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Low Carbon South West Breakfast Workshop
Light & EnergyTilly Shaw
[email protected] 21 November 2017
1 - Light and Energy in Buildings
§ In 2010 buildings accounted for 32% of total global final energy use.
§ This may double or triple by 2050, due to global demographic trends
§ The building sector has been shown to provide the greatest potential for delivering significant cuts in emissions at no cost
Sources: 1-IPCC AR5-Working Group 3 – Ch9; 2-UNEP Sustainable buildings and climate initiative.Photo courtesy of aturkus / www.flickr.com under creative commons license.
2 - Where is my energy going?
Ithinkwe’refairlyenergy-efficient,buthowcanIbe
sure?
ü Recordyourenergyuse,inkWh/yearand£/yearü Findthefloorareaforeachtypeofspace(forexampleserver
room,officespace)
ü Establishtrueoperatinghoursandotherpotential“energydrivers”foryourbuilding
ü ComparekWh/m2 tostandardbenchmarks,previousyears,orsimilarbuildings
...setupyourenergybaseline&comparetobenchmarks
3 – What does “good” look like?
0
100
200
300
400
500
600
Airconditioned
office
Naturallyventilatedoffice
Bank/Agency Smallretailoutlet-clothing
Smallretailoutlet- food
Kilowatt-h
oursperm
2flo
orarea,peryear
Electricity
Gas
4 – Where are the big wins?Airconditionedoffice- ElectricityUse Catering
HeatingandCooling
Lighting
OfficeEquipment
ICTandOther
Naturallyventilatedoffice- ElectricityUseCatering
HeatingandCooling
Lighting
OfficeEquipment
ICTandOther
Bank/Agency- ElectricityUseHeatingandCooling
Lighting
OfficeEquipment
ICTandOther
Source: CIBSE. Split by kilowatt-hours electric – (assumes space heating with gas)
3 - Lighting: what could you save?
4x2ftT8fluorescentpanel72W• Costtoupgradeto36WLED~£50each• Saving(officehours)~75kWhor£10/yr
2x4ftT5fluorescenttubes56W• Costtoupgradeto32WLED~£40(re-lamp)• Savings(officehours)~50kWhor£5/yr
HalogenGU1050W• Costtoupgradeto7WLED~£10each• Savings(officehours)~90kWhor£12/yr
Reviews have found that lighting retrofits in commercial buildings typically reduce lighting energy use by 30 – 60% (+ maintenance savings)
4 - HVAC: what could you save?A review of commercial building retrofits found typical savings of 25-50% HVAC consumption, through upgrading equipment and controls (without changing the building envelope).
Heating ventilation and cooling can be complex but there are some simple things everyone can ask about:
1. Is the plantroom equipment in “manual” or “in hand” mode?
2. Does heating and cooling occur at the same time in the same space?
3. Is the whole system adjusted to cope with a small problem area e.g. cold spots near a large window or doorway?
If your answer to any of the above is “yes” then a review of controls and/or zoning is likely to be cost-effective.
THANK YOU
Tilly ShawTechnical Energy Centre Operations ManagerEnergy & Technical Services
[email protected]: 01934 854 219
Mob: 07722 148 003
