A pistonless Stirling engine—The traveling wave heat engine

1979 ◽  
Vol 66 (5) ◽  
pp. 1508-1513 ◽  
Author(s):  
Peter H. Ceperley
Keyword(s):  
Traveling Wave ◽  
Heat Engine ◽  
Stirling Engine

Study of a liquid-piston traveling-wave thermoacoustic heat engine with different working gases

Energy ◽  
2014 ◽  
Vol 74 ◽  
pp. 158-163 ◽  
Author(s):  
Dong-Hui Li ◽  
Yan-Yan Chen ◽  
Er-Cang Luo ◽  
Zhang-Hua Wu
Keyword(s):  
Traveling Wave ◽  
Heat Engine ◽  
Liquid Piston

Experimental Study of the Operation Conditions of Stability on a Gamma Stirling Engine

2016 ◽  
Author(s):  
Houda Hachem ◽  
Ramla Gheith ◽  
Fethi Aloui ◽  
Sassi Ben Nasrallah
Keyword(s):  
Experimental Study ◽  
Rotational Speed ◽  
Heat Engine ◽  
Industrial Process ◽  
Stirling Engine ◽  
Load Pressure ◽  
Operation Conditions ◽  
Receiver System ◽  
Power Load ◽  
Time Required

Considering Stirling engines modern applications and cogeneration recovery energy from industrial process, the power of a Stirling prime mover is to be provided at a speed of rotation adapted to the operation of the receiver system (usually a generator) to exploit the performance of this machine under the conditions of its use (ie lowering of the rotational speed and torque transmitted rise or, more rarely, elevated speed and lowering the torque transmitted). Knowing that the hot air engine cannot change speed quickly and in order to have a well designed system, it is important to study the unsteady state conditions. In this work we present an experimental stability analysis of an irreversible heat engine working at different conditions. The experimental study aims at analyzing the effect of working parameters disruption on the stability of the Gamma Stirling engine. Parameters involved in this experimental study are the load pressure of the motor and the load applied to the Stirling engine. The influence of engine operating parameters on its torque and rotational speed is investigated. The time required by a gamma type Stirling engine to stabilize operation after disruption is estimated. Results show that after a small disruption, speed and temperature evolutions decays exponentially to the steady state determined by a relaxation time. It is assumed that the decrease of the applied power load to the engine or the increase of the load pressure leads to a speed up. And that the increase of the applied power load to the engine or the decrease of the load pressure leads to a speed down.

Improving the Efficiency of Stirling Engines for Use in Solar Distributed Electricity, Heating, and Cooling

2013 ◽  
Author(s):  
Travis M. Schubert ◽  
Shirin Jouzdani ◽  
Kevin P. Hallinan
Keyword(s):  
Heat Exchanger ◽  
Thermal Efficiency ◽  
Effective Means ◽  
Heat Engine ◽  
Stirling Engine ◽  
Future Application ◽  
Film Material ◽  
Expansion Chamber ◽  
Thermal Switch ◽  
Low Mass

Limiting solar power is the inability to cost effectively store energy. The most cost effective means to store solar energy is thermally in the ground, which can then be used for direct conversion to electricity. However, doing so is limited by a historically poor thermal efficiency of such engines. A novel Stirling engine is posed which more closely mimics a Carnot heat engine. It does this through the use of a new passive thermal ‘switch’ which permits heat flow into the expansion chamber of the Stirling engine only when the temperature of the chamber is above a desired value. Ideally heat would be added only at the end of the compression stroke and the beginning of the expansion stroke. Central to this thermal switch is the use of a vanadium dioxide (VO2) low mass heat exchanger internal to the expansion chamber. This low mass heat exchanger allows the film material to track and react to the temperature changes within the expansion chamber, permitting it to transfer heat only when needed. An adiabatic model of this enhanced solar Stirling engine is developed. Results indicate that the thermal efficiency can be nearly doubled, delivering a second law efficiency of over 0.6. Further, a year round overall efficiency accounting for losses in the Stirling engine and solar thermal collectors of 7% appears to be feasible when this engine is integrated with ground solar storage, providing the necessary power to meet loads in a low energy residence. Such results demonstrate promise for future application of this technology.

scholarly journals Prospective increase in the heat pump’s efficiency through arrangement in a three-temperature system

2019 ◽  
Vol 11 (10) ◽  
pp. 168781401988098
Author(s):  
Tomáš Stejskal ◽  
Jozef Svetlík ◽  
Peter Demeč ◽  
Adam Žilinský ◽  
Juraj Kováč
Keyword(s):  
Heat Pump ◽  
Heat Engine ◽  
Heating System ◽  
Stirling Engine ◽  
Thermal Source ◽  
Heating Systems ◽  
Economic Issues ◽  
Advantages And Disadvantages ◽  
System A ◽  
Temperature Heating

Analysis of three-temperature heating system has revealed the apparent advantages and disadvantages that the combination of thermodynamic systems has in future development with respect to environmental and economic issues. Three-temperature heating systems consist of a heat engine and a heat pump, thus enabling maximum use of the primary thermal source for heating buildings. It seems that the combination of a Stirling engine, or a similar heat drive, with a heat pump is suitable. In order to analyse the effectiveness of such a system, a comprehensive calculation procedure is used as follows: its basis lies in accounting for all types of energy and their relationship to the original natural resource. The present study aims to point out that the combination of a Stirling engine and a heat pump is a useful solution due to the fact that it has the most favourable resultant economic impact in comparison to the use of a diesel, four-stroke gas or the most commonly used electric drive.

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