Download 15 Stout St

15 Stout St
General building description:
This former Departmental Building, built in 1939, is located in the Wellington City Council Stout Street
Precinct Heritage Area, the building is an “H” shaped plan configuration around a central interior
courtyard and lightwell. Constructed in the art moderne style, many Wellingtonians consider it a
favourite, with bold granite cladding and curved bronze corner windows. As a Category 2 listed
heritage building the project has ensure the survival and rejuvenation of a previously vacant
building. The building has been completely transformed into a modern 5 Green Star office space with
an integrated fit out for a single tenant, all new services and central plant, new core risers and toilets
as well as additional lifts. A collaborative team approach was undertaken that allowed for clear
communication across all parties and ensured a superior build
A series of full scale load tests were conducted where selected beams were isolated and then jacked
cyclically using hydraulic rams in order to determine the joints’ true moment/rotation characteristics.
As a New Zealand first, this onsite structural testing allowed the redevelopment work to proceed
without the requirement for seismic strengthening. The existing building was complete striped
back to a bare shell including removal of all services and plant. The existing internal courtyard
underwent significant structural demolition followed by the addition of a new structure creating an
additional 3,000 square metres to the building’s gross floor area.
The glazed internal atrium is one of the key elements of the buildings composition, allowing visual
connection between floors and offering sea views to the upper stories. The atrium features acoustic
panels made from damaged timber taken from the existing roof structure. The ground floor holds a
variety of meeting and conference rooms along with a public cafe and is a key space for social and
collaborative work. 15 Stout Street won Best in Category and two Excellence at the 2015 New Zealand
Property Council, Rider Levett Bucknall Awards, as well as Gold at the New Zealand Commercial
Property Awards.
Levels 1-6 GFA= 2500 m2, NLA=2300 m2
HVAC system overview

3 No main heat recovery air handling units to be installed within the rooftop plant room. The
air handling units shall be furnished complete with fan section, coil section with internal hot
water heating coil, rotary heat exchanger and filter section. The air handling units shall provide
ventilation air to the building.

2 No. smoke clearance supply fans. These fans shall be installed in parallel to the main air
handling units and utilize the same supply riser duct.

3 No air cooled chillers located outside on level 8 roof. Chilled water shall be circulated
through the chiller by 3 No. primary chilled water pumps.

3 No secondary chilled water pumps supplying a single set of main chilled water risers
running vertically up the building with branches and distribution piping on Ground floor to
Level 8.

3 No. gas fired condensing boilers installed within the rooftop plant room. The boilers will be
furnished complete with individual low loss vertical headers, primary hot water circulating
pumps and cascade controller.

2 No main supply air riser ducts with branches and distribution ducts on Ground floor to Level
8.

3 No Atrium smoke exhaust fans with attenuators.

2 No. toilet extract fan systems. One will serve the toilets within the core area on all floors and
basement shower and locker rooms. The other will serve toilets in the south-east corner of
the ground floor.

1 No. utility exhaust fan system consisting of fan, extract ductwork, attenuators and exhaust
grilles to serve tenant defined areas.

1 No. cleaners’ cupboard extract fan system consisting of fan, extract ductwork and exhaust
grilles.

309 No 4-pipe (heating and cooling) fan coil units installed throughout the building, generally
located within a central bulkhead, complete with distribution ductwork and diffusers.

8 No. electric radiant heaters serving the space at the bottom of the atrium. Heaters shall be
located around the perimeter of the atrium.

2 No. standalone VRF systems serving the building’s communications rooms. One will serve
the Comms rooms from Ground floor to Level 3 and the other from Level 4 to Level 8.

2 No. exhaust fans serving the basement transformer room.

Car park ventilation system.

On-floor condensate piping and connection to existing vertical riser pipes within columns
around the perimeter of the building.

Building automation system complete with desktop workstation.

Fire fan control and indication panel (FFCP).

Building fine tuning.
Equipment specifications:
Heat recovery air handling units: 2 no. Swegon Gold model 80D2RX, supply air=9.5m3/s,
extract=7.5m3/s. 1 no. Swegon Gold model 120D2RX, supply air=12.5 m3/s, extract=7.0m3/s
Condensing boilers: 3 no. Rendamax R604 each with capacity of 350kW
Air cooled chillers: 3 no. Swegon Tetris 37.4 LN (low noise) each with capacity of 400kW
Primary chilled water pumps: 3 no. Grundfos NBG80-65-160 with capacity of 16 l/s @ 150kPa head
Secondary chilled water pumps: 3 no. Grundfos NBG150-125-250 with capacity of 16 l/s @ 300kPa
head
Primary HW pumps: supplied with boilers
Secondary HW pumps: 3 no. Grundfos NBG65-230 with capacity of 6 l/s @ 300kPa head
EC multizone fan coil units: Temperzone IXDL-various sizes
EC single zone FCU’s: Temperzone IMDL-various sizes
Smoke extract fans: 90 m3/s total
Fans: Fantech-various models
BMS: Automated Logic as installed by Building Automation systems (BAS)
Unusual Features

Has heat recovery air handling units that recover heat from extract system to preheat
incoming fresh air

First Project to use Temperzone EC fan multizone fan coil units. They didn’t even have
printed brochures available at the time of design.

Plant had to have ability to deliver twice the normal supply air in Fire mode. This necessitated
having supplementary fire supply air fans in parallel with the AHU’s.

Atrium served as vertical exhaust air shaft with exhaust chamber at the roof
Challenges

Low floor to floor heights combined with deep structural beams made reticulation of on-floor
services difficult

Working with Developer who’s primary concern was cost

Client decided to go for 5 star rating late in the design piece which required a total redesign of
the plant

Very aggressive design/construction programme

Building’s beam arrangement created difficulties in locating FCU’s/supply air diffusers

Heat recovery ducts from top of the atrium had to cross the chiller mounting platform to get
into the plantroom.

AHU’s have common supply air “header” so that in the event of a single AHU failure-a
reduced amount of supply air can be delivered to each riser. Fitting this into the plantroom
was a big challenge.

First project “kick-off” meeting was in September 2012. Client moved into building in July
2014.