Meet the Problem • Students were introduced to the problem with letters from ComEd and ARAMARK district 204’s energy management services.
The ProblemNeuqua Valley’sMonthly Electric Bill $50,380 per month
Understanding the Problem• Process of listing what they already knew and what needed to be determined.• Students created a statement to reflect what their role was in the process and what they wanted to accomplish.
Community Partners• ComEd: Mr. Mark Wizniak- senior Energy Specialist• ARAMARK: Mr Mike Paperella- energy Manager Dist 204• ARAMARK: Mr. Leonard Sharum- building manager• OSRAM Sylvania: Ms Rose Lenchner- Industrial/Commercial Senior Sales• Neuqua Valley: Mr Mark Kolkman assistant principal- operations
Energy Audit• Survey conducted throughout the building• Students using ipads and journals, documented how electrical energy was being used in lighting and motors
Tools of the Audit Light meterKill a watt meter Laser measuring tape
Post AuditIdentified areas of energy reduction or energy inefficiencyStudents organized themselves into teams of 2 or 3 to attack one identified area.Students reported back findings and created this presentation.
Identified Possible Opportunities• Classroom lighting• Bathrooms• Weight room and Gym• Computers• Plug Loads• Motors
Classroom Lighting• Light level intensity measurements indicated that each classroom was overlight• The Advanced Energy Design Guide for K-12 School Buildings, developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) recommends 30-70 footcandles of illumination
Classroom lighting• Light levels were measured to 60-70 foot- candles when all the switches in the classroom were on.
Classroom Lighting: Solution• By ONLY turning on one switch, light levels were still at 50 footcandles.• Energy usage could be reduced by one third in each classroom
Classroom Lighting• Based on 60 T-8, 28Watt light bulbs and roughly 110 classrooms.• Operating for 12 hours a day and 177 days in the school year• Projected savings: 131,000 KWhr @$0.10/KWhr Savings of $13,000
Classroom Lighting• Solution: Ad Campaign to educate staff and students of the savings. – Switch plate stickers, poster
Bathrooms • Lights are on at least 18 hours/day • Bathrooms are only occupied a total of 4 hours/day
Current State Location #bathrooms #bulbs Kw/bathroom Aud. 4 20 0.560 Lobby Hallways 10 12 0.336 Commons 2 21 0.588 Gym Hall 2 12 0.336 Total 18 266 7.448Estimated hours of usage = 18 hours a day = 540 hours amonth
Current UsageLocation KWhr/bathroomAuditorium Lobby 302Hallways 181Commons 318Gym Hall 181Total 983Total Operating Cost $323.75
Proposed Savings with Motion Sensors Location KWhr/bathroom Auditorium Lobby 67 Hallways 40 Commons 71 Gym Hall 40 Total 218 Total Operating Cost $71.51 Estimated hours of usage = 4 hours a day = 120 hours a month
Return on InvestmentInitial Cost With Labor $6,473Savings per month $252.25# months to cover 25.66 monthsReturn on Investment 2.14 years
Weight Room• Current lighting: T-12• Proposed lighting: T-8
Cost Savings 40000 35000 Cumulative Cost 30000 25000 20000 T12 15000 T8 10000 5000 0 0 2 4 6 8 10 12 YearsReturn on Investment reached at less than 5 years
Gym • Current lighting: HID • Proposed lighting: T-5HID fixtures in Gym Proposed T5 fixture
Cost Savings 250000 200000Cumulative Cost 150000 HID Retrofit 100000 T-5 H.O. 50000 0 0 2 4 6 8 10 12 Years Return on Investment reached in just over 4 years
Computers Currently 1100 computers in use• 850 are old CRT type •250 are new LCD type 5.2W phantom load No phantom load 141W when on 89W when on
Current Configuration850 Old Computers 250 New ComputersON Phantom Load ON(141W x 12hr + 5.2W x 12hrs) x850 + 89W x 10hrs x250 = 1714 KWhr/day x 177 days/school year 303,378 KWhr/year Total cost at $0.10/KWhr $30,378
Current Computers with Shutdown Software850 Old 250 New computersComputers Phantom Load(141W x 10hrs + 5.2W x 14hrs) x850 + 89W x 10hrs x250 =1482 KWhr/day x 177 days /school year 262,314 KWhr/year Total cost at $0.10/KWhr $26,231
Solution: New Computers with Shutdown Software1100 New Computers= 89W x 10 hrs x 1100 x 177 days/school year 173,283 KWhr/year Total cost at $0.10/KWhr $17,328 Total Projected Energy Savings: 130,095 KWhr/year
Phantom Loads• Electricity is used even when electrical device is not in use
Phantom Loads KWhr Used / Cost Per Item Number of Units Year Year Survey of ElectricalTV 21 4200 551.88Projector 7 3150 413.91 devices in BuildingPrinters 39 956 125.57Fridge 7 5740 754.25Microwaves 9 900 177.39 Total Phantom Load:LCD computer 21 2100 551.88 21,318 KWhr/yearSmartboards 2 180 41.06Dishwasher 1 170 5.58VCR 1 40 7.88 Total costFreezer 1 790 51.9 @$0.10/KWhrOverhead 1 3092 414.33TV 21 4200 551.88 $2,132 /yearProjector 7 3150 413.91
Phantom Loads• Out of TV, overhead, VCR and projector, just use one, and get rid of the rest; projector seems the most reasonable to use• For fridges, freezers, microwaves, dishwashers, and other appliances, purchase energy-efficient models• Smart powerstrips• For printers, scanners, and copy machines, buy models where all are combined into one unit.• Unplug TV, overhead, VCR, projector, computers, scanners, and copy machines when the school day ends.
Phantom Loads• 30 % energy reduction• Energy Savings of 6,396 KWhr/year• Cost Savings: $639.60
Cafeteria Lighting • About 100 lights total • 87 CFLs • 13 T-8 bulbs
Overview•Summary: The VariableFrequencyDrive, belonging to a class ofelectric variable speed drives, acts as the brains of a motorthat converts electrical power, which is at a fixed voltage andfrequency, to variable voltage and frequency•Purpose: To control the output speed of a motor byconsuming only the power that is needed. This reduces energyusage by almost 2/3 VFD