[Equest-users] Reply： The problem of minimum equipment efficiency requirement of Ashrae 90.1-2007

[赵永青]

Hi,Julien 

I understand his meaning is keep a constant efficiency and I know the flat efficiency in equest is a curve that is y=x, but I can't  confirm if a constant efficiency is Ashrae 90.1-2007's original intent.

------------------
 Yongqing Zhao
 Changsha Green Building & Energy Saving Technology CO.,LTD
NO.438,Shaoshan Road,Changsha,Hunan,China
Telephone:13574805636
 Email:zhaoyongqing1987 at 126.com
          503271081 at qq.com 



 




------------------ 原始邮件 ------------------
发件人: "Julien Marrec";<julien.marrec at gmail.com>;
发送时间: 2015年5月24日(星期天) 晚上8:19
收件人: "赵永青"<503271081 at qq.com>; 
抄送: "equest-users at lists.onebuilding"<equest-users at lists.onebuilding.org>; 
主题: Re: [Equest-users] The problem of minimum equipment efficiency requirement of Ashrae 90.1-2007



Hey,


He's saying that you need to make sure that the curve boiler-fPLR gives you a constant efficiency. As far as I remember, the default atmospheric curve from equest is like this.
Don't be confused by "flat". A flat efficiency curve is when you plot efficiency=f(PLR). In equest, it should be a curve that is y=x


Look at the curve you used.


Best,
Julien

Envoyé de mon iPhone

Le 24 mai 2015 à 11:27, "赵永青" <503271081 at qq.com> a écrit :


I get the energy model comments from LEED reviewer as following:


The narrative response indicates that the Baseline boiler has been modeled utilizing operating performance curves and a boiler HIR of 1.25. However, since the boiler operation HIR is based on the performance curves, the HIR is less than 1.25 in the part-load condition, which is inappropriate. Revise the Baseline boilers to include a flat efficiency of 80% for all part-loads. Provide eQuest input files or screen shots verifying the boiler efficiency has been modeled as required.
 <545E22AD at FA528147.9F996155>
However, I can not understand it very much. The minimum equipment efficiency requirement(80 % Et) of Ashrae 90.1-2007 should be base on full load condition.Why the LEED reviewer raise such a question?Any insight is appreciate!!


Thanks
------------------
 Yongqing Zhao
 Changsha Green Building & Energy Saving Technology CO.,LTD
NO.438,Shaoshan Road,Changsha,Hunan,China
Telephone:13574805636
 Email:zhaoyongqing1987 at 126.com
          503271081 at qq.com 



 

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