[Equest-users] LEED review comments for System 5 heating source

[Carol Gardner]

Lan,

Since you said that your rooftop unit which is providing your outside air
uses gas, I think you have modeled it correctly. Something you might want to
do is look at using a different thermostat schedule for your electric
resistance heaters, It sounds like it might be justifiable to set them to
meet a lower heating temperature. As long as you keep the schedule for them
the same between the baseline and the proposed building you should be okay..

Carol



On Thu, Jun 30, 2011 at 2:48 PM, Paul Diglio <paul.diglio at sbcglobal.net>wrote:

> Lan:
>
> 90.1-2007 requires a system 5 with a fossil fuel hot water boiler as you
> have modeled, but in 90.1-2007 Table G3.1 Number 10 HVAC Systems Base
> Building Performance column it states that you need to meet any
> system-specific requirements in Section G3.1.3.
>
> In G3.1.3.2, it states that for system 5, the boiler plant shall use the
> same fuel as the proposed design, which in your case is electric resistance
> and compressor heat pump energy.  I would model electric hot water boilers.
>
> Paul Diglio
>
> ------------------------------
> *From:* "Li, Lan" <lli at sbmce.com>
> *To:* equest-users at lists.onebuilding.org
> *Sent:* Thu, June 30, 2011 4:24:27 PM
> *Subject:* [Equest-users] LEED review comments for System 5 heating source
>
>  Dear eQuesters,
>
>
>
> I just got LEED review comments for my project. Our proposed design is VRF
> system with roof top unit providing ventilation air. Roof top unit is using
> gas as heating source. There are misc. elec. heaters in the building for
> places like entries. I interpreted my building heating source as “electric
> hybrid” and used hot water fossil fuel boiler as my base design. The
> comments I got read as the follows:
>
> *Section 1.1.A of the form indicates that the primary heating source is
> fossil fuel. However, the electric heating energy use reported in Table
> EAp2-5 for the Proposed Case exceeds the fossil fuel heating energy use.
> Please verify that the correct heating source has been selected. If electric
> heating is the primary heating source, please change the Baseline system
> type accordingly. Provide updated simulation results and a revised
> Prerequisite Form as necessary.*
>
> I couldn’t find an official definition either on LEED reference book or
> 90.1. What is your take on this?
>
> Your input is highly appreciated! Thank you very much!
>
> Lan
>
> *  *
>
>
>
>
>
> *Lan Li, PE, LEED AP BD+C*
>
> *Mechanical Engineer*
>
> *Scheeser Buckley Mayfield LLC**                                     ***
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-- 
Carol Gardner PE
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