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Hong Kong Building Energy Code BEC 2015 vs BEC 2018
John Herbert
Registered Energy Assessor (REA)
The new updated Hong Kong Building Energy Code BEC 2018 code became effective on 16 May 2019 for new buildings, the code is available to download from the EMSD
website here is the link BEC 2018 version
Hong Kong BEC 2015 vs BEC 2018
Comparing the BEC 2015 vs BEC 2018, the main highlights for this update include:
Lighting Power Density (LPD) - 13 new room types added, with new LPD criteria
Lighting Power Density (LPD) - 12 spaces marginally strengthened with LPD
Automatic Lighting Control (ALC) - 13 new rooms types listed with related ALC
Automatic Lighting Control (ALC) - ALC with occupancy sensor is now permitted in toilets
LPD table BEC 2015 v 2018 - click for larger image
COP VRF - for water and air cooled units, COP requirement has been marginally strengthened
COP Chiller - for all types of chillers, full load and where applicable 75% load, COP requirement has been marginally strengthened
COP Heat Pump - new requirement, Heat Pumps were not previously defined, the updated code identifies what appears to be optimistic COP requirements for both air cooled and water cooled 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 official EMSD summary)
Cooling Tower Fan Speed Control - new requirement (clause 6.12.5)
Motor Efficiency - 3 phase motors 7.5kw and larger remain unchanged. 3 phase motors below 7.5kw the energy efficiency requirement has been marginally strengthened, the EMSD summary points to IE2 to IE3, view our summary table here
Total Harmonic Distortion - significant amendment - THD to be recorded every 15min, hourly, daily, monthly and annually, and the data stored for 36 months.
Lift and Escalator - minor strengthening of the requirements for lifts and escalators
LPD table BEC 2015 v 2018 - click for larger imageBEC 2015 vs BEC 2018 Summary
In summary, comparing the BEC 2015 vs BEC 2018 version, the updated 2018 version
has been marginally strenghened across the board.
Since air conditioning is highest portion of building energy usage, the largest
impact, energy wise, will be the updated chiller COP criteria, the motor efficiency
for larger condenser and chilled water pumps remains unchanged. Although new
requirements for cooling towers fans have been added.
The requirement for recording the Total Harmonic Distortion (THD) data for 36 months
is interesting, that will be challenging for buildings without providing a BMS because
most energy sub-meters, that record harmonics, don't record data for 3 years. It
will be a challenge for smaller projects, the requirement practically demands BMS
installation for every building.
About the Author
John Herbert is a
veteran chief engineer with more than 30 years international engineering experience, educated in
the United Kingdom, he has worked in the United Kingdom and then across Asia for more than two
decades engaged by international and local companies. He is a Hong Kong Registered Energy
Assessor (REA), a BEAM Professional, and stationed in Hong Kong.
