de conversion de systèmes frigorifiques de supermarchés du R404A vers le R449A.

The existing R404A refrigeration system of a Waitrose supermarket located in Holsworthy (UK) has been retrofitted with R449A refrigerant (HFO/HFC blend of R32, R125, R134a and R1234yf). R449A has a rather high GWP (1397) but significantly lower than R404A’s GWP (3922) and complies with EU F-gas Regulation requirements. The refrigeration system consists of two high temperature packs and one low temperature pack connected to 27 display cabinets and 4 cold rooms. No components or oil changes were required, making the retrofit very fast and straightforward.

During the monitoring period – two weeks before the retrofit and then three weeks after the retrofit – the high temperature systems energy consumption was reduced by 8.7%. For the low temperature system, the energy consumption was reduced by 3%. For the total refrigeration system, this equates to a reduction in energy consumption of 6.6%.

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Furthermore, a paper recently published in the International Journal of Refrigeration presents the measurements of a light retrofit replacement of R404A using R449A in a medium temperature indirect refrigeration system (secondary fluid temperature at the evaporator outlet between -9 and -4?°C). It shows that with a slight expansion device adjustment and 4% increase of refrigerant charge, R449A can be used in this refrigeration system designed for R404A because of its suitable thermodynamic properties and acceptable maximum discharge temperature. At a secondary fluid temperature at condenser inlet of 30?°C, the COP of R449A nearly matches that of R404A (both were between 1.9 and 2.2), despite having approximately 13% lower cooling capacity.


Pavel Makhnatch et al. “Retrofit of lower GWP alternative R449A into an existing R404A indirect supermarket refrigeration system”. International Journal of Refrigeration Vol. 76 (2017): 186-192