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Compare geothermal systems

Engineering Report
Standing Column Well vs. Closed Loop Earth Coupling
Geothermal Heat Pump Systems

Abstract
Calculate the effect of a common geothermal heat pump system in a 2200 square foot home located in Stroudsburg, Pennsylvvania with a design heating load of 35,283 BTU.Hr. and a cooling load of 19.183 BTU/Hr. using a standing colmn well (SCW) vs. a closed loop piping system.

Findings of the Report:

Standing Column Well (SCW) System	Closed Loop System (pipes in the ground)
Operation costs = $710	Operation costs = $1,194
Installation cost = $10,000	Installation cost = $22,000

Future cost saving of operating an SCW system vs. closed loop system for fifteen (15) years = $9,002

Investment value of closed loop system vs. SCW system:

Additional installation cost = $12,000
60 month loan @ 7% = $273.61/month
Savings over term of loan = -$42.83/month
Total monthly savings (loss) = -$280.44

Return on investment closed loop vs SCW system:

Investment amount = $22,000
Lifetime of system = 20 years
Savings over life of system = $-13,005.26
Monthly average savings (loss) = -$54.19
Payback years = Never
Return on investment (loss) = -60%

Conclusions:

1. Installations of closed loop GSHP systems increase the costs dramatically.
2. Operation of GSHP systems with a closed loop decreased efficiency.
3. It is recommended that where possible ALL GSHP systems be earth coupled by SCW.

David W. Bonser MSEE PE
September 14, 2009

Pure Energy Technology, Inc.
PO Box 555
Saylorsburg, PA 18353

dwbonser@gmail.com

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Calculations were done using the Elite software package and the ACCA Manual J Building R value standards.