This page is designed to make available (for download) the energy related writings of Bill Martin. The entries are aligned with geothermal heat pump technologies and their growth in the United States. The graph (above) shows the annual differences between air temperature and underground dirt at three (orange line) and seven feet (black line).

Written Publications Available for Download
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fundamentals_that_enable_geo_heat_pumps__1_of_4_.pdf  Content: Underground Heat transfer

fundamentals_that_enable_geo_heat_pumps__2_of_4_.pdf  Content: Structure and Function of the Underground Heat Exchanger (GHEX)

fundamentals that enable_geo_heat_pumps__3_of_4_.pdf.  Content: Phase Change, Refrigerant Compression and GHP Heat Exchangers

fundamentals_that enable_geo_heat_pumps__4_of_4_.pdf  Content: A Review of Geo Installations, Large and Smaller