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the large retailer ASDA (part of the Walmart Group) and Central England Co op in the UK, meaning the use of the very low GWP Opteon XL range is now a valid choice for retailers to consider.
A study performed by Wave Refrigeration, based on their own practical experience working with ASDA and other international retailers, looked at the use of the very low GWP Opteon XL products compared to the various available R744 technologies, namely FGB/Booster, internal heat exchanger (IHX), parallel compression and Ejector. Wave considered standard and small sized supermarkets (~2000m2
and 300-500m2
retail
area) in three locations representing the range of climatic conditions found across Europe (Helsinki, Finland, Leicester, UK & Sevilla, Spain). Using an annual leak rate (ALR) of 5%, a level achieved by responsible retailers across Europe, the very low GWP of Opteon XL20 and Opteon XL40 greatly reduces the contribution of direct refrigerant emissions. This combined with improved energy performance delivered by Opteon XL refrigerants result in the total emissions being 12-13% lower in Sevilla and Leicester, and even in the cooler low carbon power generation location of Helsinki, 6-8% lower than those produced from the use of the equivalent optimal R744 technology. 10-Year Life Cycle Cost (Thousands, €) comparison for a standard supermarket format (~2000m² sales area with design loads of 160 kW medium temperature/30 kW low temperature) As there is now an alternative low emissions
technology to match or reduce total emissions from R744 technologies, the cost element now becomes a relevant and important consideration.
The study deduced that the use of the
Opteon XL technology provides the lowest CAPEX (up to 11% lower) and maintenance costs (up to 15% lower), but the most significant cost saving over a 10-year period is from the lower energy consumption (up to 15% lower).
Combining these elements give significantly lower 10-year Life Cycle Costs – 11-13% lower in Sevilla and Leicester, and even in the low- cost power generation location of Helsinki, 5-7% lower than using the equivalent optimal R744 technology. The inherent lower energy efficiency and complexity of R744 systems has therefore left many question marks as to whether this
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10-Year Life Cycle Cost (Thousands, €) comparison for a standard supermarket format (~2000m² sales area with design loads of 160 kW medium temperature/30 kW low temperature).
10-Year total emissions vs 10-year LCC and CAPEX comparison between Opteon XL and R-744 Technologies for a standard supermarket located in Sevilla, Leicester & Helsinki.
technology is indeed the best choice. The introduction of very low GWP Opteon XL refrigerants has been proven to be a viable alternative to R404A and R744 in both standard and small supermarket refrigeration applications.
The practical experience from installations have shown improved energy performance, whilst maintaining similar equipment costs,
maintaining system simplicity and reliability compared with R404A, with the lowest 10-year life cycle cost, lowest 10-year total emissions and lowest cost per TCO2
e reduction when
compared to the optimum R744 technology choice over a wide range of climatic conditions.
The full white paper is available from here:
https://bit.ly/3dhYUdo
June 2020 17
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