IMPACT OF INTERIOR LIGHTING POWER REDUCTIONS ON COMMERCIAL BUILDING ENERGY USE

摘要

Lighting energy conservation measures arerntypically recommended in commercialrnbui1ding energy audits. Over 60% of therncost in Bonneville Power's commercialrnbuilding energy conservation programs arernrelated to lighting.rnTo estimate lighting energy savings it isrnnot uncommon to ignore detailed energyrnsimulations which account forrninteractions of lighting with heating andrncooling systems and simply multiply hoursrnof use by wattage reduction. This paperrninvestigates the potential error inrnperforming simplified 1ightingrncalculations which ignore interactions.rnA series of computerized hourly energyrnsimulatinos, using the DOE-2.1C program,rnwere conducted on prototypical smallrnoffice and small retail buildings. Forrndifferent interior lighting levels,rnannual energy consumption and lightingrnenergy consumption are estimated. Thernprototypical buildings are modelled withrndifferent configurations, each of whichrnis modelled using the different interiorrn1ighting levels. The energy simulationsrnare performed for four pacific northwestrncities: Seattle, WA, Yakima, WA, NorthrnBend, OR, and Missoula, MT. The samernprototypical buildings were input ontornASEAM-2.1 and modelled using slightlyrndifferent weather data.rnResults show that, regardless of thernsimulation model used, the error inrnperforming a manual calculation tornestimate lighting energy savings variesrnfrom a high of over 125% for a weatherrnsensitive bui1ding in a co1d climate to arnlow of 0% for a weatherized building in arnmoderate climate.rnIt is concluded that for thesernprototypical commercial buildings thernimpact of reductions in interior lightingrnpower on total building energy usage isrnsignificantly different than a simplernone-to-one, relationship. The impactrndepends on several factors such as:rnclimatic location, modelling assumptions