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DOUG BOSWELL MECHANICAL OPTION APRIL 16, 2008 Temple University Tyler School of Art.

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Presentation on theme: "DOUG BOSWELL MECHANICAL OPTION APRIL 16, 2008 Temple University Tyler School of Art."— Presentation transcript:

1 DOUG BOSWELL MECHANICAL OPTION APRIL 16, 2008 Temple University Tyler School of Art

2 Presentation Outline Project Overview Existing Mechanical Systems Proposed Redesign Annual Energy Cost and Consumption Electrical Considerations Mechanical Construction Cost Life Cycle Cost Analysis Conclusions

3 Project Overview Building Owner: Temple University Building Location: Philadelphia, PA  Campus moving from Elkins Park, PA to Main Campus Art Education  Building divided by Departments 234,000 SF $75 Million Construction Complete January 2009

4 Tyler School of Art o Designed by Carlos Jimenez o School Features 160,000 SF of Teaching Space o Building Includes Studio, Galleries, Administration, and Workshops o Departments Include Painting, Metals, Printmaking, Sculpture, etc. o 40% More SF than Elkins Park Campus View from Main Lobby

5 Existing Mechanical Conditions Campus Chiller/Boiler Plant  40,000 lbs/hr of HPS supplied at 240°F HPS Converted to LPS  LPS used for preheat coils, AHUs, and heat exchangers LPS Converted to Hot Water Heat through Heat Exchanger  Hot Water System serves terminal heating equipment  Hot Water Supply: 180°F  Hot Water Return: 160°F

6 Existing Mechanical Conditions Served by 3 RTUs & 4 basement AHUs  2 RTUs & 2 AHUs are VAV Reheat  1 RTU & 2 AHUs are CAV Reheat  Units Range 35,000-62,000 CFM  CAVR units are 100% OA SpaceHVAC System Administration & OfficeVariable Air Volume Reheat (VAVR) Classroom SpacesVariable Air Volume Reheat (VAVR) Conference & PresentationVariable Air Volume Reheat (VAVR) Workshop & Studio AreasConstant Air Volume Reheat (CAVR) Layout of Units

7 VAV/CAV Advantages Low First Cost Low Maintenance Simple & Inexpensive Controls Flexibility

8 VAV/CAV Disadvantages High Energy Consumption Inadequate Airflow Single Box Serves Multiple Spaces Large Ductwork

9 Objectives Improve Energy Consumption Increase Energy Efficiency Reduce Outdoor Air Load Required Evaluate Long Term Economic Feasibility

10 Redesign Summary Replace VAV/CAV units with Dedicated Outdoor Air (DOAS) Units Parallel Sensible System: Chilled Beams

11 Dedicated Outdoor Air System (DOAS) Separates Latent from Sensible Loads Energy Savings with Decreased Fan and Chiller Energy Paired with Parallel Sensible System Indoor Air Quality Thermal Comfort

12 Energy Recovery (Enthalpy Wheel) Included as Part of DOAS Advantages Of Enthalpy Wheel  Reduce Cooling/Heating Loads  Downsize Equipment/Ductwork  Large Ventilation Disadvantages  First Cost  Fan Energy  Required Air Filtration Enthalpy Wheel

13 Chilled Beams Active Beams Mix Supply Air with Existing Air Passive Beams Use Natural Convection  Warm Air Rises While Cool Air Falls Active Chilled Beam Passive Chilled Beam

14 Chilled Beams Advantages  Pump Energy instead of Fan Energy  Mechanical System and Duct Reductions  Higher Air Temperature Because Direct Cooling Disadvantages  Cost  Condensation  High Sensible Loads  U.S. Availability  Lighting Coordination

15 DOAS Ventilation Air Summary DOAS Supply Air Square Feet ServedCFM/FT 2 AHU-1/225,33639,7860.637 AHU-3/431,28467,3330.465 RTU-119,72730,7570.641 RTU-28,12721,7490.374 RTU-38,42320,4100.413 Total CFM92,897 Total CFM Total % Reduction Original Design352,00073 Redesign92,897 DOAS Ventilation Air Required Supply Air Reduction

16 DOAS System Layout Total CFMAreas Served DOAS-122,213RTU-2, RTU-3, AHU-3/4 DOAS-222,733AHU-3/4 DOAS-325,336AHU-1/2 DOAS-422,615RTU-1, AHU-3/4 DOAS Units Required

17 Chilled Beams Required Halton, Inc. Chilled Beams Used Heating/Cooling Wide Occupancy Ranges High Sensible Loads FloorMBH Chilled Beams Required 1st930.2233 2nd1344.4336 3rd418.8105 Basement310.378 Total3003.7751 Halton CCE Active Chilled Beam Chilled Beams Required

18 Annual Existing Energy Cost Annual Operating Cost of $500,428.00 TYLER SCHOOL ORGINAL DESIGN Annual Revised CostTotal Cost (%) Air System Fans$135,442.0027.1 Cooling$76,924.0015.4 Heating$50,372.0010.1 Pumps$26,110.005.2 Cooling Tower Fans$32,436.006.5 HVAC Sub-Total$321,285.0064.2 Lights$107,486.0021.5 Electric Equipment$71,657.0014.3 Non-HVAC Total$179,143.0035.8 TOTAL$500,428.00100

