[Equest-users] VRF Modeling in Equest

[Gary.Schrader at tac.com]

It's ok Jeff... I'm in the office this late anyways, what's another 5
minutes?
 
Not all VRV/VRF systems simultaneously heat and cool, and regardless of
which one you end up with, both are very efficient.
 
Most of the simultaneous systems we have found to be not-so
cost-effective for our clients. That isn't to say we haven't utilized
them before, but, more often, we go with the non-simultaneous kind
because of the same superior efficiencies and lower first-cost.
 
With the systems that do not simultaneously heat and cool, very high
efficiencies are still obtained due to the fact that the compressor is
only using as much energy as the system needs to remove heat from one
place to the other. This compressor speed change occurs while the
evaporator and condenser remain the same size. In the old days, If you
wanted to increase the efficiency of a refrigeration system, you
increased the size of your condenser and evaporator. With VRV, you keep
the evaporator and condenser the same size, just shrink the load you put
on them. Therein lies the true genius of VRV: the varying capacity.
 
Your statement is true about utilizing the diversity of loads to
maximize efficiency, and if you have that load diversity, you will
probably find better payback and the extra expense of the system will
probably become much less of an issue. Most of my clients are K-12
schools, and there isn't a lot of core areas, at least in older
buildings. Considering that most of my building is heating in the winter
with little to no areas requiring cooling, simultaneous heating and
cooling doesn't do me very well, hence the reason why I haven't spent
time figuring out how to make it work.
 
As with all things HVAC: It depends on your application.
 
Good luck,
Gary Schrader 
Engineer I

TAC 
16011 College Blvd, Suite 212
Lenexa, KS  66219
Direct:	 +1 	
Fax:	 +1 913-469-0206	
Mobile:	 +1 913-217-8068	
Email:	 Gary.Schrader at tac.com	
Web:	 www.tac.com <http://www.tac.com/> 	


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________________________________

From: Jeff Ross-Bain [mailto:jross-bain at rbgreenbuilding.com] 
Sent: Tuesday, May 19, 2009 8:58 PM
To: Gary Schrader
Subject: RE: [Equest-users] VRF Modeling in Equest



Gary, 

 

Isn't the brilliance of the VRF system in that it has the capacity to
heat and cool simultaneously utilizing the diversity of loads?

 

Isn't that the efficiency of the system?

 

No need to respond but I do plan to review your posts. Thank you.

 

Jeffrey G Ross-Bain, PE, LEED

Ross-Bain Green Building, LLC

404-228-2893

 

P Build Green...Save Time

 

 

 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Gary.Schrader at tac.com
Sent: Tuesday, May 19, 2009 9:43 PM
To: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] VRF Modeling in Equest

 

Jeff, et al.,

 

I replied to Omer's post this morning. I'll repost it to the entire
group below:

 

Omer,

 

I have successfully modeled a VRV system (aka VRF) in eQuest, so long as
it is the variety that does not simultaneously heat and cool. I have
made several posts about it. Just search for my name with VRV in the
archives and you should be able to find it. Due to workload, I
unfortunately do not have the time to help you any further than that for
now.

 

Thanks,

Gary Schrader 
Engineer I

TAC 
16011 College Blvd, Suite 212
Lenexa, KS  66219

Direct:

+1 

Fax:

+1 913-469-0206

Mobile:

+1 913-217-8068

Email:

Gary.Schrader at tac.com

Web:

www.tac.com <http://www.tac.com/> 

 

Notice: This email message, together with any attachments, contains
information of TAC, which may be confidential, proprietary, copyrighted
and/or legally privileged. This email is intended solely for the use of
the individual or entity named on the message. If you are not the
intended recipient, and have received this message in error, please
immediately return by email and then delete it.

 

 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Jeff
Ross-Bain
Sent: Tuesday, May 19, 2009 8:41 PM
To: 'Omer Moltay'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] VRF Modeling in Equest

This is a great question Omer. Here, variable refrigerant flow (VRF)
systems are new and I understand they are ubiquitous in Asia and growing
in Europe (and it looks like you are between the two!). There is one
software company here, EnergyPro, which has capacity to model VRF
systems but also has a few shortcomings. It would be extraordinarily
beneficial if eQuest could perform this function. 

 

Does anyone have any comments or "how-to" advice and/or can this item be
placed on the eQuest wish list?

 

Regards,

 

Jeffrey G Ross-Bain, PE, LEED

Ross-Bain Green Building, LLC

404-228-2893

 

P Build Green...Save Time

 

 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Omer
Moltay
Sent: Tuesday, May 19, 2009 11:06 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] VRF Modelling in Equest

 

Dear All,

 

For a mixed-use building, we would like to see the savings through
installing a variable refrigerant flow system in eQuest. Anybody has any
experience with this? Does eQuest actually support VRF systems?

 

Best regards.

 

Omer Moltay, LEED AP
Mimta Architects

Hekimsuyu Cad. 559. Sk. No:39
34255 Kucukkuy Istanbul Turkey
Tel: 90-212-617-2296
Fax: 90-212-617-2297
www.mimtarch.com

 

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