Carbon Management Steering Board 7 th October 2011 Filter Survey - Update CARBON MANAGEMENT BOARD – October 2011

Initiative Trials on filter medium used in AHU’s in SAF suggest significant energy / carbon savings are possible. Improvements can be achieved in two respects: –Reducing HEPA supply air medium in non-critical areas. –Replacement of standard AHU filter medium with more efficient filters, where plant space is available. Optimisation of filter changing; study to measure energy consumption over lifetime of filters to identify the time when energy costs exceed the value of maintenance costs CARBON MANAGEMENT BOARD – October 2011

Progress to date A survey of all College buildings is 80% complete, with only two building groups ongoing. HEPA filters on the supply air to SAF AHU’s 1, 2, 3, 4, 17 & 18 in SAF building, have been changed fro H13 to H10 grade Study of filter media efficiency has commenced on AHU 3 in Biochemistry.

CARBON MANAGEMENT BOARD – October 2011 SAF HEPA filter changes H13 filters changed on AHU’s to H10 media, between 23 rd and 31 st August 2011 Immediate reduction in fan speed resulted across all six AHU’s, although a fault on a pressure transducer serving AHU 2 was discovered Savings identified across the units are: –55,419 kWhr per annum –30.15 tonnes CO2 per annum –£3,602 electricity cost per annum –Plus lower maintenance costs per annum

CARBON MANAGEMENT BOARD – October 2011 AHU % reduction in power consumed