www . refrigerationandaircon . co . za RACA Journal I August 2023 37
Project
The same applied to the noise situation when breaking out and core drilling ).
This was largely adhered to , with relatively few complaints from the tenants . Tenants were kept advised of looming disruptions by Centre Management , and thus made the necessary arrangements as applicable . Core drilling , being the noisiest discipline , was carried out after hours .
The inevitable ‘ accident ’ occurred , resulting in some flooding of office areas . New ceiling tiles and carpeting sufficed in keeping tenant claims to a minimum .
Theft of cable and equipment was a constant occurrence , with doors and padlocks being broken at random . Clearly insurance cover is essential on any site in today ’ s crimeridden environment .
October and November 2017 saw the delivery of the ( 28 OFF ) chillers . The delivery of the air handling units was processed in batches and assembled in the relevant plantrooms as required in terms of the planned programme , to include the chilled water pipework , electrical and controls .
The moving of the existing cooling towers to make way for the chillers took place from 14 December 2017 to 3 February 2018 .
RPM Consulting Engineers
1 . Pumps and pipe work being installed immediately below the chiller modules . 2 . Commissioning of new modular chiller .
RPM Consulting Engineers
New CHW pumps being installed at roof level below chiller modules .
RPM Consulting Engineers
Modular air-cooled chillers on completion .
The main chiller rig took place over the weekend , 9-11 February 2018 , an uninterrupted period of 38 hours .
With the chillers rigged into place , work commenced with the chilled water pipework , pumps , and electrical supply at roof level . So as not to disrupt the entire building , the project was planned in four segments , each being a tower riser . As the chiller modules were put into operation , so were the air handling units installed in the place of the existing water-cooled packaged units , plantroom for plantroom . In this way , several plantroom change-overs were completed during each weekend shut-down ( Friday midday to 06h00 Monday ) with the smooth transition to a chilled water system and relatively little tenant disruption .
The original fresh air system was re-utilised and upgraded to include variable speed drives , motorised dampers , and CO 2 sensors throughout , to provide optimum energy savings . A night flushing programme was introduced to further enhance indoor conditions . Furthermore , when outside conditions dictate , controlled fresh air is introduced to the building for cooling
www . refrigerationandaircon . co . za RACA Journal I August 2023 37