RESNET Proposes Standard Amendment on Auxiliary Electric Energy of Ground Source Heat Pumps – Public Review and Comment Process Open Through July 27, 2011

June 27th, 2011 - Posted by RESNET under Hot News

There were errors in the original amendment on Auxiliary Electric Energy of Ground Source Heat Pumps. First, the AHRI/ISO 13256 standard rating process includes an allowance for fan internal static pressure, which was double-counted in the original proposal. This amendment corrects the value from 0.5 W/CFM to 0.2 W/CFM, to reflect only fan external static pressure. Second, the AHRI/ISO 13256 standard rating process includes an allowance for pump internal static pressure, which was double-counted in the original proposal. This amendment corrects the added pump energy by subtracting a reasonable allowance for the rated pump energy under test conditions, before adding the actual pump energy as installed. Third, this amendment adds an efficiency adjustment that may be used for projected ratings in the absence of detailed pre-construction information about the pump. Finally, this amendment states explicitly that, for calculating adjusted equipment efficiency, the additional external fan energy GSHPfanESP must also be added to the rated heating capacity and subtracted from the rated cooling capacity.

The RESNET Technical Committee has proposed an amendment to RESNET standards to correct the provisions for ground source heat pumps.

The amendment is undergoing an ANSI compliant public review and comment process. Interested parties are encouraged to comment on the proposed amendment. Public comments on the proposed amendment will be accepted until July 27, 2011. To submit your comments, click here. Comments are posted real time and you will be able to review comments that were submitted by clicking here. To download the amendment, click here. Only comments made through the online system will be accepted.

After the comment period, the appropriate RESNET committee will consider and document each of the comments submitted and make appropriate changes. The revised proposed amendments then will be submitted to the RESNET Standards Committee who will review the public comment process then recommend to the RESNET Board for adoption.

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