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Topic: Joule cycle


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In the News (Tue 23 Jul 19)

  
  Atkinson cycle - Wikipedia, the free encyclopedia
The Atkinson cycle allows the intake, compression, power, and exhaust strokes of the four-stroke cycle to occur in a single turn of the crankshaft.
The Atkinson cycle may also refer to a four stroke engine in which the intake valve is held open longer than normal to allow a reverse flow of intake air into the intake manifold.
In all of these vehicles, the lower power level of the Atkinson cycle engine is compensated for through the use of electric motors in a hybrid electric drive train.
en.wikipedia.org /wiki/Atkinson_cycle   (510 words)

  
 Brayton cycle - Wikipedia, the free encyclopedia
The "Brayton cycle" is a constant pressure cycle named after George Brayton (1830-1892), the American engineer who developed it.
Today the Brayton cycle is a cyclic process generally associated with the gas turbine.
Like other internal combustion power cycles it is an open system, though for thermodynamic analysis it is a convenient fiction to assume that the exhaust gases are reused in the intake, enabling analysis as a closed system.
en.wikipedia.org /wiki/Brayton_cycle   (611 words)

  
 Untitled Document
The reversed gas, or Joule-Brayton cycle has been used extensively in the past for refrigeration applications wherever the fundamental requirements included the compact dimensions of the equipment (for instance, for air conditioning on board aircraft).
The loss of efficiency with the reversed gas cycle by comparison with the steam compression cycle diminishes progressively, however, with lower temperatures of the cold source, as shown in the analysis in Figure 1.
The refrigeration cycle is interrupted as necessary by a defrosting cycle, in which the regeneration cycle and the freezer are disabled, while the turbine is bypassed.
www.eurocooling.com /articleancona.htm   (1628 words)

  
 Heat engine   (Site not responding. Last check: 2007-11-03)
Heat is transferred to the sink from the source, and in this process some of the heat is converted into work.
The carnot heat engine (the ideal imaginary heat engine) has an efficency equal to (T1 - T2)/T1 where T1 is the temperature of the hot source and T2 is the temperature of the cold sink.
The general surroundings are the heat sink, providing relatively cool gases which when heated, expand rapidly to drive the mechanical motion of the engine.
www.icyclopedia.com /encyclopedia/h/he/heat_engine.html   (461 words)

  
 Joule's Thermoscope
Joule says, "With air in the receiver at the atmospheric pressure, the mere standing at the distance of two yards on one side of the instrument would in a short space of time cause the needle to travel through 10
All the classical thermodynamic cycles and all heat engines in operation today involve extraction of work during the expansion of a gas.
In a closed cycle the expanded gas must be compressed to complete the cycle; the energy lost during compression goes into an energy sink.
www.globalwarmingsolutions.co.uk /joules_thermoscope.htm   (1887 words)

  
 ANALYSIS OF THE ADSORPTION CYCLES WITH THERMAL REGENERATION BASED ON THE ENTROPIC MEAN TEMPERATURES   (Site not responding. Last check: 2007-11-03)
Indeed, considering the entropic cycle of the heat transfer fluid as a whole, it appears that this cycle is a combination of a Carnot engine cycle and a Joule heat pump cycle.
The Joule heat pump cycle permits more than simple heat recovery, it permits upgrading heat from the adsorber being cooled down to the adsorber being heated up: this is thermal regeneration.
The competition between the efficiency of the adsorption cycle, that of the thermal regeneration process and the irreversibilities in the heat transfer is highlighted.
www.limsi.fr /Individu/mpons/pubabs/ate3ab.htm   (225 words)

  
 Steam Automobile Club of America... :: SteamStuff :: Enginion - Clean & "Ezee"   (Site not responding. Last check: 2007-11-03)
The engine is really two separate cycles, a two stage compound section running a standard Rankine cycle and a Joule cycle tacked on because the second stage of the compound has double acting pistons and the first stage does not.
Consider the Joule cycle of my engine as totally separate from the Rankine cycle which is taking place in other areas of the engine.
Their only conection is that the rejected heat from the Joule cycle goes to the boiler to heat some of the water circulating in the Lamont coil.
www.steamautomobile.com /ForuM/read.php?1,6248   (4480 words)

  
 Brayton or Joule Cycle   (Site not responding. Last check: 2007-11-03)
Brayton cycle is an ideal air standard cycle for the closed cycle gas turbine unit.
Both the heat supplied and rejected from the cycle occur at constant pressure, therefore this cycle is also known as constant pressure cycle.
wher m is the mass flow of the cycle.
www.taftan.com /thermodynamics/BRAYTON.HTM   (103 words)

