Thermal performance and pressure drop of rock beds with large storage materials

A study on sensible thermal energy storage (TES) for high temperature solar systems is numerically accomplished. The high temperature TES is cylindrical, the fluid and the solid thermo-physical properties are temperature independent and the radiation heat transfer mechanism is neglected. A parametric analysis is carried out. The commercial CFD Fluent code is used to solve the governing equations in the transient regime. Numerical simulations are carried out at different mass velocity values of the heat-carrying fluid and porosity of the storage medium. The results show the effects of the porosity and of the working fluid mass velocity on the stored thermal energy and on the storage time.

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“…However, thermal performance of the system may deteriorate due to the smaller area of contact available for heat transfer [23].…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of sensible thermal energy storage in high temperature solar systems

Andreozzi¹,

Bianco²,

Manca³

et al. 2009

WIT Transactions on Modelling and Simulation

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“…This is frequently modeled using air as the working fluid [11], however in this case where the HTF is used, the fluid heat capacity term cannot be neglected [12]. Furthermore, the infinite NTU assumption is made, as temperature gradients within bed particles and pore volumes can be neglected for the purposes of establishing a computationally efficient energy balance and temperature profile for a thermally buffered Solar ORC system.…”

Section: Storage/buffer Modelmentioning

confidence: 99%

Sorce: A Design Tool for Solar Organic Rankine Cycle Systems in Distributed Generation Applications

Orosz¹,

Quoilin²,

Hemond³

2010

Proceedings of the EuroSun 2010 Conference

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SynopsisRecent interest in small-scale solar thermal combined heat and power (CHP) power systems has coincided with demand growth for distributed electricity supplies in areas poorly served by centralized power stations. One potential technical approach to meeting this demand is the parabolic trough solar thermal collector coupled with an organic Rankine cycle (ORC) heat engine. Much existing research touches on aspects of the underlying physics and mechanics of this technology, but a holistic treatment including economic evaluation is lacking. Design and analysis tools are needed to specify the solar collector and power block configurations for meeting performance and financial targets for a range of applications in disparate environments. In this paper we present the Solar Organic Rankine Cycle Economic (SORCE) model combining semi-empirical multi-physics computation modules for solar resource and site environmental parameter characterization along with optical, thermal and electromechanical performance prediction of trough collectors and ORC systems with technical specifications and costs of standard system equipment. The model is tested with data from experimental solar ORC systems at MIT and deployed in Lesotho, southern Africa (29°12'48.44"S, 27°51'37.36"E). SORCE is available for download 1 as an executable program derived from Engineering Equation Solver (EES) that enables site-specific evaluation of a solar ORC system for performance and cost comparison with alternatives (e.g. wind, solar PV, diesel, etc.).

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“…The temperature at the entry of the element is 'T f m ' and on exit, it is at 'T f m+1 '. Schumann (1929) has modeled the thermal behavior of packed beds, which was extended by Sagara and Nakahara (1991). The model estimates the mean fluid and solid material temperatures at a given cross section as a function of time and axial position.…”

Section: Experimental Study On Heat Transfer Coefficient and Frictionmentioning

confidence: 99%

Experimental Study on Heat Transfer Coefficient and Friction Factor of Al2O3 Nanofluid in A Packed Bed Column

Rao¹,

Sharma²,

Chary³

et al. 2011

J MECH ENG SCI

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The forced convection heat transfer coefficient and friction factor are determined for the flow of water and nanofluid in a vertical packed bed column. The analysis is undertaken in the laminar and transition Reynolds number range. The column is filled with spherical glass beads as the bed material. The heat transfer coefficients with Al 2 O 3 nanofluid increased by 12% to 15% with the increase of volume concentration from 0.02% to 0.5% compared with water. The experimental values of axial temperature are in good agreement with the NTU-ε method proposed by Schumann's model.

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Thermal performance and pressure drop of rock beds with large storage materials

Cited by 60 publications

References 5 publications

Numerical investigation of sensible thermal energy storage in high temperature solar systems

Numerical investigation of sensible thermal energy storage in high temperature solar systems

Sorce: A Design Tool for Solar Organic Rankine Cycle Systems in Distributed Generation Applications

Experimental Study on Heat Transfer Coefficient and Friction Factor of Al2O3 Nanofluid in A Packed Bed Column

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