Transcript
GEOTHERMAL
HEAT PUMP
by :SAGAR GOWDA S.R
INTRODUCTION
Geothermal heat pumps are also known by a variety of other
names, including geo exchange, earth-coupled, earth energy
or water-source heat pumps.
Geothermal Energy is energy stored in the form of heat
beneath the surface of the solid earth.
SITE SELECTION FOR GHP
• GEOLOGY-Factors such as the composition and properties of soil and
rock (which can affect heat transfer rates) requireconsideration when designing a ground loop.
• HYDROLOGY-Ground or surface water availability also plays a part in
deciding what type of ground loop to use. Depending onfactors such as depth, volume, and water quality, bodies ofsurface water can be used as a source of water for an open-loop system, or as a repository for coils of piping in a closed-loop .
• LAND AVAILABILITY-
The amount and layout of land, your landscaping, and the
location of underground utilities or sprinkler systems also contribute
to your system design
Components of GHP Systems
• Earth connection
Ground-coupled (CLOSED LOOP)
• Closed loop have following arrangements
Horizontal
Vertical
Groundwater
Surface water
• Liquid-source heat pump or Refrigeration system.
• Interior heating/ cooling distribution subsystem like Conventional ducts.
HORIZONTAL CLOSED LOOP
VERTICAL CLOSED LOOP
POND/LAKE CLOSED LOOP
•
WORKING OF GHP
WORKING OF GHP
• In GHP refrigerant along with water or some ant freezing
agent like 20% propylene glycol etc. acts as a medium of
heat carrier.
• In the winter the normal heat pump system extracts heat
from outdoor air and transfers it inside where it is
circulated through your home's ductwork by a fan.
• In the summer system works as refrigerator, which
extracts heat from the room (space to be cooled) and
transfers it to the ground the loop channel
ADVANTAGES OF GHP
• Simpler in design and maintenance
• Does not require a unit outside exposed to the weather
• Longer equipment life
• They use less refrigerant
• Its great advantage is that it works by concentrating naturally existing heat, rather than by producing heat through combustion of fossil fuels.
• It use constant temperature resource
• They do not require supplemental energy during extreme outside air temperature
DISADVANTAGES
• Higher initial cost due to excavation for piping or
drilling of a well
• Lack of trained and experienced designers and
installers
• Lack of understanding by government regulators
• Shallow horizontal heat exchangers are affected
by surface (air and sun) temperature variations –
thus, requiring 30 to 50% more pipe in the
ground.
CONCLUSION
. Mainly it use naturally existing heat, rather
than by combustion of fossil fuels. These
are best suited for large building loads,
such as schools, commercial buildings, etc.
and for new construction, as retrofits are
expensive. Also they can serve well in both
the winter and summer seasons with a high
efficiency but their cost of installation is
very high however the running cost is low.
REFERENCE
•http://bechtel.colorado.edu/GA/Presentations/03_Lund.ppt
•http://www.retscreen.net/download.php/ang/130/1/Course_gshp.ppt
•http://ingramswaterandair.com/geothermal-heat-pump/components-of-a-geothermal-heat-pump
•http://www1.eere.energy.gov/geothermal/geothermal_basics.html
•http://www.energysavers.gov/your_home/space_heating_cooling/index.cfm/mytopic=12640
•http://apps1.eere.energy.gov/geothermal/projects/projects.cfm/ProjectID=108
•http://www.cres-energy.org/techbasics/geothermal_div1.html
THANK
YOU
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