MEETING OF COUNCIL - Town of Cambridge
MEETING OF COUNCIL - Town of Cambridge
MEETING OF COUNCIL - Town of Cambridge
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<strong>COUNCIL</strong> MINUTESTUESDAY 26 FEBRUARY 2013System Evaluation CriteriaThese systems were evaluated against key criteria:-• Technical suitability;• Whole <strong>of</strong> life costs;• Current code compliance;• Environmental impacts; and• Spatial considerations and disruption upon <strong>Town</strong>'s operationFollowing this evaluation four options were shortlisted as follows:-ID System InitialCapitalCost20 Year LifeCycle CostEstimatedGreenhouse GasEmissions (TonnesCO 2 /Annum)1 Air cooled chiller system $1,020,000 $3,740,000 149(Like for like replacement).2 Water cooled chiller only. $1,300,000 $3,730,000 1263 Variable Refrigerant Volumesystem (VRV).4 Water cooled chiller systemwith gas heating.$1,040,000 $2,450,000 92$1,720,000 $2,620,000 57The initial capital costs include a 10% contingency, allowance for phasing <strong>of</strong> works andpotential disruption during normal business hours. They also include pr<strong>of</strong>essional fees fordesign documentation, tender and contract administration. Note: the initial capital costs arealso included in the 20 year life cycle costs.The VRV system (Variable Refrigerant Volume) is the preferred option, predominantly due to:-• Low capital costs;• Greater economic life;• Lower operational costs; (Life Cycle Costs)• Does not require the provision <strong>of</strong> any gas services for heating;• Low environmental emissions;• System meets current BCA standard;• Providing greater comfort control;• System flexibility; and• VRV systems can be prioritised and staged over more that one year for construction.An option to simply replace the system "like for like" was reviewed and whilst it has minormeasurable benefits it was rejected due to:-• High "Whole <strong>of</strong> Life" costs;• Comprises <strong>of</strong> part system replacement only;• Existing inefficient electrical heating which does not meet current BCA standards; and• Higher environmental emissions.• Should works be required on the building system, BCA compliancy is not met.The annual environmental emissions have been estimated on normal working hours, Mondayto Friday.H:\CEO\GOV\<strong>COUNCIL</strong> MINUTES\13 MINUTES\FEBRUARY 2013\C CR.DOCX 129