[Equest-users] Non conditioned regularly occupied space

[Singh, Arvind]

I am telling you with my experience.  The minute you include this space in your model your system type will change. You have to assigned a system  to "95,000 ft2 of regularly occupied office" and claim the saving of natural ventilation using exceptional calculation.

Arvind

From: Kushagra Juneja [mailto:maverick.kushagra at gmail.com]
Sent: Friday, August 30, 2013 10:59 AM
To: Singh, Arvind
Cc: vamshi ranga; David Eldridge; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Non conditioned regularly occupied space

Hi guys.

I somehow agree with Arvind. However, ASHRAE system type selection is based on conditioned area and not overall area.

If you think you need to claim savings for natural ventilation, the same can be done using exceptional calculation. One approach I saw and was approved by GBCI was when a HVAC system was modeled in both Baseline and Proposed Case. The schedule of Proposed Case was so adjusted, to turn the system off when the adaptive comfort temperature is met in the space in the Proposed Case. That ways, the Baseline system was still running to meet space temperatures while the Proposed system was not running and hence the savings.

There are few CIRs on this which I might be able to share in the due course.


Thanks

Kushagra


On Fri, Aug 30, 2013 at 9:01 PM, Singh, Arvind <Arvind.Singh at dnvkema.com<mailto:Arvind.Singh at dnvkema.com>> wrote:
Hi Vamshi,

Based on your sqft and fuel size you will have system type and that will be system 6 in your case. Baseline model and proposed both will need heating and cooling system for non-conditioned space. But you can set up high cooling set point for baseline and proposed model to avoid any cooling in the non-conditioned space.

Thanks,
Arvind

From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org>] On Behalf Of vamshi ranga
Sent: Friday, August 30, 2013 10:21 AM
To: David Eldridge
Cc: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Non conditioned regularly occupied space

Dear David,

The 95,000 ft2 area has only normal ceiling fans.

As I read in ASHRAE 90.1, it says, we shall model HVAC (Cooling or Heating) even if there is NO system proposed. But in this case, VRV system is proposed for 5000 ft2 area, so how shall I proceed with the remaining 95,000 ft2 area?

Thanks,
Vamshi.

On Fri, Aug 30, 2013 at 4:31 PM, David Eldridge <DEldridge at grummanbutkus.com<mailto:DEldridge at grummanbutkus.com>> wrote:
Just to clarify - does the remaining 95,000 ft2 of regularly occupied office have an engineered natural ventilation scheme?

There are some cases where 90.1 asks for cooling systems to be modeled even if none are proposed. You'll need to find out if those conditions apply to you.

DSE Mobile

On Aug 30, 2013, at 4:06 AM, "vamshi ranga" <vamshiranga at gmail.com<mailto:vamshiranga at gmail.com>> wrote:

> Dear All,
>
> We are modeling Non residential building for USGBC New Construction rating, which has regularly occupied (office) area of 100000 sq ft, out of which only 5000 sq ft of the regularly occupied (office) area is conditioned with VRV systems.
>
> Could you please let us know how the conditioned area shall be considered in Baseline and Proposed case. my doubts is,
>
> Shall this be modeled with 5000 sq ft  conditioned area in both Base and Proposed or Is there any minimum requirement for percentage conditioned area?
>
> Thanks,
> Vamshi.
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