[Equest-users] Water Loop HP system type fan power

James Hess JHess at tmecorp.com
Fri Mar 1 13:36:40 PST 2013


Absolutely agree!  :)

Regards,

JAH

James A. Hess, PE, CEM, BEMP
Energy Engineer
TME, Inc.
Little Rock, AR
Mobile: (501) 351-4667

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Stormy L. Shanks
Sent: Friday, March 01, 2013 3:10 PM
To: Howe, Timothy; Bishop, Bill; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Water Loop HP system type fan power

For another reference point, the heat pump eQUEST library published by ClimateMaster for their equipment has kw/CFM values ranging between 0.000061 and 0.00062 with an average of 0.00028 kW/CFM among the models in that library. There can be an order of magnitude difference depending on the model of heat pump you use. So, the eQUEST default is at the very low end for ClimateMaster models at least, which does seem too low.

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Stormy L. Shanks, PE
Mechanical Engineer

2882 106th St, Des Moines, IA 50322

web<http://www.kjww.com/> | Facebook<http://www.facebook.com/kjwwengineering> | Twitter<http://twitter.com/kjww> | LinkedIn<http://www.linkedin.com/company/kjww-engineering-consultants>



From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Howe, Timothy
Sent: Friday, March 01, 2013 2:16 PM
To: Bishop, Bill; equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: Re: [Equest-users] Water Loop HP system type fan power

I typically see around 0.000400 on HP system.  Give or take a little bit depending on how you do your calc and what kind of electrical efficiency you assess to a fractional hp motor.

3 ton McQuay unit:

[cid:image002.png at 01CE1692.90B35070]


Timothy Howe, MS, BEMP, LEED® AP BD+C
Mechanical Engineer
Stantec
61 Commercial Street
Rochester NY 14614
Ph:   (585) 413-5347
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Cell: (585) 281-3223
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From: equest-users-bounces at lists.onebuilding.org<mailto:equest-users-bounces at lists.onebuilding.org> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Bishop, Bill
Sent: Friday, March 01, 2013 3:06 PM
To: equest-users at lists.onebuilding.org<mailto:equest-users at lists.onebuilding.org>
Subject: [Equest-users] Water Loop HP system type fan power

The eQUEST default is .000070 kW/cfm for the HP system type. This is the same as the default for Unit Heaters, and seems really low. It is only 1/4th the Appendix G. baseline PTAC/PTHP fan power, which has been criticized as too low in another [neverending] thread.
Could there be an extra zero in there? (No, not the one on the end.)

Thanks,
Bill

[Senior Energy Engineer 28Jun2012]<mailto:wbishop at pathfinder-ea.com>


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