| 单词 | heat engine |
| 例句 | “You can think of a hurricane as a heat engine where the ocean is the fuel … so giving it warmer water is basically like higher-octane fuel,” Hazelton said. Why Idalia intensified so quickly, and why that may be the new normal 2023-09-04T04:00:00Z This chapter discusses thermodynamics in practical contexts including heat engines, heat pumps, and refrigerators, which support Big Idea 4, and that interactions between systems can result in changes in those systems. College Physics for AP Courses 2015-08-12T00:00:00Z Hurricanes are heat engines, extracting thermal energy from “oceanic heat content.” NOAA forecasts seventh straight busy Atlantic hurricane season 2022-05-24T04:00:00Z “Over the ocean, because the moisture supply is there for the heat engine, you’re constantly stirring the tea,” he said. Warming May Make Hurricanes Weaken More Slowly After Landfall 2020-11-11T05:00:00Z “A hurricane is a heat engine,” he said. In North Carolina, hurricanes can be 'a tragedy or a lesson' 2018-09-13T04:00:00Z Required by the second law of thermodynamics, that unavoidable waste of energy severely limits the efficiency of a heat engine to below a level set by the temperatures of the baths. Quantum measurements could power a tiny, hyper-efficient engine 2018-07-10T04:00:00Z Such a device is called a heat engine. College Physics for AP Courses 2015-08-12T00:00:00Z Physicists have made ‘quantum heat engines’ — that can turn heat into work at the quantum level5. Battle between quantum and thermodynamic laws heats up 2017-03-28T04:00:00Z A hurricane is essentially a heat engine, a rotating storm fueled by moisture from the warm ocean. Warming May Make Hurricanes Weaken More Slowly After Landfall 2020-11-11T05:00:00Z “That heat engine drives plate tectonics, the creation and destruction of the surface of our planet.” What 50 Years of Earthquakes and Volcanic Eruptions Look Like 2016-10-10T04:00:00Z They are central parts of a planetary heat engine that continually rearranges the Earth’s two dozen or so large crustal plates. Richard P. Von Herzen, Explorer of Earth’s Undersea Furnaces, Dies at 85 2016-02-08T05:00:00Z Figure 15.8 Schematic representation of a heat engine, governed, of course, by the first law of thermodynamics. College Physics for AP Courses 2015-08-12T00:00:00Z Now, physicists in Germany have made what could be the world’s smallest heat engine using just a single particle: an ion of calcium. Scientists build heat engine from a single atom 2015-10-21T04:00:00Z That temperature change, and the expansion of the nitrogen it causes, is enough to do work equivalent to a more conventional heat engine—but not, sadly, much better than such an engine. Cool thinking 2015-05-07T04:00:00Z The report looks at how the atmosphere works as a heat engine, shifting heat from the sun from the tropics towards the poles. Storms like U.S. blizzard may get stronger but less frequent: study 2015-01-29T05:00:00Z Commonwealth Bay is one of the metaphorical cylinders of the great heat engine of the global ocean system. Christmas in Antarctica's pack ice 2013-12-26T11:00:40Z Variations of this process are employed daily in hundreds of millions of heat engines. College Physics for AP Courses 2015-08-12T00:00:00Z He adds that the work "provides a way to study the ultimate and fundamental limits of the application of heat engines." Scientists build heat engine from a single atom 2015-10-21T04:00:00Z In summer this plateau acts as a huge heat engine, absorbing solar energy which it transfers to the atmosphere, causing immense convection currents. How Climate Change and Plate Tectonics Shaped Human Evolution 2013-11-14T16:45:00.360Z There is no such thing as a perfect heat engine; you’ll always lose some heat in the process. Maxwell's Demon Meets Quantum Dots 2013-02-18T21:45:00.260Z Science in the mid 19th century was much occupied with matters concerning work and energy, and the efficiency of heat engines. The Age of the Earth--An Age-Old Question [Excerpt] 2013-01-25T15:15:01.550Z We will examine heat engines in detail in the next section. College Physics for AP Courses 2015-08-12T00:00:00Z Taylor says it will be interesting to see how the quantum-mechanical behavior of tiny heat engines differs from the “classical” physics that governs familiar engines. Scientists build heat engine from a single atom 2015-10-21T04:00:00Z The ultimate efficiency limit in the conversion of sunlight energy to electrical energy is determined by a Carnot heat engine. Opportunities and challenges for a sustainable energy future 2012-08-15T17:21:52.727Z Thus Joule was in possession at an earlier date than Thomson of the fundamental notion upon which the true dynamical theory of heat engines is founded. