scholarly journals Optimisation of Low Temperature Difference Solar Stirling Engines using Genetic Algorithm

2011 ◽  
Author(s):  
Kwanchai Kraitong ◽  
K Mahkamov
Keyword(s):  
Genetic Algorithm ◽  
Low Temperature ◽  
Temperature Difference ◽  
Stirling Engines

Thermodynamic peculiarities of alpha-type Stirling engines for low-temperature difference power generation: Optimisation of operating parameters and heat exchangers using a third-order model

2013 ◽  
Vol 228 (11) ◽  
pp. 1936-1947 ◽  
Author(s):  
Benedikt Hoegel ◽  
Dirk Pons ◽  
Michael Gschwendtner ◽  
Alan Tucker ◽  
Mathieu Sellier
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Temperature Difference ◽  
Heat Exchangers ◽  
Operating Parameters ◽  
Heat Sources ◽  
Third Order ◽  
Concentrated Solar Energy ◽  
Stirling Engines ◽  
Temperature Heat

Low-temperature heat sources such as waste heat and geothermal energy in the range from 100 ℃ to 200 ℃ are widely available and their potential is largely untapped. Stirling engines are one possibility to convert this heat to a usable power output. Much work has been done to optimise Stirling engines for high-temperature heat sources such as external combustion or concentrated solar energy but only little is known about suitable engine layouts at lower temperature differences. With the reduced temperature difference, changes become necessary not only in the heat exchangers and the regenerator but also in the operating parameters such as frequency and phase angle. This paper shows results obtained from a third-order simulation model that help to identify beneficial parameter combinations, and explains the differences of low and high-temperature engines.

scholarly journals Thermo-voltage measurements of atomic contacts at low temperature

2016 ◽  
Vol 7 ◽  
pp. 767-775 ◽  
Author(s):  
Ayelet Ofarim ◽  
Bastian Kopp ◽  
Thomas Möller ◽  
León Martin ◽  
Johannes Boneberg ◽  
...  
Keyword(s):  
Finite Element ◽  
Low Temperature ◽  
Temperature Difference ◽  
Laser Heating ◽  
Laser Source ◽  
Break Junction ◽  
Resistance Change ◽  
Element Simulation ◽  
Novel Method

We report the development of a novel method to determine the thermopower of atomic-sized gold contacts at low temperature. For these measurements a mechanically controllable break junction (MCBJ) system is used and a laser source generates a temperature difference of a few kelvins across the junction to create a thermo-voltage. Since the temperature difference enters directly into the Seebeck coefficient S = −ΔV/ΔT, the determination of the temperature plays an important role. We present a method for the determination of the temperature difference using a combination of a finite element simulation, which reveals the temperature distribution of the sample, and the measurement of the resistance change due to laser heating of sensor leads on both sides next to the junction. Our results for the measured thermopower are in agreement with recent reports in the literature.

Early Development Of A 100 Watt Low Temperature Difference Stirling Engine

2021 ◽  
Author(s):  
Matthias Lottmann ◽  
Zachary C. de Rouyan ◽  
Linda Hasanovich ◽  
Steven M. W. Middleton ◽  
Michael Nicol-Seto ◽  
...  
Keyword(s):  
Low Temperature ◽  
Early Development ◽  
Temperature Difference ◽  
Stirling Engine

Performance of low-temperature differential Stirling engines

2007 ◽  
Vol 32 (4) ◽  
pp. 547-566 ◽  
Author(s):  
Bancha Kongtragool ◽  
Somchai Wongwises
Keyword(s):  
Low Temperature ◽  
Temperature Differential ◽  
Stirling Engines
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