rowland hall hvac retrofit

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Rowland Hall HVAC Retrofit

Rowland Hall HVAC Retrofit

Best Practice Award in HVAC Design and Retrofit 2011

Matt Gudorf Campus Energy Manager

Nick Kimbell Project Manager

OverviewBuilding DescriptionProject Scope of WorkLab Air Control Valve InstallationNew Method for Occupancy Control of Office and Support SpaceSuccessfully completing a UC Investor Owned Utility partnership projectEconomic and Environmental AnalysisRowland HallRowland Hall is a 6-story, approximately 232,000 square-foot, university laboratory building constructed in 1968. With a seismic retrofit in 2007.The building occupancy consists primarily of research laboratories, teaching laboratories, classrooms, and officesFume Hood intensive with high hood density in multiple labs, there are 168 fume hoods in the building.100% Outside Air, Dual DuctSecond Largest Campus Energy Demand

Rowland HallHVAC Retrofit ProjectAsbestos AbatementSupply air duct cleaningConstant Air Volume to Variable Air Volume Pneumatic to Direct Digital ControlStatic Pressure Control Damper InstallationOccupancy control of HVAC to offices at the zone levelLab Air Control Valve UpgradeFume hood upgradesSash Position SensorsFume hood monitoring and alarm panel upgradeZone Presence Sensor installationTest and BalanceAsbestos Abatement Keys to SuccessContractor provided with detailed assessment prior to bid

Contractor required to carry the abatement subcontract to eliminate the possibility of the University being caught in the middle

University EH&S personnel monitor all abatement activities

Color Coded Assessment When building load varies,shouldnt the HVAC system follow?Constant Air Volume Supply and Exhaust flow rate remains the same independent of:Fume hood sash positionThermal demandOccupancy

Variable Air Volume Supply and Exhaust changes depending on:Fume hood sash positionThermal DemandOccupancy

Constant Air Volume to Variable Air VolumeConstantVentilation Rate (CFM)VAV270,000 CFM192,857 CFMSavings of77,500 CFM

Typical Lab Prior to RetrofitConstant Volume Phoenix ValvesConstant Volume Dual Duct Mixing Boxes

Typical Lab Post RetrofitVariable Volume Phoenix ValvesMixing Boxes for temperature control and Phoenix Valves for flow control

New Mixing BoxesDual Duct to Phoenix Valve Connection for Lab Supply Air and Proper Set UPDuct static pressure must be equal to prevent backflowTemperature control of supply airControl of flow (CFM) of supply airZone Presence Sensors

Hood mounted occupancy controls provide savings when sashes are left open and unoccupiedCAV to VAV Lesson LearnedStatic Pressure to lab air control valves is higher than what should be supplied to a mixing box for an office.

Supply ductHot and Cold Deck Supply to FloorLab Supply PlenumOffice Supply Plenum1.5 Static1.5 Static1.5 StaticPressure Requirements for Lab Air Control Valves and VAV Offices Would Result in Excessive Duct NoiseHot and Cold Deck Supply to FloorLab Supply PlenumOffice Supply Plenum1.5 Static.75 Static1.5 Static

Damper Position signal is sent to office exhaust valve to adjust office exhaust rateStatic Pressure Control Added toeach floorPneumatic Controlto Direct Digital ControlDirect Digital ControlsDo not require frequent calibration.Can perform complex sequences.Can receive instructions from a master computer.Can transmit to a master computer information such as damper position, room temperature, supply air quantity, and supply air temperature. Additional Benefits of Direct Digital Controls in Rowland HallAllow for occupancy based control of office spacesProvide static pressure reset data

Occupancy Based VAV for OfficesA New ApproachGoal: Save energy during unoccupied periods

Review of previous best practice

Rowland Halls approach

Occupied Mode

TECTo exhaust plenum

Unoccupied Mode

Previous Best Practice During periods of non occupancy temperature dead band would be increased to a wide range If Unoccupied Heat to 60 Cool to 80TEC

Unoccupied Mode

Previous Best Practice Room temperature would move to one extreme or the other and take too long to normalize when occupants returned to the space8060TimeTECWhen the room is unoccupied increase the dead band for temperature control to heat to 60 cool to 80.

Unoccupied Mode

New method developed for Rowland Hall During periods of non occupancyMixing Boxes are commanded to 3 modes

> 68 Mode 169-73 Mode 2< 74 Mode 3TECUnoccupied Mode 1Thermostat Less than 68F

Hot deck commanded to 10% openAir flow is not measured and no adjustments are made for duct pressure changes. Unoccupied Mode 2Thermostat Between 68-74 F

Hot deck commanded to 5% openAir flow is not measured and no adjustments are made for duct pressure changes. Cold deck commanded to 5% openUnoccupied Mode 3Thermostat Greater than 74F

Cold deck commanded to 10% openAir flow is not measured and no adjustments are made for duct pressure changes. New Approach Provides Energy Savings and Improves Occupant Comfort8060TimeSEP Partnership StepsImplementation CostEnergy and Environmental SavingsPaybackProject budget: $4,100,000Annual energy savings (kWh, therms): 3,486,767 kWh with a 640 kW demand reduction, reduced natural gas use by 98,000 thermsAnnual cost savings: $442,550 ($0.105 kWh demand charges included, $0.78 Therm)Annual cost to repay the bond: $306,564CO2 emissions by 1,660 metric tonsIncentive payment from the IOUs totaling $922,000Contribution to Sustainability GoalsThank you for your time!QUESTIONS??This concludes The American Institute of Architects Continuing Education Systems Program