Recent Development and Application of Geothermal Heat Pump Systems in Cold-Climate Regions of the US: A Further Investigation — Oak Academic Publishing
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Recent Development and Application of Geothermal Heat Pump Systems in Cold-Climate Regions of the US: A Further Investigation
Department of Construction Management and Engineering, North Dakota State University, Fargo, USA
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Department of Construction Management and Engineering, North Dakota State University, Fargo, USA
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Department of Mechanical Engineering, North Dakota State University, Fargo, USA
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Department of Construction Management and Engineering, North Dakota State University, Fargo, USA
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Seasonal Storage Technologies, Princeton, USA
1 Department of Construction Management and Engineering, North Dakota State University, Fargo, USA
2 Department of Construction Management and Engineering, North Dakota State University, Fargo, USA
3 Department of Mechanical Engineering, North Dakota State University, Fargo, USA
4 Department of Construction Management and Engineering, North Dakota State University, Fargo, USA
A Geothermal Heat Pump (GHP) system is known to have enormous potential for building energy savings and the reduction of associated greenhouse gas emissions, due to its high Coefficient Of Performance (COP). The use of a GHP system in cold-climate regions is more attractive owing to its higher COP for heating compared to conventional heating devices, such as furnaces or boilers. Many factors, however, determine the operational performance of an existing GHP system, such as control strategy, part/full-load efficiency, the age of the system, defective parts, and whether or not regular maintenance services are provided. The omitting of any of these factors in design and operation stages could have significant impacts on the normal operation of GHP systems. Therefore, the objectives of this paper are to further investigate and study the existing GHP systems currently used in buildings located in cold- climate regions of the US, in terms of system operational performance, potential energy and energy cost savings, system cost information, the reasons for installing geothermal systems, current operating difficulties, and owner satisfaction to date. After the comprehensive investigation and in-depth analysis of 24 buildings, the results indicate that for these buildings, about 75% of the building owners are very satisfied with their GHP systems in terms of noise, cost, and indoor comfort. About 71% of the investigated GHP systems have not had serious operating difficulties, and about 85% of the respondents (building owners) would suggest this type of system to other people. Compared to the national median of energy use and energy cost of typical buildings of the same type nationwide, the overall performance of the actual GHP systems used in the cold-climate regions is slightly better, i.e . about 7.2% energy savings and 6.1% energy cost savings on average.
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