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Topic: Heat pump

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	Heat Pump
		A heat pump is subject to the same limitations from the second law of thermodynamics as any other heat engine and therefore a maximum efficiency can be calculated from the Carnot cycle.
		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.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/heatpump.html (0 words)

	Geothermal Heat Pumps.
		A heat pump is a machine which causes the heat to flow in a direction opposite of its natural tendency or "uphill" in terms of temperature.
		One of the most important characteristics of heat pumps, particularly in the context of home heating/cooling, is that the efficiency of the unit and the energy required to operate it are directly related to the temperatures between which is operates.
		In heat pump terminology, the difference between the temperature where the heat is absorbed (the "source") and the temperature where the heat is delivered (the "sink") is called the "lift." The larger the lift, the greater the power input required by the heat pump.
	www.soundgt.com /pumps.htm (754 words)

	Heat pump - Wikipedia, the free encyclopedia
		A heat pump is a machine which moves heat from a low temperature reservoir to a higher temperature reservoir under supply of work.
		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).
		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 (1229 words)

	Geothermal exchange heat pump - Wikipedia, the free encyclopedia
		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, when operating in heating mode, or a heat sink when operating in cooling mode.
		All geothermal heat pumps are characterised by an external loop containing water or a water/antifreeze mixture (propylene glycol, denatured alcohol or methanol), and a much smaller internal loop containing a refrigerant.
		The heat is being pumped from the air in the house to the water in the water heater.
	en.wikipedia.org /wiki/Geothermal_exchange_heat_pump (953 words)

	air-source heat pump
		This is distinct from, say, a geothermal heat pump or a water-source heat pump where the heat source or sink is something other than air, such as the earth or a pond.
		Heating efficiency for air-source electric heat pumps is indicated by the heating season performance factor (HSPF), which is the ratio of the seasonal heating output in BTU divided by the seasonal power consumption in watts.
		The heat pump is connected to a large, heavily insulated tank of water that the heat pump heats or cools, depending on the season of the year.
	www.daviddarling.info /encyclopedia/A/AE_air-source_heat_pump.html (2091 words)

	Understanding Heat Pumps, Selecting a Heat Pump, - ACU Air Heating and Air Conditioning - Our Heat Pump Certified ...
		Because heat pumps are used year round (for cooling as well as heating needs), they cost less per hour of use (cost of purchase and installation divided by total number of hours used per year) than do individual heating and cooling systems, which each sit idle for a good part of the year.
		The heat pump serves as a heater by absorbing heat from outdoor air and pumping it indoors.
		The HSPF (Heating Seasonal Performance Factor) rating is used to identify the heating efficiency of heat pumps: the higher the rating, the less electricity the heat pump uses to heat a given area.
	www.flex.net /~lonestar/hpumps.htm (1197 words)

	Heat Pump (Site not responding. Last check: )
		A heat pump is a refrigeration system that has the capability of being used for both cooling and heating.
		This is accomplished by reversing the direction of the flow of the refrigerant inside the heat pump, essentially reversing the cycle.
		Heat pumps are not efficient is cooling large spaces such as office buildings.
	www.pages.drexel.edu /~cmh32/aed1/hvac/heat_pump.htm (813 words)

	What's A Heat Pump? (Site not responding. Last check: )
		A heat pump is an air conditioner capable of also providing heating for your home by reversing the normal flow of refrigerant (freon) within the system.
		To supplement the heating capacity of the heat pump, electric resistance heating elements are used and automatically engage via the thermostat when this condition occurs.
		Heat pumps reduce the amount of fossil fuel that needs to be burned to keep homes warm or cooled, thereby decreasing the amount of pollutants entering the earth's atmosphere.
	www.climatemagic.com /heatpump.html (1147 words)

	Heating and Cooling with a Heat Pump
		A ground-source heat pump uses the earth or ground water or both as the sources of heat in the winter, and as the "sink" for heat removed from the home in the summer.
		Heat is removed from the earth through a liquid, such as ground water or an antifreeze solution, upgraded by the heat pump, and transferred to indoor air.
		In the heating cycle, the ground water, the antifreeze mixture, or refrigerant (which has circulated through the underground piping system and picked up heat from the soil), is brought back to the heat pump unit inside the house.
	oee.nrcan.gc.ca /publications/infosource/pub/home/Heating_and_Cooling_with_a_Heat_Pump_Section4.cfm (2408 words)

