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	NationMaster - Encyclopedia: Heat engine
		Heat is transferred from the source, through the "working body" of the engine, to the sink, and in this process some of the heat is converted into work by exploiting the properties of a working substance (usually a gas or liquid).
		In engineering and thermodynamics, a heat engine performs the conversion of heat energy to mechanical work by exploiting the temperature gradient between a hot "source" and a cold "sink".
		Heat engines such as automobile engines operate in a cyclic manner, adding energy in the form of heat in one part of the cycle and using that energy to do useful work in another part of the cycle.
	www.nationmaster.com /encyclopedia/Heat-engine (675 words)

	Heat Engines
		A heat engine typically uses energy provided in the form of heat to do work and then exhausts the heat which cannot be used to do work.
		One of the general ways to illustrate a heat engine is the energy reservoir model.
		The engine takes energy from a hot reservoir and uses part of it to do work, but is constrained by the second law of thermodynamics to exhaust part of the energy to a cold reservoir.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/heaeng.html (562 words)

	Halfbakery: Isothermal bubble pump heat engine
		It comprises a hot heat source, cold heat sink, many identical cleverly shaped loops of sealed tube containing alternating slugs of a heavy liquid and the working gas threaded through the heat source, heat exchanger, and heat sink, and finally, a means for extracting energy from the motion of the liquid.
		Isobaric (constant pressure) heating occurs in a horizontal segment of tube at the maximum depth and maximum pressure of the engine.
		Countercurrent heat exchange is important because the heat capacity of the liquid may be substantial, and that heat should not be coming from the heat source or ending up in the heat sink, but should stay in the hot portion of the liquid.
	www.halfbakery.com /idea/Isothermal_20bubble_20pump_20heat_20engine (3262 words)

	PowerPedia:Heat engine - PESWiki (Site not responding. Last check: )
		Heat engines relates to devices where the prime mover or engine is one in which a combustible material is "burned" within an inclosed space or chamber and the heat energy thus developed converted into work by permitting the resulting products of combustion to act upon and through mechanical powers.
		Heat is transferred in a heat engine to the sink from the source, and in this process some of the heat is converted into work by exploiting the properties of a working substance (usually a gas or liquid).
		The internal combustion engine is a heat engine in which the burning of a fuel occurs in a confined space called a combustion chamber.
	peswiki.com /index.php/PowerPedia:Heat_engine (0 words)

	Heat Engine Fundamentals March 26, 2005
		Engines that get their heat from a source located outside the engine and then conduct it into the working fluid are usually referred to as external combustion engines (ECEs), even though combustion is not strictly required.
		Heat engines can only run when provided with both something that is relatively warmer to provide the input heat and something that is relatively cooler to carry away the unconverted heat.
		Heat is transferred through the engine cylinder and into the working fluid, the working fluid is expanded converting some of the input heat to work, and the unconverted waste heat is then transferred out of the working fluid and into a cooling stream.
	www.sesusa.org /StirlingPrimer.htm (0 words)

	Heat engine Summary
		To be efficient, a heat engine must operate using a reversible process, that is, a process after which the thermodynamic system and its surroundings are returned to the state they were in before the process started.
		Theoretically, the most efficient heat engine is the Carnot cycle, although the Carnot cycle is not used for practical applications because of engineering difficulties that cannot be overcome.
		Heat is transferred to the sink from the source, and in this process some of the heat is converted into work by exploiting the properties of a working substance (usually a gas or liquid).
	www.bookrags.com /Heat_engine (0 words)

	HEAT ENGINES (Site not responding. Last check: )
		The cycle is approximated by the idealized gasoline engine operating the the Otto cycle in which the working substance is considered to be air undergoing reversible cycle and friction is absent.
		Heat is absorbed at constant pressure while the volume increases reversibly from b to c.
		Heat is rejected at constant volume thus reversibly lowering the pressure from d to a.
	www.poshusta.chem.wsu.edu /PChem_I/heat_engines.htm (0 words)

	Fact Sheets > What are Heat Engines?
		Heat engines cannot convert all the input energy to useful mechanical energy in the same cycle; some amount, in the form of heat, is always not available for the immediate performance of mechanical work.
		The maximum possible efficiency of a heat engine is that of a hypothetical (ideal) cycle, called the Carnot Cycle.
		Practical heat engines operate on less efficient cycles (such as the Rankine, Brayton, or Stirling) but in general, the highest thermal efficiency is achieved when the input temperature is as high as possible and the sink temperature is as low as possible.
	www.fact-sheets.com /science-nature/energy/heat_engines (0 words)

