Architectural Engineering Senior Thesis Mechanical System Redesign
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1 Saint Joseph Medical Center Architectural Engineering Senior Thesis Mechanical System Redesign Chris Nicolais
2 Building Description Existing Mechanical System Proposed Redesign Alternative Option Emergency Power System Equipment Installation Redesign Conclusions
3
4 Shell and Core construction 4 Story, 64, square feet Fit-outs based on tenant needs Keep construction cost low Maximize leasable area 12,7 ft2 open, 3,3 ft2 core
5 Multi-disciplinary offices Conference and waiting rooms Patient exam rooms 2 Linear accelerators PET/CT scanner Nuclear lab Infusion suites Radiology rooms
6 Structure Steel superstructure Reinforced, composite concrete slabs Electrical 15kVA utility transformer 48Y/277V, 2,5 amp main switchboard Construction AIA 111, Guaranteed cost plus fee
7 3 packaged roof top AHUs Direct expansion electric cooling 2% outdoor air Fan powered VAV terminal units Electric reheat coils at each box Ducted supply, plenum return 9 Domestic water heaters 2-3 watt elements
8 Ground Floor First Floor AHU-1 37, cfm 13 ton AHU-3 1,68 cfm 3 ton
9 Second Floor AHU-2 Third Floor 36, cfm 13 ton
10 Design Simulation Design Simulation AHU-1 37, cfm 25,7 cfm 13 tons 78.3 tons AHU-2 36, cfm 15,915 cfm 13 tons 7.6 tons AHU-3 1,68 cfm 5,278 cfm 3 tons 19.2 tons Total 83,68 cfm 46,263 cfm 29 tons tons Difference 37,417 cfm tons
11 Site Energy (kbtu) Component Air System Fans 1,186,868 Cooling 38,12 Heating 1,18,467 Pumps Cooling Towers HVAC Sub Total 2,243,437 Lights 863,853 Electric Equipment Misc. Electric 365,83 Misc. Fuel Use Non HVAC Sub Total 1,229,656 Grand Total 3,473,93 All electric energy consumption Electric heating coils Domestic heaters water
12 2 Computer room ACUs Nuclear lab equipment cooling Fan powered HEPA ceiling modules Clean and ante rooms 3 Chillers with closed loop glycol systems Direct cooling for both linear accelerators and the PET/CT scanner
13 Goals Reduce energy consumption Improve system efficiency Decrease annual operating cost Reduce emissions Concerns System cost
14 Create a dedicated chiller plant Cool using chilled water Heat using boiler water Equipment Necessary Chiller Cooling Tower Boiler Chilled Water AHU
15 AHU ton, 45,488 cfm Chiller 136 ton electric screw chiller R-134a refrigerant 85 F EWT / 44 F LWT Single load constant flow primary pump Cooling Tower Design 3 gpm per ton 49.5 gpm induced draft crossflow
16 Gas-fired boiler Sized for space heating and service hot water using ASHRAE Applications Handbook 865,534 BTU per hour Fin-tube radiators at perimeter loads
17 Hot water storage tank 492 gallon capacity Water water heat exchanger uses boiler water Fixture Number Basin, Private Lav 3 Service Sink 4 Shower 1 Wash Sink 65 Total Required Flow (gallons per hour)
18 Existing v. Redesign Energy Consumption by Energy Source Existing Redesign Site Energy (kbtu) Site Energy (kbtu) Percent Difference Component Electric 2,243,55 1,913, decrease Natural Gas 75, increase HVAC Sub Total 2,243,55 2,664, increase Electric 1,229,66 863, decrease Natural Gas Non HVAC Sub Total 1,229,66 863, decrease Grand Total 3,473,21 3,528, increase Redesigned system consumes 1.57% more energy Emissions Data Annual Emissions Existing Redesign CO2 (lb) SO2 (g) Nox (g) 1,44,722 1,418,149 Percent Difference.95 increase 3,481 2, decrease 2,46 1,89 Redesigned System produces less SO2 and NOx 7.93 decrease
