<div>All,</div><div><br></div><div>below is a draft letter to the EA Credit 1 TAG chair. I welcome any edits, or critiques, and if anyone would like to be a co-signer of the letter, please let me know.</div><div><br></div>
<div>Thanks,</div><div><br></div><div>--</div><div>Karen</div><div><br></div><div><br></div><div>It has come to our attention from a posting on the eQuest list-serve that a fellow energy-modeling professional has been asked to model proposed design and baseline design ventilation rates differently where the proposed design model utilizes demand controlled ventilation. We have searched the ASHRAE 90.1 documentation as well as the LEED reference documentation and consistently find the requirement that baseline ventilation rates be modeled the same as the proposed design, and that credit can be taken for demand controlled ventilation.</div>
<div><br></div><div>We understand that large energy savings can be gained from demand controlled ventilation and that in certain cases, 'gaming' of the system could result in abnormally high ventilation rates for the baseline design, while the DCV system keeps ventilation rates low in the proposed design, however, our main concern is that energy modelers are being made aware of changes to guidelines during the design review process. At this stage, the energy modeler has already completed a significant amount of work in preparing the proposed and baseline design energy models, and all associated documentation. Changing the baseline design ventilation rates requires re-modeling of the building and increases the likelihood that the project will have to challenge a 'rejected' result if the LEED reviewer is not satisfied with the energy modeler's response and modeling changes.</div>
<div><br></div><div>We feel that it may be time to develop modeling guidelines for demand controlled ventilation, and that these guidelines should be developed, released, and required in a similar fashion to the district energy guidelines published by LEED for NC 2.2 Furthermore, we feel that any changes made to EA Credit 1 energy modeling guidelines should be made with adequate notice to the energy modeling community.</div>
<div><br></div><div>Thank you for your consideration on this issue,</div><div><br></div><div>--</div><div>Karen Walkerman</div><div>Second Law</div><div><br></div><div><br></div>