Closed Circuit Liquid Hydrogen Refrigeration System

1960 ◽  
Vol 31 (7) ◽  
pp. 712-716 ◽  
Author(s):  
D. B. Chelton ◽  
J. W. Dean ◽  
B. W. Birmingham
Keyword(s):  
Liquid Hydrogen ◽  
Closed Circuit ◽  
Refrigeration System

Scaling risk assessment in a closed circuit recycled board mill by speciation methods

TAPPI Journal ◽  
2012 ◽  
Vol 11 (5) ◽  
pp. 53-61 ◽  
Author(s):  
PATRICK HUBER ◽  
SYLVIE NIVELON ◽  
PATRICE NORTIER
Keyword(s):  
Calcium Carbonate ◽  
Volatile Fatty Acids ◽  
Inorganic Carbon ◽  
Stability Index ◽  
Closed Circuit ◽  
Critical Problem ◽  
Local Scaling ◽  
Water Analyses ◽  
Closed Water ◽  
Speciation Calculation

Calcium carbonate scaling often is a critical problem for recycled board mills that have closed water circuits. The objective of this study was to determine local scaling risks throughout the production process. To predict scaling potential, we calculated several saturation indexes, based on speciation determined from detailed water analyses. Calculated scaling trends are in accordance with observed dissolution and precipitation of calcium carbonate in the process, when considering local aeration phenomena. The importance of volatile fatty acids (resulting from anaerobic bacterial activity) in calco-carbonic equilibriums is discussed, and taken into account in the speciation calculation. We also demonstrate the need to measure inorganic carbon instead of alkalinity in such conditions. This makes typical scaling indexes, such as the Ryznar Stability Index, irrelevant to predict scaling risk in closed circuit conditions; thus, it is necessary to use general speciation methods, as described in this paper.

Influence of Ultrasound on the Formation of High-energy Particle Tracks in a Liquid-hydrogen Bubble Chamber

1969 ◽  
Vol 99 (9) ◽  
pp. 149-151
Author(s):  
V.A. Akulichev ◽  
L.R. Gavrilov ◽  
V.G. Grebinnik ◽  
V.A. Zhukov ◽  
G. Libman ◽  
...  
Keyword(s):  
Bubble Chamber ◽  
High Energy ◽  
Liquid Hydrogen ◽  
High Energy Particle ◽  
Hydrogen Bubble ◽  
Hydrogen Bubble Chamber ◽  
Energy Particle ◽  
Particle Tracks

Optimum Choice of Refrigerant for Miniature Vapour Compression Refrigeration System

2011 ◽  
Vol 3 (3) ◽  
pp. 134-136
Author(s):  
M. M. Tayde M. M. Tayde ◽  
◽  
Pranav Datar ◽  
Pankaj kumar ◽  
Dr. L. B. Bhuyar Dr. L. B. Bhuyar
Keyword(s):  
Refrigeration System ◽  
Optimum Choice ◽  
Vapour Compression
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