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We consider the standard Carnot-cycle machine, which can be thought of as having a piston moving within a cylinder, and having the following characteristics: A perfect seal, so that no atoms escape from the working fluid as the piston moves to expand or compress it. Perfect lubrication, so that there is no friction. An ideal-gas for the working fluid. Perfect thermal connection…
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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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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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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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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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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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In my quest to educate the world on building science topics, I find that I often have to go back to basics. Whether it s the basic nature of heat, why we re using the wrong quantity to characterize infiltration rates, or the reason that the media s focus on caulking windows drives me crazy, I try to find the fundamental issues involved and explain them in terms that are easy…
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What kind of heating system makes sense these days? There is so much hype about geothermal heating and cooling systems these days; there is even talk of declaring Oct. 20 to be National Geothermal Day, “to raise awareness about environmental and economic benefits of geothermal energy and its vital role in building a clean and secure energy future.” This is the first problem…
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Efficiency Maine is now offering $500 rebates through the Home Energy Savings Program on the installation of eligible high efficiency ductless heat pumps. Click here for Eligibility Criteria and Units. Word is spreading quickly about how this exciting new technology is able to extract heat from outdoor air (even when it is very cold) and deliver heat energy into homes. There…
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Lead Performer: Thermolift - Stony Brook, NY Partners: - New York State Energy Research & Development Authority - Albany, NY - Stony Brook University - Stony Brook, NY - Oak Ridge National Laboratory - Oak Ridge, TN - National Grid - Washington, DC - Applied Thermodynamic Apparatus (ATA) - Ann Arbor, MI - Fala Technologies - Kingston, NY - LoDolce - Saugerties, NY DOE…
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One great way to get more efficient heating and cooling in your home is with a heat pump. But don t think heat pumps are just for heating. Many can be used for both heating and air conditioning. In fact, many ductless mini-split air conditioning units also operate as heat pumps. A heat pump is equipment that uses a refrigerant to move heat from one place to another. During…
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One of the main reasons that homeowners have heat pumps installed in the first place is because they provide a fantastic “two-in-one” package deal: an air conditioner and a heating system. It only takes a single adjustment on a thermostat to change a heat pump from heating mode to cooling mode and vice versa . But are heat pumps equally effective at heating as they are at cooling?…
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Should you use natural gas heating rather than a heat pump in your home? Some say the interest in heat pumps is fueled by irrational exuberance. Others say that because they require supplemental heat, heat pump performance is not acceptable. Another group says you ll get a better HERS Index by using gas heat. So how s a person to decide? Some of the folks who say these things…
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When matched with a variable speed indoor unit from Trane, the XL20i has another special feature. Its a method of enhancing airflow that we call Comfort-R™ and it gives you greater humidity control in cooling. This is accomplished by running the fan at a slower speed during start-up. Comfort-R™ also provides warmer air during heating start-up. These managed cycles reduce temperature…
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Because of these concerns, the governments of Canada and the United States, along with representatives of other countries, have signed an agreement to phaseout the production and use of HCFC. The phaseout timetable, which actually began over 10 years ago, takes place in stages, with a critical milestone coming at the beginning of 2010. After January 1, 2010, manufacturers can…
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Heat pumps are the most efficient form of electric heating in moderate climates, providing up to three times more heat than the energy they use. Today s heat pump can reduce your electricity use for heating by approximately 50% compared to electric resistance heating such as furnaces and baseboard heaters. A heat pump does double duty as a central air conditioner by collecting…
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Whether you are planning to install, or have made your mind up to install, either a ground or air source heat pump there are still a fair number of integration points to consider, and of course there are often numerous other build related concerns too. But have you ever stopped to fully consider what is powering this fancy low carbon technology. Well some will roll their eyes…
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