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Energy from the Earth

Project for Envs:494
by

Melissa Larsen

on 12 March 2010

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Transcript of Energy from the Earth

Ground Source Heat Pump Technology at Penn Current Energy Use at Penn




Ground Source Heat Pump Technology




Cost and Life Cycle Analysis of GSHP




Future Energy Possibilities at Penn



Current HVAC system: chilling units and steam
Make up a large portion (over 50%) of Penn's total energy load
Penn's Climate Action Plan: Reduce energy usage
by 5% by 2010 and 17% by 2014.
With these goals, significant steps need to be taken to
reduce energy. Current Energy use at Penn Ground Source Heat Pump Technology (GSHP) GSHP systems provide:
Heating and Cooling
Potentially hot water
But also:
Energy efficiency
Less maintenance
Less space needs
Low operating costs
More stable capacity
Better comfort and air quality
Reduced peak elecrical loads for air conditioning GSHP system components:
1) Earth Connection
2) Liquid source heat pump
3) Interior heating/ cooling
distribution system Vertical Ground Connection Horizontal Ground Connection Groundwater Connection Ground Source Heat Pumps Inspiration 1) Richard Stockton College, New Jersey
2) Ball State University, Indiana
3) Yale University
4) Harvard University
5) Hamilton College
6) West Chester University
and many more... Cost and Life Cycle Analysis Richard Stockton College:
Closed loop vertical system
400, 425 ft deep wells
Under 4 acre parking lot
Heats and cools 440,000 sq. ft
Cost $1.2 million more to install and saves $400,000 annually in fuel and maintenance alone. Also reductions of 25% in electricity and 70% in natural gas
4-8 year pay back
Ball State University:
4,000 wells closed loop vertical
Overall project should save $2 million annually in fuel costs alone
Heat and cool 45 buildings
Will cut half of total campus carbon emissions
President signed climate commitment and shortly after needed to replace heating system for campus. (coal fired boilers)
Decided to take a different approach. West Chester University:
Closed loop vertical system
Beneath tennis and basketball courts
Changing from reliance on steam from a coal plant
Implementing ground source heat pumps in phases Difficult to determine life cycle costs because the systems are based on many variables:
Climate
Soil and Bedrock Type
System type
etc.
Future GSHP Potential at Penn: Philadelphia avg ground temp: 55-57 F
Bedrock geology beneath campus varies slightly. Mostly undifferentiated sand and gravel
Vertical heat pump is best
Model our installation on West Chester University.
Geothermal Barriers:
Unstable ground at Penn Park
Questionable payback
Current system incompatibility
Financing
Implementation vertical heat pumps in phases
Not as large investment
Shorter payback time
Test for potential future heat pumps.
My proposed location is Hill Square and the New College House
The open square is enough area to power the new building. Questions?
See my presentation at
http://prezi.com/ghvtchqdtdqa/
Full transcript