ASHRAE Journal - May 2014 - 17
Technical FeaTure
Fea
When it came time to design the HVAC system, the
design team recommended radiant cooling with a dedicated outdoor air system (DOAS). While the Infosys team
was eager to try something that had never been done
before, they did want the ability to compare the radiant
system to their best in class variable air volume (VAV)
system. At the time VAV systems were the standard in all
new buildings. Infosys decided to take the 250,000 ft2
(23 226 m2) building and divide it into two halves, one
with radiant cooling and the other with the optimized
VAV system.
Cooling Systems
The two cooling systems in the building, VAV and
radiant, are designed to operate independently and to
represent the best possible design of both systems. To
have a fair comparison, the SDB-1 building is split symmetrically. Both sides of the building have the same
orientation and, therefore, the same solar loads. All
parameters such as type of lighting, number of occupants and building envelope are kept the same on both
sides.
VAV Air-Conditioning System
* High efficiency VSD chiller (275 tons [967 kW]), VSD
pumps, VSD AHUs and VSD cooling tower;
* Chilled water design temperatures: supply 46°F
(7.8°C), return 60°F (15.6°C) high DT design;
* Primary variable flow pumping;
* Cooling tower approach: 4°F (2.2°C);
* AHUs with energy recovery wheel, evaporative cooling section and free cooling option for different ambient
condition advantages;
* Low pressure piping
and ducting design; and
VAV Cooling
* VAV boxes with low
minimum for controlling
airflow in office spaces. No
reheat coils were used due
to hot climate and low VAV
minimums.
Figure 2: South façade sun shading and lightshelf detail, full daylight, no direct
solar or glare.
* Chilled water design temperatures: supply 57°F
(14°C), return 63°F (17°C);
* DX coil with the DOAS AHU for achieving
dehumidification;
* Desiccant energy recovery wheel in DOAS;
* Primary variable flow pumping system;
* Cooling tower approach: 4°F (2.2°C);
* Low pressure piping and ducting design;
* Radiant in slab tubing 0.5 in. (12.5 mm) (inner diameter) cross-linked polyethylene (PEX) with overlapping 6
in. (150 mm) on center layout and manifolds with on/off
control valves;
* Passive chilled beams in conference rooms for fast
response and high loads; and
* Overhead ceiling fans for air movement.
The weather in Hyderabad is either hot and humid or hot
and dry. There is no cold season. Last year, the maximum
Radiant Cooling
Radiant Cooling System
* High efficiency VSD
chiller (275 tons [967 kW]),
VSD pumps, VSD DOAS
AHU and VSD cooling tower;
Figure 3: Infosys SDB-1 Hyderabad, typical floorplan.
M ay 2 0 1 4
ashrae.org
ASHRAE JouRnAl
17
ASHRAE Journal - May 2014
Table of Contents for the Digital Edition of ASHRAE Journal - May 2014
Contents
ASHRAE Journal - May 2014 - BB1
ASHRAE Journal - May 2014 - BB2
ASHRAE Journal - May 2014 - Cover1
ASHRAE Journal - May 2014 - Cover2
ASHRAE Journal - May 2014 - 1
ASHRAE Journal - May 2014 - 2
ASHRAE Journal - May 2014 - Contents
ASHRAE Journal - May 2014 - 4
ASHRAE Journal - May 2014 - 5
ASHRAE Journal - May 2014 - 6
ASHRAE Journal - May 2014 - 7
ASHRAE Journal - May 2014 - 8
ASHRAE Journal - May 2014 - 9
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ASHRAE Journal - May 2014 - 12
ASHRAE Journal - May 2014 - 13
ASHRAE Journal - May 2014 - 14
ASHRAE Journal - May 2014 - 15
ASHRAE Journal - May 2014 - 16
ASHRAE Journal - May 2014 - 17
ASHRAE Journal - May 2014 - 18
ASHRAE Journal - May 2014 - 19
ASHRAE Journal - May 2014 - 20
ASHRAE Journal - May 2014 - 21
ASHRAE Journal - May 2014 - 22
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ASHRAE Journal - May 2014 - 26
ASHRAE Journal - May 2014 - 27
ASHRAE Journal - May 2014 - 28
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ASHRAE Journal - May 2014 - 31
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ASHRAE Journal - May 2014 - Cover3
ASHRAE Journal - May 2014 - Cover4
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