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

HKGBC ACT-Shop Concept and Progress

24 JAN 2017

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Content

• 1. Concept and Objective of ACT-Shop
• 2. Progress Update

a) Case Sharing b) Survey Findings

• 3. Way Forward & Timeline

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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

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PROGRESS UPDATE CASE SHARING

Screening Re-tuning Modifica- tion Retrofit

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Case Sharing

Screening Re-tuning Modifica- tion Retrofit

Malfunctioned plants

On-site screening Data screening

50 100 2 4 6 8 10 12 14 16 18 20 22 24 Valve Opening % Daily Hour PAU Coil Valve Status Profile (Aug 15-20) 15/F 0.0 20.0 40.0 60.0 80.0 100.0 0.0 1000.0 2000.0 3000.0 % of FLA System Cooling Load (kW)

Sequencing Profile

1 Chiller 2 Chiller 3 Chiller

Poor Good

0.0 2.0 4.0 6.0 8.0 10.0 12.0 10.0 20.0 30.0 40.0 COP Outdoor Air Temperature (oC)

System COP vs Outdoor Temp.

Data inconsistency Data availability Fault readings from control panel

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Case Sharing

0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 30% 40% 50% 60% 70% 80% 90% 100%

COP

Cooling Load

Air-Cooled Chiller

Action: Operate 3 chillers within 25%-50% loading range Verified Results: Annual energy saving 226,000 kWh (4.75%)

Before After Average COP: 3.39 Average COP: 3.67

Poor Good Poor Good

8.2%

Screening Re-tuning Modifica- tion Retrofit

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Case Sharing

Action: Installation of pressure sensor at critical path for pump flowrate control

1000 2000 3000 4000 5000 20 40 60 80 100 120 2 4 6 8 10 12 14 16 18 20 22 24 Cooling Load (kW) Chilled Water Flow Rate (L/s) Daily Hour

Cooling Load Profile (15-Aug)

Chilled Water Flow Cooling Load

Potential Saving: Annual pump power saving = 70,000 kWh (40%) Progress: Installation of pressure sensors in progress

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 0.0 500.0 1000.0 1500.0 2000.0 2500.0 Temperature (°C) Cooling Load (kW)

Differential Temperature of water variation with demand

15-Aug

VSD desirable range VSD non- desirable range

Screening Re-tuning Modifica- tion Retrofit

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Original Option 1 Option 2 Option 3 Chiller 4 x 400 TR Air-cooled (VSD) 3 x 400 TR Air-cooled (VSD) 2 x 400 TR Air-cooled (VSD) 2 x 450 TR Air-cooled (VSD) Estimated Payback 9-10 years 8 years 6 years 5.5-6 years Annual Saving (kWh) 1,365,000 1,365,000 1,210,000 1,490,000 ROI @10th year 10% 32% 74% 79% IRR @10th year 3% 7% 13% 13%

Case Sharing

Action: Evaluate

• ptions for

chiller replacement

P.s. Variable Speed Drive (VSD)

10 20 30 40 1000 2000 3000 4000 5000 Outdoor Air Temperature (oC) Cooling Load (kW)

Estimated Cooling Load Profile

Cooling Load per day Outdoor Temperature

0% 20% 40% 60% 80% 100% 1,000 2,000 3,000 4,000 5,000 6,000 Full Load Ampere Cooling Load (kW)

Sequencing Profile

1 Chiller 2 Chiller 3 Chiller 4 Chiller Poor Good

Unable to meet chilled water supply temperature set-point

Screening Re-tuning Modifica- tion Retrofit

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Suggested Re-tuning Work Bld A Bld B Bld C Bld D Bld E Chillers Reduce chiller operation (N-1) to achieve higher

• verall COP

5-6% <1 year 3-5% 3-5 year 3-5% <1 year

Increase Tcws

1-3% <1 year 1-3% <1 year 1-3% <1 year

• Max. demand shedding

0-1% <1 year 1-3% <1 year 0-1% <1 year 1-2% <1 year 0-1% <1 year

Pumps (chilled water flow) Re-tune bypass valve setting

1-3% <1 year 1-3% <1 year 1-3% <1 year

Install differential pressure sensors at the critical path

1-3% <1 year 1-3% <1 year

Install VSD on the existing chilled water pumps

N/A 3-5% 3-5 year 3-5% 3-5 year N/A

Cooling towers Reactive cooling tower (CT) optimisation

N/A N/A

1-3% <1 year

N/A

1-3% <1 year

Saving Summary of Re-tuning/Modification

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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

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PROGRESS UPDATE SURVEY FINDINGS

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Survey Findings

0.5 1 1.5 2 2.5 3 3.5 4 4.5 Regular re-tuning Evaluation of system performance Regular calibration of instrument Data logging Continuous improvement BMS application

Before ACT-Shop (average) After ACT-Shop (average)

Knowledge Gain on Retro-Commissioning:

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Survey Findings (con’t)

Time spent:

Extra Time Spent in ACT-Shop <10% 20% 30% >40% Suggested ACT-Shop Programme Period 3 months 6 months 1 year more than 1 year

Most participant spent less than 10 % of time Participants prefer lasting for

• ne year or longer.

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Survey Findings (con’t)

Future Training Programme:

1 2 3 4 5 1 2 3 4 or above

Suggested Training Sessions

1 2 3 4 5 System Optimisation Performance Evaluation Tool Analysis System Performance

Suggested Training Items

At least 3 training sessions are required All training items are important

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WAY FORWARD & TIMELINE

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ACT-Shop Series (Short & Medium Terms)

ACT-Shop

• Building up knowledge & competence for

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

Active Training

• Reinforcement and Extending to Industry

Continuous Sharing

• Forums
• Experience sharing with EMSD & Industry
• Best Practice Notes

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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

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Programme Timeline – ACT-Shop Series

2nd Batch Registration

Feb 2017 5 + 1 2nd Batch Jul 2016

3rd Batch Registration

Jul 2017 1st Batch 5 5 + 1

4th Batch Registration

Feb 2018 5 + 1 Jul 2018

Active Training Class (Session 1)

Mar 2017 Oct 2017 Continuous Sharing

Preparation Work Preparation Work

Active Training Class (Session 2)

3rd Batch 4th Batch Nov 2016

Preparation Work

Chiller Sequencing Control

Purposed e-O&M Manual:

Building Level System Level Equipment Level

1 2 3 4 5 30% 50% 70% 90%

COP

Cooling Load

Air-Cooled Chiller

e-O&M Manual + Benchmarking

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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

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