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1 Jayme Antolik Architectural Engineering Mechanical Option Senior Thesis 2006
2 Presentation Outline
3 Reason for Renovations School District Administration Relocation Previous to move Originally in 4 offices in different locations throughout Philadelphia Working environment Public accessibility After move One centrally located site Better working environment Easier public accessibility
4 Building Site X-Axis: Broad and Market Streets Nearly all of Philadelphia s s commercial office space 42% of center city s s jobs 7 colleges draw 34,000 students 21% of downtown s s jobs
5 Building History Existing printing facility for the Inquirer and Daily News 848,000 square feet with a 161,000 SF building footprint 5 stories above ground Large floor-to to-floor heights Large live load structural capacity
6 Design Team Architect: Hooper Shiles Architects, Wayne, PA Mechanical Engineers: Cannon Design, NY, NY Structural Engineers: Thorton Tomasetti Group, Newark, NJ CM: Turner Construction Company, Construction Dates: December 2004 April 2006
7 New Architectural Features 3 story atrium Broad Street and 15 th Street entrances New passenger and freight elevators
8 Existing Mechanical System Airside Variable Air Volume with Parallel Fan Powered Boxes 17 self contained packaged direct expansion (DX) air handling units located within the building core 80 to 100 tons per unit 25,000 to 32,000 CFM per unit 68 kw reheat coil per unit Parallel fan powered boxes utilize electric heating coils 50 total at 19 kw per box Ducted supply/plenum return Outdoor and return air mix within the core mechanical rooms
9 Existing Mechanical System Waterside 1500 ton 2-celled 2 cooling tower serves the DX units with condenser water GPM 250 HP condenser water pumps (one for back-up)
10 Design focus Alternative Mechanical Systems Office space Floors 1, 2, 3, and 5 425,000 SF Objectives Save yearly energy consumption/cost Reduce initial cost Reduce emissions Save lost rentable space
11 Airside Comparison Alternative Mechanical Systems Existing VAV system Dedicated outdoor air system with parallel VAV system Dedicated outdoor air system with parallel radiant system Waterside Comparison Existing condenser water supply to DX units/electric heating Central Chilled Water and Central Hot Water Plant
12 Purpose Dedicated Outdoor Air System (DOAS) Supply ventilation requirement (Standard 62.1) Remove latent load from space Heat Recovery Enthalpy wheel: Used to recover heat from the exhaust stream for conditioning of outdoor air Summer: Hot outdoor air is cooled and dehumidified Winter: Cold outdoor air is heated and humidified Benefits Reduces equipment load
13 2 DOAS Air Handlers DOAS/Parallel System Supply low temperature air (45F) via high induction diffusers North DOAS 76 tons CFM South DOAS 125 tons CFM Parallel System VAV or Radiant 749 tons
14 Radiant Cooling Panels Absorption capacity per panel: 292 Btu/hr Radiant Parallel System Room DBT Mean Water Temp 17 panels per circuit Flow per circuit: 2 GPM Absorption capacity per circuit: 5000 Btu/hr Flow rate Assumed temperature rise 23.8 PD per circuit 110 circuits per space Sterling Radiant Baseboard Heating Perimeter heating load: 3241 MBH 125 MBH per space
15 Airside Results VAV vs. DOAS/Parallel Equipment load reduction 27.5% VAV system 1310 tons DOAS/Parallel system 950 tons
16 Purpose Central Chilled Water Plant Supply chilled water to cooling coils in air handling units Supply chilled water to radiant cooling panels Equipment 2 - electric two-stage centrifugal water-cooled chillers Piped in parallel Variable-primary 2 chilled water pumps 1 to head each chiller Benefits Reduces total cooling energy consumption
17 Central Hot Water Plant Purpose Supply hot water to heating coils in air handling units Supply hot water to heating coils in VAV boxes Supply hot water to radiant baseboard heaters Equipment 1 gas-fired hot water boiler Efficiency: 83.3% Load: 7000 MBH Capacity: 8400 MBH Benefits Reduces total heating energy consumption Existing gas service at Buttonwood Street
18 Energy Consumption Results System 1: Existing VAV DX & electric coils System 2: VAV system CHW & HW System 3: DOAS and parallel VAV DX & electric coils System 4: DOAS and parallel VAV CHW & HW System 5: DOAS/Radiant CHW & HW
19 Yearly Operating Cost System 1: Existing VAV DX & electric coils System 2: VAV system CHW & HW System 3: DOAS and parallel VAV DX & electric coils System 4: DOAS and parallel VAV CHW & HW System 5: DOAS/Radiant CHW & HW
20 Cost Summary
21 Structural Study Central Water Plant Existing structural system 5 inch concrete slab on metal deck Steel girders and columns Designed for a live load of 125 PSF Existing modifications Column extensions to carry weight of cooling tower for existing VAV-DX system 45,000 lbs New modifications Column extensions to carry weight of new central water plant 140,000 lbs Designed live load: 100 PSF (corridors) Designed dead load: 75 PSF
22 Structural Design Original Columns Column Extensions W 12 x 40 Frame for Columns HSS 20 & HSS 12 Frame for Equipment HSS 20 & HSS 18 Mechanical Equipment Chillers & Boiler
23 Structural Model Top Frame SAP model Point loads 2, 3, 6, 7: 1 KIP Point loads 1, 4, 5, 8: 136 KIP Bottom Frame RAM model Line load: 15 KIP/LF Existing top column 12 x 40 Passes Existing bottom column 12 x 72 Passes No major structural modifications
24 Sequence Schedule Interior Equipment Installation Similar sized spaces 25,000 SF Plenty of crew work space Equal amounts of material installed in each space Adequate laydown area Sufficient freight elevator capacity 20,000 lbs
25 Sequence Schedule Interior Equipment Installation VAV Critical activity: Ductwork Weight: 500,000 lbs Daily output: lbs Installation time: 35 days DOAS/Radiant Critical activity: Radiant Panels Pipe length: ft Daily output: 5250 ft Installation time: 15 days
26 Sequence Schedule 5 Activities 1. Interior Walls 2. Plumbing 3. Ductwork/Radiant Panels Interior Equipment Installation 4. Fire Protection 5. Electrical
27 Sequence Schedule Outdoor Equipment Installation Structural Modifications New roof column extensions No major construction issues New roof framing Mechanical Equipment Chillers & Boiler Location: Roof Required Construction Equipment Crane Location: Turner Construction parking lot Neighborhood nuisance? 15 Street closed for 1-2 days Commuter traffic rerouted
28 IF an owner chooses chilled water plant Choose DOAS/Radiant System Lowest energy consumption Smallest operating cost Lowest emissions Decrease in mechanical room space No major structural modifications No major construction issues
29 Thank You Penn State Architectural Engineering Mechanical Faculty Especially my advisor: Jae-Weon Jeong Classmates Especially Evan, Jess, Jenny, Yulien,, Lourdes, Bryan Mike Rush at Cannon Design Bill Harrington at Turner Construction
30 Questions?
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