Big Dreams Tight Budgets: UH retro-commissioning to reduce Carbon footprint Presented at Gulf Coast Green - 2010 April 15, 2010 University of Houston Houston, TX
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Big Dreams Tight Budgets: UH retro-commissioning to reduce Carbon footprint
Presented at
Gulf Coast Green - 2010April 15, 2010University of HoustonHouston, TX
Big Dreams Tight Budgets: Big Dreams Tight Budgets: UH retro-commissioning to reduce Carbon UH retro-commissioning to reduce Carbon footprintfootprint
Agenda
Retro-commissioning Implementation, Cost, Operational Savings
Retro-commissioning and Improved Occupant Comfort
Project Planning and Coordination
Measurement and Verification
33
Commissioning (CX)Commissioning (CX)
44
CX and RCXCX and RCX
Commercial buildings >25,000 sq ft pay $50 billion/yr for energy Cx energy savings range: 6% - 9%
– California Market Characterization Study (2000) RCx energy savings range: 7% - 30%
– LBNL study: The Cost-Effectiveness of Commissioning New and Existing Commercial Buildings: Lessons from 224 Buildings (2005)
Most projects see a 5 - 25% reduction in utility cost as the result of low-cost RCx efforts
– Retrocommissioning’s Greatest Hits; www.peci.org
55
Retro-Commissioning (RCX)Retro-Commissioning (RCX)
Systematic investigation process for improving or optimizing a building’s operation and maintenance
Reducing energy waste, obtaining energy cost savings, and identifying and fixing existing problems
66
Retro-Commissioning (RCX)Retro-Commissioning (RCX)
Primary objectives for retro-commissioning a project: Bring equipment to its proper operational state Reduce complaints Reduce energy and demand costs Increase equipment life Improve indoor air quality Increase tenant satisfaction Improve facility operation and maintenance Reduce staff time spent on emergency calls
77
UH RCX ProjectsUH RCX Projects
Program Manager - CenterPoint Energy
Program Administrator – Nexant
Engineer/Technical Audit – ACR Engineering
Installing Contractor – Controls Unlimited
Host/Owner – University of Houston
Buildings Implemented on CampusBuildings Implemented on Campus
99
UH RCX Project - 2009UH RCX Project - 2009
Buildings Selected
1. Isabel Cameron
2. Technology-1
3. Engineering
4. Communications
5. Wortham Theater
1010
UH RCX Project - 2009UH RCX Project - 2009 Change Preheat Setpoint for Cameron OAHU 1
Communications OAHU Schedule
Wortham OAHU Schedule
Communications Exterior Lights
1111
UH RCX Project - 2009UH RCX Project - 2009 Engineering Lighting
Add ceiling fans to Wortham theater
Reduce Engineering OA
1212
UH RCX Project - 2009UH RCX Project - 2009 DCV for Cameron
Reset VFDs to automatic
Technology DDC
Cameron DDC
1313
UH RCX Project - 2009UH RCX Project - 2009Annual Total Energy Cost
Savings
Implementation Cost
Simple Payback
Avg. Peak Period kW
Demand
Peak Period kWh
Annual kWhAnnual
MCF$ $ Years
1Change Preheat Setpoint for
Cameron OAHU 12.0 1,028 55,518 928 $16,057 $0 0.00
2Communications OAHU
Schedule11.7 6,038 35,436 98 $3,827 $0 0.00
3 Wortham OAHU Schedule 41.7 21,526 112,158 291 $11,855 $0 0.00
4Communications Exterior
Lights4.6 2,348 14,947 0 $1,076 $0 0.00
5Remove Excess EDFs in
Engineering0.0 0 0 0 $0 $0
6 Engineering Lighting 0.0 0 3,679 0 $265 $1,000 3.77
7 Add Fans to Wortham 4.8 2,460 48,792 0 $3,513 $0 0.00
8Reduce Engineering Outdoor
Air59.8 30,832 404,796 273 $32,689 $1,750 0.05
9Demand Controlled Ventilation
for Cameron3.7 1,914 9,806 20 $971 $4,000 4.12
10 Reset VFD's to Auto 47.3 24,423 853,342 0 $61,441 $0 0.00
11 Technology DDC 0.0 0 140,797 0 $10,137 $12,500 1.23
12 Cameron DDC 8.1 4,187 318,945 126 $24,606 $15,000 0.61
184 94,756 1,998,217 1,736 $166,436 $34,250 0.21
Measure No.
