[Equest-users] VRV Special case: is it worth modeling?

[Carol Gardner]

For the most part, I agree with Eddie. It is pretty easy to model a VRV
system in eQUEST but you do need to input curve data related to your
equipment if you want to accurately model them.

Carol

On Thu, Oct 14, 2010 at 8:27 AM, Eddie Corwin
<ecorwin at altanova-energy.com>wrote:

> For the most part, I agree with Gary.  I believe that you will also find
> significant savings from part-load performance from the VRV system.  VRV
> systems operate more efficiency at part-load, especially when compares to a
> chiller.  I just finished modeling a VRV system, and with the newest version
> of eQuest, it is not that difficult.  Simply use the PVVT system, and set
> the compressor to variable speed.  You will need a low-speed curve for both
> heating and cooling.  I took those curves from the ResidentialPVVT system.
>
> I also agree that a COP of 10 seems unreasonable, but I assumed that you
> meant an EER of 10
>
> -Eddie
>
>
> ------------------------------
> *From:* "Gary.Schrader at buildings.schneider-electric.com" <
> Gary.Schrader at buildings.schneider-electric.com>
> *To:* omar at ecoconsulting.net; equest-users at lists.onebuilding.org
> *Sent:* Thu, October 14, 2010 11:10:43 AM
> *Subject:* Re: [Equest-users] VRV Special case: is it worth modeling?
>
>  Omar,
>
>
>
> The only thing that would save you a significant amount of energy in my
> opinion would have been scheduling large VAV air handling and plant
> equipment that was originally serving them. I had a project where I took
> data closets off of the VAV units and put VRV units in the closets so that
> the VAV units no longer had to run 24/7. Scheduling these large VAV units
> had a significant savings impact.
>
>
>
> In your case, it sounds like you may have something similar but I would
> need clarification. You said that your closets (that you want to convert to
> VRV) are currently FCU. I assume that these FCUs are served by chilled
> water. By switching these closets over to VRV, are you able to now schedule
> the chiller off? If yes, I would assume that significant savings would
> result by not running a chiller (and pumping) 24/7, even with a high
> unloading capability and variable-speed pumping. (If you had low unloading
> capability and constant pumping, more savings would result)
>
>
>
> At face value, simply changing the efficiency of the cooling equipment
> isn’t enough to evaluate energy savings. If, however, you can significantly
> change the schedule of plant equipment because it is isolated from zones
> that require 24/7 operation, savings could be significant and I would
> certainly recommend a model.
>
>
>
> Sidenote: 10 COP seems very, very high for even the best VRV equipment. I
> would check that value to ensure accuracy…
>
>
>
> Best luck,
>
> Gary
>
>
>
> _______________________________________________________________________________________________________________________
>
> *Gary Schrader* | *Schneider Electric *| *Buildings Business* | *Energy
> Solutions *| *Engineer I*
> *Phone:* +1 913 217 8068 | *Fax: *+1 913 469 0206
> *Email: *gary.schrader at buildings.schneider-electric.com<Mailto:gary.schrader at buildings.schneider-electric.com>|
> *Site: *www.schneider-electric.com/buildings | *Address: * 16011 College
> Boulevard, Suite 212 , Lenexa , KS 66219 , USA
>
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>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *Omar Katanani
> *Sent:* Thursday, October 14, 2010 5:41 AM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] VRV Special case: is it worth modeling?
>
>
>
>
>
> Dear all,
>
>
>
> My school has some 200 zones including classrooms, storage rooms,
> offices...
>
>
>
> The HVAC system is a VAV one, with FCU for 17 offices/storage rooms.
>
>
>
> In the new updated design, 4 of these FCUs were replaced with a VRV system.
> I am about to model that:
>
>
>
> Do you think that these 4 small zones (electrical room (x 2), UPS room,
> telephone room) will significantly change the Space Cooling results (not
> that no heating is required)? I mean, these zones had FCUs and were
> conditioned. All that changed is that a VRV (COP=10) replaced the chiller
> (COP=5.4) for only 4 zones!
>
>
>
> I would like to avoid the complexity of modeling VRVs if possible!
>
>
>
> Many thanks,
>
> Omar
>
> ___________________________
>
> Omar Katanani
> Sustainable Design Engineer
>
> Email: omar at ecoconsulting.net
>
>
>
> EcoConsulting ( Lebanon )
>
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>
> 4 St-Maron Street / Georges Haddad Avenue
>
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>
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>
> Tel:          +961 (0) 1 971 266
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>
>
>
> EcoConsulting ( UK ) Ltd
> 28 Marshalsea Road
> London , SE1 1HF
> Tel:  +44 (0) 207 939 0989
> Fax:  +44 (0) 207 939 0981
>
> Website: www.ecoconsulting.net
>
>
>
>
>
>
>
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-- 
Carol Gardner PE
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