MBCx Projects – Programs, Process, and Results Soda, Tan, Shields and Wurster David Jump, Ph.D., P.E., Matt Denny, P.E. Quantum Energy Services & Technologies, Inc. Arch 249X: The Secret Life of Buildings, Oct. 2008

2 Overview This presentation will discuss:  Process and Benefits of Monitoring-Based Commissioning Differences with RCx  Integration of M&V in RCx  Results from 3 Buildings  Progress on Wurster  Discussion

3 Monitoring-Based Commissioning (MBCx) Third-Party Energy Efficiency Partnership Program  Funded by public goods charges under auspices of CPUC  Available to University of California and California State University Campuses One of multiple RCx programs in California:  PG&E Core RCx Program  PG&E RCx Services and Incentives Program  SCE RCx Program  SCE/LA County RCx Partnership (LA County buildings only)  San Diego RCx Program

4 MBCx Project Scope Planning Phase  Develop M&V Plan (IPMVP or ASHRAE 14)  Add energy metering electric interval, gas pulse, steam, etc. systems level (e.g. chillers, AHU, etc.) Planning Phase  Initial site visit  Review documentation  Identify project requirements  Provide commissioning plan Investigation Phase  Inventory equipment  Calibrate sensors, conduct PM activities  Develop and carry out functional tests  Identify operational deficiencies  Document costs and benefits to correct deficiencies Implementation Phase  Install and commission measures  Document improved performance Hand-off Phase  Provide final report  Provide training Investigation Phase  Begin monitoring Energy Independent variables (OAT, etc.)  Develop Baseline energy model Implementation Phase  Collect post-installation data  Develop post-installation model  Determine Savings Hand-off Phase  Establish energy tracking system  Provide periodic savings reports  Address deficient performance RCx Process Additional MBCx Elements

5 Approach Option C - Whole Building Option B: Retrofit Isolation (HVAC Systems) Select measurement boundary

6 Approach Defining Systems - by ‘Services’ provided  Chilled water system: Chiller, CHW pumps, etc.  Air handling system: Supply fan, return fan, exhaust fan  Hot water system: Boiler, HW pumps

7 Three Case Studies UC Berkeley  Soda Hall – Computer Science Building, 109,000 ft 2  Tan Hall – Chemistry Building (100% OA), 106,000 ft 2 UC Davis  Shields Library – main undergraduate library, 400,070 ft 2

8 Soda Hall UC Berkeley’s Computer Science Department (24/7 operation) 109,000 ft 2 Central Plant ( ton chillers & associated equipment) Steam to hot water heating 3 Main VAV AHUs,  AHU1 serves building core,  AHUs 3 and 4 serve the perimeter, with hot water reheat

9 Soda Hall RCx Findings

10 M&V Approach for Soda Hall Assessment:  Whole-building electric and steam meters present  EMS that trends all points at 1 min (COV) intervals  8-month history of data  RCx measures in AHU and Chilled Water Systems Electric and steam savings  Very high EUI – unsure if can discern savings at whole building level M&V Approach:  Option B – applied at systems level (electric only)  Option C – whole building level (electric and steam)

11 Soda Hall Affected Systems

12 Define the Baseline Period & Collect Data 8 months of trended data collected Baseline period selected to cover widest range of operating conditions ~ 3 months. Energy use for each system to be totaled each day  Basis for analysis and reporting “Proxy” Variables on EMCS:  Constant load equipment: measure operating kW Equipment status becomes proxy for kW  Variable load equipment: log kW and VFD speed VFD speed signal becomes proxy for kW

13 “Proxy” Variable: VFD speed for kW

14 Baseline Model: Soda Hall Total Building ElectricBuilding Steam Peak Period ElectricHVAC System Electric

15 Soda Hall M&V: HVAC Systems

16 Soda Hall: Estimated vs. Verified Savings

17 Tan Hall UC Berkeley’s Chemistry and Chemical Engineering Departments 106,000 ft 2 Central Plant (475 ton chiller & associated equipment) Steam heating 1 Main 100% outside air VAV AHU  HP Supply Fans  4 60-HP Exhaust Fans

18 Tan Hall RCx Findings

19 M&V Approach for Tan Hall Assessment:  Whole-building electric and steam meters present  EMS that trends all points at 1 min (COV) intervals  8-month history of data  RCx measures in Chilled Water System and main AHU Electric and steam savings M&V Approach:  Option B – applied at systems level (electric only)  Option C – whole building level (electric and steam)

20 Tan Hall Affected Systems

21 M&V Models: Tan Hall Whole Building ElectricWhole Building Steam Peak Period ElectricChilled Water System Electric

22 Tan Hall M&V: Whole-Building Electric

23 Tan Hall M&V: Whole-Building Steam

24 Tan Hall M&V: Chilled Water System

25 Tan Hall: Estimated vs. Verified Savings

26 Shields Library UC Davis Undergraduate Library 400,072 ft 2 Chilled Water and Steam provided by campus central plant  2 CHW service entrances, variable volume  2 HW service entrances 11 AHU, 3 VAV, 8 CAV 5 electric meters

27 Shields Library RCx Findings Savings: no estimates prior to measure implementation

28 M&V Approach for Shields Library Assessment:  Whole-building meters present: 5 electric meters 2 CHW meters (installed as part of project) 3 HW meters (installed as part of project)  EMS that trends all points at 5 min intervals  RCx measures in AHU, CHW and HW pumps Electric, chilled water, and hot water savings M&V Approach:  Option C – whole building level

29 Shields Library: M&V Models ElectricChilled Water Steam

30 Shields Library: 480V Electric Meter Savings

31 Shields Library: Chilled Water Savings

32 Shields Library: Hot Water Savings

33 Costs Including all costs, project remains cost-effective:  Soda Hall: 1.7 year payback  Tan Hall: 0.7 year payback  Shields Library: 1.0 year payback Added costs of metering hardware and software did not overburden project’s costs In private sector – metering costs lower  Existing electric meters  Sophisticated BAS systems  MBCx approach should be viable