  
 RedVector.com :: Printable View of Brayton Cycle (Gas Turbine) Analysis (1 hour) [S] CON
The ideal cycle for the simple gas turbine is the "Brayton Cycle", also called the Joule Cycle.
The Brayton Cycle thermal efficiency is also presented (but only for the air as the working fluid) and the thermal efficiency derivation is presented with a simple mathematical approach.
The Brayton Cycle is presented in the "T - s" diagram and its major performance trends (specific power output and power output) are plotted in figures as a function of compressor pressure ratio, gas turbine inlet temperature and working fluid mass flow rate.
www.redvector.com /web_store/printable_course.asp?id=2435   (292 words)

  
 Brayton Cycle   (Site not responding. Last check: 2007-11-03)
Power and efficiency in a regenerative gas-turbine cycle with multiple reheating...
An Assessment of the Brayton Cycle for High Performance Power Plant...
Closed Brayton Cycle Startup Transient for a Gas Cooled Reactor...
www.scienceoxygen.com /aviation/82.html   (170 words)

  
 UNIVERSITY OF PLYMOUTH
       An ideal gas turbine operating on the Joule cycle is required to produce an output power of 1MW.
       An ideal gas turbine operating on the Joule cycle uses air as the working substance.
  Determine the maximum cycle temperature and the plant efficiency.
www.tech.plym.ac.uk /sme/THER205-web/ther204a-tut-gasturb.htm   (660 words)

  
 The Joule cycle   (Site not responding. Last check: 2007-11-03)
In the Joule cycle an enclosed gas flows continuously to and fro between a compressor and an expander, taking in heat in one direction and giving out heat in the other.
The natural role of the ideal Joule cycle heat engine is thus the harnessing of a temperature difference between two supplies of fluid; the two streams can, in theory, be brought to a common temperature with the accompanying delivery, by the coupled compressor and expander, of the maximum possible work.
The author shows the feasibility of (i) a Joule engine, taking heat from gases of combustion and pre-heating the air supply, and (ii) a Joule cycle heat pump.
stacks.iop.org /0143-0807/1/39   (274 words)

  
 sm2001
Some potentially useful formulas are given at the end of the exam.
diagram for the Joule ideal gas cycle is shown on the figure on the next page.
Express the thermodynamic efficiency of the cycle in terms of
www.physics.ubc.ca /~birger/sm2001   (178 words)

  
 IngentaConnect Feasibility of air cycle systems for low-temperature refrigeratio...   (Site not responding. Last check: 2007-11-03)
In this paper the viability of an air cycle refrigeration system (Joule cycle) is investigated for a moderately low-temperature cooling system with heat recovery.
The goal is to determine the best possible cycle configuration of heat exchangers and turbomachinery components for this particular application, and then to determine whether it can compete with a conventional vapour compression system.
Simple models were developed for each cycle configuration, and the results were compared with each other on a consistent basis.
www.ingentaconnect.com /content/pep/jpm/2003/00000217/00000003/art00010   (217 words)

  
 Home Page - Joule Bergerson Ph.D.
Joule Bergerson recently received her Ph.D. in a joint program of Civil and Environmental Engineering and Engineering and Public Policy at Carnegie Mellon University.
The title of her dissertation was “Future Electricity Generation: An Economic and Environmental Life Cycle Perspective on Technology Options and Policy Implications” under the direction of Professors Lester Lave and Chris Hendrickson.
She has a Masters of Engineering Degree in Chemical Engineering with a collaborative program in Environmental Engineering from the University of Toronto and an undergraduate degree in chemistry and environmental science from the University of Western Ontario.
www.ucalgary.ca /~jbergers   (357 words)

  
 1   (Site not responding. Last check: 2007-11-03)
The most significant difference between air refrigeration cycles and conventional vapour compression cycles is that the refrigerant (dry air) normally stays in the gas phase throughout the cycle.
Because air cycles involve sensible heat transfer (the refrigerant stays in the gas-phase) much greater refrigerant (air) flow rates are required than in comparable vapour compression systems which include latent heat transfer.
Most current air cycle plant use turbines because these can be made compact and can achieve high efficiencies.
projects.bre.co.uk /aircycle/thermodynamics.htm   (146 words)

  
 CIRRUS Servos and Accessories, at Hobby Outlet   (Site not responding. Last check: 2007-11-03)
Cycle Pro Plug Set JR (JR RX, Stnd TX)
Cirrus CS-3 Micro Joule Servo Jst Conn. 3 Grams
Cirrus Cycle Pro Plug Set JR (JR RX, Stnd TX)
www.hobbyoutlets.com /cirrus   (809 words)

  
 Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
S>The Joule cycle combines the advantages of the Stirling cycle and the Rankine cycle for space power systems.
For long term missions a Joule engine will convert solar or nuclear energy to shaft power with a lighter system weight than the Rankine cycle and without the power limitation of the Stirling cycle.
For short term missions the Joule cycle, using hydrogen ice as a heat sink, yields a more efficient system than the hydrogen expansion engine.
www.osti.gov /energycitations/product.biblio.jsp?osti_id=4789684   (183 words)

