Estimation of Shallow Geothermal Energy Resource in Canada: Heat Gain and Heat Sink
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Maps of shallow depth (down to −250 m) temperature distribution across Canada show large variability, related mainly to surface climatic forcing. Very small changes of temperature with depth in the upper 250 m are related to heat gained by the subsurface due to recent global warming. Temperature data compiled from precise temperature logs in equilibrium wells, and temperature time series from a network of meteorological stations, allow calculation of the available heat energy for heating in the cold period and for cooling in peak warm months. Utilization of this energy resource has the potential for significant CO2 reduction in Canada. The geothermal energy stored in the ground can be used, with the help of heat pumps, for heating, given very low winter temperatures. The amount of potential heat available is vast. In Canada, south of permafrost border, the integrated value of potentially available heat during the heating season down to −50 m is 1.1 E21 J (1100 quads).
KeywordsGeothermal energy Canadian geothermal heat pumps heat flow climate change mitigation
The authors thank Dr. Alan Jessop, Dr. Zhuocheng Chen, and an anonymous reviewer for their helpful comments. The work has been supported by Environment Canada and Geological Survey of Canada Contribution No. 20080659.
- Clauser, C., 2006, Geothermal energy, in Heinloth, K., ed., Landolt-Börnstein, Group VIII “Advanced materials and technologies”, Vol. 3 “Energy technologies”, Subvol. C “Renewable energies”, Springer Verlag.Google Scholar
- Eugster, W. J., and Rybach, L., 2000, Sustainable production from borehole heat exchanger systems: Proceedings World Geothermal Congress 2000, Kyushu – Tohoku, Japan, May 28–June 10, 2000, p. 825–830.Google Scholar
- Ghomshei, M. M., MacLeod, K., Sadlier-Brown, T. L., Meech, J. A., and Dakin, R. A., 2005, Canadian geothermal energy poised for takeoff: Proceedings World Geothermal Congress, 4 p.Google Scholar
- Hanova, J., 2007, Environmental and techno-economic analysis of ground source heat systems. Master of Science thesis, The Faculty of Graduate Studies; Resource Management and Environmental Studies, University of British Columbia, 2007.Google Scholar
- Hanova, J., and Dowlatabadi, H., 2007, Strategic GHG reduction through the use of ground source heat pump technology: Environ. Res. Lett., v. 2 044001, 8 pp. doi: 10.1088/1748-9326/2/4/044001.
- IHFC and NOAA Borehole Temperatures and Climate Reconstructions Database, 2002, http://www.geo.lsa.umich.edu/climate/NAM.html.
- Intergovernmental Panel on Climate Change (IPCC 2007). Final report. http://www.ipcc.ch/ipccreports/ar4-syr.htm.
- Jessop, A. M., Allen, V. S., Bentkowski, W., Burgess, M., Drury, M., Judge, A. S., Lewis, T., Majorowicz, J., Mareschal, J. C., and Taylor, A. E., 2005, The Canadian geothermal data compilation: Geological Survey of Canada, Open File 4887.Google Scholar
- Jones, F. W., Lam, H.L., and Majorowicz, J. A., 1985, Temperature distributions at the Paleozoic and Precambrian surfaces and their implications for geothermal energy recovery in Alberta: Canadian Journal Earth Sciences, v. 22, p. 1774–1780.Google Scholar
- Judge, A. S., Taylor, A. E., and Burgess, M., 1979, Canadian geothermal data collection-Northern wells 1977–78: Geothermal Series Earth Physics Branch EMR, no. 11, 188 p.Google Scholar
- Judge, A. S., Taylor, A. E., Burgess, M., and Allen, V. S., 1981, Canadian geothermal data collection-Northern wells 1978–80: Geothermal Series Earth Physics Branch EMR, no. 12, 190 p.Google Scholar
- Majorowicz, J. A., Skinner, W., Safanda, J., and Gosnold, W., 2006a, Differences between repeated borehole temperature logs in the southern Canadian Prairies- validating borehole climatology: Climate of the Past Discussion, v. 2, p. 1075–1104.Google Scholar
- Majorowicz, J. A., Grasby, S. E. Ferguson, G., Safanda, J., and Skinner, W., 2006b, Climate of the past: paleoclimatic reconstructions in western Canada from borehole temperature logs: surface air temperature forcing and groundwater flow: Climate of the Past, v. 2, p. 1–10.Google Scholar
- Majorowicz, J. A., Safanda, J., and Skinner, W., 2004, Past surface temperature changes as derived from continental temperature logs—Canadian and some global examples of application of a new tool in climate change studies: Adv. Geophys., Chapter 3, v. 47, p. 113–174.Google Scholar
- MIT Report on The Future of Geothermal Energy, 2007, http://geothermal.inel.gov/publications/future_of_geothermal_energy.pdf.
- Smith, S. L., and Burgess, M., 1998, Mapping the response of permafrost in Canada to climate warming: Geological Survey of Canada Current Research, 1998-E, p. 163–171.Google Scholar
- Taylor, A. E., and Judge, A. S., 1974, Canadian geothermal data collection-Northern wells 1974: Geothermal Series Earth Physics Branch EMR, no. 3, 171 p.Google Scholar
- Taylor, A. E., and Judge, A. S., 1976, Canadian geothermal data collection-Northern wells 1975: Geothermal Series Earth Physics Branch EMR, no. 6, 143 p.Google Scholar
- Taylor, A. E., and Judge, A. S., 1977, Canadian geothermal data collection-Northern wells 1976–77: Geothermal Series Earth Physics Branch EMR, no. 10, 194 p.Google Scholar
- Taylor, A. E., Burgess, M., Judge, A. S., and Allen, V. S., 1982, Canadian geothermal data collection-Northern wells 1981: Geothermal Series Earth Physics Branch EMR, no. 13, 153 p.Google Scholar
- The Canadian Centre for Energy Net Information, 2007, http://www.centerforenergy.net/silos/ET-CanEn01.asp.
- Zhang, X., Vincent, L. A., Hogg, D. W. and Niitsoo, A.2000. Temperature and precipitation trends in Canada during the 20th century: Atmosphere-Ocean, v. 38, p. 395–429.Google Scholar