Integration of Mechanical System Redesign Geothermal Heat Pump Redesign Wesley S. Lawson Architectural Engineering Mechanical Option Pennsylvania State.

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Presentation transcript:

Integration of Mechanical System Redesign Geothermal Heat Pump Redesign Wesley S. Lawson Architectural Engineering Mechanical Option Pennsylvania State University The New Learning Center Lutheran Theological Seminary at Philadelphia

Building Statistics Building Size 58,000 square feet Approximate Project Cost $14,880,000 Delivery Method Design-Bid-Build Construction Dates March 2004 to February 2006 Wesley S. Lawson – LTSP The New Learning Center Top picture by GYA Architects, Inc. Bottom picture by Wes Lawson

Building Statistics Owner Lutheran Theological Seminary at Philadelphia Architect GYA Architects, Inc. MEP Engineer Paul H. Yeomans, Inc. Structural Engineer O’Donnell & Naccarato, Inc. Wesley S. Lawson – LTSP The New Learning Center Pictures by Wes Lawson

Building Statistics Stone façade from original building Basement – Storage 1 st Floor – Reception Hall, Lounges, and Kitchen 2 nd, 3 rd Floor – Classrooms and Offices Wesley S. Lawson – LTSP The New Learning Center Top picture by GYA Architects, Inc. Bottom picture by Wes Lawson

Presentation Outline Design Goals and Considerations Existing Systems Building Loads Mechanical Redesign Electrical Redesign CM Studies Conclusions Recommendations Wesley S. Lawson – LTSP The New Learning Center

Design Goals and Considerations Feasible System Individual Occupant Comfort and Control Energy Efficient Low Cost –Operation Cost –Initial Cost –20 Year Life Cycle Cost Low Site Emissions Wesley S. Lawson – LTSP The New Learning Center

Existing Mechanical System DOAS with Fan Coil Terminal Units –(3) Rooftop Units with Enthalpy Wheels DX cooling with gas heat –Basement Supply Air Plenum –Air Cooled Chiller (150 tons) –(2) Gas Heat Boilers (1800 MBH each) –(66) Fan Coil Units Wesley S. Lawson – LTSP The New Learning Center

Chilled Water Schematic Wesley S. Lawson – LTSP The New Learning Center

Hot Water Schematic Wesley S. Lawson – LTSP The New Learning Center

Fan Coil Schematic Wesley S. Lawson – LTSP The New Learning Center

Cooling Building Loads Original Design –150 tons for Fan Coil Units –62 tons of DX in Rooftop Units Wesley S. Lawson – LTSP The New Learning Center New Calculations –166 tons for building peak load –All equipment on the same load source

Heating Building Loads Original Design –150 tons for Fan Coil Units –n+1 Boiler design –52.5 tons of gas heat in Rooftop Units Wesley S. Lawson – LTSP The New Learning Center New Calculations –125 tons for building peak load –All equipment on the same load source

Design Goals and Considerations Feasible System Individual Occupant Comfort and Control Energy Efficient Low Cost –Operation Cost –Initial Cost –20 Year Life Cycle Cost Low Site Emissions Wesley S. Lawson – LTSP The New Learning Center

Mechanical System Redesign Choice Why? Can be 100% OA system Terminal Heat Pumps can maintain individual control Energy Efficient Low Operation Cost Zero on site emissions Wesley S. Lawson – LTSP The New Learning Center Image by WaterFurnace

Electrical Questions ??? Will the system size increase? Will additional power panels need to be added? Will the emergency power need to be increased? Will the units need to be circuited differently? Wesley S. Lawson – LTSP The New Learning Center

CM Questions ??? Will construction cost increase for the mechanical and electrical systems? Will construction time increase for the mechanical and electrical systems? Where will additional construction efforts take place? Will the redesign affect the on time delivery? Wesley S. Lawson – LTSP The New Learning Center

Geothermal Alternative 1 Geothermal Loop sized for heating load –125 tons Cooling Tower sized for excess cooling load –41 tons RTU-4 added Wesley S. Lawson – LTSP The New Learning Center Image by Trane, Inc.

