Advances in modeling high temperature particle flows in the field of concentrating solar power

Download

12626146.pdf

Date

2021-2-8

Author

Johnson, Evan F.

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

644
views

497
downloads

Within the field of concentrating solar power (CSP), central receiver (“tower”) type systems are capable of achieving temperatures reaching or exceeding 1000 ⁰C. To utilize this heat efficiently, a growing body of research points to the benefits of using solid, sand-like particles as a heat storage medium in CSP plants. Modeling capabilities for flowing groups of particles at high temperatures are lacking in several aspects, and thermal radiation in particle groups has received relatively little attention in research. This thesis focuses on developing the modeling capabilities needed to simulate heat transfer in solid particle solar receivers and heat exchangers using the Discrete Element Method (DEM), where particle mechanics and heat transfer are modeled at the particle scale. Several original contributions are made in this thesis: A) a 3D Monte Carlo Ray Tracing code is developed for modeling radiation for gray, uniformly sized particles, B) an expression for the effective thermal conductivity due to radiation is derived from Monte Carlo simulations, C) the “Distance Based Approximation” (DBA) model for radiative heat transfer in particle groups is developed, which can be implemented directly into DEM codes, D) an open source heat transfer code is developed for dense granular flows, named Dense Particle Heat Transfer (DPHT), which uses the DBA radiation model and several previously proposed heat conduction models to form a code which is readily usable for particle-based heat exchange devices, and E) the DPHT code is used to model a solar receiver for preheating of lime particles for calcination. In addition to modeling, experimental work on dense granular flows is carried out under a high-flux solar simulator, with particle temperatures reaching 750 ⁰C. Results show a relatively close match between experimental results and the newly developed DPHT heat transfer code.

Subject Keywords

Particle radiation, Discrete element method heat transfer, Monte Carlo radiation, Concentrating solar power, Dense granular flow heat transfer

URI

https://hdl.handle.net/11511/89717

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Modeling heat exchangers with an open source DEM-based code for granular flows Johnson, Evan F.; Tarı, İlker; Baker, Derek Keıth (Elsevier BV, 2021-11) Dense granular flows exist in many solid particle heat exchangers and solar receivers studied in the field of Concentrating Solar Power (CSP). By tracking particles individually with the Discrete Element Method (DEM), the details of particle friction, collisions, and mixing can be modeled accurately. An open source DEM-based code for modeling heat transfer in dense granular flows is presented, called Dense Particle Heat Transfer (DPHT). It uses one-way coupling, with DEM run first to find the particle posit...
Proposal of a Novel Gravity-Fed, Particle-Filled Solar Receiver JOHNSON, Evan; Baker, Derek Keıth; Tarı, İlker (2016-10-14) Solar Thermal Electricity power plants utilizing solid particles as heat transfer and storage media have been proposed by several research groups, with studies citing benefits of increased thermal efficiency and lower cost. Several types of solid particle receivers have been proposed, with leading designs consisting of particles falling or suspended in air. A new solid particle receiver is proposed here, consisting of a receiver fully packed with particles flowing downward with gravity. Particle flow rate i...
Comparison of Dynamic PTC Thermal Models Using Semi-Analytical and Finite Volume Methods Bayer, Özgür (2018-05-01) Resource potential estimation of concentrating solar power (CSP) applications with parabolic through collectors (PTC) needs to address time-dependent heat transfer fluid (HTF) temperature at collector field's outlet. HTF temperature distribution depends on several time-dependent variables; i.e., HTF temperature at PTC inlet, direct beam radiation, HTF flow rate and its properties, and PTC parameters, i.e., overall heat transfer coefficient. The present paper develops a time-dependent one-dimensional thermal...
Hydrodynamic ve Thermal Modelling of Circulating Fluidized Bed Solar Receivers Bilyaz, Serhat; Tarı, İlker (2016-11-17) The riser tube solar receiver of a circulating fluidized bed solid particle absorption solar thermal energy system was numerically modeled for analyzing hydrodynamic and heat transfer behaviors of the solid particles in the riser. Hydrodynamics of the model is validated by comparing radial distribution of void fractions with an experimental study. For the heat transfer from the opaque walls of the receiver that is heated to high temperatures by the solar rays concentrated by the heliostat field, a simple fr...
Optimizing the orientation of solar photovoltaic systems considering the effects of irradiation and cell temperature models with dust accumulation Al-Ghussain, Loiy; Taylan, Onur; Abujubbeh, Mohammad; Hassan, Muhammed A. (2023-01-01) To cope with the growing installation capacities of solar photovoltaic (PV) systems in desert areas, it is necessary to revisit the energy production models and the optimal angles of PV panels given the significant impacts of ambient temperature, wind speed, dust accumulation, and cleaning frequency. In this study, these four factors are examined for four PV technologies (polycrystalline, microcrystalline, monocrystalline, and thin-film) at three cities in Jordan, Egypt, and Tunisia using precise ground-lev...

Citation Formats

E. F. Johnson, “Advances in modeling high temperature particle flows in the field of concentrating solar power,” Ph.D. - Doctoral Program, Middle East Technical University, 2021.