ASHRAE Journal - December 2021 - 44
This Hong Kong building's 2019 EUI of
93 kWh/m2 (8.6 kWh/ft2) outperforms
ASHRAE Standard 100-2018's target by
36.9%
New Chillers Key to
Energy Reduction
BY RAYMOND M.H. YAU, PH.D., MEMBER ASHRAE; BARRY K.P. LAU, MEMBER ASHRAE
Chillers and other systems in a 1.2 million ft2 (111 484 m2) Hong Kong offi ce tower
and shopping mall were nearing the end of their useful lives. Building owners
undertook initiatives such as chiller replacement, retro-commissioning (RCx),
monitoring-based commissioning (MBCx) and other performance enhancement
work (Table 1 and Table 2) to reduce energy consumption. Among the improvements
were a reduction of chiller plant energy consumption of 26%.
Energy Effi ciency
Chiller Replacement
Two Pacifi c Place (2PP) was completed in 1990,
and its chillers had been in operation for more
than 25 years. As a result, chiller replacement
and retro-commissioning of the waterside system
were two of the largest initiatives to reduce energy
consumption.
Concerned about the deteriorating energy performance
and system reliability of the old chillers in
2PP, replacement of the three large capacity chillers
was commenced in late 2015 and completed in July
2016. After chiller replacement, the annual chiller
plant COP increased from 3.3 to 4.8. In 2017, the
energy consumption of the chillers was 12,535,059
kWh, an annual reduction of 4,844,922 kWh compared
to 2015.
Retro-Commissioning
Retro-commissioning (RCx) work was carried out
Raymond M.H. Yau, Ph.D., is general manager of technical services and sustainable development and Barry K.P. Lau is senior building services manager of technical
services and sustainable development at Swire Properties, Hong Kong SAR, China.
44
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ASHRAE Journal - December 2021
Table of Contents for the Digital Edition of ASHRAE Journal - December 2021
Contents
ASHRAE Journal - December 2021 - Intro
ASHRAE Journal - December 2021 - BB1
ASHRAE Journal - December 2021 - BB2
ASHRAE Journal - December 2021 - Cover1
ASHRAE Journal - December 2021 - Cover2
ASHRAE Journal - December 2021 - 1
ASHRAE Journal - December 2021 - Contents
ASHRAE Journal - December 2021 - 3
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ASHRAE Journal - December 2021 - Cover3
ASHRAE Journal - December 2021 - Cover4
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