	Halfbakery: Yet Another Heat Engine
		The world is full of heat engines, gadgets that attempt to convert some of the energy of flowing heat (from hot to cold) like a waterwheel converts some of the energy of flowing water (from high to low).
		Every heat engine has a "working fluid" that starts in a hot place, flows through the mechanical innards of the engine, and then exits to a cool place, sometimes getting recycled afterwards.
		The engine described here is of the recycling variety, having a burner to generate heat, and a radiator to dump it.
	www.halfbakery.com /idea/Yet_20Another_20Heat_20Engine (3113 words)

	scientific look at Dennis Lee's heat engine claims (Site not responding. Last check: )
		Heat energy is measured in calories if you are a scientist and in BTU if you are a heating engineer.
		One way of making a perfect heat engine is to circulate a gas through two pistons and cylinders so that the pressure and temperature of the gas follow what is called the Carnot cycle.
		Since the heat engine works by heating and cooling a fixed amount of material we can represent the ratio of the two amounts of heat as the ratio of the absolute (Kelvin) temperatures of the source and the sink.
	www.phact.org /e/dennis15.html (0 words)

	Heat Engines
		Overall, heat is flowing from the hot boiler to the cooler surrounding air and some of that heat is being converted into mechanical work by the moving piston.
		Heat cannot flow from inside an ordinary refrigerator into the warmer room unless we plug in the electric motor that does work on the refrigerant.
		For a refrigerator we are interested in how much heat it removes from the cold reservoir for a given amount of work by outside forces on the system, for a heat pump we are interested in how much heat it delivers for a given amount of work done by outside forces on the system.
	electron9.phys.utk.edu /phys136d/modules/m3/heatpump.htm (0 words)

	Heat engines and the second law
		Heat can be made to flow from a colder region to a hotter region, which is exactly what happens in an air conditioner, but heat only does this when it is forced.
		A basic heat engine consists of a gas confined by a piston in a cylinder.
		The efficiency of an engine using irreversible processes can not be greater than the efficiency of an engine using reversible processes that is working between the same temperatures.
	physics.bu.edu /~duffy/py105/Heatengines.html (0 words)

	Heat Engine
		Heat engine is defined as a device that converts heat energy into mechanical energy or more exactly a system which operates continuously and only heat and work may pass across its boundaries.
		The operation of a heat engine can best be represented by a thermodynamic cycle.
		In case of a reverse heat engine the second law of thermodynamics is as follows: It is impossible to transfer heat from a cooler body to a hotter body without any work input i.e.
	www.taftan.com /thermodynamics/HENGINE.HTM (218 words)

	Chapter 5: Thermodynamics
		Heat engines take many forms, from the internal combustion engine in the family car to the giant turbines that generate electricity for our homes.
		But if you are making more than one engine from one chain, you can simply solder one of the beads to the lid, taking care that the hole in the bead where it connects to the rest of the chain is straight up.
		When the matchhead is heated, the sulfur and the potassium chlorate combine to make sulfur dioxide gas, and potassium chloride.
	www.scitoys.com /scitoys/scitoys/thermo/thermo.html (0 words)

	Rotary Stirling Rotary Overview
		Until now, ultra simple heat engine designs were generally devices that rocked or vibrated but did not rotate.
		Although this design has less points of friction than a conventional Stirling engine, it is slightly less efficient as it lacks dwell time and a regenerator, and chamber air turbulence is lower.
		It is not the first pseudo-rotary heat engine but it is the simplest.
	www.emachineshop.com /engine/index.htm (378 words)

	Heat Engine Projects
		theorem which says that a maximum efficiency of heat engine can be obtained by a reversible engine, and that efficiency depends only on the temperatures of the hot and the cool sources of the engine.
		A heat exchanger is used to boil water and a closed cycle generator system using a turbine then operates a generator or alternator.
		Sterling Thermal Power has developed a thermally driven powerplant comprised of a heat collector, an evaporator for vaporizing a heated refrigerant, an ORC rotary valved piston engine for converting the heated refrigerant vapor into power, a condenser for condensing the vaporous refrigerant exhaust, and Sterling's proprietary motorless feedpump for recycling the spent refrigerant for re-use.
	www.redrok.com /engine.htm (3562 words)

	Heat Engines, Curie Effect and Nitinol
		Heat the iron to a temperature of 770 C, which is its Curie Point, it loses its ferromagnetism behavior and it is no longer be attracted to a magnet.
		In this position, labeled B in the drawing, it is heated by the flame of a small birthday cake candle.
		When heated above a transition temperature (in this application about 50° C to 70° C) the Nitinol object abruptly returns to its high-temperature shape with a substantially force that is able to drive the two connected plastic wheels.
	www.imagesco.com /articles/heatengine/HeatEngine.html (0 words)

