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

[Gary.Schrader at buildings.schneider-electric.com]

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 | 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)

Nahas Building, 4th floor

4 St-Maron Street / Georges Haddad Avenue

Postal Code: 2028 5806 SAIFI

Beirut, Lebanon

Tel:          +961 (0) 1 971 266
Mobile:    +961 (0) 3 045 045

 

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 <http://www.ecoconsulting.net/> 

 

  

 


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