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z In the same press release, researcher Clemens Bechinger adds, ”Our experiments provide us with an initial insight into the energy balance of a heat engine operating in microscopic dimensions. Researchers Build A One Particle Steam Engine 2011-12-12T05:59:40Z In this section, we consider some of the simpler underlying processes on which heat engines are based. College Physics for AP Courses 2015-08-12T00:00:00Z The efficiency of any heat engine is proportional to the power developed from a definite quantity of fuel with the least loss of thermal units. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z Electricity is then generated at about 30–35% efficiency using a heat engine. Opportunities and challenges for a sustainable energy future 2012-08-15T17:21:52.727Z Thus in his theory as much heat was given up by a heat engine to the body at the lower temperature as was received by it from the source. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z See: http://www.worldbiofuelsmarkets.com/ Rossi is an accomplished engineer and entrepreneur in energy, heat engines and catalysts. National Instruments and Cold Fusion? 2011-11-11T23:04:41Z We will find that heat engines with the greatest possible theoretical efficiency would have to use reversible processes, and even they cannot convert all heat transfer into doing work. College Physics for AP Courses 2015-08-12T00:00:00Z The efficiency of any form of heat engine is determined by the power obtained from a certain fuel consumption. Aviation Engines Design?Construction?Operation and Repair 2011-12-04T03:00:04.777Z As far back as 130 B.C., we find mention of "heat engines," which employed steam as their motive power, and were used for organ blowing, the turning of spits, and like purposes. Great Inventions and Discoveries 2011-10-01T02:00:30.900Z Numerical results deduced from Regnault's experiments on steam were included; and the memoir as a whole led naturally in Thomson's hands to a corrected theory of heat engines, which he published in 1852. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z The monsoon winds themselves are driven by what is essentially a large heat engine, says climate scientist Yi Ming of the Geophysical Fluid Dynamics Laboratory/NOAA in Princeton, New Jersey. Aerosols Altered Asian monsoons 2011-09-29T19:00:00Z A coal-fired power station is a huge heat engine. College Physics for AP Courses 2015-08-12T00:00:00Z But it is one thing to show that the instrument is a heat engine, and quite another thing to explain in detail the manner in which it acts. Scientific Culture, and Other Essays Second Edition; with Additions 2011-09-17T02:00:31.747Z A gas engine is a heat engine in which the working fluid is atmospheric air and the fuel an inflammable gas. Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 4 "G" to "Gaskell, Elizabeth" 2011-08-24T02:00:20.690Z Carnot's view of the working of a heat engine was founded on the analogy of the performance of work by a stream of water descending from a higher level to a lower. Lord Kelvin An account of his scientific life and work 2012-04-06T02:00:32.097Z Human beings are practically heat engines, and we keep on manufacturing heat all the time. Religion And Health 2011-08-12T02:00:18.323Z In the next section, we shall see what the absolute limit to the efficiency of a heat engine is, and how it is related to temperature. College Physics for AP Courses 2015-08-12T00:00:00Z What each one should consume is eminently individual, depending altogether on the sort of heat engine that each one is. Psychotherapy 2011-06-19T02:00:20.053Z In heat engines, energy in the form of heat is converted into mechanical energy. The New Gresham Encyclopedia Volume 4, Part 2: Ebert to Estremadura 2011-04-14T02:00:56.200Z Energy presents itself to us as the product of two factors, weight and height in the waterfall, quantity and temperature in the heat engine, current intensity and potential in the electric motor. The Mechanism of Life The principal uses of asbestos are in high-pressure packing in heat engines, in thermal and electrical insulation, in fire-proofing, and in brake-band linings. The Economic Aspect of Geology We know from the second law of thermodynamics that a heat engine cannot be 100% efficient, since there must always be some heat transfer Qc to the environment, which is often called waste heat. College Physics for AP Courses 2015-08-12T00:00:00Z Some must eat much more than others to keep up their weight and strength, because they are wasteful heat engines. Psychotherapy 2011-06-19T02:00:20.053Z In his time heat engines were not yet very common, and no one had reflected much on their theory. The New Physics and Its Evolution Such a temperature would be quite incompatible with the integrity of living tissues, and we may therefore conclude that the human organism is not a heat engine. The Mechanism of Life Similarly the name "Gas Engine" masks the fact of the motors so called being really fire or heat engines. Scientific American Supplement, No. 484, April 11, 1885 The actual reservoir temperatures of a heat engine are usually related to the type of heat source and the temperature of the environment into which heat transfer occurs. College Physics for AP Courses 2015-08-12T00:00:00Z Thus for the first