19 Data based on RS Means 28 Mechanical Cost Data and contractor payment sheet provided by engineer Redesigned system equipment costs $14,47 less than existing system equipment, no payback period Mechanical Equipment Cost Existing Redesign Item Cost ($) 28 Cost ($) 26 Item Cost ($) 28 Cost ($) 26 Domestic Water Heaters* 3,35 Boiler 1,412 9,746 Air Handlers* 22,9 Hot Water Storage Tank 8,518 7,973 Fan Powered VAV, w/ rehea 14, ,459 Water Water Heat Exchange Air Handler 196,5 183,53 Chiller 59,96 55,314 Cooling Tower 15,25 14,232 Expansion Tank Fin Tube Radiators 11,396 1,667 VAV Boxes 44,24 41,49 Total System First Cost 337,79 323,662
20 Table 35 Annual Costs Component Air System Fans Cooling Heating Pumps Cooling Tower Fans HVAC Sub Total Lights Electric Equipment Misc. Electric Misc. Fuel Use Non HVAC Sub Total Grand Total Cost ($) Existing Redesign 34,718 35,623 1,153 13,859 28,758 1,924 1,56 6,258 64,629 59,224 25,241 25,681 1,689 35,93 25,681 1,559 84,95 Percent Difference 2.57 increase increase decrease 2. increase 2. increase 8.73 decrease 1.73 increase. 2. decrease decrease decrease Redesigned system operating costs $15,654 less each year
21 Utilize campus chilled water 4 chiller plant 216,28 tons per year needed Purchase at $.1 per ton Cooling $13,859 Pumps $1,56 Cooling Tower Fans $6,258 Total $21,667
22 Cost data associated with hydronic distribution Item Untis Amount Material Cost ($) Labor Cost ($) Total Cost ($) Total Cost ($) 26 Site Earthwork Per linear foot Black Steel Service Pipe Per linear foot ,62. 93, Venturi Flow Measuring Device Each ,99. 1,28.66 Total 11,63. 95,1.41 Eliminate purchase of new chiller and cooling tower total savings $69,536 More costly to connect to existing plant Complications Connecting healthcare and non-healthcare buildings to the same plant Different building codes Owner would prefer stand-alone building for resale Hospital retains capacity for future expansion
23 RS Means 28 Mechanical Cost Data Existing Mechanical System Equipment Construction Costs Daily Output Labor Cost Installation Total Labor Total Labor Cost Item Amount (items per day) ($ per item) Time (days) Cost ($) base ($) Baltimore 31 ton AHU , ,825 2, ton AHU* , ,46 2,715 Domestic Water Heaters ,13 2,74 Fan Powered VAV Boxes w/ reheat ,823 1,44 Total ,211 36,389 Existing equipment: 38 days, $36,389
24 Redesigned Mechanical System Equipment Construction Costs Daily Output Labor Cost ($ Total Installation Total Labor Item Amount (items per day) per item) Time (days) Cost ($) AHU , ,94 Chiller , ,66 Cooling Tower* ,179 VAV Boxes ,19 Boiler , ,459 Hot Water Storage Tank Expansion Tank Fin Tube Radiators** ,498 Total ,15 Redesigned equipment: 35 days, $42,476 Total Labor Cost ($) 15,841 9,413 1,41 8,43 3, ,855 42,476
25 Maximize leasable space Existing floor plans leave no room for mechanical equipment Construct a 2 square foot mechanical housing
26 Mechanical Room Construction Cost Material and Labor ($/ft2) Total (28) Total(26) Item Slab on Grade , ,314.7 Roof Brick Face Composite , , Steel Doors 3,45. 3,229.2 Total 21, ,847.4 Equipment housing increases mechanical system first cost by $5,5 Make area in ground floor plan Requires.4 percent reduction in leasable space Approximately 79.3% open for tenant use 8% ideal for MOB
27 Engineers limited by shell and core design Low first cost mechanical equipment Approximate occupant loads for system sizing Easily adaptable equipment for fit-out floor plans Redesign system 1.57% energy consumption increase Reduced emissions $15,654 annual operating cost savings Even equipment and installation costs Redesigned system would be preferred to optimize performance
28 Thanks to Leach Wallace Associates, DASCO Companies, Dr. William Bahnfleth, AE friends
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