[Equest-users] Water Source Heat Pump Efficiencies

[Demba Ndiaye]

Daniel,

Water-source heat pumps of size greater than 135 kBtu/hr are not regulated by 90.1.

Meaning there is no minimum efficiency required for such equipment.

______________
Demba NDIAYE

From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kelsey VanTassel
Sent: Friday, October 01, 2010 10:07 AM
To: Daniel Deese; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Water Source Heat Pump Efficiencies

No, you are right, there is nothing listed in the tables for water-source heat pump greater than 135,000 Btu/h. I think that's when you go to the water-chilling packages table and start looking at the minimum efficiencies for water-cooled chillers. That wouldn't cover the heating mode, though. Maybe someone else knows for sure.

Kelsey Van Tassel
Mechanical Engineer | kvantassel at sustaineng.com<mailto:kvantassel at sustaineng.com>
608.836.4488 ext. 20 | Fax: 608.836.4477

Sustainable Engineering Group
901 Deming Way, Suite 201
Madison, WI 53717
www.sustaineng.com<http://www.sustaineng.com/>


From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Daniel Deese
Sent: Friday, October 01, 2010 8:52 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Water Source Heat Pump Efficiencies

Hi all,

            I know they always say there's no such thing as a stupid question, but I've been looking through ASHRAE 90.1  table 6.8.1 as well as I know how, and I cannot find the required efficiency rating for a water source heat pump with a capacity greater than 135,000 BTU/hr.  We're trying to model Multistack heat pump/chillers, and we're using the 70-ton model, which correlates to about 840,000 BTU/hr.

            Has anyone ever modeled a water source heat pump larger than 135 MBH, and if so, which efficiency did you use?  I know I'm absolutely horrible at where's waldo, so there's a good chance I've just overlooked it.  Any help or advice is as always appreciated.  Thanks.

daniel

Daniel I. Deese, EI| CRB Consulting Engineers |
1255 Crescent Green, Suite 350 | Cary, NC 27518 |
P: 919-852-5443 | F: 919-852-5454 | X: 4543
Email: daniel.deese at crbusa.com<mailto:daniel.deese at crbusa.com>
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