[Bldg-sim] How to set the loop loss as 5 or 10%?

[Esmireta]

Hi Mitchell,
Thanks for your reply!
I really don't know how the DT work. Why a little DT can give a huge rise in the energy consumption?
Further, will the GBCI reviewer question the way of setting DT to represent the loop loss? Did you give any specific explanation on the DT, or just leave it without narrative?
Thanks!
Esmi






At 2013-04-18 10:08:05,"Mitchell Dec" <mdec at glumac.com> wrote:
I usually run with no loss, then adjust the delta-t until the additional consumption matches the % stated by the guideline.

Mitch Dec
Glumac
Energy Department Manager

Sent from my Verizon Wireless 4G LTE Smartphone



----- Reply message -----
From: "Esmireta" <e2fye2 at 163.com>
To: "BLDGSIM" <bldg-sim at lists.onebuilding.org>
Subject: [Bldg-sim] How to set the loop loss as 5 or 10%?
Date: Wed, Apr 17, 2013 7:04 PM





Dear all,
As required by the district thermal energy guidance, the loop loss should be 5% for the cooling loop and 10% for the heating loop.
However, there is only DT input for the loop loss option panel. If the supply and return temperature difference is 40 F for the heating loop, the loss should be 4 F. But after I set the loss DT as 4F, the heating energy consumption will increase heavily, even 3 times of the orginal heating energy consumption.
So I wonder how it works. Does anybody have experience on it?
Thanks!
Esmi


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