time is pointed out the true reason why compound engines are economical heat engines. Scientific American Supplement, No. 520, December 19, 1885 This was Watt's guiding principle, as it has been that of all his successors in the improvement of the economic performance of the steam engine and of all other heat engines. Scientific American Supplement, No. 803, May 23, 1891 If I am not mistaken the electric-engine will soon entirely drive out the "heat engine" just as in the olden days the more highly-organised prehistoric animals drove out their less efficient neighbours. The Story of Mankind Considered as a heat engine, the gas engine is now twice as efficient as the very best modern steam engine. Scientific American Supplement, No. 484, April 11, 1885 Even with the best heat engine possible, there are always dissipative processes in peripheral equipment, such as electrical transformers or car transmissions. College Physics for AP Courses 2015-08-12T00:00:00Z A machine that uses heat transfer to do work is known as a heat engine. College Physics for AP Courses 2015-08-12T00:00:00Z These were the two great improvements which converted the first real steam engine into an economical form of heat engine and essentially finished the work so grandly begun by Newcomen and Calley. Scientific American Supplement, No. 803, May 23, 1891 Is a temperature difference necessary to operate a heat engine? College Physics for AP Courses 2015-08-12T00:00:00Z Can improved engineering and materials be employed in heat engines to reduce heat transfer into the environment? College Physics for AP Courses 2015-08-12T00:00:00Z We say backward, rather than reverse, because except for Carnot engines, all heat engines, though they can be run backward, cannot truly be reversed. College Physics for AP Courses 2015-08-12T00:00:00Z Any heat engine using reversible processes and operating between these two temperatures will have the same maximum efficiency as the Carnot engine. College Physics for AP Courses 2015-08-12T00:00:00Z Figure 15.28 Heat pumps, air conditioners, and refrigerators are heat engines operated backward. College Physics for AP Courses 2015-08-12T00:00:00Z There are several simple processes, used by heat engines, that flow from the first law of thermodynamics. College Physics for AP Courses 2015-08-12T00:00:00Z Explain, in terms of heat engines and the first law of thermodynamics, why or why not such a machine is likely to be constructed. College Physics for AP Courses 2015-08-12T00:00:00Z The energy that could have been used to run a heat engine is now unavailable to do work. College Physics for AP Courses 2015-08-12T00:00:00Z Compare the definitions of efficiency for the human body and heat engines. College Physics for AP Courses 2015-08-12T00:00:00Z Why—other than the fact that the second law of thermodynamics says reversible engines are the most efficient—should heat engines employing reversible processes be more efficient than those employing irreversible processes? College Physics for AP Courses 2015-08-12T00:00:00Z Car engines and steam turbines that generate electricity are examples of heat engines. College Physics for AP Courses 2015-08-12T00:00:00Z Figure 15.8 shows schematically how the first law of thermodynamics applies to the typical heat engine. College Physics for AP Courses 2015-08-12T00:00:00Z Eventually, all fuels will be exhausted, all temperatures will equalize, and it will be impossible for heat engines to function, or for work to be done. College Physics for AP Courses 2015-08-12T00:00:00Z When we study this law, we will learn something about nature and also find that such a law limits the efficiency of heat engines. College Physics for AP Courses 2015-08-12T00:00:00Z Gasoline and diesel engines, jet engines, and steam turbines are all heat engines that do work by using part of the heat transfer from some source. College Physics for AP Courses 2015-08-12T00:00:00Z Most heat engines, such as reciprocating piston engines and rotating turbines, use cyclical processes. College Physics for AP Courses 2015-08-12T00:00:00Z The four steps shown complete this heat engine's cycle, bringing the gasoline-air mixture back to its original condition. College Physics for AP Courses 2015-08-12T00:00:00Z Second, once the two masses of water are mixed, there is only one temperature—you cannot run a heat engine with them. College Physics for AP Courses 2015-08-12T00:00:00Z How efficient, then, can a heat engine be? College Physics for AP Courses 2015-08-12T00:00:00Z Any heat engine employing the Carnot cycle is called a Carnot engine. College Physics for AP Courses 2015-08-12T00:00:00Z Carnot also determined the efficiency of a perfect heat engine—that is, a Carnot engine. College Physics for AP Courses 2015-08-12T00:00:00Z No real heat engine can do as well as the Carnot efficiency—an actual efficiency of about 0.7 of this maximum is usually the best that can be accomplished. College Physics for AP Courses 2015-08-12T00:00:00Z |
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