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NC-2009 EAc4:Enhanced Refrigerant Management

which refrigerant

Our system has 2 different refrigerant types. One type in the compressor and another type in the refrigeration circuit. Do we take into account both refrigerants or only the refrigerant in the compressor? If we need to take both refrigerants into account, how do we calculate this?

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Ante Vulin
Sustainability Manager
YR&G
LEEDuser Basic Member
55 thumbs up

Wed, 09/19/2012 - 13:53

You must account for both types of refrigerant. In the calculations for this system, I think you will need to calculate the LCGWP and LCODP for each refrigerant., and then add those numbers to get the system LCGWP and LCODP. For example, if the total refrigerant charge is 2 lbs/ton, and the individual charges are 1.2 lbs/ton of Refrigerant X and 0.8 lbs/ton of Refrigerant Y, the LCGWP/LCODP of Refrigerant X should be calculated with the appropriate properties of Refrigerant X and Rc = 1.2. This approach makes sense to me, but I haven't yet had to document a multiple-refrigerant system like this for LEED. If anyone else has, please chime in.

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