commissioning green buildings - bcxa€¦ · 18th national conference on building commissioning a...
TRANSCRIPT
Paul McCownSr. Energy EngineerSSRCx, LLC
Commissioning Green Buildings
A PECI EVENT18th National Conference on Building Commissioning
Learning Objectives
1. LEED for Existing Buildings; Retro-commissioning process 2. Energy management best practices for existing buildings3. Examples of energy efficiency in existing buildings
AIA Quality Assurance
A PECI EVENT18th National Conference on Building Commissioning
The Metrics
•LEED: Existing Buildings GOLD•320,000 ft2
Class A Office•12% -
immediate reduction in energy•28% -
highest monthly reduction in energy•Savings of $207,000 to date from energy•Reduced water consumption by 22%•Reduced solid waste generation by 49%
A PECI EVENT18th National Conference on Building Commissioning
Outline
Building DescriptionLEED-EB v2.0 Retro-Cx guidelines
•
Project Timeline•
Performance Period•
Retro-Cx Scope
Retro-Cx Process•
Findings•
Results
Continuous Commissioning®
Process•
Findings•
Results
A PECI EVENT18th National Conference on Building Commissioning
Building Description
Class A Office•
11 stories, 320,000 sf, 900 people, 1600 computers
•
Cafeteria, fitness center, parking garage, auditorium
HVAC•
2, 500 ton chillers with constant volume pumping
•
2 cooling towers •
13 VAV air handling units, fan powered boxes (perimeter)
•
Fully electric facility
A PECI EVENT18th National Conference on Building Commissioning
Retro-Cx Implementation
Two options•
Visual observation
•
Data trends
Scope•
Develop a building operations plan (BOP)
•
Prepare a commissioning plan•
Implement the commissioning plan
•
Make repairs or upgrades of deficient items•
Retest items repaired (over 5 years)
A PECI EVENT18th National Conference on Building Commissioning
Timeline
January 2008•
Preparation for RCx•
Assessment•
Maintenance
May 2008•
Performance Period Begins•
Retro-Cx begins
August 2008•
LEED-EB submission
February 2009•
LEED-EB Gold Certification
A PECI EVENT18th National Conference on Building Commissioning
RCx FindingsChilled water
•
Chilled water bypass valve operation
A PECI EVENT18th National Conference on Building Commissioning
RCx Findings
Chilled water•
Chilled water supply temperature reset based on outside air temperature○
42ºF to 50ºF based on CHW valve position located at the AHUs
Air-Side•
Test and Balance of Fan Powered Terminal Boxes
•
After-hours temperature setback○
Winter operation did not work at first
•
Supply air static pressure reset•
Supply air temperature reset
A PECI EVENT18th National Conference on Building Commissioning
RCx Findings
Building Envelope
Chimney effect at roof column Missing insulation under first floor at parking garage.
A PECI EVENT18th National Conference on Building Commissioning
RCx ResultsEnergy Savings
A PECI EVENT18th National Conference on Building Commissioning
CC® Findings
Building Supply and Exhaust Air•
Exhaust “conditions”
Telecomm and Electrical rooms
•
Automatic F/S Dampers shutting down•
Modified Supply and Exhaust Fan schedules (7pm-7am off)
Air Terminal Boxes•
Were not coming on in winter after hours operation
•
Needed “main air”
from AHU•
Reprogrammed boxes to provide heat with box fan only
•
Savings can be seen immediately in March 2009 energy bill
A PECI EVENT18th National Conference on Building Commissioning
CC® FindingsAfter-Hours Operation
•
Re-Zoning○
Several spaces require air conditioning 24/7○
Reprogrammed the terminal boxes for these areas to remain in occupied mode, while others on the AHU went to unoccupied mode.
○
AHU stayed on, VFD ramped to minimum○
Duct was not over-pressurized due to fan type (backward-inclined airfoil), VFD minimum, and duct configuration
•
Request for occupied time○
Prior to changes, many floors were scheduled to be occupied on Saturday (even for only a few people).
○
Zones were mapped.○
Thermostats were re-programmed to allow for over-ride○
Now, when only one person comes in after hours, their zone can be over-ridden without over-riding the whole floor.
A PECI EVENT18th National Conference on Building Commissioning
CC® ResultsEnergy Savings
A PECI EVENT18th National Conference on Building Commissioning
Results
Energy Star Score•
62 as of January 2008
•
76 as of March 2010•
23% increase
Energy Use Index (kBtu/sf/yr)•
107.5 as of January 2008
•
85.2 as of March 2010•
21% decrease
A PECI EVENT18th National Conference on Building Commissioning
Results
•LEED: Existing Buildings GOLD•320,000 ft2
•12% -
immediate reduction in energy•28% -
highest monthly reduction in energy•Savings of $207,000 to date from energy•Energy Star Registered March 2010•Reduced water consumption by 22%•Reduced solid waste generation by 49%
A PECI EVENT18th National Conference on Building Commissioning
AIA Quality Assurance
Portland Energy Conservation, Inc is a registered provider with The American Institute of Architects Continuing Education Systems. Credit earned on completion of this program will be reported to CES Records for AIA members. Certificates of Completion for non-AIA members are available on request.
This program is registered with the AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product. Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
