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Topic: Geothermal exchange heat pump

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	Geothermal exchange heat pump - Wikipedia, the free encyclopedia
		All geothermal heat pumps are characerized by an external loop containing water and antifreeze (propylene glycol, denatured alcohol or methanol), and a much smaller internal loop containing a refrigerant.
		In the heating mode, the external fluid is pumped from the well at 8-16 degrees Celsius and passes through the heat exchange unit.
		Meanwhile the internal gas is pumped to the compressor where it pressurized causing it to condense into a liquid, which releases the heat and the heat exchanger warms the neigboring air of the house.
	en.wikipedia.org /wiki/Geothermal_exchange_heat_pump (564 words)

	Heat pump - Wikipedia, the free encyclopedia
		Heat pumps are realized through several physical effects, but they are classified depending on their applications (driving energy, source and sink of heat, or a heat pump which is basically a refrigeration machine).
		Since the heat of the ping pong ball volume is now a higher concentration than the surrounding heat, the heat is given off until the ping pong ball volume heat reaches the same concentration of heat as the surrounding area.
		Commercial heat pump technologies are currently in a stage of rapid improvement: the COP for commercially available heat pumps has risen in the last 5 years from 3 to 4 and even (in a few cases) 5.
	en.wikipedia.org /wiki/Heat_pump (1117 words)

	NationMaster.com - Encyclopedia: Heat pump (Site not responding. Last check: 2007-10-18)
		The coefficient of performance of a heat pump is the ratio of the output heat to the supplied work or where Q is the useful heat supplied by the condenser and W is the work consumed by the compressor.
		Heat Pumps are usually characterized by a coefficient of performance which is the number of units of energy delivered to the hot reservoir per unit work input.
		The coefficient of performance (CP) for a heat pump is the ratio of the energy transferred for heating to the input electric energy used in the process.
	www.nationmaster.com /encyclopedia/Heat-pump (1835 words)

	NationMaster.com - Encyclopedia: Geothermal exchange heat pump (Site not responding. Last check: 2007-10-18)
		A geothermal exchange heat pump is a heat pump that uses the Earth as either a heat source or a heatsink depending on the mode of operation: heating or cooling.
		Geothermal heat pumps are either open or closed systems and typically consist of a loop of pipe, a compressor, and a pump.
		In the cooling mode, household air is drawn through a heat exchange unit where the internal fluid is allowed to expand and evaporate absorbing the heat of vaporization from the air.
	www.nationmaster.com /encyclopedia/Geothermal-exchange-heat-pump (1075 words)

	GeoThermal Heat Exchange HVAC
		Geothermal heat as we now apply the term refers to the art of extracting latent geothermal heat from the ground.
		The heat pump itself consists of primarily a compressor and a heat exchanger.
		The geothermal heat pump itself resides in your home and really gets all of the credit for heating and cooling the home, but it is actually the miracle of nature through ground heat that provides the renewable resource which makes the system capable of doing its job on an on-going basis.
	www.radiantmax.com /geo-thermal.html (472 words)

	Sunteq/Enviroteq Geothermal Heat Pumps - How they work
		As an air-conditioner, a heat pump's indoor coil (heat exchanger) extracts heat from the interior of a structure and pumps it to the coil in the unit outside where it is discharged to the air outside (hence the term air-to-air heat pump) and
		A ground-water heat pump extracting heat from water at freezing is approximately equal in performance to that of an air-source heat pump extracting heat from 60 degree air.
		As heat is extracted from the water in the loop the temperature of the loop falls and the heat from the source flows toward the loop.
	www.geothermalheatpump.com /how.htm (1392 words)

	geothermal heat pump
		A type of heat pump that uses the ground, ground water, or ponds as a heat source and heat sink, rather than outside air.
		Geothermal heat pumps (sometimes referred to as GeoExchange, earth-coupled, ground-source, or water-source heat pumps) have been in use since the late 1940s.
		Geothermal heat pumps (GHPs) use the constant temperature of the earth as the exchange medium instead of the outside air temperature.
	www.daviddarling.info /encyclopedia/G/AE_geothermal_heat_pump.html (799 words)

	Ground Loop: Geothermal Explanation
		Every Geothermal Heating and Cooling Systems has three major subsystems or parts: a geothermal heat pump to move heat between the building and the fluid in the earth connection, an earth connection for transferring heat between its fluid and the earth, and a distribution subsystem for delivering heating or cooling to the building.
		In heating mode, the cycle starts as the cold liquid refrigerant within the heat pump passes through a heat exchanger (evaporator) and absorbs heat from the low-temperature source (fluid circulated through the earth connection).
		The key is that geothermal heat pumps use electricity to move heat, not to generate it by the burning fuel or using electric resistance elements.
	www.groundloop.com /geothermal.htm (2034 words)

