Characterization of Paraffin-Graphite Foam and Paraffin-Aluminum Foam Thermal Energy Storage Systems

Harris, Richard; Leland, Quinn; Afb, Wright-Patterson; Du, Jianhua; Chow, L. C.

doi:10.2514/6.2006-3132

Cited by 6 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Two input fluxes were used for experiments in this project, 2.3 or 6.0 W/cm 2 . These fluxes were used because they were the input fluxes used for the original effort from which this work was adapted (Harris et al (2006)), and the data generated here were initially intended to complement the data from the earlier effort. The 6.0 W/cm 2 setting was roughly the highest flux that the heater element could produce, given the sample cross section.…”

Section: Methodsmentioning

confidence: 99%

“…This project was originally intended as a continuation of a -wax-in-foam‖ characterization effort conducted by a different research team (Harris et al (2006)). One of the most difficult aspects of their project had been developing a method of sealing the samples so that the melted wax would not leak out.…”

Section: Sample Holdermentioning

confidence: 99%

“…They constitute the conductive path through which thermal energy will be added, stored, and removed from the system. Further information on the experimental apparatus can be found in Harris et al (2006). Installation of the three sample surface thermocouples was discontinued after the third sample test series.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Carbon foams, which provide not only the high surface area (on the order of 5000 m 2 surface area per m 3 bulk volume (Yu et al, 2006)), but also high thermal conductivity (on the order of 180 W/m o C (Gallego and Klett, 2003)), have attracted much attention. Harris et al (2006) characterized the thermal storage performance of infused carbon and aluminum foams using a paraffin; their results indicated that the temperature gradient of the carbon foam/PCM system was about 30% lower than that of the aluminum foam (typical thermal conductivity value 33 W/m o C) at the same heat flux. Py et al (2001) conducted experiments using impregnated foams formed by compressing mixtures of wax and graphite powder until the powder formed a conductive matrix.…”

Section: Chapter 1: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Carbon Foam Infused with Pentaglycerine for Thermal Energy Storage Applications

Johnson

2011

42nd AIAA Thermophysics Conference

View full text Add to dashboard Cite

A thermal energy storage device that uses pentaglycerine as a phase change material was developed. This solid-state phase change material was embedded in a carbon foam thermal conduction enhancer. This device and others identically constructed but using a paraffin phase change material were tested by imposing different input fluxes, 2.3 or 6.0 W/cm 2 on one end, while the opposite end was either insulated or actively cooled with an output flux that varied from 3.1 to 5.4 W/cm 2. The resulting temperature distributions within the devices were recorded at five locations; this information was used to determine the specific energy storage capacity, heating rate and the cycling performance of each device. It was found that the pentaglycerine/foam combination is capable of a specific storage capacity of 67 J/g; it demonstrated a storage capacity 174% of the paraffin/foam device, by eliminating the volume change and leakage problems associated with solid-liquid phase change materials.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Sample Holdermentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Chapter 1: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Carbon Foam Infused with Pentaglycerine for Thermal Energy Storage Applications

Johnson

2011

42nd AIAA Thermophysics Conference

View full text Add to dashboard Cite

show abstract

“…Because of these qualities, graphitic foams have attracted the attention of thermal scientists, and have been infiltrated with paraffin-based TES materials to increase heat transfer into a TES material [24,25]. However, native graphite is hydrophobic and therefore is not readily infiltrated by hydrous solutions.…”

Section: Wetting Of Graphite By Hydrous Salt Solutionsmentioning

confidence: 99%

Agile Thermal Management STT-RX. Towards High Energy Density, High Conductivity Thermal Energy Storage Composites (PREPRINT)

Shamberger¹,

Forero²

2011

View full text Add to dashboard Cite

The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Department of Defense, Washington Headquarters Services, Directorate for Information SPONSORING/MONITORING AGENCY REPORT NUMBER(S)AFRL-RX-WP-TP-2011-4417 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution unlimited. SUPPLEMENTARY NOTESThe U.S. Government is joint author of this work and has the right to use, modify, reproduce, release, perform, display, or disclose the work. PA Case Number and clearance date: 88ABW-2011-5381, 11 Oct 2011. Preprint journal article to be submitted to Proceedings of the ASME 2012 3rd Micro/Nanoscale Heat & Mass Transfer International Conference, March 3-6, 2012, Atlanta, Georgia. This document contains color. © 2011 by ASME ABSTRACTThermal 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. ABSTRACTThermal 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 rapi...

show abstract