	HEAT PUMPS - Heat Pump Air Conditioning Christchurch New Zealand.
		Heat pumps are a proven way to keep your home warm in winter and cool in summer.
		The heat transfer fluid (refrigerant) used is at such a low temperature it boils at minus 40 deg - that even on the coldest winter's day, heat is absorbed and transferred indoors.
		Heat pumps create a safe, healthy energy efficient and comfortable environment for your home and will pay for themselves in the long run.
	www.heatpumpac.co.nz /heat-pumps/heat-pumps.php (316 words)

	How does a heat pump work?
		Most of the heat pumps now in existence are at a critical stage in their life.
		Heat pumps are designed to warm in winter and cool in summer.
		It uses water as it source of heat in the winter and water as a method of cooling the heat removed from a house in the summer.
	www.grassroots.ca /homeowner_help_articles/heat_pumps_v2.html (743 words)

	EERE Consumer's Guide: Heat Pump Systems
		During the heating season, heat pumps move heat from the cool outdoors into your warm house; during the cooling season, heat pumps move heat from your cool house into the warm outdoors.
		In addition, a special type of air-source heat pump called a "reverse cycle chiller" generates hot and cold water rather than air, allowing it to be used with radiant floor heating systems in heating mode.
		Absorption heat pumps use heat as their energy source, and can be driven with a wide variety of heat sources.
	www.eere.energy.gov /consumer/your_home/space_heating_cooling/index.cfm/mytopic=12610 (0 words)

	Heat Harvester - Water Source Heat Pump Information.
		During the cooling mode, the tube-in-tube heat exchanger functions as a condenser and the coil as an evaporator.
		In the heating mode, the tube-in-tube heat exchanger functions as an evaporator and the coil as a condenser.
		Heat pump units are installed inside the building; they aren't exposed to the weather.
	www.heatharvester.com /Water-Source-intro.htm (416 words)

	Heat Pump as a System
		A heat pump is a very efficient cooling system; however its heating effectiveness is not as good.
		In this case a secondary heating source is usually installed to supply the additional heat to the space.
		The upper two curves assume that space heating is provided by electric resistance heat and the lower two curves assume that space heat is provided by a heat pump.
	www.pages.drexel.edu /~bjc26/heatpump.htm (937 words)

	Heat Pump Thermostat - Programmable Honeywell Heat Pump Thermostats
		Heat Pump Thermostat - Programmable Honeywell Heat Pump Thermostats
		A multistage heat pump is a heat pump with auxiliary heat or emergency heat; this acts as a backup when the temps really drop.
		These thermostats are great as Trane heat pump thermostats, Carrier heat pump thermostats, Lennox heat pump thermostats, GE heat pump thermostats and for any other multistage heat pump on the market.
	www.honeywell-thermostat.com /heat-pump.html (252 words)

	John Cantor Heat Pumps Machynlleth UK (Site not responding. Last check: )
		In heating applications, heat pumps save energy by extracting heat from a natural or waste source, using a mechanism similar to that found in a refrigerator.
		This apparently magical technology is not new: in the 1950's several heat pumps were installed in a bid to save energy and fuel costs.
		Here heat is extracted from the cabinet to keep food fresh and the extracted heat is expelled through the radiator grill at the back of the unit.
	www.heatpumps.co.uk /whatis.htm (475 words)

	heat pump repair and service without cost of replacement
		If heat pumps had two speed compressors and were sized for twice the cooling need then this would be less of a problem.
		Reason 4: Heat pumps loose their effectiveness (not to be confused with efficiency) the colder it gets outside forcing you to either use the electric heat or stay cold.
		Reason 7: If you have had oil or gas forced air in the past you may think that there is something wrong with your heat pump unit because the temperature of the discharge air is not as warm.
	www.toad.net /~jsmeenen/heatpump.html (0 words)

	Heat Pump Water Heaters
		Heat pump water heaters come either self contained with a storage tank, or as an add on unit using a conventional water heater for storage.
		Typical heat pump water heaters consume one half to one third as much electricity as a typical electric water heater.
		Heat pump water heaters are more expensive that conventional water heaters, generally $600 to $800 installed.
	www.chilipepperapp.com /hpwh.htm (209 words)

	SRP: Electric heat pump facts
		A heat pump is highly efficient because it doesn't manufacture the heat it distributes.
		A heat pump can save you as much as 30% on heating costs when compared to a gas furnace and provides year-round comfort.
		Furthermore, an electric heat pump has no open flame to worry about, so there is no possibility of fuel leaks or carbon monoxide poisoning.
	www.srpnet.com /energy/heatpump.aspx (478 words)

