Two-Fluid and Discrete Element Modeling of a Parallel Plate Fluidized Bed Heat Exchanger for Concentrating Solar Power

Appaswamy, Krutika; Schirck, Jason; Wedikkara, Chathusha Punchi; Morris, Aaron; Ma, Zhiwen

doi:10.1115/1.4065334

Two-Fluid and Discrete Element Modeling of a Parallel Plate Fluidized Bed Heat Exchanger for Concentrating Solar Power

Journal Article · 03 May 2024 · Journal of Solar Energy Engineering

DOI:https://doi.org/10.1115/1.4065334· OSTI ID:2367311

Appaswamy, Krutika; Schirck, Jason; Wedikkara, Chathusha Punchi; Morris, Aaron;

A novel high-temperature particle solar receiver is developed using a light trapping planar cavity configuration. As particles fall through the cavity, the concentrated solar radiation warms the boundaries of the receiver and in turn heats the particles. Particles flow through the system, forming a fluidized bed at the lower section, leaving the system from the bottom at a constant flowrate. Air is introduced to the system as the fluidizing medium to improve particle heat transfer and mixing. A laboratory scale cavity receiver is built by collaborators at the Colorado School of Mines and their data are used for model validation. In this experimental setup, near IR quartz lamp is used to provide flux to the vertical wall of the heat exchanger. The system is modeled using the discrete element method and a continuum two-fluid method. The computational model matches the experimental system size and the particle size distribution is assumed monodisperse. A new continuum conduction model that accounts for the effects of solid concentration is implemented, and the heat flux boundary condition matches the experimental setup. Radiative heat transfer is estimated using a widely used correlation during the post-processing step to determine an overall heat transfer coefficient. The model is validated against testing data and achieves less than 30% discrepancy and a heat transfer coefficient greater than 1000 W/m2 K.

Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE National Renewable Energy Laboratory (NREL)

DOE Contract Number:: AC36-08GO28308

OSTI ID:: 2367311

Report Number(s):: NREL/JA-5700-89984; MainId:91762; UUID:78eac9b8-3e9a-4c6f-93c5-f5f5effb2222; MainAdminId:72674

Journal Information:: Journal of Solar Energy Engineering, Journal Name: Journal of Solar Energy Engineering Journal Issue: 5 Vol. 146

Country of Publication:: United States

Language:: English

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