HKGBC ACT-Shop Concept and Progress 24 JAN 2017 1 Content 1. - PowerPoint PPT Presentation

HKGBC ACT-Shop Concept and Progress 24 JAN 2017 1

Content 1. Concept and Objective of ACT-Shop 2. Progress Update a) Case Sharing b) Survey Findings 3. Way Forward & Timeline 2

Idea of ACT-Shop Knowledge-based • Buildings as living laboratories • HKGBC as facilitator • Learning from peers • Building up in-house competence • Together 3

Objectives • Actively supporting HK gov’s Climate Ready@HK • Building up the competence for the industry on retro- commissioning through • developing the data/knowledge base • developing a systematic approach for retro-commissioning • demonstrating the value of retro-commissioning • transferring the knowledge and skills to the industry • establishing a practical operation & management system • Promoting the adoption of best practices to the industry 4

PROGRESS UPDATE CASE SHARING Modifica- Screening Re-tuning Retrofit tion 5

Modifica- Case Sharing Screening Re-tuning Retrofit tion On-site screening Data screening Malfunctioned plants Data inconsistency Sequencing Profile 100.0 Poor 80.0 % of FLA 60.0 40.0 20.0 Good 0.0 0.0 1000.0 2000.0 3000.0 System Cooling Load (kW) Fault readings from control panel PAU Coil Valve Status Profile 1 Chiller 2 Chiller 3 Chiller (Aug 15-20) Valve Opening % 100 50 Data availability 0 0 2 4 6 8 10 12 14 16 18 20 22 24 Daily Hour System COP vs Outdoor Temp. 15/F 12.0 10.0 8.0 COP 6.0 4.0 2.0 0.0 10.0 20.0 30.0 40.0 Outdoor Air Temperature ( o C) 6

Modifica- Case Sharing Screening Re-tuning Retrofit tion Poor Poor Good Action: Good Operate 3 chillers within 25%-50% loading range Air-Cooled Chiller Before After Verified Results: 5 4.5 Annual energy saving 4 3.5 226,000 kWh (4.75%) 3 COP 2.5 2 8.2% 1.5 1 0.5 0 30% 40% 50% 60% 70% 80% 90% 100% Cooling Load Average COP: 3.39 Average COP: 3.67 7

Modifica- Case Sharing Screening Re-tuning Retrofit tion Cooling Load Profile (15-Aug) 120 5000 Chilled Water Flow Rate (L/s) Cooling Load (kW) 100 4000 80 3000 60 2000 40 Action: 1000 20 Installation of pressure 0 0 0 2 4 6 8 10 12 14 16 18 20 22 24 sensor at critical path Daily Hour Progress: for pump flowrate Chilled Water Flow Cooling Load Installation of pressure sensors control in progress Differential Temperature of water variation Potential Saving: with demand Annual pump power saving = 7.0 VSD desirable range 6.0 70,000 kWh (40%) Temperature (°C) 5.0 4.0 3.0 2.0 1.0 0.0 0.0 500.0 1000.0 1500.0 2000.0 2500.0 Cooling Load (kW) VSD non- desirable 15-Aug range 8

Modifica- Case Sharing Screening Re-tuning Retrofit tion Estimated Cooling Load Profile 5000 40 Cooling Load (kW) Outdoor Air Temperature ( o C) Action: 4000 30 3000 Sequencing Profile 20 Evaluate 2000 Poor 10 1000 100% options for Full Load Ampere 0 0 80% chiller 60% replacement 40% Cooling Load per day Outdoor Temperature 20% Good 0% 0 1,000 2,000 3,000 4,000 5,000 6,000 Original Option 1 Option 2 Option 3 Cooling Load (kW) Chiller 4 x 400 TR 3 x 400 TR 2 x 400 TR 2 x 450 TR 1 Chiller 2 Chiller 3 Chiller 4 Chiller Air-cooled Air-cooled Air-cooled Air-cooled (VSD) (VSD) (VSD) (VSD) Estimated 9-10 years 8 years 6 years 5.5-6 years Payback Annual Saving 1,365,000 1,365,000 1,210,000 1,490,000 Unable to meet chilled water (kWh) ROI @10 th year supply temperature set-point 10% 32% 74% 79% IRR @10 th year 3% 7% 13% 13% P.s. Variable Speed Drive (VSD) 9