	Electric Heat Pump
		A heat pump is a year-round comfort conditioning system that uses refrigeration equipment to supply warm air in winter and cool air in summer.
		Heat pumps are growing in popularity because higher energy costs and chances of future fuel shortages have led homeowners to seek ways to reduce their heating and cooling costs.
		An "air-to-air" heat pump has two parts--and indoor unit with a coil and a blower that pushes the warm or cool air through your house (like a standard furnace); and an outdoor unit with another coil, fan and a compressor or pump (like a standard air conditioner).
	www.nppd.com /My_Home/Product_Brochures/Additional_Files/heat_pump.asp (761 words)

	Member Center>> Heat Pump
		By definition, a heat pump is a machine, which moves heat.
		The Balance Point is some outside air temperature at which the Heat Pump exactly supplies the same amount of heat (BTU's) that the home requires to satisfy the thermostat.
		Using a Heat Pump at this fuel cost means that a home would have to buy propane at $0.55/gallon to match it in operating costs.
	www.central.coop /heatpump.asp (385 words)

	Geothermal heat pump analysis article
		The heat pump transfers heat to a space to be heated during the winter period and by reversing the operation, extracts (absorbs) heat from the same space to be cooled during the summer period.
		The heat pump does not have to work as hard to extract heat from or move heat to the ground or groundwater at a moderate temperature as from the cold air in winter or to the hot air in summer.
		At the heat pump, heat is drawn from or dumped to the closed loop solution via heat transfer through a heat exchanger, which then passes heat to or removes heat from the refrigerant in the heat pump.
	www.eia.doe.gov /cneaf/solar.renewables/rea_issues/html/geotsurv.html (4507 words)

	Howstuffworks "How does a heat pump work?"
		A heat pump is an air conditioner that contains a valve that lets it switch between "air conditioner" and "heater." When the valve is switched one way, the heat pump acts like an air conditioner, and when it is switched the other way it reverses the flow of Freon and acts like a heater.
		Heat pumps can be extremely efficient in their use of energy.
		To avoid pumping cold air into the house in air conditioner mode, the heat pump also lights up burners or electric strip heaters to heat the cold air that the air conditioner is pumping out.
	www.howstuffworks.com /question49.htm (280 words)

	Heat Pump Water Heaters
		The heat pump can be integrated with or separate from the hot water storage tank, and cool exhaust air can be exhausted to the room or to the outdoors (see Figures).
		Heat pump water heaters are most cost effective in warm climates with long cooling seasons and in homes with high water use.
		Heat pump water heaters that draw room air must be located in a room large enough to prevent over-cooling of the space.
	www.toolbase.org /Technology-Inventory/Plumbing/heat-pump-water-heaters (687 words)

	Heat Pump
		Like a water pump that uses energy to pump water uphill, a heat pump uses electrical energy to pump heat "uphill" from cool locations to warmer locations.
		Heat pumps use the refrigeration cycle to accomplish this.
		The Oregon state energy tax credit for heat pumps comes from the Oregon Department of Energy, which maintains a list of approved contractors that have the appropriate certifications necessary to install a heat pump that will qualify you for the tax credit.
	www.energytrust.org /residential/hes/heat_pump_faq.html (727 words)

	NYSERDA - Geothermal Heat Pumps (Site not responding. Last check: )
		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.
		Conversely, when the building needs cooling, the heat from the building is collected by the heat pumps and sent into the ground, much as a refrigerator's compressor transfers heat from inside the refrigerator to the outside.
	www.nyserda.org /programs/geothermal/default.asp (1094 words)

	Heating and Cooling with a Heat Pump
		Heat is removed from the earth by using a liquid, such as ground water or an antifreeze solution; the liquid's temperature is raised by the heat pump; and the heat is transferred to indoor air.
		Excess heat is always available in the summer cooling mode, and is also available in the heating mode during mild weather when the heat pump is above the balance point and not working to full capacity.
		Since earth-energy heat systems have both COP and EER standard performance ratings, it was necessary to calculate heating seasonal performance to compare operating costs with those of air-source heat pumps.
	oee.nrcan.gc.ca /publications/infosource/pub/home/heating-heat-pump/gsheatpumps.cfm (3676 words)

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