ASHRAE Journal - August 2020 - 36

2020

ASHRAE TECHNOLOGY AWARD CASE STUDIES

Energy (kBtu)

energy efﬁciency and optimize thermal comfort.
800,000
GFIA Marketplace Energy Summary
The downdraft caused with a 26 ft (8 m) high by
700,000
178 ft (54 m) long glass wall system would be very
600,000
uncomfortable for passengers to enjoy a preﬂight
500,000
food or beverage. The downdraft calculation
400,000
determined that 42,000 Btu/h (12 kiW) of heat is
300,000
required to combat the height of the glass at each
200,000
bay. The heating sources were vertically spaced
100,000
8 ft (2.4 m) apart to reduce the required heat to
0
Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun
31,000 Btu/h (9 kW) at each bay. Ultimately, this
2018
|
2019
reduced the total building heating consumption
2018/2019 in Operation
Model
90.1-2010 Baseline Model
to 88,000 Btu/h (26 kW) in the marketplace during the heating season.
FIGURE 1 Baseline, proposed and actual energy consumption.
Other contributing factors to a holistic, energyefﬁcient approach included LED lighting
and daylight control, building management controlled interior shades, horizontal
exterior louvered sunscreens, refrigerant
economizer on the data center cooling and
demand controlled ventilation.
Incorporating all engineering and design
strategies into one full energy model
compared a baseline energy consumption of 112.9 kBtu/ft2⋅yr (1282.2 MJ/m2⋅yr)
and a predicted energy consumption of
72.2 kBtu/ft2⋅yr (819.9 MJ/m2⋅yr). That's
an energy reduction of 36% compared to
The new checkpoint and marketplace creates panoramic views of the airﬁeld through a 26 ft (8 m) high by
178 ft (54 m) long glass wall system.
the ASHRAE Standard 90.1-2010 baseline.
Actual energy consumption of the expansion
reaching the zone, and that infiltration would be
so far is 37 kBtu/ft2⋅yr (420 MJ/m2⋅yr), 67% energy savings compared to the baseline (Figure 1).
kept to an absolute minimum.
The primary airside systems consisted of a displaceIndoor Air Quality and Thermal Comfort
ment air-handling unit serving the marketplace and
Indoor air quality (IAQ) was of utmost concern
security checkpoint zone and a multiple zone variable
during engineering, as jet engine exhaust fumes
air volume unit serving corridors, business centers
provide a unique challenge. The outdoor air is
and other transient spaces. Each space was designed
ducted from a green roof area, which helps bring
to meet or exceed ASHRAE Standard 62.1-2010 ventioxygen from the surrounding plants and reduce
lation rates. In the marketplace and security checkcontaminants. Following the intake, active carbon
point, zone air distribution effectiveness (Ez) of 1.2
for cooling and heating was achieved by introducing
filtration was integrated into the 100% dedicated
air low to the ﬁnished ﬂoor (within the breathing
outdoor air energy recovery unit to supply fresh
pretreated air to each of the individual air-handling zone) near room temperature. This near room neutral
air allows heat from passengers and equipment to
units beneath the marketplace. MERV 8 prefilters
quickly produce a thermal plume and remove conand MERV 13 final filters with airflow monitoring
taminants and heat away from the breathing zone.
stations, CO2 monitoring, and building pressurization control are all used on each of the airside
This heated contaminated air is then captured via
systems to ensure that adequate ventilation air was
high return grilles above the main occupied space to
36

ASHRAE JOURNAL

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AU G UST 2020

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ASHRAE Journal - August 2020

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