Saving Summary of Re-tuning/Modification Suggested Re-tuning Work Bld A Bld B Bld C Bld D Bld E Chillers Reduce chiller operation (N-1) to achieve higher 5-6% 3-5% 3-5% <1 year 3-5 year <1 year overall COP 1-3% 1-3% 1-3% Increase Tcws <1 year <1 year <1 year 0-1% 1-3% 0-1% 1-2% 0-1% Max. demand shedding <1 year <1 year <1 year <1 year <1 year Pumps (chilled water flow) 1-3% 1-3% 1-3% Re-tune bypass valve setting <1 year <1 year <1 year Install differential pressure sensors at the critical 1-3% 1-3% <1 year <1 year path 3-5% 3-5% Install VSD on the existing chilled water pumps N/A N/A 3-5 year 3-5 year Cooling towers 1-3% 1-3% Reactive cooling tower (CT) optimisation N/A N/A N/A <1 year <1 year 10

Feedback to Designers Provide a separate system for data centre/24-hour A/C • premises Plant sizing making reference to existing buildings • Plant & equipment design for part-load efficiency • Adequate instrumentation (Industrial grade) • Capability of BMS to suit operators’ need • 11

PROGRESS UPDATE SURVEY FINDINGS 12

Survey Findings Knowledge Gain on Retro-Commissioning: 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 Regular re-tuning Evaluation of system Regular calibration of Data logging Continuous BMS application performance instrument improvement Before ACT-Shop (average) After ACT-Shop (average) 13

Survey Findings (con’t) Time spent: Suggested ACT-Shop Programme Period Extra Time Spent in ACT-Shop 3 months 6 months <10% 20% 30% >40% 1 year more than 1 year Most participant spent less Participants prefer lasting for than 10 % of time one year or longer. 14

Survey Findings (con’t) Future Training Programme: Suggested Training Items Suggested Training Sessions 5 5 4 4 3 3 2 2 1 1 0 System Performance Analysis System 0 Optimisation Evaluation Tool Performance 1 2 3 4 or above At least 3 training sessions All training items are important are required 15

WAY FORWARD & TIMELINE 16

ACT-Shop Series (Short & Medium Terms) Building up knowledge & competence for ACT-Shop • participating building operators/services providers Target • At least one building of the 20+ large commercial • building owners + a few other pilots On-going knowledge up-dating • Reinforcement and Extending to Industry Active Training • Forums Continuous • Sharing Experience sharing with EMSD & Industry • Best Practice Notes • 17

Active Training Target Participants • Individual involves in managing / operating a building • Service providers / equipment / system providers / contractors • Encourage operator/building manager to come with services provider • Mode of training • Semi-ACT-Shop • Gone through the essential process of retro-commissioning • Exercise using data from participants’ buildings • Pilot project on an energy saving project from participants • Participants expected to be able to: • Have in-depth knowledge and know how on proper retro-commissioning • lead in-house team or service provider to carry out proper retro-commissioning • Specify requirements to service providers when contract out the process • 18

Programme Timeline – ACT-Shop Series Jul 2016 Feb 2017 Jul 2017 Feb 2018 Jul 2018 Mar 2017 Nov 2016 Oct 2017 2nd Batch Registration 3rd Batch Registration 4th Batch Registration 1 st Batch 5 2 nd Batch 5 + 1 3 rd Batch 5 + 1 4 th Batch 5 + 1 Preparation Work Preparation Work Preparation Work Active Training Class (Session 1) Active Training Class (Session 2) Continuous Sharing

e-O&M Manual + Benchmarking Purposed e-O&M Manual: Building Level System Level Air-Cooled Chiller 5 4 3 COP 2 1 Equipment Level Chiller Sequencing Control 0 30% 50% 70% 90% Cooling Load

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Active Training (Q&A) Module Structure • Theory • Basic theories on HVAC relating to energy efficiency • Basic mathematical and analytical methods used during the training • Knowledge based retro-commissioning based on real case and data • Data collections, screening and data analysis, • Identifying opportunities • Saving estimates and evaluation • Practical methods on implementing improvements • Measurement and verification • Exercises with participants’ data • Technology sharing by suppliers • Performance characteristics of major equipment/BMS/services/design • New technologies • Industry updates • Government, other institutions or other speakers • Group or individual project (optional) • An energy saving project report demonstrating what has learnt (saving • estimation, implementation, measurement & verification) Future modules on knowledge based energy management • 22