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Ipswich City Council Administration Building

Ipswich City Council Administration Building

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The 3 story ICC Administration Building in Ipswich was air conditioned using four large DX cooling only ducted air conditioning systems each fitted with large electric re-heaters. An unserviceable DX pre conditioner was mounted on the roof together with the four condensing units on a concrete plant plinth.

All systems used R22 refrigerant. Scope of work completed by DTS was to, consult, engineer, design and construct a new chilled water system, including new 680kW air cooled, turbo core Quantum chiller, and duty and standby ChW pumps, 5 new ChW AHUs, 1 new ChW pre-conditioner and 36 new VAV and zone reheat, upgrade of electrical distribution system for the mechanical services including new MSSBs and new BMS.  During the course of the consultancy DTS engaged civil engineers to x-ray the roof plant plinth to confirm that the plinth was subject to cracking though its entire thickness and had developed corrosion of the reinforcing steel in the plinth.

DTS proposed the manufacture and ultimately designed a new plant platform above a ground level annex of the building. The platform provides easy and safe service access to the chiller and the primary ChW pumps and MSSB. A new ChW pre-conditioner complete with air to air energy recovery heat exchangers was installed on the roof to pre-condition outdoor air to 18oC before entering the common return air plenum and mixing with the return air from three of the building AHUs. This had the effect of lessening the required conditioned supply air required by each floor of the building.

The energy conserving strategies adopted for this building design by DTS included:

  • Optimum start / stopadmin building image
  • Night purge
  • Economy cycle
  • Ventilation control
  • Heat recovery from exhaust air to precool outdoor air
  • Supply air temperature reset
  • Supply static pressure reset
  • Supply chilled water temperature reset
  • VAV control of zone temperatures with zone reheat in each of 32 VAV boxes, thus eliminating full cooling and reheating of every zone on each floor
  • A 2000 litre buffer tank provided thermal capacity to prevent short cycling of chiller at low load conditions