The heat transfer coefficient associated with a moving packed bed of silica particles flowing through parallel plates

Maskalunas, Jeffrey; Nellis, Gregory; Anderson, Mark

doi:10.1016/j.solener.2022.01.052

Title: The heat transfer coefficient associated with a moving packed bed of silica particles flowing through parallel plates

Journal Article · 11 February 2022 · Solar Energy

DOI: https://doi.org/10.1016/j.solener.2022.01.052 · OSTI ID:1977653

Maskalunas, Jeffrey ^[1]; Nellis, Gregory ^[2]; Anderson, Mark ^[2]

Univ. of Wisconsin, Madison, WI (United States). Solar Energy Lab. (SEL); OSTI
Univ. of Wisconsin, Madison, WI (United States). Solar Energy Lab. (SEL)

Concentrating Solar Power (CSP) with thermal energy storage has the potential to be a renewable energy technology with long duration, inexpensive energy storage. Higher temperature operation increases the conversion efficiency and reduces the cost of energy storage. Several emerging CSP designs utilize particles as the solar receiver due to their high temperature stability and low cost. In some designs, the particles are also used as the thermal energy storage (TES) media. In either configuration, an energy transfer is required between the hot particles and the working fluid in the power cycle in a Particle-to-Fluid Heat Exchanger (PtFHX). Understanding the heat transfer between a moving packed bed and a stationary surface is critical to the successful design of a PtFHX. In this paper, a test facility is described in which a moving packed bed of silica sand with particle size 100–600 μm is introduced into the channel formed by two parallel plates, one of which is heated. The effective static thermal conductivity of the particles used for the test are separately measured over the entire range of test temperatures. The inlet and outlet bulk temperatures of the particle flow are measured as are the surface temperatures at several axial locations along the centerline of the plate. The result is the measurement of heat transfer coefficient as a function of temperature for several velocities. The uncertainty of the measurements is presented and the results are compared to model results found in the literature.

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Research Organization:: Brayton Energy, LLC, Hampton, NH (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE); National Science Foundation (NSF)

Grant/Contract Number:: EE0008368

OSTI ID:: 1977653

Journal Information:: Solar Energy, Journal Name: Solar Energy Journal Issue: C Vol. 234; ISSN 0038-092X

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Title: The heat transfer coefficient associated with a moving packed bed of silica particles flowing through parallel plates

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