ASHRAE Journal - February 2013 - S12

Feature
• The round supply air outlets are
camouflaged in the interior design.
Guest Rooms in Zone 1
• These six rooms are carved out from
the corridor earlier used for installing the outdoor units of Durbar
Hall’s old DX system.
• These rooms are partially connected to the systems feeding the
lower banquet hall.
• Four rooms are connected to one Photo 3: VRF outdoor units installed on the terrace with architectural camouflage.
of the 48 hp (36 kW) systems, which
caters partially to the banquet hall and partially to these Latest Technology
The HVAC system installed integrates the latest technolfour rooms.
• The remaining two rooms are connected to a 32 hp (24 ogy of digital VRF with small duct high velocity system. A
kW) system, which caters partially to the banquet hall and digital VRF system was selected especially for this critical
application because it provides variable capacity output and
partially to these two rooms.
is able to maintain room temperatures more precisely than
Presidential Rooms in Zone 2
• The six newly constructed rooms have an independent 48 splits, chillers or ducted systems. The small duct high velocity
system complements the high-side design in performance
hp (36 kW) system feeding the indoor units.
• All six rooms are presidential suites, each with a large sit- and integrates perfectly with the traditional interiors of the
ting area of 320 ft2 (30 m2) and a bedroom of 200 ft2 (19 m2). heritage building.
• Three rooms are equipped with indoor units, and the other Compressor
• The entire design was viable due to the feasibility of long
three with a small duct system to provide better height
piping lengths, of as much as 734 ft (224 m).
in the rooms.
• The VRF system with the digital vapor Injection scroll
Outdoor Units
compressor, along with the adaptability to connect AHUs
• A total of 16 outdoor units of 16 hp (12 kW) each are
with EEV kits made it possible to accomplish appropriate
installed, adding to 256 hp (191 kW).
equipment selection.
• These 256 hp (191 kW) outdoor units are divided into six
• Vapor injection technology provided the improved subdifferent refrigerant circuits: four of 48 hp (36 kW) and two
cooling, which is necessary for pipe lengths of more than
of 32 hp (24 kW), to give higher flexibility and diversity of
656 ft (200 m).
operations.
• Vapor injection allows the digital scroll to deliver over
• The new location of the entire battery of outdoor units is
capacity when the demand increases.
on the terrace. These units are architecturally camouflaged
• This system also has an built-in turbo intercooler that
to merge with the palace in the background (Photo 3).
improves the COP of the machine. The selection provides
• The new location gives more acoustic comfort as combetter full load and part load COP.
pared to the high noise levels at the earlier location.
• Longer piping has resulted in a reduced noise level of
Kitchen
around 55 dBA in the area surrounding the Durbar Hall,
• The kitchen is being supplied by an air washer of 22,300
from the earlier 85 dBA.
cfm (10 500 L/s).
• A 1,500 cfm (700 L/s) air washer feeds the service corridor.
• The exhaust is planned to go through two dry scrubbers:
one for the main kitchen (18,100 cfm [8500 L/s]) and the
other for the tandoor area (9,700 cfm [4600 L/s]).
• There was a space constraint in installing such large equipment. Actual measurements were taken and positions
marked on the floor before finalizing the dimensions and
carrying out the fabrication (Photo 4).
• The ducts for fresh air intake and exhaust were restricted
to the exterior wall of the palace to maintain the elevation
of the heritage building.
• Both scrubbers contain activated carbon filters to completely eliminate odor, and the air exhausted to the
atmosphere is almost odorless.
Photo 4: A view of the new kitchen for the banquet hall.
S12

February 2013

ASHRAE Journal - February 2013

Table of Contents for the Digital Edition of ASHRAE Journal - February 2013