Presentation Outline. Project Information & Background. Project Information & Background. Project Team. Boston, Massachusetts

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1 Project Team Owner Tufts Boston, Massachusetts Boston, Massachusetts Tufts $65 Million 8, sqft. Project Schedule Began in 995 Delayed from Completed in 23 Architectural Firm Architectural Lead Architect Resources Cambridge Mark Snyder MEP Construction Structural Bard, Rao + Suffolk LeMessurier Athens Construction Consultants Consulting Engineers Scaffolding GGG Scaffolding Material Hoists Services Corp, Julian Crane & Equip. Corp. Plumbing J.C. Higgins Corp, HVAC Limbach, Ceramic Tile, Carpet & Resiliant Masonry Facade Flooring NER Construction Merrimac Tile Co., Management Inc. Inc. Concrete Flatwork Reliable Concrete Above Grade Two Level Penthouse Nine Occupied Floors Below Grade One Basement Level 8,8 ft 2 Basement

2 First Floor Second Third Floors 9,6 ft 2 8,75 ft 2 Classroom First Level Roof Below Lobby Auditorium 8,75 ft 2 Fourth Floor 8,75 ft 2 Fifth Floor Laboratory/Support Laboratory/Support Shell Shell,75 ft 2 Fifth Level Roof Below Sixth Ninth Floors Laboratory/Support Penthouse Non-Conditioned Space 2

3 Air System (4) Identical % OA Air Handlers 7, cfm each Runaround-Coil Heat Recovery 4% Effectivness 3-5 Year Payback Steam Pre-heat Coil Cooling Coil Sound Attenuators (2) 35, cfm Supply Fans Air System AHU 3 & 4 Level 4 Level 9 AHU & 2 Basement Level 3 AHU 3&4 Air Distribution VAV w / Terminal Reheat VCV w / Terminal Reheat Chilled Steam Hot Water System Water System System () Heated 6 psi ton Supply By Steam Centrifugal HX s Chiller () 42 PRV s Loops 8 ton Double-Effect Steam Absorption Use Terminal Reheat Chiller Primary LPS: Perimeter Pre-heat / Secondary Heating Coils & CHP s HX s 2-Cell MPS: Cooling Laboratory Tower Autoclaves HPS: Absorbtion Chiller AHU &2 Depth: Investigate Possibility of Reducing Operating Cost Breadth: Acoustics Reduce Transmission Through Envelope Breadth: Construction Investigate Feasibility of Including BATT in Exterior Wall Composite 3

4 Design Alternatives to be Investigated Introduction of Recirculation Basement Level 3 Total Energy Recovery Basement Level 3 ONLY AHU 3 & 4 Will Be Redesigned AHU & 2 Will Remain the Same Existing Heat Recovery System Air Side Economizer (Enthalpy Controlled) Meet ASHRAE Standard 62-2 Existing Control Design Strategy Simultaneous Heating & Cooling Preheat RedesignSetpoint = 55F Preheat Setpoint = 4F SA Heating Accomplished by Reheat Eliminates Simultaneous Heating and Cooling Expected Benefit Return Damper Ruskin CD6 Low-Leakage Linear Response System Sizing Summary HAP v 4.2 Major system Components Within 8% of Original Design Resizing not Justified 4

5 Annual Operating Cost Summary Component Air System Fans Cooling Heating Existing Design 45,59 75,435 62,259 Recirculation Redesign 45,925 66,453 47, ,982 5,2 Basement Level 3 ONLY AHU 3 & 4 Will Be Redesigned AHU & 2 Will Remain the Same Existing Heat Recovery System in AHU & 2 Pumps 36,668 29,65 7,53 Cooling Tower Fans 8,636 7, HVAC Sub-Total 338,57 36,73 3,454 Lights Electric Equipment 53,356 22,5 58,369 26,39 Expected Benefit Misc. Electric Misc. Fuel Use Non-HVAC Sub-Total 275,45 284,48 Grand Total 63,562 59, 3,454 Semco EXCLU-SIEVE model TE3-7 Max Airflow: 7, cfm AHU Airflow 55, cfm Face Velocity 8 fpm Optimal Velovity Under Design Conditions eff=78% Purge Volume = 36 cfm Purge Index Setting = 4 System Sizing Summary Chiller Plant 8 ton Absorption Chiller Will Remain New 4 ton Centrifugal Chiller Replaces Old 6 ton Unit Trane EarthWise CenTraVac Model Was Selected 3-Stage Pumps SCHP: Aurora 4 Series Annual Operating Cost Summary Component Air System Fans Cooling Heating Pumps Cooling Tower Fans Lights Electric Equipment Misc. Electric Misc. Fuel Use HVAC Sub-Total Non-HVAC Sub-Total Grand Total Existing Design 45,59 75,435 62,259 36,668 8, ,57 53,356 22,5 275,45 63,562 Total Energy Redesign 42,78 65,69 47,49 29,286 7,43 3,75 57,6,78 282, ,953 2,379,266 5,2 7,382,25 36,442 36,442 5

6 Overview Sample First Floor Classroom Interior Noise from Street Traffic Alternate Wall Composite Higher Transmission Loss (TL) Room Criteria (RC) Freq R T S w TL composit e NR (L p ) source (L p ) rec Alternate Composite Same Wall Construction Different Window Assembly Original: /4 /4 glass w/ /2 Airspace New: /4 3/6 glass w 4 Airspace Alternate Composite TL Calculation Identical to previous calculation Redesign Results Freq R T S w TL com NR (L p ) source (L p ) rec Design Comparison Lp (db) Interior Sound Pressure Levels from Street Traffic Existing Design Levels Reccomended RC Rating Levels Redesign Levels Octave Band Center Frequency (Hz) 6

