Exceeding ASHRAE/ IESNA Lighting Energy Study for ABC High School

Transcription

1 Exceeding ASHRAE/ IESNA 90.1 Lighting Energy Study for ABC High School

2 Baseline Lighting Design estimated around ASHRAE/IESNA / 2007 Overall calculated building interior lighting density is 1.4 W/ft2. Exterior lighting connected load is 8.6 kw, and is controlled by combination schedule with photocell over-ride. Lighting equipment: Classrooms, offices, use T-8 lamps with electronic ballasts. The gymnasium uses MH-PS lamps with electronic ballasts. Outdoor lighting is provided by wall mounted MH luminaires for security and pole mounted MH parking and road luminaires. Controls: Classroom luminaires contain 3 lamps, and are switched in 3 levels (inner lamp, outer two lamps, all three lamps) from the classroom. Gym is controlled by zoned manual switching. Outdoor lighting is controlled by combination schedule with photocell over-ride.

3 Energy Efficient Lighting Design exceeding ASHRAE/IESNA / 2007 Overall calculated building interior lighting density is 1.1 W/ft2, exceeding by 22% the A/I Exterior lighting connected load is 3.9 kw, and is controlled by combination schedule with photocell over-ride. Lighting equipment: Classrooms, offices, use T-8 lamps with Hi-Ef, LBF electronic ballasts. The gymnasium uses T5HO high bay luminaires. Outdoor lighting is provided by wall mounted MH luminaires for security and pole mounted MH parking and road luminaires with reduced wattages Controls: Classrooms ceiling dual-technology occupancy sensors; luminaire mounted photosensors to control the window row. Shops and gym occupancy sensors.

4 Measure Name Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint. $ Cost Expectancy Simple Discounted efficient lighting (classes, corridors) 123, $5,281 $2,000 $72, $7, % efficient lighting (Gym) 45, $2,497 $500 $4, $15, % lighting control (classes, corridors) 69,652 - $2,566 -$300 $15, $4, % lighting control (Gym) 7,920 - $3,002 -$50 $1, $17, % efficient outdoor lighting 4,300 1 $237 $40 $1, $2, % efficient parking lighting 6,880 2 $378 $70 $1, $3, %

5 Indoor Lighting Baseline Studied area elem. Clas srm IES illum (lux) Bsl. illum. (lux) Luminaire type Luminaire input power (W) x4 3T8 fl. luminaire with acrylic lens and double switching IS-NBF el. Ballasts A/I LPD (W/ft 2 ) Baseline LPD (W/ft 2 ) Total Area (ft 2 ) Total Area % ,000 17% sec. classrm x4 3T8 fl. luminaire with acrylic lens and double switching IS-NBF el. Ballast ,320 21% shop T8 fl. strip luminaire with 10% up slotted reflector, IS-NBF el. Ballast ,000 4% gym W MHPS lum with mixed distrib. Acrylic globe and MHPS mag. Bal ,000 12% corridor* T8 fl. cube wrapped lum., IS-NBF el. Ballast ,850 7% Total 73,170 61%

6 Classroom 3T8- IS-NBF-90W Indoor Lighting Baseline

7 Gymnasium 350WPSMH-400W Indoor Lighting Baseline

8 Corridor 1T8- IS-NBF-31W Indoor Lighting Baseline

9 Outdoor Lighting Baseline Studied area IES illum (lux) Bsl. illum. (lux) Luminaire type Luminaire input power (W) A/I LPD (W/ft 2 ) Baseline LPD (W/ft 2 ) Total Area (ft 2 ) Total Area % perim. walkways W MH walpacks 300 N/A 2.3 5, Parking/ Parkade Lighting - Baseline Studied area IES illum (lux) Bsl. illum. (lux) Luminaire type Luminaire input power (W) A/I LPD (W/ ft 2 ) Baseline LPD (W/ ft 2 ) Total Area (ft 2 ) Total Area % exterior parking W MH luminaires on 25-ft poles 450 N/A 1.8 8,

10 Energy Efficient Design - Indoor Lighting Studied area IESNA av.illum. (lx) Design av.illum. (lx) Luminaire type and input power Luminaire input power (W) Baseline LPD (W/ft 2 ) Design LPD (W/ft 2 ) elementary classroom pendant 2T8 dir/indir, steel fl. luminaire, HiEf-IS-NBF el. Ballast (55W) in continuous row. Dimming row has same luminaires with dimming ballasts (66W) secondary classroom pendant 2T8 dir/indir, steel fl. luminaire, HiEf-IS-NBF el. Ballast (55W) in continuous row. Dimming row has same luminaires with dimming ballasts (66W) shop T8 fl. strip luminaire with 20% up slotted reflector, Hi-Ef IS-LBF el. Ballast gym T5HO high bay luminaires corridor* T8 fl. cube wrapped lum. Hi-Ef IS-LBF el. Ballast

