Corrosive effect of lithium nitrate trihydrate on common heat exchanger materials

2018 ◽  
Vol 70 (5) ◽  
pp. 877-887 ◽  
Author(s):  
Emily Emmons ◽  
Patrick J. Shamberger
Keyword(s):  
Heat Exchanger ◽  
Lithium Nitrate ◽  
Nitrate Trihydrate ◽  
Corrosive Effect

Cyclic stability of lithium nitrate trihydrate in plate fin heat exchangers

2020 ◽  
Vol 179 ◽  
pp. 115476
Author(s):  
Achutha Tamraparni ◽  
Patrick J. Shamberger ◽  
Jonathan R. Felts
Keyword(s):  
Heat Exchangers ◽  
Lithium Nitrate ◽  
Cyclic Stability ◽  
Nitrate Trihydrate

Towards High Energy Density, High Conductivity Thermal Energy Storage Composites

2012 ◽  
Author(s):  
Patrick J. Shamberger ◽  
Daniel E. Forero
Keyword(s):  
Thermal Conductivity ◽  
Energy Storage ◽  
Energy Density ◽  
Thermal Energy ◽  
Thermal Energy Storage ◽  
High Energy ◽  
High Energy Density ◽  
Lithium Nitrate ◽  
Nitrate Trihydrate ◽  
Graphitic Foam

Thermal energy storage (TES) materials absorb transient pulses of heat, allowing for rapid storage of low-quality thermal energy for later use, and effective temperature regulation as part of a thermal management system. This paper describes recent development of salt hydrate-based TES composites at the Air Force Research Laboratory. Salt hydrates are known to be susceptible to undercooling and chemical segregation, and their bulk thermal conductivities remain too low for rapid heat transfer. Here, we discuss recent progress towards solving these challenges in the composite system lithium nitrate trihydrate/graphitic foam. This system takes advantage of both the high volumetric thermal energy storage density of lithium nitrate trihydrate and the high thermal conductivity of graphitic foams. We demonstrate a new stable nucleation agent specific to lithium nitrate trihydrate which decreases undercooling by up to ∼70% relative to previously described nucleation agents. Furthermore, we demonstrate the compatibility of lithium nitrate trihydrate and graphitic foam with the addition of a commercial nonionic silicone polyether surfactant. Finally, we show that thermal conductivity across water-graphite interfaces is optimized by tuning the surfactant concentration. These advances demonstrate a promising route to synthesizing high energy density, high thermal conductivity TES composites.

Bifurcated Hydrogen Bond in Lithium Nitrate Trihydrate Probed by ab Initio Molecular Dynamics

2012 ◽  
Vol 116 (9) ◽  
pp. 2147-2153 ◽  
Author(s):  
Francesco Muniz-Miranda ◽  
Marco Pagliai ◽  
Gianni Cardini ◽  
Roberto Righini
Keyword(s):  
Molecular Dynamics ◽  
Hydrogen Bond ◽  
Ab Initio ◽  
Ab Initio Molecular Dynamics ◽  
Lithium Nitrate ◽  
Nitrate Trihydrate ◽  
Bifurcated Hydrogen Bond

Dynamics of Weak, Bifurcated, and Strong Hydrogen Bonds in Lithium Nitrate Trihydrate

2011 ◽  
Vol 2 (13) ◽  
pp. 1633-1638 ◽  
Author(s):  
Jasper C. Werhahn ◽  
Stanislav Pandelov ◽  
Sotiris S. Xantheas ◽  
Hristo Iglev
Keyword(s):  
Hydrogen Bonds ◽  
Lithium Nitrate ◽  
Nitrate Trihydrate

A temperature-responsive poly(vinyl alcohol) gel for controlling fluidity of an inorganic phase change material

2017 ◽  
Vol 5 (24) ◽  
pp. 12474-12482 ◽  
Author(s):  
Parvin Karimineghlani ◽  
Emily Emmons ◽  
Micah J. Green ◽  
Patrick Shamberger ◽  
Svetlana A. Sukhishvili
Keyword(s):  
Heat Exchange ◽  
Phase Change ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Lithium Nitrate ◽  
Temperature Responsive ◽  
Nitrate Trihydrate ◽  
Pva Gel ◽  
Response To Temperature ◽  
Change Material

A temperature-responsive PVA gel is achieved that reversibly holds fluid lithium nitrate trihydrate and releases it in response to temperature for easy gelling in-place and later removal from heat-exchange modules.

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.

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