	Heat engine, refrigeration and heat pump cycles approximating the Carnot cycle and apparatus therefor (US5027602)
		Heat engine, refrigeration and heat pump cycles approximating the Carnot cycle and apparatus therefor
		These process approximations, in addition to isothermal heat addition and rejection, enable Carnot heat engine, refrigeration and heat pump cycles to be approximated.
		(c) expanding the heated working fluid provided by step (b) in an expander to produce a work output while the working fluid, during at least an initial portion of the expansion, is in the form of a mixture of fine droplets of saturated liquid in saturated vapour;
	www.delphion.com /details?pn=US05027602__ (635 words)

	Heat Engines: the Carnot Cycle
		All standard heat engines (steam, gasoline, diesel) work by supplying heat to a gas, the gas then expands in a cylinder and pushes a piston to do its work.
		The analog to having the water flow into buckets at the same height, with no wasteful drop, is to have the heat from the heat supply flow into the gas at the same temperature.
		After all the effort to construct an efficient heat engine, making it reversible to eliminate “friction” losses, etc., it is perhaps somewhat disappointing to find this figure of 27% efficiency when operating between 0 and 100 degrees Celsius.
	galileo.phys.virginia.edu /classes/152.mf1i.spring02/CarnotEngine.htm (0 words)

	Heat of your Hand Stirling Engine
		This Stirling engine is a beautiful conversation piece for your home or office or a great physics or chemistry demo for your classroom or lab.
		While this revolutionary Stirling Engine operates based on well understood physics, it may be the closest thing to magic and a perpetual motion machine you can buy anywhere at any price.
		You can safely place this engine on a low temperature heat source and let it run for weeks, months or perhaps even years.
	www.discoverthis.com /head-hand-stirling-engine.html (316 words)

	Thermalphysics.org - The Little Heat Engine - Essay
		This little heat engine is producing hypothetical work and it is also operating at a single temperature.
		Thus, the area nearest the little heat engine becomes colder (the atoms nearest the heat engine slow down their vibration) and the areas away from our little engine heat up (they increase their vibration).
		If the little heat engine is not stopped, much like what happened in the case of the solid and the liquid, the atomic gas will no longer be able to deal with the increased heat.
	www.thermalphysics.org /heat/heatengineessay.html (0 words)

	A Simple Lamina Flow Engine (Site not responding. Last check: )
		In discussions with Jim Senft he referred to it a Lamina flow engine, in US patents it is usually called an acoustical heat engine.
		It will be found that the power of the engine increases with the stroke, this is because larger volumes of air are pulsed through the heat exchanger.
		With the engine running it will be found that the closed end of the displacer remains cold whilst the cylinder end warms up.
	stirlingengines.org.uk /thermo/lamina.html (0 words)

	A Heat Engine: The first and second laws of thermodynamics
		A Heat Engine: The first and second laws of thermodynamics
		We’ll make up a heat engine that consists of 4 steps, 2 at constant volume (isochoric) and 2 at constant pressure (isobaric).
		From the first law of thermodynamics, or from the heat capacities, find Q for each step of the cycle.
	bama.ua.edu /~stjones/HeatEngine.htm (309 words)

	Cooling Fan - Partstrain.com
		Its primary function is to avoid overheating in the engine by transferring the heat from the engine into the air.
		This is mainly because the engine of a front-wheel drive vehicle is mounted transversely or crosswise.
		Thus the heat from the engine is pointed towards the side of the car.
	www.partstrain.com /ShopByDepartment/Cooling_Fan (631 words)

	Howstuffworks "How Stirling Engines Work"
		The Stirling engine is a heat engine that is vastly different from the internal-combustion engine in your car.
		But today, Stirling engines are used only in some very specialized applications, like in submarines or auxiliary power generators for yachts, where quiet operation is important.
		The Stirling cycle uses an external heat source, which could be anything from gasoline to solar energy to the heat produced by decaying plants.
	travel.howstuffworks.com /stirling-engine.htm (0 words)

	Chapter 5: Thermodynamics
		In this case, the thermometer is not the type with a liquid in a glass tube, but rather the dial type, where a needle moves like the hand of a clock across the numbers on the dial.
		In the second engine, I attached the head of the screw to the coat hangers with some copper wire, then soldered the wire to the coathangers.
		The heat energy in the hot water is converted into mechanical energy as the strip curls up.
	www.scitoys.com /scitoys/scitoys/thermo/thermo3.html (0 words)

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