The M & V Guided Recommissioning Process. Energy & Water Conservation Program. September 2015 MOO
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1 The M & V Guided Recommissioning Process MOO Energy & Water Conservation Program September 2015
2 EWC Agenda MOO EWC Overview Our approach Progress Fault Detection Zone & customer feedback Variance reporting Rogue zone diagnostics Existing Building Commissioning Selection Process GDC BME M&V Plan for New Construction EUI & 3PIM Benchmarking BAS Trend Review
3 EWC Our Approach Behavior Programs Campus-Wide Scheduling, Resets, & Economizing Campus-Wide Fault Diagnostics System Component Replacements Existing Building (EB) Commissioning Measurement & Verification
4 Campus Distributed E&G Building EUI
5 Fault Detection Tools Bi-Monthly Variance Report Most Recent Two Weeks Steam Usage Previous Two Weeks Steam Usage Campus Average Increase in Steam Usage
6 Townes Hall AHU-08 BAS Graphic Pre-Heat Set Point: 50 o F Actual Temp: 110 o F
7 Summary of our Investigation Improperly installed and leaking preheat steam valve Steam costs increased $400 per day due to leak-by steam If left unaddressed, problem would have resulted in annual utility cost increases of $140,000 Short term solution: Steam to AHU was valved off Long term solution: Correct faulty installation of valve stem
8 TNH Steam Consumption
9 Fault Detection Tools Rogue Zone Diagnostics
10 Rogue Zone Diagnostics Reheat valve is open above 80% Space temp is 2 o F less than heating set point Space temp is 2 o F greater than cooling set point Damper position is above 95%
11 Rogue Zone Diagnostics
12 Impact of Rogue Zone Program at GDC Chilled Water (Ton-Hours) 4/28/ /7/2014 4/28/2015 Date
13 EWC EB Commissioning Selection Process EUI Ranking EUI change over year before 4 PIM modeling baseload and controllability BAS control level and potential for success Service request frequency and maintenance personnel feedback Validated Utility Data
14 Top 30 EUI Buildings
15 Example 3 PIM Chilled Water Model 0.2 Ton-hrs/day/sq-ft Base load Slope (performance efficiency) Scatter (controllability) 0 Pivot Temp 65 degrees Average Daily Temp Three Parameter Inverse Modeling, Dr. Kissock, University of Dayton
16 3PIM Chilled Water Campus Average PIM Chilled Water Campus Averages Ton-hr / Day / Sq-ft Campus Average Campus Lab Average Campus Office/Academic Avg Average Daily Temperature Three Parameter Inverse Modeling, Dr. Kissock, University of Daton
17 BAS Control Level and Potential for Success AHU Resets Supply air temp reset based on zone loads Air is pretreated by a dedicated OAU with chilled water and hot water/ steam coils Supply air temperature feedback and set-point in BAS All zones have room temp feedback in BAS All zones have terminal box damper feedback in BAS Return air humidity feedback in BAS Sensitive areas are evaluated and monitored Water-Side Resets Hot water supply temperature set-point reset based on outdoor air temperature Building has a heating hot water loop in place Supply temperature of hot water loop is tied into the BAS Outdoor air temperature is available for use in the reset schedule Hot water pump serves only HVAC loads
18 GDC Re-Commissioning Process 1. Baseline Validation Verify Metering & Billing 2. Reviewing documents As-builts (Mechanical Schedule, MEP Drawings) Sequence of Operations (SOO) Test and Balance (T&B) Commissioning Report Building Automation Systems (BAS)
19 GDC Re-Commissioning Process 3. Verify and resolve operational discrepancies Repaired/ replaced minor equipment sensors & actuators Rewrote and reprogrammed vague static pressure reset SOO Rewrote and reprogrammed outside air flow control Programmed supply air temperature reset Corrected inconsistent minimum air flow values 4. Optimize for energy conservation Optimized supply air and space temperature set-points Improved supply air temperature reset Added economizer programming Added rogue zone programming
20 VAV Reheat Valve Position VAV HW Valve Position % Nov. 6 th, 2014 Returned Room Temp Set-point to 70-74F Nov. 7 th, 2014 Reduced Air Flow Min. Date (Day/Hour)
21 GDC OAU-1 Fan Speed Percentage Fan Speed Percentage Nov. 6 th, 2014 Demand control ventilation sequence utilized Date (Day/Hour)
22 GDC 4 PIM Model After start of EB Cx but before tuning CW (kbtu/day) 10/6/13 9/30/14 10/1/14 12/9/14 Temperature ( o F) Generated using Energy Explorer
23 GDC 4 PIM Model After tuning CW (kbtu/day) 10/6/13 9/30/14 12/10/14 5/6/15 Temperature ( o F) Generated using Energy Explorer
24 % Avoidance Cost Avoidance Chilled Water Electricity Steam Total Measured (10/6/14-5/6/15) Daily Avoidance Annual Estimate 46% 5% 51% 37% $ 173, $ $ 297,327.48
25 BME Re-Commissioning 3. Verify and resolve operational discrepancies Correct fume hood controller CFM calculation Add schedule for motion sensors Adjust motion sensor ultrasonic sensitivity Correct AHU-3 return air CFM set-point calculation Replace CO2 sensors and enable demand controlled ventilation
26 MOO Offset = General Exhaust + Hood Exhaust Supply Air
27 BME Motion sensors not fully operational Design requires that ventilation rates reduce and lights turn off during unoccupied periods Programming was partially complete and motion sensors were installed Ultrasonic sensitivity was not adjusted Occupancy schedule was not programmed Located in higher hazard labs and not teaching labs If utilized, potential energy cost avoidance >$30,000 (ROI < 1 year)
28 M&V Plan for RBRH EUI & 3PIM Comparisons Against itself at 1, 2, 3, and 5 years from SC Campus averages National benchmarks Energy model BAS Trend Comparisons Against expected operation at 6 to 8 months after SC Set-up trending in system groups Use in preparation for enhanced commissioning Record anomalies and discrepancies
29 Building Automation Trend Review Energy Conservation Measure AHU static pressure reset AHU supply air temperature reset AHU set-back schedule Terminal box set-back Demand Control Ventilation Economizer Trended Point to Review Static pressure set point, actual static pressure, fan speed feedback Supply air temp set-point, actual supply air temp, relative humidity Fan speed feedback, valve position Damper position, reheat valve position Return air, space, and outside air CO2 value, outside air flow Outside air flow, Outside air & return air damper position, CHW valve position, mixed air temperature
30 The M & V Guided Recommissioning Process MOO Energy & Water Conservation Program September 2015
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