Cashel Mall - BNZ Centre

Located in the centre of the Christchurch CBD, with frontages onto both Litchfield Street and Cashel Mall, this 29,000m2 development was completed in two stages, overlooking a central 1000m2 of landscaped courtyard.

Stage 1 – 10,400m2 six storey building comprising of office tenancies and a mezzanine carpark.

Stage 2 – 18,600m2 five storey building comprising of office tenancies with mezzanine carpark, and balcony areas overlooking the central courtyard.

The Challenge

The design engineers at BECA were tasked with designing a cost-effective solution for the heating, ventilation and air conditioning requirements of the buildings, while offering them the flexibility to personalise each space to suit the individual tenant’s requirements. In addition, there was also the need to minimise disruption due to any downtime of equipment, requiring no more than 25% redundancy on any one floor space at a time.

The Mitsubishi Electric Solution

Mitsubishi Electric R2 Systems were selected as the core solution for the space heating and air conditioning. This offered the design flexibility and the possibility to add and alter the units due to the unique 2 pipe design and architecture, while avoiding the costly exercise of re-piping the entire building when alterations and additions occurred.

The PAR-U02 Touch Screen Controller was selected as it offered an aesthetically appealing controller with increased functionality including light sensing or PIR sensing, visual indicators, and programmability of control items, again increasing the flexibility of fit out arrangements by reducing the requirements to rewire wall controllers during fit outs.

The second stage of the project had an increased fresh air requirement which was approached with efficiency in mind, using highly efficient heat recovery wheel AHU units supplied by Energy Products International with the incorporation of Mitsubishi Electric City Multi Y-Series ODU and AHU Controllers. When combined, these temper the final entering air temperature to the required condition in both heating and cooling, reducing the fresh air load on the building despite the high air volumes required by the tenant.

The buildings also incorporated full central control options with stage 1 using AG150 Touch Screens and BAC-HD150 BACnet Interfaces to the BMS System while stage 2 has been installed with AE200 and BACnet licencing, offering a full front-end controller with direct BACnet Control to reduce the space requirements in the mechanical boards and the overall cost of the control equipment.

Equipment Breakdown

Stage 1

Total Capacity

1019.3kW

Outdoor Units

17 x PURY-P200YLM-A-BS Heat Recovery Units

13 x PURY-P250YLM-A-BS Heat Recovery Units

1 x PURY-P300YLM-A-BS Heat Recovery Unit

4 x PURY-P350YLM-A-BS Heat Recovery Units

5 x SUZ-KD50VAQ

5 x PUHZ-RP71VHA5R1

2 x PUHZ-RP100VHA5R1

Indoor Units

134 x PEFY-P-VMA-E Mid-Static Ceiling Concealed Ducted Units

3 x PKFY-VBM-E High Wall Exposed Units

5 x SEZ-KD50VAQ Low-Static Split Ducted Units

7 x PKA-RPKAL High Wall Exposed Split Units

Wall Controllers

149 x PAR-U02MEDA Touch Screen PIR Controllers

110 x PAC-SE41TS-E Remote Sensors

12 x MAC-333IF-E Split System Interfaces

Central Controllers

2 x AG150A-J Central Controllers

2 x BAC-HD150-E BACnet Interfaces

5 x PAC-YG50ECA-J Expansion Controllers

Stage 2

Total Capacity

1750.4kW

Outdoor Units

6 x PURY-P200YLM-A-BS Heat Recovery Units

2 x PURY-P250YLM-A-BS Heat Recovery Units

9 x PURY-P300YLM-A-BS Heat Recovery Units

23 x PURY-P350YLM-A-BS Heat Recovery Units

3 x PUHY-P200YKB-A-BS Heat Pump Units

3 x PUHY-P250YKB-A-BS Heat Pump Units

2 x PUHY-P300YKB-A-BS Heat Pump Units

1 x PUHY-P350YKB-A-BS Heat Pump Unit

5 x PUHZ-RP71VHA5R1

4 x PUHZ-RP100VHA5R1

1 x MUZ-GE50VAD

Indoor Units

263 x PEFY-P-VMA-E Mid-Static Ceiling Concealed Ducted Units

1 x PKFY-VBM-E High Wall Exposed Unit

1 x MSZ-GE50VAD Low-Static Split Ducted Unit

9 x PKA-RPKAL High Wall Exposed Split Units

Wall Controllers

228 x PAR-U02MEDA Touch Screen PIR Controllers

5 x PAR-31MAA

17 x PAR-32MAA

46 x PAC-SE41TS-E Remote Sensors

1 x MAC-333IF-E Split System Interface

Central Controllers

2 x AE200E Central Controllers

4 x AE50E Sub Central Controllers

4 x EW50 Expansion Controllers

6 x BAC-HD150-E BACnet Interfaces

2 x BACnet Licences

Contractor

Consultant

Catalogues

City Multi New Zealand Showcase - Edition 2.pdf (10,526 KB)
Created: Monday 8th of September 2014

City Multi New Zealand Showcase - Edition 1.pdf (7,386 KB)
Created: Tuesday 11th of June 2013

City Multi World Wide Case Studies.pdf (3,184 KB)
Created: Wednesday 23rd of April 2008

Published: Wednesday, 8 May 2019

Cashel Mall - BNZ Centre