[Bldg-sim] Tolerance for unmet load hours

[Michael Tillou]

Hi Celia,

 

ASHRAE 90.1 Appendix G would simply require that the tolerance be the same
in both the baseline and proposed design energy models. 

 

Cheers,

 

Mike 

 

 

Michael Tillou, PE, LEED AP BD+C, ASHRAE BEMP

Associate

 

Atelier Ten

Environmental Design Consultants + Lighting Designers

 

45 East 20th Street, 4th Floor

New York NY 10003

T +1 (212) 254 4500 x208

F +1 (212) 254 1259

michael.tillou at atelierten.com

 

www.atelierten.com

 

 

 

From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of
King-Scott, Celia
Sent: Wednesday, May 28, 2014 1:38 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Tolerance for unmet load hours

 

Does anyone know what the ASHRAE limitation on the tolerance (in F) for
unmet load hours is. Design Builder/EnergyPlus appears to have this
tolerance for the heating and cooling setpoint. It is defined as the maximum
difference from the heating setpoint when the reporting the time setpoints
are not met (for both heating and cooling). If the zone temperature is below
the heating/cooling setpoint by more than this value an unmet load hour will
be reported. 

There is a similar input in eQUEST called the 'Cool control range' and 'Heat
control range'. 

If you increase the value of this tolerance you will get smaller number of
unmet load hours. I was told once that ASHRAE has a limit on what this
tolerance is however I am unable to locate it.

Any help would be greatly appreciated. 

Thank you! 

 

 

Best regards

for KEMA Services Inc., USA


Celia King-Scott PE, BEMP, LEEDR AP BD+C 

Senior Engineer, Sustainable Buildings & Communities


E-mail  <mailto:celia.king-scott at dnvgl.com> celia.king-scott at dnvgl.com 
Mobile +16193097441 begin_of_the_skype_highlighting  |  Direct +16196880960
begin_of_the_skype_highlighting x 75120

 <http://www.dnvgl.com/> www.dnvgl.com  |
<http://www.linkedin.com/company/dnvgl> LinkedIn  

 

 

DNV KEMA is now DNV GL

 <http://www.dnvgl.com/> DNV GL

DNV and GL have merged to form DNV GL
We are now the world's largest ship and offshore classification society, the
leading technical advisor to the global oil and gas industry, and a leading
expert for the energy value chain including renewables and energy
efficiency. We've also taken a position as one of the top three
certification bodies in the world. Read more here:
<http://www.dnvgl.com/merger> www.dnvgl.com/merger.

 

This message may contain confidential or private information. If you are not
the addressee, please return the message to its sender and delete it from
your files. Please consider the environment before printing this email.

sender and delete it from your files. Please consider the environment before
printing this email.

 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20140528/f1e4593c/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 2815 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20140528/f1e4593c/attachment.gif>