  
 MEC3002   (Site not responding. Last check: 2007-11-03)
To apply the concepts and knowledge of prerequisite units to thermal cycles using air and vapour as medium.
Combined cycles applications, and to be able to offer technical opinion on the merits and weakness of such cycles in practice.
Air standard Cycles: Carnot Cycle, Otto Cycle, Joule Cycle, Diesel Cycle, Mixed Combustion Cycle, Ericsson Cycle, Sterling Cycle, Open and Closed Gas Turbine Cycle, Optimization of Gas Turbine Cycle, Cycle with Regenerator, Effects of variable specific heats, Cycle for Jet Propulsion.
www.eng.um.edu.mt /~mec/MEC3002.html   (149 words)

  
 More on Heat Engine
The carnot heat engine (the ideal imaginary heat engine) has an efficiency equal to (T1 - T2)/T1 where T1 is the absolute temperature of the hot source and T2 that of the cold sink.
In these cycles and engines the working fluids are gases and liquids:
o Regenerative cycle Are more efficient than Rankine cycle.
www.artilifes.com /heat-engine.htm   (660 words)

  
 IngentaConnect Thermodynamic design of a reciprocating Joule cycle engine   (Site not responding. Last check: 2007-11-03)
This paper describes a first-order model of a Reciprocating Joule Cycle (RJC) engine, which is then used to investigate its thermodynamic design with a view to establishing its optimum performance for a given set of operating conditions.
The thermodynamic cycle investigated incorporates regenerative heat exchange.
An air standard model modified to include the effects of friction, combustion, clearance volumes, leakage and pressure drops, shows that the performance of the RJC engine is strongly dependent on its operating pressure ratio and dependent to a much lesser extent on its expander to compressor swept volume ratio.
www.ingentaconnect.com /content/pep/jpe/2003/00000217/00000003/art00003   (317 words)

  
 Efficiency of a Joule-Brayton engine at maximum power density
A new kind of power analysis is conducted on a reversible Joule-Brayton cycle.
In the studies of Curzon and Ahlborn and others, researchers utilized the thermal efficiency at maximum power as an efficiency standard for practical heat engines.
In this paper, instead of just maximizing power for certain cycle parameters, the power density defined as the ratio of power to the maximum specific volume in the cycle, is maximised.
stacks.iop.org /0022-3727/28/1309   (297 words)

  
 3-II/B-2 NON-CHLOROFLUOROCARBON ALTERNATIVES FOR AIR CONDITIONING AND REFRIGERATION   (Site not responding. Last check: 2007-11-03)
Absorption: Industrial processes with excess waste heat but also needing refrigeration, gas fired systems are often used in remote areas where electrical costs are high or the supply of electricity will not meet demand, often used in conjunction with electrically powered vapor compression systems to reduce peak load power demands.
Evaporative cooling (direct and indirect) - zero ODP and GWP, high efficiency in dry climates, provides humidity, improves indoor air quality, high air flow rates, commercially available, life cycle is cost effective, adaptable to various energy sources.
Air (Joule) Cycle - zero ODP and GWP, non-toxic, non-flammable, low installation and maintenance costs.
www.p2pays.org /ref/20/19926/p2_opportunity_handbook/3_II_B_2.html   (913 words)

  
 Thermal Physics Fall 2001
Sep. 28 Expanded discussion of Gay-Lussac and Joule Experimental Measurements of the Joule coefficient.
Start "Otto" cycle discussion and its relationship to Gator Nationals!
Pose some additional problems: Joule cycle, investment possiblity, 3 heat bath engine.
www.phys.ufl.edu /~meisel/thermoschedule.htm   (732 words)

  
 [No title]
Laboratory exercises give practical demonstration of a reciprocating internal combustion engine.
Intellectual Abilities: On successful completion of the module, students should be able to demonstrate ability in applying knowledge of the above topics to: describe and explain how steam power plant, gas turbines and reciprocating internal combustion engines work analyse the basic thermodynamic power cycles and carry out the associated calculations explain environmental aspects of engineering.
Practical Skills On completion of the module, students should be able to show experience and enhancement of their experimental skills: setting up and using instrumentation for measurement of flow and temperature; measuring power output using a hydraulic dynamometer; taking, recording, displaying and analysing results.
pcwww.liv.ac.uk /eweb/programmes/MECH291.DOC   (325 words)

  
 Prof. Tony Roskilly - Marine Science and Technology - University of Newcastle
Development of the reciprocating Joule cycle engine concept.
Marine electric power management and power management system design.
Moss, R.W., Roskilly, A.P., Nanda, S.K. Preliminary design of a reciprocating Joule cycle engine for domestic CHP systems.
www.ncl.ac.uk /marine/staff/profile/tony.roskilly   (673 words)

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