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Forum discussion

NC-2009 EAp2:Minimum Energy Performance

Energy Recovery Bypass

Hi, I am working on a building which includes DOAS units with energy recovery cores on the proposed systems. The baseline systems do not require energy recovery per ASHRAE 90.1-2007. As part of the design review comments we received, we were asked to indicate the bypass mechanism used to bypass the energy recovery medium during mild conditions. This is part of the prescriptive requirements of ASHRAE. The proposed ERVs are core type and do not have any bypass dampers (or mechanism). Does that mean that the proposed systems do not meet the requirements of ASHRAE? I am a little confused here since the core type (RenewAire for instance) ERVs are very commonly used. Is it okay to say that there is no bypass mechanism in the physical systems and hence it hasn't been modeled as a response to the comment?

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