Large Campus Chilled Water System RetroCx

Transcription

1 Large Campus Chilled Water System RetroCx Leonard Rozek, President E Cube, Inc. 21 st National Conference on Building Commissioning

2 AIA Quality Assurance The Building Commissioning Association is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES). Credit(s) earned on completion of this program will be reported to AIA/CES for AIA members. Certificates of Completion for both AIA members and non-aia members are available upon request. This program is registered with 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 Presentation Description This session will focus on the EBCx process as related in this case study of a large central utility plant. We will be taking everyone through the process from the Scoping Phase to the Investigative Phase and a review of the current status of the Implementation Phase.

4 Learning Objectives At the end of this session, participants will be able to: 1. Evaluate existing facility operations and baseline current operations. 2. Verify accuracy of existing data collection inputs. 3. Identify different operational improvements, develop costs and savings for developing an ROI. 4. Develop an implementation strategy and execute this plan.

5 Existing Building Commissioning The Process Scoping and Planning Phase Investigation Phase Implementation PhaseMonitoring & Verification Phase The Building Commissioning Association has published Existing Building Commissioning Best Practices. 02a-e ef-dc1bf6c8f6af.pdf A copy can also be requested from the speakers.

6 The EBCx Program A holistic building evaluation, including maintenance and operational practices, as well as the value of potential capital improvements. No- and low-cost measures bring quick returns. Capital expenditures are defined and budgeted. Baseline of actual facility usage, not theoretical Should include a Measurement and Verification component to validate improvement measures. On-going commissioning contributes to savings persistence.

7 Case Study: Site Connecticut Campus Central Plant Gross Square Footage Campus 1,503,581 SF Conditioned Square Footage Campus 1,341,293 SF Multiple Buildings Varies, primarily offices and labs Occupancy 95% assumption

8 Central Plant Case Study: Equipment Heating Plant HTHW: 5 boilers ranging from 15 MMBTUH to 40 MMBTUH Hot Water Distribution Primary / Variable Secondary / Variable Tertiary Chiller Plant 9 Centrifugal Chillers ranging from 610 ton to 2,000 ton Chilled Water Distribution Primary / Variable Secondary / Variable Tertiary Cooling Tower 7 induced draft and 2 forced draft Condenser Pumps Individual pumps for each chiller

9 Case Study: Site

10 Accepted Energy Conservation Measures (ECM)

11 ECM Simple Payback

12 Chillers Chiller Plant Data Chiller Make Size (Tons) Year VFD Voltage CHW Pumps 1 Carrier NO hp 2 Carrier NO 480 w/ CH 1 3 Carrier NO 480 w/ CH 1 4 York 1, YES hp 5 York 1, YES hp 6 Carrier 2, NO HP 7 Carrier 2, NO 4160 w/ CH 6 8 York 2, NO hp 9 York 2, NO 4160 w/ CH 8

13 Cooling Towers Cooling Tower Data Tower Make Size (Tons) Type VFD Fan Motors CW Pumps 1 BAC 812 Ind. Draft YES 2 25 hp 1 50 hp 2 BAC 812 Ind. Draft YES 2 25 hp 1 50 hp 3 BAC 812 Ind. Draft YES 2 25 hp 1 50 hp 4 BAC 1,874 Forced Draft YES 4 50 hp hp 5 BAC 1,874 Forced Draft YES 4 50 hp hp 6 BAC 2,500 Ind. Draft YES 4 25 hp hp 7 Ceramic 2,000 Ind. Draft YES 2 50 hp hp 8 EVAPCO 2,500 Ind. Draft YES 4 25 hp hp 9 EVAPCO 2,500 Ind. Draft YES 4 25 hp hp

14 Case Study: Historical Operation

15 Case Study: ECM #4

16 Case Study: ECM #4

17 Case Study: ECM #4

18 Case Study: ECM #4

19 Case Study: ECM #4

20 Establishing Hours of Operation

21 Baselining of Actual Plant Operations

22 Proposed Optimized Chiller Staging

23 Case Study: ECM #5

24 Case Study: ECM #5

25 Case Study: ECM #5

26 Case Study: Capital Improvement

27 Case Study: Capital Improvement

28 Case Study ECM Summary

29 Tons New Loads!!!! New Cooling Load Estimates Outside Air Temp. F SAB tons PPH

30 New Load Profile Central Plant Chilled Water Load Load (tons) 6000 Existing Load w/sab&ppr OAT db ( F)

31 Measure #1: Optimized Chiller Selection New Chiller Selection Matrix CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH9 Capacity Load Avg bin DBT Hours ,500 1,500 2,000 2,000 2,000 2,000 12,830 % Over Capacity ,220 8,636 18% ,610 8,180 17% ,000 7,733 16% ,000 7,294 23% ,000 6,865 2% ,000 6,445 9% ,000 6,034 16% ,000 5,632 24% ,500 5,239 5% ,500 4,856 13% ,500 4,481 23% ,500 4,115 34% ,000 3,758 6% ,000 3,411 17% ,000 3,072 30% ,000 2,743 46% ,000 2,422 24% ,000 2,111 42% ,000 1,808 66% ,000 1,515 98% ,500 1,231 22% , % , % 4,972

32 New Savings and Payback Measure Original Savings New Savings Change % 1. Chiller Selection (OECM#4) $ 82,623 $ 69,719 $ (12,903) 16% 2. CW Temp. Reduction (OECM#2) $ 1,136 $ 1,613 $ % 3. Tower VFD Optimization (OECM#3) $ 28,561 $ 35,059 $ 6,498 23% 4. VSDs on C 4,5,7,8,& 9 $ 18,517 $ 32,562 $ 14,045 76% 5. Increase CHWT $ 19,718 $ 20,003 $ 285 1% 6. Combine Towers $ 23,813 $ 23,241 $ (572) 2% Totals $ 174,367 $ 182,196 $ 7,829 4% Simple Measure New Savings $ Cost Payback 1. Chiller Selection (OECM#4) $ 69,719 $ 26, CW Temp. Reduction (OECM#2) $ 1,613 $ 5, Tower VFD Optimization (OECM#3) $ 35,059 $ 21, VSDs on C 4,5,7,8,& 9 $ 32,562 $ 112, Increase CHWT $ 20,003 $ 14, Combine Towers $ 23,241 $ 450, Totals $ 182,196 $ 630,

33 THANK YOU Leonard R. Rozek, President E Cube, Inc., Boulder, Colorado

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