November/December 2022 - 84

solution and one that does not impact
possible future building expansion in
the way a borehole solution might.
Ground sourced heat pumps
connected to geothermal loops make
use of the ground's natural stable
annual temperature, treating the
ground like a " thermal battery. " In
winter, water circulating through
geothermal loops is warmed from the
surrounding ground and then passed
through a refrigeration process that
converts this low temperature to
adequately meet heating and hot water
needs. In the summer the system is
reversed, and heat is removed from the
building and transferred back into the
ground, thereby providing cooling to
the building and effectively recharging
the ground with heat extracted in the
winter. A well-designed system should
adequately deliver one of the most
energy efficient heating and cooling
solutions year-round without affecting
the long-term ground temperature and
most certainly for the life of the
building and beyond. Geo loops have a
life expectancy of more than 100 years.
A recently completed 14-floor
commercial building project in lower
Manhattan utilized all 63, 24-32 ft (7-10
m) diameter 120 ft (37 m) deep
foundations without impacting the
construction schedule. When operational
in 2023, this system will deliver
up to 40% of the building's heating and
cooling needs. The ground sourced heat
pump system combined with an air
source heat pump (known as a hybrid
solution), will have the ability to deliver
one of the most energy efficient allelectric
heating and cooling solutions
possible, utilizing the least amount of
electricity and lowest CO2 emissions.
There are many successful energy
foundation projects reported around
the world, especially in the U.K., Europe
and the U.S., which have been installed
within schools, universities, commercial
buildings, hospitals and
railway stations.
84 * DEEP FOUNDATIONS * NOV/DEC 2022
Installation work
Foundation contractors around the
world not only need to be ready for
delivering this type of solution, but
more importantly should question any
developer who does not utilize their
building foundations in this way. It is a
" no brainer. " A simple, permanent
energy source that has extremely low
first costs and can also be installed with
little or no construction schedule
impact compared to all other geothermal
solutions-a foundation project
with no geothermal loops should be
regarded as an opportunity missed.
Tony Amis is the senior vice president for Endurant Energy (formerly GI Energy) and has more
than 35 years of experience working in construction. This includes managing large foundation
and civil engineering projects in the U.K., Hong Kong and Singapore, and more recently in
delivering renewable energy solutions in the U.K. and U.S.

November/December 2022

Table of Contents for the Digital Edition of November/December 2022

TOC
November/December 2022 - Intro
November/December 2022 - 1
November/December 2022 - 2
November/December 2022 - TOC
November/December 2022 - 4
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