motors/fans were removed from the
FCUs and replaced with electronic
commutated motors. There is generally a 40% reduction of fan motor
power. All FCUs are connected via
wireless mesh network through digital
thermostats to the hotel management
system, which can determine the room
temperature and on/off status of the
FCUs depending on occupancy.
1. Variable speed drives are installed
for exhaust fans in busy kitchens so
the chefs can select cooking mode
(normal speed) or standby mode
(reduced speed) of fan operations.
2. AHU economizer mode is introduced to enable free cooling of
indoor spaces when the outdoor temperature is low. Enthalpy wheels are
also installed in AHUs to facilitate
pre-cooling/heating of outdoor air.
3. Programmable thermostats are
used to control runtimes, fan speeds,
and minimum adjustable temperatures of the FCUs in the back of
house office areas.
4. Over 95% of the traditional halogen, filament, fluorescent, and cold
cathode lighting at MGM MACAU was
replaced with LED lighting, resulting
in an annual electricity reduction of
4,807,462 k Wh. In addition, timer
switches are used in plant rooms, and
daylight sensors are used to control
the operations of aesthetic façade
lighting on the building perimeter.
Operation and Maintenance
Recommissioning. We recommissioned the casino areas in 2011 and
2014. During the recommissioning in
2011, we rebalanced all air diffusers,
recalibrated all VAV box proportional
bands, and rewrote the AHU control
logic to introduce economizer cycles.
Figure 3 BOILER REPLACEMENT AND ADDITION OF HEAT PUMPS PROJECT