Toward a Sustainable Campus Part II: Improving the Efficiency of the CNS Building Energy Systems Nitin Rajan ‘07 Physics Department Ithaca College

Toward a Sustainable Toward a Sustainable Campus Part II: Campus Part II:

Improving the Efficiency Improving the Efficiency of the CNS Building of the CNS Building

Energy SystemsEnergy SystemsNitin Rajan Nitin Rajan

‘‘0707Physics Department Physics Department

Ithaca CollegeIthaca College

April 2005April 2005 Nitin Rajan, Allison Krasnow, Nitin Rajan, Allison Krasnow, Jon Harrod, Beth ClarkJon Harrod, Beth Clark

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IntroductionIntroduction

To understand the energy use of the CNS To understand the energy use of the CNS building in order to find ways to improve its building in order to find ways to improve its efficiency, thereby decreasing our footprintefficiency, thereby decreasing our footprint

Main Question: Can we make the building Main Question: Can we make the building Kyoto compliant? Can we make the energy Kyoto compliant? Can we make the energy systems more efficient, saving money and systems more efficient, saving money and decreasing our greenhouse gas emissions?decreasing our greenhouse gas emissions?


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Focus: Heating, Ventilation, Focus: Heating, Ventilation, and Air Conditioning (HVAC)and Air Conditioning (HVAC)

Electricity UsageElectricity Usage Heating Fuel UsageHeating Fuel Usage Reduce energy wasteReduce energy waste


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CNS HVAC Energy UseCNS HVAC Energy Use

Heating (Boiler) energy Heating (Boiler) energy

849 million therms (measured)849 million therms (measured) Cooling (Chiller) EnergyCooling (Chiller) Energy

0.3 Million kWh/yr (estimated)0.3 Million kWh/yr (estimated) Ventilation (Fan) EnergyVentilation (Fan) Energy

3 Million kWh/yr (estimated) 3 Million kWh/yr (estimated) Energy ComparisonsEnergy Comparisons

On average a household uses On average a household uses 1000 kWh1000 kWh of of energy per monthenergy per month


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Where is all this energy going?Where is all this energy going?

Boilers and Chillers with huge capacitiesBoilers and Chillers with huge capacities

(5 MW and 2.5 MW respectively)(5 MW and 2.5 MW respectively)


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Air Handler Units (AHU)Air Handler Units (AHU)

The 3 main air handlers togetherThe 3 main air handlers together

supply 150 000 Cubic Feetsupply 150 000 Cubic Feet

of air per minuteof air per minute

Condition and distribute the air coming Condition and distribute the air coming from outside to control inside air qualityfrom outside to control inside air quality

Ventilation and Exhaust Fans to move the Ventilation and Exhaust Fans to move the air through and out of the building air through and out of the building


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What Happens in an Air HandlerWhat Happens in an Air Handler

Pre-Heat

Humidifying

Cooling

AIR INTAKE

To Rooms

Approx. 30% of heating energy




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HVAC SystemHVAC System

AHU 1

HUMIDIFYING

COOLING

OFFICES AND HALLWAYS

PRE-HEAT

HUMIDIFYING

COOLING

AHU 2

LABS

LABFUME HOODS

TO DILUTIONEXHAUST

FANS

AHU 3PRE-HEAT

HUMIDIFYING

COOLING

BUILDINGIN GENERAL

EXHAUST FAN 1 EXHAUST FAN 2 EXHAUST FAN 3 EXHAUST FAN 4

OUTSIDE AIR INTAKE

AIR FROM BUILDING IN

GENERAL

DILUTION PLENUM DILUTION PLENUM DILUTION PLENUM DILUTION PLENUMFROM FUME

HOODS

TO EACH DILUTION PLENUM

EXHAUST EXHAUST EXHAUST EXHAUST

OUTSIDE AIR INTAKE

BY EACH DILUTION PLENUM

RETURN FANFORAHU1


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Fume HoodsFume Hoods


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Fume HoodsFume Hoods

One source of energy waste One source of energy waste identifiedidentified

Around 100 of them in CNS buildingAround 100 of them in CNS building Around 30 were on unnecessarily Around 30 were on unnecessarily

every time we ran a check every time we ran a check


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Energy Consumed by Fume HoodsEnergy Consumed by Fume Hoods

Difficult to determine how long they are Difficult to determine how long they are actually left onactually left on

Weather conditions vary day by dayWeather conditions vary day by day For a fume hood left on UNNECESSARILY For a fume hood left on UNNECESSARILY

for 10 hours on a particularly cold day,for 10 hours on a particularly cold day,

Energy wasted = 100-300 kWhEnergy wasted = 100-300 kWh Which represents 3-9 days of energy use Which represents 3-9 days of energy use

by an average houseby an average house


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Impact of one fume hoodImpact of one fume hood

Here is how much energy they wasteHere is how much energy they waste– Cost in dollars: $7 for that one dayCost in dollars: $7 for that one day

– Cost in GHG emissions: 79 lbs of COCost in GHG emissions: 79 lbs of CO2 2 for for that one daythat one day


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Answer to Main QuestionAnswer to Main Question

Yes, we can work towards making Yes, we can work towards making this building Kyoto compliantthis building Kyoto compliant

Turning off fume hoods represents a Turning off fume hoods represents a huge first step in decreasing COhuge first step in decreasing CO22 emissionemission

x% reduction in annual COx% reduction in annual CO2 2 emission emission just from turning fume hoods offjust from turning fume hoods off


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Next Steps Next Steps

Request to Lab users:Request to Lab users:

Turn the fume hoods off if you do Turn the fume hoods off if you do not need themnot need them

Sensitize other people as to how Sensitize other people as to how wasteful fume hoods can be if not wasteful fume hoods can be if not used wiselyused wisely

More regular checks to be performed More regular checks to be performed Further analysis of the systemFurther analysis of the system

Documents

Toward a Sustainable Campus Part II: Improving the Efficiency of the CNS Building Energy Systems Nitin Rajan ‘07 Physics Department Ithaca College