scholarly journals Performance Testing and Lessons Learned From the Development of a Prototype 100 Kwt Moving Packed-Bed Particle-to-Sco2 Heat Exchanger

2021 ◽  
Author(s):  
Kevin Albrecht ◽  
Matthew Carlson ◽  
Hendrik Laubscher ◽  
Nicolas Delovato ◽  
Clifford K. Ho
Keyword(s):  
Heat Exchanger ◽  
Performance Testing ◽  
Packed Bed ◽  
Lessons Learned

scholarly journals Testing and model validation of a prototype moving packed-bed particle-to-sCO2 heat exchanger

2020 ◽  
Author(s):  
Kevin J. Albrecht ◽  
Matthew D. Carlson ◽  
Hendrik F. Laubscher ◽  
Robert Crandell ◽  
Nicolas DeLovato ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Model Validation ◽  
Packed Bed

Binary Particle Mixtures as a Heat Transfer Media in Shell-and-Plate Moving Packed Bed Heat Exchangers

2021 ◽  
Author(s):  
Chase Ellsworth Christen
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
Particle Size ◽  
Heat Transfer Coefficient ◽  
Heat Exchanger ◽  
Heat Exchangers ◽  
Packed Bed ◽  
Particle Sizes ◽  
Overall Heat Transfer Coefficient ◽  
Solid Media

Solid particles are being considered in several high temperature thermal energy storage systems and as heat transfer media in concentrated solar power (CSP) plants. The downside of such an approach is the low overall heat transfer coefficients in shell-and-plate moving packed bed heat exchangers caused by the inherently low packed bed thermal conductivity values of the low-cost solid media. Choosing the right particle size distribution of currently available solid media can make a substantial difference in packed bed thermal conductivity, and thus, a substantial difference in the overall heat transfer coefficient of shell-and-plate moving packed bed heat exchangers. Current research exclusively focuses on continuous unimodal distributions of alumina particles. The drawback of this approach is that larger particle sizes require wider particle channels to meet flowability requirements. As a result, only small particle sizes with low packed bed thermal conductivities have been considered for the use in the falling-particle Gen3 CSP concepts. Here, binary particle mixtures, which are defined in this thesis as a mixture of two continuous unimodal particle distributions leading to a continuous bimodal particle distribution, are considered to increase packed bed thermal conductivity, decrease packed bed porosity, and improve moving packed bed heat exchanger performance. This is the first study related to CSP solid particle heat transfer that has considered the packed bed thermal conductivity and moving packed bed heat exchanger performance of bimodal particle size distributions at room and elevated temperatures. Considering binary particle mixtures that meet particle sifting segregation criteria, the overall heat transfer coefficient of shell-and-plate moving packed bed heat exchangers can be increased by 23% when compared to a monodisperse particle system. This work demonstrates that binary particle mixtures should be seriously considered to improve shell-and-plate moving packed bed heat exchangers.

scholarly journals Evaluation of Alternative Designs for a High Temperature Particle-to-sCO2 Heat Exchanger

2019 ◽  
Vol 141 (2) ◽  
Author(s):  
Clifford K. Ho ◽  
Matthew Carlson ◽  
Kevin J. Albrecht ◽  
Zhiwen Ma ◽  
Sheldon Jeter ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
High Temperature ◽  
Heat Exchanger ◽  
Transfer Coefficient ◽  
Fluidized Bed ◽  
Structural Reliability ◽  
Packed Bed ◽  
Heat Losses ◽  
Transient Operation

This paper presents an evaluation of alternative particle heat-exchanger designs, including moving packed-bed and fluidized-bed designs, for high-temperature heating of a solar-driven supercritical CO2 (sCO2) Brayton power cycle. The design requirements for high pressure (≥20 MPa) and high temperature (≥700 °C) operation associated with sCO2 posed several challenges requiring high-strength materials for piping and/or diffusion bonding for plates. Designs from several vendors for a 100 kW-thermal particle-to-sCO2 heat exchanger were evaluated as part of this project. Cost, heat-transfer coefficient, structural reliability, manufacturability, parasitics and heat losses, scalability, compatibility, erosion and corrosion, transient operation, and inspection ease were considered in the evaluation. An analytic hierarchy process was used to weight and compare the criteria for the different design options. The fluidized-bed design fared the best on heat transfer coefficient, structural reliability, scalability, and inspection ease, while the moving packed-bed designs fared the best on cost, parasitics and heat losses, manufacturability, compatibility, erosion and corrosion, and transient operation. A 100 kWt shell-and-plate design was ultimately selected for construction and integration with Sandia's falling particle receiver system.

CFD modeling and experimental validation of sulfur trioxide decomposition in bayonet type heat exchanger and chemical decomposer for different packed bed designs

2009 ◽  
Vol 34 (6) ◽  
pp. 2543-2557 ◽  
Author(s):  
Vijaisri Nagarajan ◽  
Valery Ponyavin ◽  
Yitung Chen ◽  
Milton E. Vernon ◽  
Paul Pickard ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Sulfur Trioxide ◽  
Experimental Validation ◽  
Packed Bed ◽  
Cfd Modeling

Usability and Performance Testing of Hand-held Data-entry Devices for Navy Shipboard Damage Control and Fire-fighting Environments

1995 ◽  
Vol 39 (14) ◽  
pp. 967-967
Author(s):  
James W. Broyles ◽  
Michael Christie
Keyword(s):  
Damage Control ◽  
Data Entry ◽  
Performance Testing ◽  
Field Testing ◽  
Training Group ◽  
Lessons Learned ◽  
Fire Fighting ◽  
Cooperative Research ◽  
And Performance ◽  
Treasure Island

Portable, hand-held, data-entry devices were evaluated for intended use by shipboard engineering repair team personnel for improving on-scene casualty reporting of damage control and fire-fighting efforts. Current on-scene reporting methods use pre-formatted damage control messages, hand carried from the scene of the casualty to the repair lockers, and often rely on two-way radios for rapid transmission of critical casualty information. During the initial reporting period, this process is often confusing, time-late, and sometimes ambiguous or error-prone. Five off-the-shelf data entry devices were tested for usability and performance for data input and display of casualty information in a laboratory setting at the Naval Postgraduate School, Monterey, with follow-on field testing done by damage control and fire-fighting personnel assigned to Fleet Training Center, San Diego and Detachment Treasure Island and the Afloat Training Group, Pacific. Demonstration of these devices, lessons learned on usability testing and building of cooperative research networks between users and the training community will be described.

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