[Equest-users] Minimum Efficiency System 5

[Cam Fitzgerald]

Pasha:

 

The description for system 5 in Table G3.1.1B describes the system type as "packaged rooftop variable air volume with reheat" which is the type of equipment covered in Table 6.8.1A Electronically Operated Unitary Air Conditioners and Condensing Units.  The "single package" sub-category can be found in the fourth column from the left in this table which also contains information for split systems.  Table 6.8.1D covers very small capacity terminal air conditioners which are defined in Section 3.2 as "a factory selected wall sleeve and separate uncased combination of heating and cooling components, assemblies, or sections.  It may include heating capability by hot water, steam, or electricity and is intended for mounting through the wall to serve a single room or zone."

 

More information can be found about these system types in the ASHRAE Systems & Equipment Handbook.

 

Cam Fitzgerald

 

From: Pasha Korber-Gonzalez [mailto:pasha.pkconsulting at gmail.com] 
Sent: Tuesday, May 04, 2010 1:58 PM
To: Cam Fitzgerald
Cc: Ömer Moltay; equest-users at lists.onebuilding.org
Subject: Re: Re: [Equest-users] Minimum Efficiency System 5

 

Cam,

 

I'm curious to where you found the reference for a "single package" sub-category and how it is pointing to table A to be used for performance factors of packaged equipment as opposed to table D which is specific to packaged a/c units.   

 

I looked back through 90.1 and can't find any notes or guidance to follow your recommendation to point me to table 6.8.1A.  Can you please provide more specific reference to where you are getting this info from Appendix G?   This could be a significant thing for the rest of us to learn and for me to correct if I have missed the info you are refering to.

 

Thanks for your help on this.

 

pasha

On Tue, May 4, 2010 at 6:30 AM, Cam Fitzgerald <cam at energyopportunities.com> wrote:

Omer:

 

For system type 5 you should be using sub-category "single package" with the appropriate heating section type from Table 6.8.1A.  Table 6.8.1D applies to system types 1 and 2, small packaged terminal units.

 

Hope this helps.  Have a great day!

 

Cam S. Fitzgerald, PE, LEED AP

 

Energy Opportunities, LLC

a 7group company

e-mail:  fitzgerald at sevengroup.com

 

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Pasha Korber-Gonzalez
Sent: Tuesday, May 04, 2010 5:30 AM
To: Ömer Moltay
Cc: equest-users at lists.onebuilding.org 


Subject: Re: [Equest-users] Minimum Efficiency System 5

 

Omer,

 

I would use 6.8.1D.  Just because you are looking at a COP value doesn't mean that it wasn't originally an EER or SEER value, you might want to back out the EER value from your equivalent COP and see if you can reference it from the 6.8.1D table for Packaged equipment performance.

 

pasha

2010/5/4 Ömer Moltay <omoltay at mimtarch.com>

Dear All,

 

 

What would you choose as the minimum efficiency for baseline modelling for the DX cooling (923 kW) of System Type 5 from Appendix G (Packaged rooftop VAV with reheat)? I am looking at a model previously done by someone else and the COP has been chose as 2.96, which could mean that they have used Table 6.8.1A - Condensing units, air cooled. But I am not sure if this should be correct.

 

Thanks,

 

Ömer Moltay, LEED AP
Mimta Ltd.
Hekimsuyu Cad. 559. Sk. No:39
34255 Kucukkoy Istanbul Turkey
Tel: 90-212-617-2296
Fax: 90-212-617-2297
www.mimtarch.com <http://www.mimtarch.com/> 

 

Sürdürülebilir Binalar Blog
http://surdurulebilirbina.blogspot.com <http://surdurulebilirbina.blogspot.com/> 

 

Green Building in Turkey on LinkedIn
http://www.linkedin.com/groups?gid=2278249

	----- Original Message ----- 

	From: Piyush Varma <mailto:varpiyush at gmail.com>  

	To: equest-users at lists.onebuilding.org 

	Sent: Tuesday, May 04, 2010 11:55 AM

	Subject: [Equest-users] Queries

	 

	Hi all, 

	 

	I am an eQuest newbie and had 2 small queries which hopefully would be answered.

	 

	01. What's the logic behind eQuest giving positive (+ve) Cooling Loads & (-ve) negative Heating Loads. (I made an Admittance Method Algorithm & it gives me the opposite values, eQuest i.e. negative cooling loads & +ve heating loads, have checked all sign convention...can't figure out why? My algorithm simulates for Delhi's (India) climate predominantly, cooling loads.

	 

	02. I have asked this before...is there any library for data of alternating solar gain factors, especially for Delhi, India. (As far as i believe it does'nt take into account the alternating solar gain factor...) 

	 

	hope these get resolved soon, thanks in advance.

	 

	Regards,

	Piyush

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