Geo Thermal heatpump

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