The optimum high pressure for CO2 transcritical refrigeration systems with internal heat exchangers

2005 ◽  
Vol 28 (8) ◽  
pp. 1238-1249 ◽  
Author(s):  
Ying Chen ◽  
Junjie Gu
Keyword(s):  
High Pressure ◽  
Heat Exchangers ◽  
Internal Heat

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

Development Status of Coal-Fired Gas Heaters for Brayton-Cycle Cogeneration Systems

1983 ◽  
Author(s):  
S. V. Gunn ◽  
J. R. McCarthy
Keyword(s):  
High Pressure ◽  
Heat Exchangers ◽  
Coal Combustion ◽  
Operating Experience ◽  
Department Of Energy ◽  
Test Facility ◽  
Brayton Cycle ◽  
Pulverized Coal Combustion ◽  
Development Status ◽  
Near Term

Under contract from the Department of Energy, Rocketdyne is developing the technology of coal-fired gas heaters for utilization in Brayton-cycle cogeneration systems. The program encompasses both atmospheric fluidized bed and pulverized coal combustion systems; and it is directed toward the development of gas heater systems capable of delivering high pressure air or helium at 1550 F, when employing metallic heat exchangers, and 1750 F, when employing ceramic heat exchangers. This paper reports on the development status of the program, with discussions of the completed “screening” corrosion/erosion tests of candidate heat exchanger materials, a description and summary of the operating experience with the 6- by 6-foot AFB test facility and a projection of the potential for relatively near term commercialization of such heater systems.

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.

scholarly journals Optimization of Design of High Pressure Compact and Light-Weight Liquid Heat Exchangers

1998 ◽  
Author(s):  
P. Avran ◽  
A. Soudarev ◽  
B. Soudarev ◽  
V. Soudarev
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Heat Exchange ◽  
Heat Exchangers ◽  
Three Dimensional ◽  
Fuel Oil ◽  
Heat Output ◽  
Light Weight ◽  
Combined Approach ◽  
Liquid Heat

Results of an experimental study with a support of DRET (France) of two designs of liquid heat exchangers made of multi-channel aluminium tubes are presented with the objective to develop a fuel-oil recuperator, compact and light (less than 3 Kg). It was demonstrated that the application of a combined approach to heat exchange enhancements using three-dimensional turbulators as semi-spherical craters and bulges on channel walls of internal paths allows to increase the specific heat output of the heat exchanger from 10.5 to 13.3 kW/kg.

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