Gradient optimization of control law for counterflow heat exchanger

2001 ◽  
Author(s):  
K. Fujarewicz
Keyword(s):  
Heat Exchanger ◽  
Control Law ◽  
Gradient Optimization

Direct Observation of Heat Exchanger Deposits by Cross Sectioning

1967 ◽  
Vol 25 ◽  
pp. 364-365
Author(s):  
R. W. Anderson ◽  
D. L. Senecal
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Heat Exchanger ◽  
Direct Observation ◽  
Cross Sections ◽  
Preparation Method ◽  
Specimen Preparation ◽  
Flowing Water ◽  
Transmission Electron ◽  
Deposit Layer

A problem was presented to observe the packing densities of deposits of sub-micron corrosion product particles. The deposits were 5-100 mils thick and had formed on the inside surfaces of 3/8 inch diameter Zircaloy-2 heat exchanger tubes. The particles were iron oxides deposited from flowing water and consequently were only weakly bonded. Particular care was required during handling to preserve the original formations of the deposits. The specimen preparation method described below allowed direct observation of cross sections of the deposit layers by transmission electron microscopy.The specimens were short sections of the tubes (about 3 inches long) that were carefully cut from the systems. The insides of the tube sections were first coated with a thin layer of a fluid epoxy resin by dipping. This coating served to impregnate the deposit layer as well as to protect the layer if subsequent handling were required.

EFFECT OF AMBIENT HEAT-IN-LEAKS ON A THREE-FLUID CRYOGENIC HEAT EXCHANGER WITH TWO THERMAL COMMUNICATIONS

2014 ◽  
Vol 6 (4) ◽  
pp. 285-300 ◽  
Author(s):  
Venkataram Krishna ◽  
S. Spoorthi ◽  
Pradeep G. Hegde ◽  
K. N. Seetharamu
Keyword(s):  
Heat Exchanger
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