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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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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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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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