Mechanical Option AE Senior Thesis Spring 2009

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Transcript:

AE Senior Thesis Spring 2009

Presentation Outline Building Overview Existing Mechanical Systems Dedicated Outdoor Air Systems and Chilled Beams Combined Heat and Power Electrical Breadth Architectural Breadth Conclusions

Building Overview Advanced Medicine Location: Danville, PA Size: 300,600 SF, 9 stories Total Project Cost: $108 million Construction Dates : June 2007-Spring 2010

Building Overview Building Use Cardiology Surgery Patient Rooms Clinics Diagnostics Staff Areas Food Service Shell Spaces

Existing Mechanical Systems Chiller Plant New chiller plant being constructed housing: Two existing 900-ton chillers to a new chiller plant One existing free-cooling plate and frame heat exchanger One new 900-ton chiller One new 8,000 ton-hour, thermal energy storage tank

Existing Mechanical Systems Boiler Plant Boiler plant addition being constructed housing: Two new steam boilers, one electric and one gas Two new 8,900 MBH shell and tube heat exchangers for heating water

Existing Mechanical Systems Air handling units Five air handling units to be installed now Three air handling units for the future AHU Air Flow (CFM) Serving VAV/CAV AHU-4-1 18,000 Operating Rooms VAV (F )AHU-4-2 18,000 Operating Rooms VAV AHU-4-3 2,700 Surgical Pharmacy CAV (F) HV-4-4 24,000 Kitchen Make-Up VAV AHU-M-S1 80,000 South VAV AHU-M-S2 80,000 South VAV (F) AHU-M-N1 80,000 North VAV AHU-M-N2 80,000 North VAV

Dedicated Outdoor Air System and Chilled Beams Replace VAV boxes with a dedicated outdoor air system and chilled beams Goals Reduce Energy Use and Cost Improve Ventilation and Indoor Air Quality Reduce Mechanical Space

Dedicated Outdoor Air System and Chilled Beams Advantages Separation of sensible and latent loads Improved indoor air quality (IAQ) Reduced reheating of air Increased comfort level due to chilled beams Ensures ventilation requirements are meet

System Design Outdoor Design Conditions Summer Conditions (0.4%) 90.1 F DB 72.9 F WB Winds: W 9.8 mph Winter Conditions (99.6%) 3 F DB Winds: WNW 7 mph

System Design Indoor Design Conditions Operating Rooms Room temperature: 60 F to 70 F (adjustable by room) 50%-55% RH at 60 F 35%-40% RH at 70 F Patient Rooms Room temperature: 70 F to 75 F (adjustable by room) 30% RH min (winter) 60% RH max (summer) Exam/Treatment Room temperature: 75 F 30% RH min (winter) 50% RH max (summer) Other spaces: Summer: 75 F, 50% RH maximum Winter: 70 F, 30% RH minimum

System Design Replaced AHU-S-1, AHU-S-2, and AHU-N-2 with dedicated outdoor air systems Surgical pharmacy air handling unit eliminated, spaces controlled by south air handling units

System Design Ventilation rates determined by ASHRAE 62.1-2007 and AIA Guidelines for Design and Construction of Hospitals and Health Care Facilities, 2001 AHU DOAS AHU-M-S1 8720 AHU-M-S2 8720 AHU-M-N2 9490 Total 26930

System design Determining supply air temperature Based on temperature needed for latent loads and to control humidity AHU W sp (gr/lb) # of People Q L (Btu/hr) V sa (CFM) W sa (gr/lb) T sa (F) AHU-M-S1 64.4 389 92250 8720 48.84 47.7 AHU-M-S2 64.4 389 92250 8720 48.84 47.7 AHU-M-N2 64.4 484 116000 9510 46.46 46.4

System Design High Induction Diffusers Improve mixing in room Necessary due to low supply air temperatures Allow rooms to meet air change rates

