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The Hearst Tower 959 Eighth Avenue New York, NY Jessica Lucas Mechanical Option.

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Presentation on theme: "The Hearst Tower 959 Eighth Avenue New York, NY Jessica Lucas Mechanical Option."— Presentation transcript:

1 The Hearst Tower 959 Eighth Avenue New York, NY Jessica Lucas Mechanical Option

2 The Hearst Tower New York, NY Introduction  Background  Current System  Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Presentation Outline Jessica Lucas Mechanical Option Background Current System Proposed System Cost Analysis Electrical Breadth Structural Breadth Conclusions

3 The Hearst Tower New York, NY Introduction Background  Current System  Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Site and Location Jessica Lucas Mechanical Option Located along 8th Avenue between 56th & 57th Street in Midtown Manhattan Constructed through the center of the original Hearst Headquarters (1928) Landmark building will be hollowed with new Tower constructed through center

4 The Hearst Tower New York, NY Introduction Background  Current System  Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Project Team Building Owner: Hearst Corporation Architect: Foster and Partners Associate Architect: Adamson Associates MEP: Flack+Kurtz CM: Turner Construction Project Team Building Owner: Hearst Corporation Architect: Foster and Partners Associate Architect: Adamson Associates MEP: Flack+Kurtz CM: Turner Construction Jessica Lucas Mechanical Option

5 The Hearst Tower New York, NY Introduction Background  Current System  Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Size and Architecture Jessica Lucas Mechanical Option 42 stories 856,000 SF 2000 Hearst Employees Most notable features: Diagrid Facade LEED Gold certification Architectural Program Open Office Auditorium Test Kitchens Television Studio

6 The Hearst Tower New York, NY Introduction Background Current System  Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Existing Mechanical System Jessica Lucas Mechanical Option Central Chilled Water Plant serving a low temperature Variable Air Volume system Waterside System ton cooling towers on roof level ton & ton electric chillers in basement chiller plant Airside System 4-110,000 CFM AHU’s, serve office tower Indoor Design Conditions 75F for cooling/50% RH cooling 70F for heating Air supplied to spaces at 45F

7 The Hearst Tower New York, NY Introduction Background Current System Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Proposed Mechanical System: Combining Steam Driven Absorption Cooling with a Dedicated Outdoor Air/ Radiant Floor System Proposed Mechanical System: Combining Steam Driven Absorption Cooling with a Dedicated Outdoor Air/ Radiant Floor System Jessica Lucas Mechanical Option Replace electric chillers with double effect steam driven absorption Replace the central VAV AHU’s with dedicated outdoor air (DOAS) units Install radiant floors to parallel DOAS for both heating & cooling

8 The Hearst Tower New York, NY Introduction Background Current System Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Goals of Proposed System Ensure ASHRAE Std compliance Obtain the LEED point for IAQ Lessen the Tower’s dependence on an overextended electric grid Lower annual operating cost Meet the original criteria to create a reliable Class “A” office building Goals of Proposed System Ensure ASHRAE Std compliance Obtain the LEED point for IAQ Lessen the Tower’s dependence on an overextended electric grid Lower annual operating cost Meet the original criteria to create a reliable Class “A” office building Jessica Lucas Mechanical Option

9 The Hearst Tower New York, NY Introduction Background Current System Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Proposed Mechanical System: Dedicated Outdoor Air System (DOAS) Proposed Mechanical System: Dedicated Outdoor Air System (DOAS) Jessica Lucas Mechanical Option What is DOAS? 100% OA unit based on ASHRAE Std.62.1 Decouples Sensible & Latent Loads Utilizes Energy Recovery DOAS for Hearst: Std % OA for IAQ LEED point Utilize an Enthalpy Wheel for total energy recovery Maintain 45F supply air temperature

10 The Hearst Tower New York, NY Introduction Background Current System Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Proposed Mechanical System: Jessica Lucas Mechanical Option The resulting DOAS Design: 3-40,000 CFM Semco units with a molecular sieve desiccant coated enthalpy wheel Chiller plant downsized by 30% Cooling coil load decreased from 44 tons to 10.5 tons Supply Air at 45F and saturation

11 The Hearst Tower New York, NY Introduction Background Current System Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Proposed Mechanical System: Radiant Floor Heating and Cooling Proposed Mechanical System: Radiant Floor Heating and Cooling Jessica Lucas Mechanical Option Optimize layout based on daylighting study using AGI32 software

12 The Hearst Tower New York, NY Introduction Background Current System Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Proposed Mechanical System: Absorption Chillers Proposed Mechanical System: Absorption Chillers Jessica Lucas Mechanical Option ton Double-effect chillers arranged in parallel Lithium Bromide/Water- no CFC’s or HCFC’s New chiller plant requires 60 kW of electric input, compared to 1,941 kW used in the electric chiller plant Con Edison offers incentives for steam driven cooling during the cooling season

13 The Hearst Tower New York, NY Introduction Background Current System Proposed System  Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Proposed Mechanical System: Additional Alternative Proposed Mechanical System: Additional Alternative Jessica Lucas Mechanical Option Can I save even more with an Electric Chiller Plant w/DOAS System? Still 30% reduction in chiller plant size Still only minimum CFM Higher COP with vapor compression cycle