	BC Hydro - Power Smart at Home - Geothermal Heat Pumps
		Water is pumped from the well through the heat pump's heat exchanger, where heat is extracted and transferred to a refrigerant system.
		The heat pump operates on the principle that heat can be transferred by a cycle of alternating vaporization and condensation, the same cycle used by refrigerators, freezers and air conditioners.
		Instead of absorbing heat from the fluid and transferring it to the indoor air, it now absorbs heat from the indoor air and transfers it to the fluid, where it is given off to the ground or ground water.
	www.bchydro.com /powersmart/elibrary/elibrary685.html (738 words)

	Articles - Geothermal exchange heat pump (Site not responding. Last check: 2007-10-18)
		A geothermal exchange heat pump, also known as a ground source heat pump, is a heat pump that uses the Earth as either a heat source or a heatsink depending on the mode of operation: heating or cooling.
		In the heating mode, the external fluid returns from the earth (heat field) at 8-16 degrees Celsius and passes through the heat exchange unit.
		Within the heat exchanger the internal fluid is allowed to expand and change state into a gas (vaporization) drawing the heat of vaporization from the external fluid.
	www.centralairconditioners.net /articles/Geothermal_exchange_heat_pump (598 words)

	NYSERDA - Geothermal Heat Pumps
		Geothermal heat pumps transfer heat between the constant temperature of the earth and the building to maintain the building's interior space conditions.
		With geothermal heat pump systems, water is circulated between the building and the “ground-loop” piping buried in the ground.
		When the building needs heating, the system extracts heat energy from the ground, and pumps it into the building where it is boosted by the heat pump to a comfortably warm temperature.
	www.nyserda.org /programs/geothermal (997 words)

	Geothermal heating -
		A heat pump uses the extracted water or transfer fluid as a heat source in winter and a heat sink in summer.
		Once this water passes through the heat pump, it is released back to its source, generally as far from the intake as possible.
		Geothermal heating is one of the most efficient ways to heat a building, but it has high initial costs for drilling the wells deep enough into the earth to take advantage of the earth's temperature.
	psychcentral.com /psypsych/Geothermal_heating (445 words)

	ScienceDaily: Geothermal power
		Geothermal power is the use of geothermal heat for electricity generation.
		Geothermal power is more competitive in countries that have limited hydrocarbon resources, such as Iceland, New Zealand, and Italy.
		Heat pump -- A heat pump is a machine which moves heat from a low temperature reservoir to a higher temperature reservoir under supply of...
	www.sciencedaily.com /encyclopedia/geothermal_power (2368 words)

	Geothermal power: Encyclopedia topic (Site not responding. Last check: 2007-10-18)
		Geothermal power is electricity (electricity: A physical phenomenon associated with stationary or moving electrons and protons) generated by utilizing naturally occurring geological (geological: geology (from greek γη- (ge-, "the earth") and λογο&sigmaf;...
		Geothermal heating (Geothermal heating: geothermal heating is a method of heating and cooling a building....
		Geothermal exchange heat pump (Geothermal exchange heat pump: a geothermal exchange heat pump is a heat pump that uses the earth as either a heat...
	www.absoluteastronomy.com /reference/geothermal_power (782 words)

	Geothermal Exchange Heat Pump (Site not responding. Last check: 2007-10-18)
		The length of the pipe varies with the heating or cooling requirements, the soil type, pipe installation layout, and the location of the installation.
		In heating mode, the fluid returns from the earth at 8 degrees Celsius, and the compressor compresses the fluid to increase the heat per unit of volume.
		The fluid is then pumped into the loop external to the house where the fluid deposits the heat in excess of the ambient ground temperature.
	www.wikiverse.org /geothermal-exchange-heat-pump (545 words)

	Assessment of Hybrid Geothermal Heat Pump Systems - Technology Installation Review
		The common denominator is that water source heat pumps exchange heat between indoor air (for space heating or cooling) or water (for heating or chilling water) and a liquid (either water or a water-coolant mixture) flowing in a closed loop.
		Heat exchanger maintenance must be considered, as well as the stability of the missions of the facilities that are the source of the wastewater.
		The building is presently heated and cooled using a combination of steam from a central base steam generating station (for the hangar areas) and water source heat pumps connected to a common building water loop (for the classroom/office area).
	www.pnl.gov /TechReview/hybrid-new/hybrid-ghp.html (6778 words)

	Geothermal Systems (Site not responding. Last check: 2007-10-18)
		Every Geothermal system has three major subsystems or parts: a geothermal heat pump to move heat between the building and the fluid in the earth connection, an earth connection for transferring heat between its fluid and the earth, and a distribution subsystem for delivering heating or cooling to the building.
		In heating mode, heat is extracted from the fluid in the earth connection by the geothermal heat pump and distributed to the home or building -- typically through a system of air ducts.
		Cooler air from the building is returned to the geothermal heat pump, where it cools the fluid flowing to the earth connection.
	www.leucksdrilling.com /pages/2 (469 words)

