Abstract of "HIGH TEMPERATURE HEAT EXCHANGERS AND MICROSCALE COMBUSTION SYSTEMS: APPLICATIONS TO THERMAL SYSTEM MINIATURIZATION"

2000 ◽  
Author(s):  
Dr. Mike M. Ohadi ◽  
Steven G. Buckley
Keyword(s):  
High Temperature ◽  
Heat Exchangers ◽  
Thermal System ◽  
Temperature Heat ◽  
Combustion Systems ◽  
System Miniaturization

Development of High-Temperature Heat Exchangers Using SIC Microchannels

2012 ◽  
pp. 223-236
Author(s):  
Merrill A Wilson ◽  
Raymond Cutler ◽  
Marc Flinders ◽  
Matt Quist ◽  
Darin Ray ◽  
...  
Keyword(s):  
High Temperature ◽  
Heat Exchangers ◽  
Temperature Heat

scholarly journals Externally Fired Combined Cycles (EFCC): Part B — Alternative Configurations and Cost Projections

1996 ◽  
Author(s):  
Stefano Consonni ◽  
Ennio Macchi
Keyword(s):  
High Temperature ◽  
Heat Exchangers ◽  
Gas Turbines ◽  
High Efficiency ◽  
Complete Combustion ◽  
Economic Issues ◽  
Temperature Heat ◽  
Combined Cycles ◽  
Power Outputs ◽  
The Cost

Externally Fired Combined Cycles (EFCC) constitute one of the options allowing the use of “dirty” fuels like coal, biomass or waste in conjunction with modern, high efficiency gas turbines. This two-part paper discusses thermodynamic, technological and economic issues crucial to the successful realization of EFCCs. Part B discusses the cycle arrangement, its implications for the design and the cost of the high temperature heat exchangers, the effects of scale and the economic prospects. An “enhanced” configuration whereby the excess air sent to the combustor is limited to the minimum required for complete combustion can reach net LHV efficiencies above 50%, with relatively low high-temperature heat transfer surface requirements. Cost projections are hindered by the uncertainty on the cost of the high temperature heat exchangers. Estimates based on published and proprietary data collected by the authors indicate that EFCCs should be cost-competitive with IGCCs, especially at medium-low power outputs.

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.

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