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Headline

Is it time to stop using R404A?

Comment

Based on these assumptions, the direct CO2eq emissions for the three refrigerants were estimated to be 33.65, 18.07, and 0.003 Mkg for R404A, R407A, and R744, respectively. The direct emissions of R404A were approximately three times that of the lifetime indirect emissions. This is largely driven by the high GWP of R404A. Although R744 consumed on average 11% more energy than R404A, it had practically no direct emissions. Over the lifetime, R744 has a significant emissions payback. Adding direct and indirect emissions result in the LCCP shown in Figure 7. On average for the 16 cities, R407A and R744 resulted in 37% and 77% less LCCP compared to R404A, respectively. R407A is a current drop-in replacement for R404A with a significant potential for emissions reduction with minimum energy penalty. For the long-term, R744 present the greatest emissions reduction. Even if the technology advances such that a 1% annual leakage rate can be achieved, R744 still presents significant emissions reduction, as shown in Figure 8. On average; R744 system resulted in 14.2% and 4.2% LCCP reduction compared to R404A and R407A respectively. R407A with only 1% annual leakage rate showed to result in lower LCCP than R744 systems in hot climates such as Phoenix, AZ. It is noted that several market barriers exist for R744 which hinder its market penetration. Among these are first cost due to a total system changeout and energy costs as the result of higher energy consumption and peak demand charges - http://oz-chill.com

Posted date

7 November, 2013

Posted time

8:03 am

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