7 Feasibility Study BATT Insulation in Exterior Wall Composite Primary Research HAP Analysis of Operating Cost Reduction Associated First Cost Secondary Research Scheduling Scheduling Time Schedule Placement Site & Construction Requirements Health Considerations & OSHA Potential Component Air System Fans Cooling Heating Pumps Cooling Tower Fans HVAC Sub-Total Lights Electric Equipment Misc. Electric Misc. Fuel Use Non-HVAC Sub-Total Jaharis Existing Building 45,59 75,435 62,259 36,668 8, ,57 53,356 22,5 275,45 Jaharis Building with BATT 44,66 74,944 6,997 36,378 8,4 335,48 53,356 22,5 275, ,677 Grand Total 63,562 63,562 2,677 First Cost Material 6" Thick, R9, 5" Wide BATT Crew Carpenter Daily Output [sqft.] 5 Labor Hours per sqft..7 Scheduling -/2 Weeks Crew of 5 Carpenters 4 Hour Work Week Material Cost [$/sqft.].36 Labor Cost [$/sqft].8 Total sqft of Wall 435 Total Labor Hours Total First Cost for insulation $2,68.9 Payback Period 8 Years Scheduling Health Considerations and OSHA Prerequisites International Agency for Research On Cancer (IARC) Possible Sidewalls, Carcinogen floors, and ceilings have been framed. Doors, windows, subflooring, and sheathing are in place. Consumer Product Safety Commission (CPSC) Plumbing, heating ventilating and air-conditioning work has Only been Carcinogenic completely roughed if Surgically in. Implanted OSHA Cabling and wiring (including telephone and other low-voltage Minimal wiring) Protective have been Gear completely roughed in. Full Clothing Respiration Filter (in some cases) Delivery Schedule Storage Don t Open Until Use Site and Construction Requirements Redesign All Goals Achieved First Operating Graphs Cost for Summary Cost Decision Summary Making Cooling Existing Tower Fans Annual Cost Summary Pumps Monthly Hourly Remote Electric Power Steam Demand Consumption (January) Recirculation Heating Total Energy 4, 4, 4 Compared to Total Energy Cooling Compared to 35, Existing Recirculation Existing Recovery Air System Fans Existing 3, 35, 2, 2 Design Redesign Design Redesign Design Component 25, 3, Electric Chiller, 22, 22, 93, 29, 2, 25, 8 Chilled Water Pumps 8, 5, 2, 6 Pump Motors, 6, 5, 4 Pump Hardware 3,726 3,726,856 2,87 4,, 2 5, RA Damper , 2, Enthalpy Wheels (4) Existing Recirculation Total Energy 224, -224, $338,57 $36,73 $3,75 Grand Total Jan Feb 35,726Mar Apr 36,8 May Jun Jul -455 Aug Sep 327,856 Oct Nov -92,3 Dec Design Option Hour Month Steam Power Electric Consumption Cost Demand (Therm) (kwh) (kw) 2: AM : AM 2: AM 3: AM 4: AM 5: AM 6: AM 7: AM 8: AM 9: AM : AM : AM 2: PM : PM 2: PM 3: PM 4: PM 5: PM 6: PM 7: PM 8: PM 9: PM : PM : PM 7

8 Small First Cost Increase Comparable to Total Energy Recovery Include BATT in Exterior Wall 8-/2 Year Payback Minimal Impact On Schedule (-/2 Weeks) Replace Windows Providing Acceptable First Cost Existing Windows May Cause Distraction Acknowledgments I Would Like To Thank: Jessica Yeager My Family My Project Contacts Dr. Srebric Dr. Mumma Dr. Bahnfleth Dr. Burroughs Dr. Freihaut Prof. Parfitt Paul Bowers (great work!) AE Dept. Faculty & Staff Penn State God AHU 3 & 4 Redesign Enthalpy Wheel Cooling Coil Draw-Thru 8

9 Why not have total energy recovery on all levels? Laboratory Research Infectious Diseases Cholera Cross Contamination Not an Option Internal pore diameter distribution only absorbs molecules less than 2.8 angstroms Cross Contamination <.4% not possible Third Floor S Street w α w S Traffic g α Noise g S f At 5 meters Correct.4 for 72.7 Distance.2 Freq Cylindrical Spreading Room Constant Gypsum Walls Acoustic Ceiling Tile Carpet α f S c α c A = Siαi Octave Band.65 L p Center (% Truck, 9% Freque Car, 35 mph, nncy ncy uncorrected for for disatance) distance) [Hz] α SAB R T Classroom Exterior Wall Section A-Weight 74 8 Exterior Wall Transmission Loss (TL) Structural Composite TL Interpolated Window Composite TL Taken Directly Area Weighted TL Calculated Octave Band Center Frequennc y[hz] Tl wall [Db] TL window [Db] TL composite [Db] τ τ / Sτ + S2τ = log S TL composite 2 2 TL = TL 2 = / Interior Sound Pressure Levels Calculated Using Noise Reduction (NR) Equations NR = ( L p ) ( L ) source p rec R T NR = TL + log Sw Freq R T S w TL composite NR (L p ) source (L p ) rec

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