Geothermal Alternative 1 Wesley S. Lawson – LTSP The New Learning Center

Geothermal Alternative 2 Geothermal Loop sized for Highest Capacity –166 tons Cooling is not supplemented by a Cooling Tower –Extra capacity in loop for heating conditions RTU-4 added Wesley S. Lawson – LTSP The New Learning Center

Geothermal Alternative 2 Wesley S. Lawson – LTSP The New Learning Center

Geothermal Alternative Bore Comparison Alternative 1 Wesley S. Lawson – LTSP The New Learning Center Alternative 2

Operation Energy Consumption Wesley S. Lawson – LTSP The New Learning Center Original Fan Coil Design Alternative 1 Alternative 2 Total Energy% of TotalTotal Energy% of TotalTotal Energy% of Total SourcekWh/yrEnergykWh/yrEnergykWh/yrEnergy Boiler and accessories312, %-0.0%- Heat Pump Heating-0.0%165, %166, % Chiller and accessories38,8145.7%-0.0%- Heat Pump Cooling-0.0%57, %57, % Cooling Tower-0.0%1,6660.3%-0.0% Fans210, %108, %109, % Pumps12,2571.8%76, %92, % Lighting146, %146, %146, % Total Energy Consumption680, %555, %571, % Total Cost per Year$88,523 $72,200 $74,338

Emissions Wesley S. Lawson – LTSP The New Learning Center Fan Coil DesignAlternative 1Alternative 2 Emissions Pollutantlbm / year CO 2 1,001,358766,431789,128 SO x 4,3154,1884,312 NO x 2,9422,4662,539 Particulates36700

Initial Cost of Mechanical Equipment Wesley S. Lawson – LTSP The New Learning Center Fan Coil DesignAlternative 1Alternative 2 Cost$389,175$376,175$368,425 Cost of Differing Mechanical Equipment Highest Cost Equipment –Fan Coil Design: Chiller, 2 Boilers –Alternative 1: Heat Exchanger, Heat Pumps, RTU-4 –Alternative 2: Heat Exchanger, Heat Pumps, RTU-4

Electrical Redesign Answering Questions System increased from 690 to 823 kVA (20%) Increased from 4 to 5 power panels No increase in emergency power system One circuit per Heat Pump instead of multiple Fan Coils on a single circuit Wesley S. Lawson – LTSP The New Learning Center

Electrical Redesign Wesley S. Lawson – LTSP The New Learning Center

Electrical Power Cost Wesley S. Lawson – LTSP The New Learning Center Fan Coil DesignAlternative 1Alternative 2 Cost$134,089$260,962 Cost / SF $2.31$4.50

Construction Time Wesley S. Lawson – LTSP The New Learning Center HoursFan Coil DesignAlternative 1Alternative 2 Mechanical Electrical Total Time of Differing Mechanical and Electrical Construction Highest Labor Time –Fan Coil Design: Chiller, Boilers, Building Piping –Alternative 1: Heat Pumps, Geothermal Ground Piping –Alternative 2: Heat Pumps, Geothermal Ground Piping

Construction Cost Wesley S. Lawson – LTSP The New Learning Center CostFan Coil DesignAlternative 1Alternative 2 Mechanical$186,819$368,622$448,441 Electrical$33,679$85,517 Total$220,498$454,139$533,958 Cost of Differing Mechanical and Electrical Construction Highest Construction Equipment Cost –Fan Coil Design: 500 MCM feeder wires –Alternative 1: 600 MCM feeder wires, transformer –Alternative 2: 600 MCM feeder wires, transformer

Total Life Cycle Cost Wesley S. Lawson – LTSP The New Learning Center CostFan Coil DesignAlternative 1Alternative 2 Total Initial Cost$710,083$1,005,759$1,077,828 Yearly Operation Cost$88,523$72,200$74, Year Life Cycle$2,480,543$2,449,759$2,564,588 Savings$30,784-$84,045

Total Life Cycle Cost Energy Policy Act of 2005 –16 2/3% energy reduction qualifies for tax deductions –$0.60 per square foot Saves an extra $6,960 per year 20 Year life cycle –Alternative 1: $170,000 saved –Alternative 2: $55,150 saved Wesley S. Lawson – LTSP The New Learning Center

Geothermal Alternatives Alternative 1 is the clear selection because: –Lower Initial Cost –Lower Operation Cost –Lower Life Cycle Cost –Lower Construction Time –Lower Emissions –Equivalent Individual Occupant Control –Will have less affect on the Earth temperature due to cooling tower Wesley S. Lawson – LTSP The New Learning Center

Alternative 1 vs. Existing System Alternative 1 advantages: –Lower Operation Cost –Air Handling Unit for Basement –Lower 20 Year Life Cycle Cost by $170,000 –Lower Emissions Fan Coil System Advantages: –Lower Initial Cost by $300,000 –Lower Construction Time Wesley S. Lawson – LTSP The New Learning Center

Personal Recommendation Alternative 1 Geothermal Heat Pump System –System Operation –Life Cycle Cost –Operation Cost Wesley S. Lawson – LTSP The New Learning Center Image by WaterFurnace

Questions? Wesley S. Lawson – LTSP The New Learning Center Top picture by GYA Architects, Inc. Bottom picture by Wes Lawson Pictures by Wes Lawson