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Technical seminar on smart building energy management systems
By Ir Mannix M W CHAN and Ir Sally S Y LEUNG

The BS Division held the captioned seminar for a full house of engineers right after its Annual General Meeting on 25 April 2019. The speakers were Ir Paul C F Chan from CLP Power Hong Kong Ltd and Ir Stanley Y W Lam from CLPe Solution Ltd. The objectives of the seminar were to promote energy savings through the introduction of smart building energy management system (SBEMS) and to increase the awareness of combating climate change and reducing the carbon footprint of buildings.

The first part of the seminar was presented by Ir Lam. He started by explaining the technology behind SBEMS, which is a cloud-based platform backed-up by a proprietary artificial intelligence engine to perform data analytics and deliver intelligence by acquiring live data from the internet of things sensors, equipment, and systems. He then elaborated on how SBEMS can enhance the management and maintenance efficiency of buildings by automating time-consuming and labour-intensive processes through machine learning.

After that, Ir Chan discussed application of SBEMS at the CLP Sham Shui Po Centre (SSPoC). He listed out all the existing building management system limitations in the SSPoC such as no alert signals, the periods required to investigate defects and the lack of energy consumption analysis in daily operations. He also discussed how facility managers are hindered by these limitations, thus resulting in low effectiveness in managing energy use.

In order to overcome these limitations, a pilot trial of the SBEMS was conducted in the centre. Ir Chan explained the different stages of the project and the processes involved in each stage. The performance of SBEMS was assessed based on four major criteria: energy saving, customer satisfaction, system reliability and productivity enhancement. Ir Chan said that the pilot trial proved successful both technically and commercially.

Finally, the participants actively exchanged views on SBEMS. It was an inspiring sharing session for engineers to consider adopting SBEMS in the future. We would like to express our sincere thanks to the speakers and participants for making this event successful.

(L to R) Ir Sally S Y Leung, Ir Stanley Y W Lam, Ir Paul C F Chan and Ir Chris C M Lo

Technical seminar on the retro-commissioning of a chiller plant
By Ir Keith W P YUE

An inspiring seminar on the retro-commissioning of a chiller plant was presented by Ir Victor Leung on 15 October 2019. Ir Leung is an experienced specialist in heating, ventilation and air-conditioning system and is enthusiastic about the application of automatic controls and retro-commissioning to improve building energy efficiency. The seminar attracted a full house with over 110 participants attending.

Ir Leung first briefed on the scope, objectives, causes and benefits of retro-commissioning. He showed how significant energy savings could be obtained by carefully operating chiller plant equipment in its optimum operating conditions. He then gave an in-depth analysis of the actual energy saving benefits resulting from optimising operating parameters such as chilled/condensed water in supply/return temperature differences, and the variable speed drive cooling tower approach to temperature and chilled water supply pressures.

He also elaborated on how the correct type and location of control valves, sensors and flow meters could affect the effectiveness of automatic demand controls. He highlighted the improved energy saving opportunities of chiller plants operating in various periods and seasons. He introduced a case study on the assessment and operating efficiency of a variable speed chiller plant and how the daily variations of chiller plant energy efficiency were reduced after a retro-commissioning process despite increased daily cooling variations during summer that indicated an increased effectiveness of automated chiller plant controls to maximise operating energy efficiency.

A question-and-answer session was conducted after the presentation and the participants were impressed by the insights brought by Ir Leung.

On behalf of the BS Division and participants, Ir Keith Yue presented a certificate of appreciation to Ir Leung for his support and presentation that made the seminar such a success.

(L to R) Ir Chris C M Lo, Ir Victor W T Leung and Ir Keith W P Yue

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