[Bldg-sim] VRV System Equipment Efficiency

[Gavin Gui]

I agree with Larry. There is no exact system specified in the ASHRAE 90.1 that
matches the VRV system. We used to model the VRV system using the efficiencies
in Table 6.8.1B, however note that these efficiencies are typically for full
load operations, hence it will not capture the advantage of the part load
capability of the VRV systems. I.e. to say, the savings calculated as such
will be typically conservative.

 

Also note that VRV systems are generally waived from the DOE test procedure
applicable to commercial package air-cooled central air conditioners and heat
pumps (2 systems that I know of are the Mitsubishi City-Multi and Sanyo
VRV-III systems) although they have to comply with the alternate testing
procedure. So just take note of the system efficiencies used for the modeling.

 

-------------------------------------------------

Gavin Gui

Project Engineer

ERS, Inc.

120 Water Street, Ste. 350

North Andover, MA 01845

Ph: 978-521-2550, x 236

Fax: 978-521-4588

ggui at ers-inc.com <mailto:jrogers at ers-inc.com>  

www.ers-inc.com <http://www.ers-inc.com/>  

-------------------------------------------------

 

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Larry Degelman
Sent: Monday, March 15, 2010 9:24 AM
To: Shubhra Kothari; reniel barroso
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] VRV System Equipment Efficiency

 

Here's another opinion (non-authoritative): I believe the VRV efficiency
requirements would match best with the "air cooled, cooling and heating modes"
requirements in Table 6.8.1B (for heat pumps).  In the ECB method, this would
most likely be system 8, Packaged terminal heat pumps.  I agree that the
ventilation should be modeled separately as a DOAS.

 

LOD

===========================
Larry O. Degelman, P.E.
Professor Emeritus of Architecture
Texas A&M University
===========================

 

From: Shubhra Kothari <mailto:shubhrakothari at gmail.com>  

Sent: Monday, March 15, 2010 12:32 AM

To: reniel barroso <mailto:renielbarroso at yahoo.com>  

Cc: bldg-sim at lists.onebuilding.org 

Subject: Re: [Bldg-sim] VRV System Equipment Efficiency

 

Well, there seems to be no ARI standard for testing VRV yet. So, you won't
find it in 90.1.  

The closest you can get is packaged single zone (match cooling capacity) i
believe but you'll have to figure out a way of modelling the fresh air side-
as DOAS or others. 

Thanks
Shubhra Kothari

On Mon, Mar 15, 2010 at 12:26 AM, reniel barroso <renielbarroso at yahoo.com>
wrote:

Hi to all!

 

Where can we find the Minimum Requirement System Efficiency of a VRV System in
ASHRAE 90.1?

Which of those systems mentioned in the ASHRAE 90.1 can we use to compare such
equipment?

 

 

Thanks

 

 

Reniel

 

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