Karl Helmink, P.E., CEM Retrocommissioning Manager University of Illinois. Retrocommissioning Saving the Planet One Building at a Time

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1 Karl Helmink, P.E., CEM Retrocommissioning Manager University of Illinois Retrocommissioning Saving the Planet One Building at a Time

2 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.

3 AIA Quality Assurance Learning Objectives 1. RCx strategies applied to a Campus Library 2. RCx strategies applied to a Venue for Performing Arts 3. RCx strategies applied to a Research Laboratory 4. RCx strategies applied to a Computer Research Facility

4 Illinois 18 buildings Average 27% energy reduction Almost 3 years of RCx team operation (July 2007) Accrued avoided utility costs of $5.2 million 2.6 million square feet of building space RCx dollars spent to date approx $4.0 million

5 Campus Library - ACES Architectural Statistics Opened ,000 Sq.Ft. Upper 3 floors Library Lower 2 floors College Space - Conference Rooms - Computer Labs - Office Space

6 Campus Library - ACES Mechanical Statistics Metered Campus Steam, Chilled Water & Elec. DDC Controls (Major Equip.) (2) VAV AHUs, Heat Exchangers Pneumatic Controls (Terminal) VAV terminal units Finned tube radiation Thermostats >10,000 CFM Toilet Exh. Before RCx $475,000/yr.

7 Campus Library - ACES Strategy Implemented: Occ. Schedules (3) Distinct Calendar Periods Spring / Fall Semesters: 8am to 11pm Summer Semester: 8am to 9pm Summer, Winter, Spring, Thanks Breaks: 8am to 5pm What Happens? Turn off Exhaust Fans Close OA Dampers Reduce SP setpoint

8 Campus Library - ACES Strategy Implemented: Control Sys. Analysis Pneumatic Review Floor branch line disconnected: VAVs Wide Open Faulty Humidity Sensor leading to problems with enthalpy economizer sequence Implemented HW Reheat Reset Schedule Encouraged patrons to have confidence in thermostats. Re-calibrated the VAVs minimum CFM

9 RCx Results Campus Library - ACES 42% energy reduction Accrued Savings in 2 yrs: $400,000 Cost to Retrocommission: $70,000 Payback = Less than one year

10 Krannert Center for the Performing Arts Architectural Statistics Opened ,000 Sq.Ft. 3 Large Performance Venues 6 Rehearsal spaces for Dance and Music Office and shop spaces

11 Krannert Center for the Performing Arts

12 Krannert Center for the Performing Arts Mechanical Statistics Metered Campus Steam, Chilled Water & Elec. Some DDC Controls (Major Equip.) (11) Constant Volume Units, Heat Exchangers VFDs added over time Pneumatic Controls (Terminal) Dual Duct boxes Finned tube radiation Thermostats Before RCx $1.2 million /year

13 Krannert Center for the Performing Arts

14 Krannert Center for the Performing Arts Strategy Implemented: Occ. Schedules (3) Distinct Times of Day Periods in Large Venue Spaces Off at night from 11 pm till 7 am 50% speed from 7am till 5 pm Full speed from 5 pm till 11 pm 50% speed all day on Mondays

15 Krannert Center for the Performing Arts Strategy Implemented: Control Sys. Analysis Developed web pages Add CO2 and humidity sensors Installed full DDC control on the AHUs They have asked that we return and look at further scheduling opportunities

16 Krannert Center for the Performing Arts RCx Results 35% energy reduction Annual savings of $525K per year Accrued Savings since visit: $1.3 million Cost to Retrocommission: $190K Payback less than 1 yr.

17 Madigan Laboratory Architectural Statistics Opened ,000 Sq.Ft. Laboratory space w/ fume hoods Animal holding rooms (No RCX in this third of the building) 200,000 CFM of 100% OA Some 8am -5pm occupancy

18 Madigan Laboratory Mechanical Statistics Metered Campus Steam, Chilled Water & Elec. DDC Controls (Major Equip.) (3) VAV AHUs, Heat Exchangers Pneumatic Controls (Terminal) Room pressurization control scheme Plenum ceiling system Thermostats Before RCx $1.46 million per year

19 Madigan Laboratory

20 Madigan Laboratory Strategies Implemented: Lab ventilation rates Campus discussion Prior to RCX 15ACH Post RCX 10ACH Post RCX Unoccupied 4 ACH Added a relay to the light switch to initiate What Happened? Room controller replaced Educate folks about shutting fume hood sashes Fixed air flow monitoring stations

21 RCx Results Madigan Laboratory 28% energy reduction Savings in 1 yr: $450,000 Cost to Retrocommission: $350,000 Payback = Less than one year

22 Turner Hall

23 Siebel Center for Computer Science Architectural Statistics Opened ,000 Sq.Ft. Lower Floor Dense Computer Labs First Floor Classrooms & Grad. Offices 2 nd thru 4 th Floors - Graduate Labs & Offices - Professor Offices - Department & Business Offices Glass Exposure on north side

24 Siebel Center for Computer Science Mechanical Statistics Metered Campus Steam, Chilled Water & Elec. Hybrid Controls (DDC & Pneumatic) DDC VAV boxes w/ pneumatic HW actuators Pre-RCx $1.3 Million/year

25 Siebel Center for Computer Science Strategies Implemented: Implemented existing occupancy sensors into control strategy Fixed DDC programming 470 VAV boxes in building Larger deadband ranges on thermostats VERY LARGE PROGRAMMING PROBLEMS Leaking HW reheat valve problems Reduced airflow in over-designed spaces

26 Siebel Center for Computer Science Strategy Implemented: Control Sys. Analysis Implemented HW Reheat Reset Schedule Encouraged patrons to have confidence in thermostats. Reprogrammed these devices. Re-calibrated the VAVs minimum CFM

27 Siebel Center for Computer Science RCx Results 42% energy reduction Expected Savings per yr: $525,000 Cost to Retrocommission: $450,000 Expected Payback = Less than one year

28 Verification of Savings Predicting Future Usage Avoidance M P V E R A E R S D I U I F C R YTE Measuring Actual Usage Avoidance Verifying Metered Results

29 Thank you Karl Helmink Karl Helmink, May 2010 Copy or distribution of this file is strictly permitted without direct written consent.