[Equest-users] VRF in eQuest

Fri May 14 06:47:15 PDT 2010

For curve fit info, I have always used the manufacturer's performance data sheets and picked several points off of the charts and then generated a curve using that information. I'm not sure how "typical" the curves are between one manufacturer and another, or between one model and another for that matter.

I have not seen any curves anywhere on the internet for VRF/VRV equipment. I've generated them myself every time. That said, this is what I have come up with on my past projects:

Cooling EIR=f(EWB,ODB)=
a=-3.86460948
b=.13359652
c=-.00097171
d=-.02367110
e=.00010817
f=.00022779

Cooling CAP=f(EWB,ODB)=
a=-5.1623230
b=.14462045
c=-.00076546
d=.01399993
e=-.00000870
f=-.00021874

Heating EIR=f(EDB,OAT)=
a=-.06203419
b=.02622044
c=-.00012317
d=.04781748
e=-.00021321
f=-.00057526

Heating CAP=f(EDB,OAT)=
a=.76658428
b=.00072927
c=-.00001362
d=.03394593
e=-.00012465
f=-.00031964

These curves were for a Daikin VRV-III system that was NON-heat-recovery and between 10-14 tons in capacity.

I would not recommend using these curves on Mitsubishi, Sanyo, etc., just by virtue of the fact that they all do it a little bit differently. My assumption is that they are at least similar.

I won't pretend like I know how to model the energy-recovery versions of any of these products.

Hopefully this helps you guys get on the right track. I felt terrible reading the VRV posts coming across the listserv all week and saying nothing about them, so here is my contribution, albeit limited.

Happy Friday,
Gary

_______________________________________________________________________________________________________________________

Gary Schrader | Schneider Electric | Buildings Business | Energy Solutions | Engineer I
Phone: +1 | Mobile: +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 Carol Gardner
Sent: Thursday, May 13, 2010 6:29 PM
To: Pasha Korber-Gonzalez
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] VRF in eQuest

Hi all,

It's my pleasure to share information. I might be able to get some curve fit info, too, but you will need to absolutely know what you are doing to implement it. It is for when you are calling VRF/VRVs air source heat pumps. NOT FOR WATER SOURCE. I will forward when I get it. You will use it only if you are able to do so with skill! 

Peace out,
Carol

On Thu, May 13, 2010 at 11:47 AM, Pasha Korber-Gonzalez <pasha.pkconsulting at gmail.com> wrote:

	Carol, this is awesome--thanks for your assistance as always and I'll check back with you and all to let you know how it worked out for my project.

	thanks again,
	Pasha  :)

	On Thu, May 13, 2010 at 10:01 AM, Carol Gardner <cmg750 at gmail.com> wrote:

		Pasha,

		Here is the info you needed for your VRV project. I'll send it via this email as others may need similar data:

		I have included some input data below for the units you requested.  I have given you the data in EIR form as that is what gets put into Equest and I figured it would save a step. 

		Here is the data I would enter for the systems:

		Outside Units

		PURY-P234TGMU-A

		Cooling EIR: .315 Heating EIR: .294

		PURY-P72TGMU-A

		Cooling EIR: .307 Heating EIR: .271

		PURY-P144TGMU-A

		Cooling EIR: .336 Heating EIR: .291

		PURY-P108TGMU-A

		Cooling EIR: .307 Heating EIR: .282

		Inside Units

		PKFY-08 - .14watts/cfm

		PKY-12 - .08watts/cfm

		PKY-15 - .08watts/cfm

		PKY-024 - .06 watts/cfm

		PKY-30 - .07 watts/cfm

		Let me know if this works for you or if you need additional info,

		Cheers,

		Carol

		On Mon, May 10, 2010 at 11:44 AM, Pasha Korber-Gonzalez <pasha.pkconsulting at gmail.com> wrote:

			Can't be done explicitly in eQuest.   I searched the www.onebuilding.org <http://www.onebuilding.org/>  archives for VRV and VRF to see what past discussions and advice has been put out there.  At this point this is the best suggestion I can give.  I'm trying to model one now for a LEED project--not a smooth process.  

			pasha

			On Mon, May 10, 2010 at 10:21 AM, Lopez, Phylroy <Phylroy.Lopez at stantec.com> wrote:

				Has anybody done a VRF system in eQuest? Or know of any resources that would detail how to do this? 

				I want to make sure I am not rebuilding the wheel here. 

				Phylroy Lopez B.Eng LEED A.P.
				Sustainable Building Specialist
				Stantec

				1100 - 111 Dunsmuir Street
				Vancouver BC V6B 6A3
				Ph: (604) 696-8337
				Fx: (604) 696-8100

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

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				From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Rob Hudson
				Sent: Thursday, May 06, 2010 1:16 PM 

				To: equest-users at lists.onebuilding.org

				Subject: [Equest-users] Reheat/preheat/heating help

				I have a constant volume VAV system with a preheat coil, no heating coil, and reheat box at the terminal.  The preheat is steam and the reheat is hot water.  I am looking for verification on the way i set this up in the model.  I set the heating capacity to 0 on the system level and entered in a preheat coil under the preheat/baseboard tab.  Also under the preheat tab, i entered my capacity and leaving air temp (50deg).  On the coil cap/control tab i have entered my zone entering max supply temp = 87 deg, thats the temp i want the reheats to go up to.  Then under each separate VAV zone, i entered the reheat capacity under the Maximum Heating Rate.  

				Let me know if i confused anyone or need to send pictures or files.

				-- 
				Rob Hudson

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		-- 
		Carol Gardner PE

-- 
Carol Gardner PE

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