Heat transfer optimization in industrial systems with multiple steady states

2005 ◽  
pp. 168-176
Author(s):  
G. Joly ◽  
J. P. Kernévez
Keyword(s):  
Heat Transfer ◽  
Steady States ◽  
Multiple Steady States ◽  
Industrial Systems ◽  
Heat Transfer Optimization

Heat transfer optimization within open-ended annular cavities

10.2514/3.867 ◽  
1997 ◽  
Vol 11 ◽  
pp. 121-124 ◽  
Author(s):  
Kenneth C. Hall ◽  
Jeffrey P. Thomas ◽  
Earl H. Dowell ◽  
C. P. Desai ◽  
K. Vafai ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Optimization

scholarly journals Heat Transfer Optimization of end Winding Rotor Generator by the Use of Modified Axial Spacer: A Case Study

2021 ◽  
Vol 1845 (1) ◽  
pp. 012081
Author(s):  
Y Baskoro ◽  
I Jaya ◽  
A Glowacz ◽  
M Sulowicz ◽  
W Caesarendra
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Optimization

Microstructure simulation and heat transfer optimization for graphene oxide doped anti-/deicing composites

2021 ◽  
Vol 213 ◽  
pp. 108901
Author(s):  
Long Chen ◽  
Junjie Ren ◽  
Yishu Zhang ◽  
Zhanqiang Liu ◽  
Fuquan Xu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Graphene Oxide ◽  
Microstructure Simulation ◽  
Heat Transfer Optimization

POVERTY TRAPS AND INFERIOR GOODS IN A DYNAMIC HECKSCHER–OHLIN MODEL

2012 ◽  
Vol 17 (6) ◽  
pp. 1227-1251 ◽  
Author(s):  
Eric W. Bond ◽  
Kazumichi Iwasa ◽  
Kazuo Nishimura
Keyword(s):  
Economic Theory ◽  
Steady State ◽  
World Economy ◽  
Steady States ◽  
The Other ◽  
Poverty Traps ◽  
Poverty Trap ◽  
Multiple Steady States ◽  
The World ◽  
State Capital

We extend the dynamic Heckscher–Ohlin model in Bond et al. [Economic Theory(48, 171–204, 2011)] and show that if the labor-intensive good is inferior, then there may exist multiple steady states in autarky and poverty traps can arise. Poverty traps for the world economy, in the form of Pareto-dominated steady states, are also shown to exist. We show that the opening of trade can have the effect of pulling the initially poorer country out of a poverty trap, with both countries having steady state capital stocks exceeding the autarky level. However, trade can also pull an initially richer country into a poverty trap. These possibilities are a sharp contrast with dynamic Heckscher–Ohlin models with normality in consumption, where the country with the larger (smaller) capital stock than the other will reach a steady state where the level of welfare is higher (lower) than in the autarkic steady state.

scholarly journals Heat Transfer Optimization of NEXA Ballard Low-Temperature PEMFC

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2182
Author(s):  
Artem Chesalkin ◽  
Petr Kacor ◽  
Petr Moldrik
Keyword(s):  
Heat Transfer ◽  
Fuel Cell ◽  
Low Temperature ◽  
Stable Condition ◽  
Energy System ◽  
Proton Exchange ◽  
Cfd Modeling ◽  
Heat Distribution ◽  
Operation Conditions ◽  
Heat Transfer Optimization

Hydrogen is one of the modern energy carriers, but its storage and practical use of the newest hydrogen technologies in real operation conditions still is a task of future investigations. This work describes the experimental hydrogen hybrid energy system (HHS). HHS is part of a laboratory off-grid system that stores electricity gained from photovoltaic panels (PVs). This system includes hydrogen production and storage units and NEXA Ballard low-temperature proton-exchange membrane fuel cell (PEMFC). Fuel cell (FC) loses a significant part of heat during converting chemical energy into electricity. The main purpose of the study was to explore the heat distribution phenomena across the FC NEXA Ballard stack during load with the next heat transfer optimization. The operation of the FC with insufficient cooling can lead to its overheating or even cell destruction. The cause of this undesirable state is studied with the help of infrared thermography and computational fluid dynamics (CFD) modeling with heat transfer simulation across the stack. The distribution of heat in the stack under various loads was studied, and local points of overheating were determined. Based on the obtained data of the cooling air streamlines and velocity profiles, few ways of the heat distribution optimization along the stack were proposed. This optimization was achieved by changing the original shape of the FC cooling duct. The stable condition of the FC stack at constant load was determined.

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