Flow Fields in Stirred Vessels Depending on Different Internal Heat Exchangers and Vessel Bottoms

2019 ◽  
Vol 91 (9) ◽  
pp. 1281-1292 ◽  
Author(s):  
Katja Jaehrling ◽  
Heyko Juergen Schultz
Keyword(s):  
Heat Exchangers ◽  
Internal Heat ◽  
Flow Fields ◽  
Stirred Vessels

Innovative Materials for Novel Concepts for Internal Heat Exchangers

2018 ◽  
Vol 33 (4) ◽  
pp. 453-459
Author(s):  
A. Rüppel ◽  
D. Jähnig ◽  
R.-U. Giesen ◽  
K. Vajen ◽  
H.-P. Heim
Keyword(s):  
Heat Exchangers ◽  
Internal Heat ◽  
Innovative Materials

On the Benefits of Separating the Heat Transfer Section and Analyzing Elementary Thermodynamic Cycles in Energy Systems Analysis

2008 ◽  
Author(s):  
Matteo Morandin ◽  
Andrea Toffolo ◽  
Andrea Lazzaretto
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
System Analysis ◽  
Internal Heat ◽  
Energy Systems ◽  
Energy System ◽  
Heat Sinks ◽  
Additional Contribution ◽  
Thermodynamic Cycles ◽  
System Configurations

The search for increasing performance and efficiency in energy system analysis leads to complex and highly integrated systems configurations. In a wide variety of energy systems the high integration among components derives from the need of correctly exploiting all the internal heat sources by a proper matching with the internal heat sinks. To address this problem in a general way, in previous works it was suggested to extract from the system flowsheet a “basic configuration” including the components different from the heat exchangers (named “basic” components) and a set of hot and cold thermal flows (without considering the heat exchangers that realize the heat transfer among them). It was also shown how the comprehension of the processes occurring within the system can be strongly facilitated by analyzing separately the elementary thermodynamic cycles involved in the system processes. In this paper, a further step is done by considering the overall efficiency as a baseline efficiency, obtained from the contributions of the separate elementary cycles, with the additional contribution given by the thermal coupling (i.e. the internal heat transfer) among the cycles themselves. The advantages of this analysis are shown using the evolution of the STIG cycle towards more complex system configurations as an example of application.

Computational Heat Transfer in Heat Exchanger Analysis and Design (Invited)

2005 ◽  
Author(s):  
Bengt Sunden
Keyword(s):  
Heat Transfer ◽  
Heat Exchangers ◽  
Rapid Development ◽  
Flow Fields ◽  
Analysis And Design ◽  
Recirculating Flow ◽  
Numerical Solution Methods ◽  
Solution Methods ◽  
Laminar And Turbulent Flow ◽  
Grid Points

Rapid development of computer capacity and advances in numerical solution methods for the governing equations of fluid flow and heat transfer have enabled CFD (computational fluid dynamics) methods to gradually become useful tools in research and development, engineering design and analysis of heat transfer equipment. However, turbulence modelling still presents a problem as accurate and reliable predictions of flow separation, reattachment, impingement and recirculating flow fields are requested. For heat exchangers both laminar and turbulent flow fields are of significance and in addition the geometries are complex, of small dimensions sometimes and turbulators or enhanced surfaces are applied. Still the demands on computers are strong as analysis of full scale equipment requires a huge amount of grid points and the computation times are long. The present paper concerns current CFD methods for thermal problems in analysis and design of heat exchangers. Application examples are presented and associated problems and limitations are discussed.

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