Experimental characterization of the heat transfer in a free-falling-particle receiver

Rightley, Michael J.; Matthews, L. K.; Mulholland, G. P.

doi:10.1016/0038-092x(92)90045-c

Cited by 31 publications

(10 citation statements)

References 2 publications

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“…This first-order equation with partial derivatives will be solved by realizing that, first, ð(Ñ,ß) must be normalized and, second, The initial condition (15) has to be fulfilled. The first requirement meaiis that By performing these computations we obtain eq.…”

Section: Discussionmentioning

confidence: 99%

“…This would allow to derive the best operation conditions for gasification but also some statistic measures for the fluctuations of the products rate. A new technique of solar energy conversion is the free-falling particle receiver, known also as the direct absorption solar receiver [15]. Its design allows the working medium (a large number of small solid falling particles) to be introduced directly into the receiver cavity which is then exposed to the incoming concentrated solar energy.…”

Section: Power Productionmentioning

confidence: 99%

“…(13) -(15) can be found. When higher order reactions are considered, solving the master equations associated with them is a difficult task which requires further investigations.…”

mentioning

confidence: 98%

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Probabilistic Finite Time Thermodynamics: A Chemically Driven Engine

Bădescu¹,

Andresen²

1996

Journal of Non-Equilibrium Thermodynamics

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The methods of finite-time thermodynamics are complemented with some probabilistic concepts allowing a more accurate description of the performance indicators of a power system. A chemical reaction is studied. The model is a flow reactor coupled by a heat exchanger to an engine. The probabilistic approach put into evidence the existence of a maximum flow rate in the reactor which, when exceeded, with some probability does not allow the reaction to start and, consequently, the power to be generated. The power fluctuations depend on the initial concentration of the fuel, i.e. on its quality. The model is also appropriate for solid fuels. All the statistical indicators show that there is a finite flow rate that yields maximum engine power, and that the maximum fuel efficiency is always attained at the uninteresting limit of zero flow rate.

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Section: Discussionmentioning

confidence: 99%

Section: Power Productionmentioning

confidence: 99%

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Probabilistic Finite Time Thermodynamics: A Chemically Driven Engine

Bădescu¹,

Andresen²

1996

Journal of Non-Equilibrium Thermodynamics

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“…5,6 Some numerical and experimental studies have been done to understand the particle dynamics with and without heat transfer. [7][8][9] Researchers at SNL have also considered other particulate materials for their SPR concept. 2,10 These types of particles are engineered materials that exhibit high absorptance and/or durability while remaining suitable for operation at temperatures as high as 1000°C.…”

Section: Introductionmentioning

confidence: 99%

Experimental measurements of thermal properties of high-temperature refractory materials used for thermal energy storage

El–Leathy

Jeter²,

Al-Ansary³

et al. 2016

AIP Conference Proceedings

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, and Zeyad Al-Suhaibani Abstract. This paper builds on studies conducted on thermal energy storage (TES) systems that were built as a part of the work performed for a DOE-funded SunShot project titled "High Temperature Falling Particle Receiver". In previous studies, two small-scale TES systems were constructed for measuring heat loss at high temperatures that are compatible with the falling particle receiver concept, both of which had shown very limited heat loss. Through the course of those studies, it became evident that there was a lack of information about the thermal performance of some of the insulating refractory materials used in the experiments at high temperatures, especially insulating firebrick and perlite concrete. This work focuses on determining the thermal conductivities of those materials at high temperatures. The apparatus consists of a prototype cylindrical TES bin built with the same wall construction used in previous studies. An electric heater is placed along the centerline of the bin, and thermocouples are used to measure temperature at the interfaces between all layers. Heat loss is measured across one of the layers whose thermal conductivity had already been well established using laboratory experiments. This value is used to deduce the thermal conductivity of other layers. Three interior temperature levels were considered; namely, 300°C, 500°C, and 700°C. Results show that the thermal conductivity of insulating firebrick remains low (approximately 0.22 W/m.K) at an average layer temperature as high as 640°C, but it was evident that the addition of mortar had an impact on its effective thermal conductivity. Results also show that the thermal conductivity of perlite concrete is very low, approximately 0.15 W/m.K at an average layer temperature of 360°C. This is evident by the large temperature drop that occurs across the perlite concrete layer. These results should be useful for future studies, especially those that focus on numerical modeling of TES bins.

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“…Optical characterization of master beads and other particle materials was conducted [5,6]. Some numerical and experimental studies were performed to understand the particle dynamics with and without heat transfer [7][8][9]. Researchers at SNL also considered other particulate materials for their solid particle receiver (SPR) concept [2,10].…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Evaluation of Two Thermal Energy Storage Tank Design Concepts for Use with a Solid Particle Receiver-Based Solar Power Tower

et al. 2014

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This paper presents the results of an extensive study of two thermal energy storage (TES) systems. The goal of the research is to make solar energy cost-competitive with other forms of electricity. A small-scale TES system was first built. The inner to outer layers were made of firebrick (FB), autoclaved aerated concrete (AAC) and reinforced concrete brick (CB). The experiments were conducted at temperatures of up to 1000 °C for sustained periods of time. AAC was found to be prone to cracking at temperatures exceeding 900 °C; as a result, AAC was eliminated from the second TES system. The second, larger-scale TES system was subsequently built of multiple layers of readily available materials, namely, insulating firebrick (IFB), perlite concrete (PC), expansion joint (EJ), and CB. All of the surfaces were instrumented with thermocouples to estimate the heat loss from the system. OPEN ACCESSEnergies 2014, 7 8202The temperature was maintained at approximately 800 °C to approximate steady state conditions closely. The steady state heat loss was determined to be approximately 4.4% for a day. The results indicate that high-temperature TES systems can be constructed of readily available materials while meeting the heat loss requirements for a falling particle receiver system, thereby contributing to reducing the overall cost of concentrating solar power systems.

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Experimental characterization of the heat transfer in a free-falling-particle receiver

Cited by 31 publications

References 2 publications

Probabilistic Finite Time Thermodynamics: A Chemically Driven Engine

Probabilistic Finite Time Thermodynamics: A Chemically Driven Engine

Experimental measurements of thermal properties of high-temperature refractory materials used for thermal energy storage

Thermal Performance Evaluation of Two Thermal Energy Storage Tank Design Concepts for Use with a Solid Particle Receiver-Based Solar Power Tower

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