	Geothermal Heat Pump Consortium, Inc. (Site not responding. Last check: 2007-10-18)
		heat exchanger that uses superheated gases from the heat pump’s compressor to heat water.
		This is important so it doesn’t retard the exchange of heat between the Earth and the fluid in the loop.
		Temperate water from the bottom of the well is withdrawn, circulated through the heat pump’s heat exchanger, and returned to the top of the water column in the same well.
	www.geoexchange.org /about/how.htm (2887 words)

	Geothermal Heat Pumps
		A geothermal heat pump is an electric heat pump that draws heat from or discharges heat to the ground or ground water, instead of air.
		An "open loop" geothermal heat pump uses heat found in rocks or fluids at various depths beneath the surface of the earth, and receives/discharges fluids from the earth.
		A "closed loop" geothermal heat pump pipes a fluid in a closed piping system underground, which receives heat from or discharges heat to the Earth.
	www.eia.doe.gov /cneaf/solar.renewables/page/heatpumps/heatpumps.html (256 words)

	LearnAboutEnergy.Org - Energy Focus - Geothermal!
		Geothermal energy is called a renewable energy source because the water is replenished by rainfall, and the heat is continuously produced within the earth by the slow decay of radioactive particles that occurs naturally in all rocks.
		Geothermal energy is a renewable energy source that does little damage to the environment.
		Geothermal steam and hot water do contain naturally occurring traces of hydrogen sulfide (a gas that smells like rotten eggs) and other gases and chemicals that can be harmful in high concentrations.
	www.learnaboutenergy.org /focus/part10.htm (1859 words)

	EERE: Geothermal Energy - Heat Pumps (Site not responding. Last check: 2007-10-18)
		Geothermal heat pumps use the relatively constant temperature of soil or surface water as a heat source and sink for a heat pump, which provides heating and cooling for buildings.
		These use a buried loop or coil of tubing to exchange heat with the soil in your yard.
		Geothermal heat pumps produce heat more efficiently than furnaces, boilers, and air-source heat pumps.
	www.eere.energy.gov /RE/geo_heat_pumps.html (125 words)

	Sunteq/Enviroteq Geothermal Heat Pumps - About Us
		We felt that the ground source heat pumps on the market were not specifically designed for the application for which they were being installed.
		Units that worked well on closed loops used enormous quantities of water on open loop applications (pumping water from the ground in those large quantities is very expensive) and units that worked well on open loops had too much pressure drop for closed loop operation, requiring two or more circulators that doubled pumping energy costs.
		Heat exchangers used on units that would be performing on closed loops were piped in parallel for minimal pressure drop and maximum water flow rates allowing up to 15 GPM flow utilizing a single circulator and an appropriately designed ground loop.
	www.geothermalheatpump.com /aboutus.htm (428 words)

	Renewable Energy Annual 1996
		District heating systems may deliver heat to the end user after passing the fluid through a central heat exchanger; thus, the geothermal fluid is not actually delivered to the end user.
		A ground-coupled heat pump system begins with the installation of either coils of plastic piping buried 6 to 10 feet in the earth, long runs of tubing in trenches, or similar piping under the freeze level of a pond or lake.
		The heat pump itself operates on the same principal as the home refrigerator, which is actually a one-way heat pump.
	www.eia.doe.gov /cneaf/solar.renewables/renewable.energy.annual/chap04.html (2211 words)

	CDA Press Releases: January 14, 2000 - New ARI Standard Published for Testing and Rating Direct-Exchange Geothermal ...
		A compressor induces heat exchange, and heated or cooled air is distributed through an air handler.
		Once the refrigerant reaches the heat pump, which is situated inside the home, the compressor concentrates and delivers the heat.
		Direct-exchange geothermal heating and cooling systems are generally regarded as energy efficient and inexpensive to operate because they burn no fuel and consume no energy beyond the electricity required to operate the compressor and the fan used to circulate the air.
	www.copper.org /about/pressreleases/2000/ARIStandard.html (581 words)

	GEOTHERMAL HEAT PUMP Central - Find great websites with information on 'geothermal heat pump' and related information. (Site not responding. Last check: 2007-10-18)
		Geothermal heat pumps are similar to ordinary heat pumps,...
		Geothermal Eduation Office exists to ascertain that citizens of both today and tomorrow understand what geothermal energy is, what it can do, and its growing place in providing the clean energy necessary to protect our environment while providing...
		heat from the geothermal heat pump's compressor to the house's hot water tank.
	www.g3labs.com /search/_xml/g/e/geothermal-heat-pump.html (644 words)

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