Accession Number : ADA502785


Title :   Ground Source Heat Pumps vs. Conventional HVAC: A Comparison of Economic and Environmental Costs


Descriptive Note : Master's Thesis


Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH GRADUATE SCHOOL OF ENGINEERING AND MANAGEMENT


Personal Author(s) : Fredin, Paul W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a502785.pdf


Report Date : 26 Mar 2009


Pagination or Media Count : 163


Abstract : The world is undergoing a dramatic transformation with regard to how it produces and consumes energy due to increasing demand from developing nations and diminishing new resource discoveries. In addition, there has been increased concern over the effect of carbon dioxide emissions on the environment. All of these issues have created a combined pressure to force the world to begin to redefine how energy is utilized. Geothermal or ground source heat pumps (GSHPs) may provide one potential solution to these problems. This research investigated vertical borehole closed-loop GSHP systems in direct comparison to natural gas furnaces combined with traditional air-conditioning (NGAC) for 51 locations in the United States. The study utilized Trane Trace 700, Geothermal Loop Design, and Building Life-Cycle Cost 5 software packages for analysis. Although the installation costs for GSHP systems were 257% higher than NGAC systems, the operating costs were 33% lower. The mean simple and discounted payback periods for the GSHP system were 10 and 15 years, respectively. Carbon dioxide emissions were found to be 2.2% higher for the GSHP systems due to their use of coal-fired electricity in most locations. The overall life-cycle cost was 19.0% lower when selecting the GSHP system over the NGAC system.


Descriptors :   *GROUND LEVEL , *HEAT PUMPS , *CARBON DIOXIDE , *LIFE CYCLE COSTS , *ECONOMIC ANALYSIS , *EMISSION , PRESSURE , NATURAL GAS , COAL , ELECTRICITY , DEVELOPING NATIONS , CLOSED LOOP SYSTEMS , FURNACES , GEOTHERMY , BOREHOLES


Subject Categories : Economics and Cost Analysis
      Inorganic Chemistry
      Air Condition, Heating, Lighting & Ventilating


Distribution Statement : APPROVED FOR PUBLIC RELEASE