19 Annual Redesigned Energy Cost DOAS Annual Revised Cost Total Cost (%) Air System Fans$42,329.0024 Cooling$33,614.0019.1 Heating$69,548.0039.5 Pumps$13,493.007.7 Cooling Tower Fans$17,259.009.8 TOTAL$176,243.00100 CHIILLED BEAMS Air System Fans$19,591.0012.2 Cooling$23,469.0014.7 Heating$18,153.0011.3 Pumps$13,269.008.3 Cooling Tower Fans$12,408.007.7 HVAC Sub-Total$86,889.0054.3 Lights$43,941.0027.4 Electric Equipment$29,294.0018.3 Non-HVAC$73,235.0045.7 TOTAL$160.124.00100 ANNUAL ENERGY COST Existing$500,428.00 Redesigned$336,367.00 Annual Energy Cost Savings of $164,061.00

20 Existing System Redesigned System ORIGINAL Annual Energy Consumption$/yr HVAC Electric (kWh)3,764,578$271,240.00 Natural Gas (Therm)38,006$50,044.00 Non HVAC Electric (kWh)2,485,585$179,144.00 TOTAL ELECTRIC6,250,163$500,428.00 DOAS Annual Energy Consumption$/yr Electric (kWh)2,213,175$161,739.00 Natural Gas (Therm)47,034$14,504.00 CHILLED BEAMS HVAC Electric (kWh)941,153$68,854.00 Natural Gas (Therm)13,270$18,035.00 Non HVAC Electric (kWh)997,188$73,235.00 TOTAL ELECTRIC1,938,341$142,089.00 TOTAL COST $336,367.00 Annual Energy Consumption

21 Reduction of Approximately 33% kWh ANNUAL ENERGY CONSUMPTION Existing SystemRedesign Electric (kWh)6,250,1634,151,516 Natural Gas (Therm)38,00660,304

22 Electrical Considerations PROTECTIVE DEVICEFEEDER DESCRIPTI ON CB FRAMENO.TRIPNO.WIRE CONDUCTOR SIZE GROUND SIZE CONDUIT SIZE (AMPS) POL ES (AM PS)SETSQTY./SET (AWG OR KCMIL)PER SET SERVICE EQUIPMENT REMOVED 2253200133/062AHU-1 2253200133/062AHU-2 2503 13 42 1/2AHU-3 2503 13 42 1/2AHU-4 2253200143/062RTU-1 225312514161 1/2RTU-1 2253200133/062RTU-2 1003 13181 1/2RTU-2 225312513161 1/2RTU-3 1003 13181 1/2RTU-3 EQUIPMENT ADDED 5034513108 1/2DOAS-1 4033513108 1/2DOAS-2 5034513108 1/2DOAS-2 4033513108 1/2DOAS-2 5034513108 1/2DOAS-3 4033513108 1/2DOAS-3 5034513108 1/2DOAS-4 4033513108 1/2DOAS-4 EXISTING SYSTEM COST CONDUCTOR$1,792.95 GROUND$339.73 CONDUIT$4,610.40 TOTAL COST$6,743.08 DOAS REDESIGN CONDUCTOR$228.16 GROUND$200.88 CONDUIT$1,076.32 TOTAL COST$1505.36 Potential Electrical Savings$5,237.72

23 Electrical Considerations Voltage Drop CONDUCTOR SIZEFT Voltage DropVD% Less Than SERVICE(AWG OR KCMIL)WIRE Amp sPer 1000 Amp-FtL to LVD3% DOAS-11052501.1034.961.03Yes DOAS-11052401.1033.970.83Yes DOAS-21056501.1035.341.11Yes DOAS-21056401.1034.270.89Yes DOAS-31040501.1033.820.80Yes DOAS-31040 1.1033.050.64Yes DOAS-410100501.1039.541.99Yes DOAS-410100401.1037.631.59Yes NEC Suggests VD of 3% for Feeders or Branch Circuits

24 Initial Cost Comparison Existing SystemDOAS Redesign CAV AHUs (2)$136,000.00 VAV AHUs (2)$42,100.00 CAV RTU$39,300.00 VAV RTU (2)$98,800.00 VAVR Boxes$100,775.00 Diffusers$65,856.00 Duct$112,745.17$67,782.18 DOAS (4) $120,000.00 Chilled Beams $1,502,000.00 Electrical Totals$6,743.08$1505.36 Initial Total Cost$602,319.25$1,691287.54 First Cost Comparison$1,088,968.29

25 20 Year Life Cycle Cost Assume i = 0.06 Payback = 8.7 years Existing SystemDOAS Redesign Initial Cost$602,319.00$1,691,287.54 Years Annual Operating Cost 20$500,428.00$336,367.00 Net Present Worth$5,739,869.743,858,095.85 Total Cost$6,342,188.74$5,549,383.39 Total Potential 20 Year Savings$792,805.35

26 Conclusion DOAS w/ Chilled Beams is Beneficial and Recommended for the Tyler School of Art Considerations  DOAS Design Software  Early Design Coordination for Chilled Beams  Contractor Familiarity

27 Acknowledgments I would like to thank the following for the help throughout the thesis process:  AE Faculty  AE Students  Brinjac Engineering  H2L2 Architects

28 Questions?

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