System Design Air Handling Units Trane M-Series Size 21 Airflow range 7350-12600

System Design Enthalpy Wheel Increased energy efficiency T 3 shows temperatures after passing through the enthalpy wheel AHU T 1 T 3 W 1 W 3 ε s ε L T 2 W 2 AHU-M-S1 90.1 70 93.8 64.4 0.85 0.83 73.02 69.40 AHU-M-S2 90.1 70 93.8 64.4 0.85 0.83 73.02 69.40 AHU-M-N2 90.1 70 93.8 64.4 0.85 0.83 73.02 69.40

System Design Chilled Beams Increase thermal comfort Radiation effects Decreased air motion in the space Decreased fan power

Results Air Savings AHU VAV % DOAS Difference System Decrease AHU-M-S1 15000 8720 6280 42% AHU-M-S2 15000 8720 6280 42% AHU-M-N2 19250 9490 9760 51% Total 49250 26930 22320 45%

Results Decreased Mechanical Space Fourth floor mechanical room Removal of AHU-4-3 Mechanical Penthouse Original AHU s 154 x 224 New DOAS AHU s 52 x 77 Decreased mechanical shaft size Original supply ducts from air handling units 108 x 138 New supply ducts from air handling units 42 x 44

Results Improved Indoor Air Quality Decreased recirculation of contaminants Increased mixing due to high induction diffusers

Results Energy Use Savings Annual Electrical Use (kwh) Annual Gas Use (kbtu) Currrent Design 9,470,283.00 3,292,933.00 DOAS/CRCP 7,794,004.00 803,323.00 Difference 1,676,279.00 2,489,610.00 % Difference 18% 76%

Results Energy Cost Savings Annual Electrical Cost Annual Gas Cost Total Cost Currrent Design $ 515,183.40 $ 35,867.14 $ 551,050.54 DOAS/CRCP $ 423,993.82 $ 8,749.92 $ 432,743.74 Difference $ 91,189.58 $ 27,117.22 $ 118,306.80 % Difference 18% 76% 21%

Combined Heat and Power (CHP) Install combined heat and power plant on site Goals Lower Energy Use Lower Emissions Lower Energy Cost

Combined Heat and Power Feasibility Sparks Gap > $12/MMBTU Advanced Medicine Sparks Gap = $5/MMBTU Much lower than recommended for energy cost savings

Combined Heat and Power Feasibility Campus Design Geisinger Campus

Combined Heat and Power Feasibility Existing on site equipment Geisinger Many of the chillers and boilers are existing Necessary hot water significantly decreased by DOAS For optimal use chiller plant would have to be converted to absorption chiller plant

Electrical Breadth Dedicated Outdoor Air Decreases amount of power needed AHU motor size change Decreases breaker sizes

Electrical Breadth Dedicated Outdoor Air System AHU motor size changes AHU Supply Fan Motor HP NEW Supply Fan Motor HP AHU-4-1 50 50 AHU-4-3 6.2 - AHU-M-N2 150 15 AHU-M-S1 150 15 AHU-M-S2 150 15

Electrical Breadth Dedicated Outdoor Air System AHU breaker size changes Breakers Breakers Service Removed Added AHU-4-3 100-100 - 100 - AHU-M-N2 250 50 250 50 250 50 AHU-M-S1 250 50 250 50 250 50 AHU-M-S2 250 50 250 50 250 50

Electrical Breadth Combined Heat and Power Power lines to hospital would have to be redesigned Due to the distance from the boiler house this would add a significant amount of cost Back-up power would also have to be available

Architectural Breadth Dedicated Outdoor Air System Slight increase of space on fourth floor Decreased size of mechanical penthouses

Architectural Breadth Dedicated Outdoor Air System

Architectural Breadth Dedicated Outdoor Air System

Architectural Breadth Combined Heat and Power Boiler house addition would need to be increased to provide space for gas turbines

Conclusions Dedicated Outdoor Air System Should be implemented Energy Savings Increased Air Quality Increased Thermal Comfort Combined Heat and Power Should not be implemented Cost savings would not be significant Difficult to integrate into existing systems

Questions?