Education and government credit union matt lafleur education blogging to…
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We consider the standard Carnot-cycle machine, which can be thought of…

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Given all the attention being paid to solar power these days, you might be surprised to learn that one of the most promising solutions to high energy costs isn t up in the sky but buried deep under your lawn. Superefficient geothermal heat pumps provide clean, quiet heating and cooling while cutting utility bills by up to 70 percent. With this technology, everybody could be…
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A test of compressor performance was done under high temperature and pressure. • Performance of high temperature heat pump with BY-4 was studied and analyzed. • The highest heat output temperature is 110 °C with high COP of 3.61. • The maximum pressure is only 1.73 MPa when the output temperature rises up to 110 °C. A near-azeotropic refrigerant mixture named BY-4 was developed…
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Triple-D Coil Cleaner is a 19oz Aerosol spray can, that is safe for homeowner use. One can will clean an entire Outdoor condesor coil and/or indoor evaporator coil, to remove energy stealing dirt, debris and soot. Manufacturer #Triple-D-AER TRIPLE-D™ is a triple active synergistic detergent system formulated to remove a broad range of soils with minimal time and effort. It…
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This paper compares the effects of two different refrigerant flow modeling assumptions on the transient performance of vapor-compression heat pump cycles. These simulations are developed in the next-generation modeling language Modelica, which uses an acausal, equation-oriented approach to describe physical systems. The effect of the flow assumptions and specific slip ratio…
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A heat pump is a machine that moves heat from a cold place to a hot place. Some buildings are heated with heat pumps, also. In the winter, the heat pump moves heat from the outside to the inside. Sometimes this works better than heating with a radiator. Usually, heat flows from a hot place to a cold place, according to the second law of thermodynamics. Heat will not move from…
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Video: Paul Ledman s net-zero apartment building in Portland, Maine which uses 100% solar for heating and cooling and will never need fossil fuel inputs. Reduce your reliance on dirty, expensive oil heat with efficient heat pump heating technology. Modern ductless, mini-split air source heat pumps (ASHPs) run 2-3x as efficiently as traditional resistive electric heat, making…
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So, you ve got a heating and cooling system in your home. There s a metal box outside that makes noise, and you control it with the thermostat on the wall. Can you tell me right now whether it s a heat pump or just an air conditioner? This is a really important question to be able to answer when you re talking to an engineer or contractor at a cocktail party. The diference…
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Abstract: The conventional control paradigm for a heat pump with a less efficient auxiliary heating element is to keep its temperature set point constant during the day. This constant temperature set point ensures that the heat pump operates in its more efficient heat-pump mode and minimizes the risk of activating the less efficient auxiliary heating element. As an alternative…
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Occasionally I get asked if it s OK to put the condensing unit for an air conditioner or heat pump in a garage or other room that s a buffer space. The thinking is that since the temperature may not be as hot in summer or as cold in winter, the system will operate more efficiently. I just saw yesterday that this same question came up in a column in Home Power magazine, so I…
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Volts 120V, 240/208V Wattage 500/375W Warranty 1-year warranty on complete unit Available in North America Controls Built-in adjustable bi-metallic thermostat. (7° to 25°C / 45° to 77°F) Finish Polyester/epoxy powder coating Heating Element Exclusive coast aluminum heating grid. Approvals Construction The heater wiring and control enclosure are of heavy gauge steel Colour Applications…
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THE PRODUCT: Central air conditioners and heat pumps utilize a large compressor unit located outdoors to distribute cooled or heated air through a forced-air system. In a central air conditioning unit, the compressor cycles air from indoors over a coil filled with refrigerant to cool the inside. Heat pumps, on the other hand, are two-way air conditioners. While heat pumps can…
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Thomas Simon has been trying to cut back on fossil fuels. He weatherized his home and added a wood stove. But in the dead of a Vermont winter, Simon still had to rely on an oil burner to get through those cold nights and days. But now he has found something that suits his environmental beliefs and is much easier on his household budget: heat pumps. Once an expensive add-on…
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Geothermal Heating and Cooling is often referred to as Geoexchange, Geothermal, or Ground Source Heating and Cooling. They all mean the exact same thing, so don’t get confused by these names being interchanged. We are NOT talking about geothermal power (involving power plants generating electricity). Geothermal heating & cooling is not to be confused with a geothermal power…
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1) What is a Heat Pump ? A heat pump is a device that is able to transfer heat from one fluid at a lower temperature to another at a higher temperature. Heat pumps owe their name to the fact that they allow heat to be carried from a lower to a higher temperature level, inverting natural heat flow which - as is well known - in nature tends to be from a higher to a lower temperature…
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A Trane Axiom™ water-source heat pump (WSHP) delivers high-performance heating and cooling with exceptional efficiency: up to 40 EER on select systems. Advanced technology makes a Trane Axiom water-source heat pump easy to operate and maintain, resulting in optimal comfort and long-lasting durability. The broad range of products suit a variety of applications: schools, office…
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Comfort Plus System Installed with a Heat Pump Heat pump systems are one of the most efficient methods of heating and cooling. Utilizing a Comfort Plus unit with a heat pump allows the heat pump s high efficiency to be combined with off-peak electric rates making this heating and cooling system the lowest operation cost option. In addition, the Comfort Plus unit ensures comfort…
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According to the U.S. Department of Energy, roughly 41% of the energy consumed in the U.S. is used the power buildings. Within that number, almost half is used to heat or cool the building. Current technologies allow for consistent thermal management, but most utilize energy harvested from fossil fuels or convert electricity back into thermal energy. Background literature shows…
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An air-source heat pump can provide efficient heating and cooling for your home, especially if you live in a warm climate. When properly installed, an air-source heat pump can deliver one-and-a-half to three times more heat energy to a home than the electrical energy it consumes. This is possible because a heat pump moves heat rather than converting it from a fuel like combustion…
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By This is a good guest post one of our regular readers passed along to me. Good explanation of how geothermal heat pumps work (briefly) and how to go about getting one. Full repost below : (NAPSI)—Homeowners who are planning to replace a worn-out, inefficient heating and cooling system may want to consider installing a new geothermal system. According to the experts at WaterFurnace…
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