Retro Commissioning Measure Description
TOTALS
Utility Savings
1414
Retro-Commissioning (RCX)Retro-Commissioning (RCX) Participated in CenterPoint’s Standard Offer Program (CISOP)
and Pilot RCX program (with 3 buildings) Total Gross area = 285,000 sf
Established in-house RCX program (Total gross area audited = 990,000 sf)
Reinvested $575,000 energy grant received through CI SOP to implement measures identified in RCX programs
Participated in CenterPoint RCX program with 8 more buildings Total gross area = 810,000 sf
Future participation with auxiliary buildings
Energy Efficiency & Sustainability Energy Efficiency & Sustainability MilestonesMilestones
15
1616
Sustainability Sustainability TaskTask Force Force FY 2009
Continue Energy conservation/retro-commissioning efforts
University’s Carbon Footprint calculation
Scored 84/99 points in Princeton Review Sustainability study and grade B in 2010 College sustainability report card
Project Coordination PlanningProject Coordination Planning
Project Scope Project Components Pre-Implementation planning Implementation Commissioning Process Evaluation Period / Trending
Building Operation Observations Power Adjustments
Project Coordination PlanningProject Coordination Planning
Pre-Implementation planning Building usage and scheduling Long Term Considerations
Controls Network Plan Network Structure Device ID Number Scheme
Measurement and VerificationMeasurement and Verification Commissioning Process
Process Development Commissioning
Every Point System Value Field Value
Program Operation PID Loop Tuning Program Evaluation
Repair Redevelopment Seasonal Change Evaluation
Program Adjustment Occupant Comfort – Hot/Cold Calls PID Loop Tuning
Measurement and VerificationMeasurement and Verification Evaluation Period / Trending
Temperatures Plant Chilled Water Power
Utility Metering Building Operation Observations
Data Samples and Adjustments
Evaluation Period / TemperatureEvaluation Period / Temperature
Measurement and VerificationMeasurement and Verification Evaluation Period / Trending
Temperatures Plant Chilled Water Power
Utility Metering Building Operation Observations
Data Samples and Adjustments
Evaluation Period / Chilled WaterEvaluation Period / Chilled Water
Measurement and VerificationMeasurement and Verification Evaluation Period / Trending
Temperatures Plant Chilled Water Power
Utility Metering Building Operation Observations
Data Samples and Adjustments
Evaluation Period / ElectricalEvaluation Period / Electrical
Evaluation Period / Trending Evaluation Period / Trending ReviewReview
COLLEGE OF ARCHITECTURE INSTANT ELECTRICAL USAGE
0
50
100
150
200
250
300
350
System Settings to Occupied Mode
Exterior Lighting ON Approx. 6:00PMSystem Settings to Unoccupied Mode
Exterior Lighting OFF Approx. 7:30AM
Cooling / Lighting Loads Increase During the Day and Decrease During the Night
Trended Energy Data SampleTrended Energy Data Sample
Hilton Hotel at The University of Houston Change Dual Ducts to VAV
Retrofit Controls Install VFD’s Install Dampers in Hot Ducts
Retrofit Hotel Air Handlers Serving Public Spaces Demand Ventilation
Install VFD’s on Hotel Air Handlers Retrofit 53 Dual Duct Mixing Boxes for
Assembly Areas Temperature Sensors CO2 Occupancy
The Impact – Auxiliary Campus The Impact – Auxiliary Campus Buildings Find AdvantagesBuildings Find Advantages
Big Dreams Tight Budgets: UH retro-commissioning to reduce Carbon footprint
Sameer A. Kapileshwari, PE, LEED APUniversity of HoustonUniversity of HoustonDirector of Utilities, Energy, and Technical ServicesDirector of Utilities, Energy, and Technical Services4211 Elgin4211 ElginHouston, TX 77204Houston, TX 77204
Phone: (713) 743-5797Phone: (713) 743-5797Email: Email: [email protected]: Web: http://www.uh.edu/plantops
Cole Robison, MBA, LEED APControls Unlimited, LLCControls Unlimited, LLCDirector of OperationsDirector of Operations26014 Aldine Westfield, Suite 101C26014 Aldine Westfield, Suite 101CHouston, Texas 77373Houston, Texas 77373
Phone: (713) 554-0560Phone: (713) 554-0560Email: Email: [email protected]: Web: www.controls-unlimited.com
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