11 Energy Efficient Design - Indoor Lighting Classroom 2T8 IS-HE-LBF

12 Energy Efficient Design - Indoor Lighting Gymnasium 4T5HO 230W

13 Corridor 2T8 IS-HE-LBF Energy Efficient Design - Indoor Lighting

14 Energy Efficient Design - Outdoor Lighting Studied area perim. walkways IESNA av.illum. (lx) Design av.illum. (lx) Luminaire type and input power Luminaire input power (W) Baseline LPD (W/ft 2 ) Design LPD (W/ ft 2 ) W MH walpacks Energy Efficient Design - Parking Lighting Studied area exterior parking IESNA av.illum. (lx) Design av.illum. (lx) Luminaire type and input power W MH luminaires on 25-ft poles (better design) Luminaire input power (W) Baseline LPD (W/ft 2 ) Design LPD (W/ft 2 )

15 ECM #1: Efficient Indoor Lighting Design (classes, shops and corridors) Description: Upgraded fluorescent systems in classrooms, shops and corridors. Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint $ Cost Expectancy Simple Discounted 123, $ 5,281 $ 2,000 $ 72, $ 7, % Discussion: This was modelled with an overall LPD reduction of 26% according to the detailed lighting study.

16 ECM #2: Efficient Indoor Lighting Design (Gym) Description: Upgraded suspended T5HO high-bay fixtures in the gym. Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint $ Cost Expectancy Simple Discounted 45, $ 2,497 $ 500 $ 4, $ 15,895 79% Discussion: This was modelled with an overall LPD reduction of 26% according to the detailed lighting study.

17 ECM #3: Automated Controls in classrooms, shops and corridors Description: Ceiling mounted occupancy sensors in classrooms; photosensors for window areas; wall mounted sensors/ switch combinations for small offices. Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint $ Cost Expectancy Simple Discounted 69,652 - $2,566 -$300 $15, $4, % Discussion: The overall savings for time of use reductions represent 39% of the total energy savings.

18 ECM #4: Automated Controls in the Gym Description: Occupancy sensors (Manual ON, Auto OFF) in the Gym. Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint $ Cost Expectancy Simple Discounted 7,920 - $3,002 -$50 $1, $17, % Discussion: This was modelled with an overall LPD reduction of 6% according to the detailed lighting study.

19 ECM #5: Efficient Outdoor Lighting Design Description: Upgraded (lower wattage) MH perimeter outdoor system with reduced wattage luminaires. Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint $ Cost Expectancy Simple Discounted 4,300 1 $237 $40 $1, $2, % Discussion: This was modelled with an overall LPD reduction of 10% according to the detailed lighting study.

20 ECM #6: Efficient Parking Lighting Design Description: Improved efficiency area lighting luminaire. Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint $ Cost Expectancy Simple Discounted 6,880 2 $378 $70 $1, $3, % Discussion: This was modelled with an overall LPD reduction of 10% according to the detailed lighting study.

21 Conservative Design Measures (Simple Payback < 3 yrs) The following bundle incorporates all measures that have a simple payback of less than 3 years: ECM #2: Efficient Indoor Lighting Design (Gym) ECM #4: Automated Controls in the Gym ECM #6: Efficient Parking Lighting Design The economic analysis and energy savings (relative to the baseline) of the bundle, incorporating interactive effects is shown below: Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint $ Cost Expectancy Simple Discounted 60, , , $57, %

22 Aggressive Design Measures (Simple Payback < 10 yrs) The following bundle incorporates all electrical measures (i.e. lighting) that have a simple payback of less than 10 years: ECM #1: Efficient Indoor Lighting Design (classes, shops and corridors) ECM #2: Efficient Indoor Lighting Design (Gym) ECM #3: Automated Controls in classrooms, shops and corridors ECM #4: Automated Controls in the Gym ECM #5: Efficient Outdoor Lighting Design ECM #6: Efficient Parking Lighting Design The energy cost of the proposed building incorporating this bundle of measures is outlined in the following table and associated graph: Annual Savings Capital Life Payback NPV IRR kwh kw $ Maint $ Cost Expectancy Simple Discounted 257, ,961 2,260 94, $ 66, %