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BEC 2018 Edition
15 May 2019

John A. Herbert
John A. Herbert
Registered Energy Assessor (REA)


The new BEC 2018 edition issued last year will take effect tomorrow on 16 May 2019. Thereafter, projects obtaining BD consent after that date, must comply with the new 2018 version.

The new BEC 2018 code is available to download from the EMSD website BEC 2018 version

building energy code BEC2018



The BEC 2018 edition provides marginal improvements over the 2015 version, highlights vs BEC 2015, include:

Lighting Power Density (LPD) - new types of spaces added, with new LPD criteria

Lighting Power Density (LPD) - all defined spaces marginally strengthened

Automatic Lighting Control (ALC) - new types of spaces requiring ALC added

Automatic Lighting Control (ALC) - sensor ALC now permitted in toilets

COP VRF - for water and air cooled units, COP requirement marginally strengthened

COP Chiller - for all types of chillers, full load and where applicable 75% load, COP requirement marginally strengthened

COP Heat Pump - new requirement, list of COP requirements in Table 6.12c

Cooling Tower Fan Efficiency - new requirement 1.7 L/s per kW for centrifugal fans, 3.4 L/s per kW for propeller or axial fans (not mentioned in the summary)

Cooling Tower Fan Speed Control - new requirement (clause 6.12.5)

Motor Efficiency - motors under 11kw energy efficiency requirement marginally strengthened
view table

Total Harmonic Distortion - 15min, hourly, daily, monthly and annual data captured and stored for 36 months

Lift and Escalator - minor strengthening for lifts and escalators requirements



In summary, overall the updated BEC version 2018 has been marginally strenghened across the board. The largest impact will be the updated chiller criteria, since air conditioning is highest portion of building energy usage.

The requirement to record the Total Harmonic Distortion (THD) data for 36 months will be challenging for buildings without BMS because most energy sub-meters that do record harmonics, don't store data for 3 years.

About the Author

John Herbert is a veteran engineer with more than 30 years engineering experience, educated in the United Kingdom he has worked across Asia for more than two decades engaged by international and local companies. He is a Hong Kong Registered Energy Assessor (REA) and BEAM Professional.



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date: 20-08-19
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