[Equest-users] Equipment Sizing and % Hrs in Throttling Range

Mathew Higgins higgins at edi-arch.com
Sat Jan 17 14:59:24 PST 2009

All - I'm trying to resolve a gshp school system model, to reduce the 
number of hours outside of throttling range for LEED purposes. I have 
scowered multiple threads talking about sizing, throttling range, min 
air flow ratios, reverse-action TSTATs, night-setback, gshp's, etc. and 
have applied suggestions with minimal result. The only way I can take 
considerable hours out of the % not in throttling range is if I increase 
sizing ratios way beyond design capacities and strip out everything that 
makes the model accurately reflect design conditions.

I've attached the before and after (.pd2) files for reference, however 
results are still not seen. SS-R reports indicate hours in the 100+ load 
range, but again this is going beyond manually specifying capacities and 
using sizing ratios. Also to be noted, the ASHRAE baseline (Pkg Elec HP) 
is also in the same range and is not responding to changes... which 
would suggest something common to both within Appendix G criteria.

Experience and opinions would be greatly appreciated.

Matthew Higgins, LEED AP + ASHRAE-HBDP
Technical Specialist
Environmental Dynamics, Inc.
Architecture and Sustainability Consulting Services

Any data provided by the Consultant, verbal or written, are to be considered opinions of building energy and/or daylight performance. The Client understands that the Consultant has no control of occupant habits, equipment or material performance or characteristics, site or climate conditions or the Contractor's method of assembly, and that the Consultant's opinions regarding building energy/daylight performance are made on the basis of the Consultant's professional judgment and experience. The Consultant makes no warranty, express or implied, that the energy/daylight performance of the building will not vary from the Consultant's opinion of building energy/daylight performance.

-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: before.pd2
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20090117/7f3c246d/attachment.txt>
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: after.pd2
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20090117/7f3c246d/attachment.asc>

More information about the Equest-users mailing list