14 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Proposed Mechanical System: Cost Analysis Proposed Mechanical System: Cost Analysis Jessica Lucas Mechanical Option Electric w/VAV Electric w/DOAS Absorption w/DOAS Total Electricity $93.1 M$41.2 M$33.9 M Total Steam $31 M$29.4 M$39.4 M Total O&M $25.6 M$14.5 M$15.9 M 20 year LCC $156.4 M$93.4 M$98.8 M

15 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis  Electrical Breadth  Structural Breadth  Conclusions Proposed Mechanical System: Mechanical Summary Proposed Mechanical System: Mechanical Summary Jessica Lucas Mechanical Option Electric/DOAS Lowest LCC Lowest Operating Cost Higher COP However… Still dependent on electric grid Black-outs = diminished reliability Recommendation: Absorption/DOAS Radiant

16 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth  Structural Breadth  Conclusions Electrical System Breadth Jessica Lucas Mechanical Option Current Electrical System: amp service take-offs Each takeoff is served by amp service switch Each takeoff provides 480/277 V 3 phase service from primary transformers Daylighting & Occupancy sensors used throughout for energy conservation High efficiency ballasts, helped obtain rebates from NYSERDA

17 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth  Structural Breadth  Conclusions Electrical System Breadth Jessica Lucas Mechanical Option Existing Chiller Plant Chiller 1&2: 2000 A fuses, 6 sets of MCM with 1-#3/0 ground in 3”conduit Chiller 3: 800 A fuse, 2 sets of MCM with 1-#2/0 ground in 3.5” conduit Cost of wiring & conduit: $932.00/LF New Plant Chiller 1,2,3: 40 A fuses, 1 set of 3-#6 with 1-#10 ground in 1”conduit Cost of wiring & conduit: $46.80/LF

18 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth  Structural Breadth  Conclusions Electrical System Breadth Jessica Lucas Mechanical Option Existing VAV System 8 supply fans- 124 FLA 4 return fans- 65 FLA MCC total connected load of 1,697 FLA Proposed DOAS System 3 supply fans- 77 FLA 3 return fans- 65 FLA MCC total connected load of 632 FLA

19 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth  Structural Breadth  Conclusions Electrical System Breadth: Conclusions Electrical System Breadth: Conclusions Jessica Lucas Mechanical Option Downsizing equipment results in: First cost savings for wire & conduits Decreased switch sizes Increased distribution board space Allows for easier installation

20 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth Structural Breadth  Conclusions Structural System Breadth: Current System Half of the foundation is supported by spread footings, half by caissons Primary lateral support provided by the perimeter Diagrid Secondary lateral system defined by braced frame at the service core Structure below 10 th floor uses a mega-column system to support a large unbraced height Structural System Breadth: Current System Half of the foundation is supported by spread footings, half by caissons Primary lateral support provided by the perimeter Diagrid Secondary lateral system defined by braced frame at the service core Structure below 10 th floor uses a mega-column system to support a large unbraced height Jessica Lucas Mechanical Option

21 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth Structural Breadth  Conclusions Structural System Breadth: Effect of Radiant Floors Structural System Breadth: Effect of Radiant Floors Jessica Lucas Mechanical Option International Fire Code hour fire rating Vulcraft Deck 6” slab Radiant tubes 1.5” concrete cover Check deck, beams, girders with additional concrete load LRFD Manual example for Composite W-shape flexural member design (unshored construction)

22 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth Structural Breadth  Conclusions Structural System Breadth: Conclusion Allowable Shear Stud Capacity greater than Maximum shear under applied loading Vu < ΣQn i.e k < 451 k Allowable Flexural Capacity exceeds Maximum moment under the applied factored loading Mu < ФMn i.e. 428 ft-k < 450 ft-k No changes needed to member sizes! Structural System Breadth: Conclusion Allowable Shear Stud Capacity greater than Maximum shear under applied loading Vu < ΣQn i.e k < 451 k Allowable Flexural Capacity exceeds Maximum moment under the applied factored loading Mu < ФMn i.e. 428 ft-k < 450 ft-k No changes needed to member sizes! Jessica Lucas Mechanical Option

23 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth Structural Breadth  Conclusions Conclusions Jessica Lucas Mechanical Option Proposed mechanical system satisfied criteria set forth at the beginning of the design process: Lower annual operating costs Obtain LEED point for IAQ Lessen dependence on electric grid Increase reliability Maintain Class “A” market status Positively impact electrical system by lowering first cost & allowing for easier installation No nominal impact on Structural system

24 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth Structural Breadth Conclusions Acknowledgements Jessica Lucas Mechanical Option A huge Thank You to: JJ, Dr. Freihaut, Dr. Bahnfleth, Dr. Mumma, Dr. Srebric and the rest of the AE Faculty. My fellow classmates especially Jenny, Jayme, Yulien, Dave, Bryan, and Adam. Paul Reitz of Flack+Kurtz

25 The Hearst Tower New York, NY Introduction Background Current System Proposed System Cost Analysis Electrical Breadth Structural Breadth Conclusions Questions?? Jessica Lucas Mechanical Option


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