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Air Brayton Cycle

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Peter G. Loutzenhiser – One of the best experts on this subject based on the ideXlab platform.

Andrew J Schrader – One of the best experts on this subject based on the ideXlab platform.

  • aluminum doped calcium manganite particles for solar thermochemical energy storage reactor design particle characterization and heat and mass transfer modeling
    International Journal of Heat and Mass Transfer, 2020
    Co-Authors: Andrew J Schrader, Evan H Bush, Devesh Ranjan, Peter G. Loutzenhiser
    Abstract:

    Abstract A two-step Cycle was considered for solar thermochemical energy storage based on particulate aluminum-doped calcium manganite reduction/oxidation reactions for direct integration into AirBrayton Cycles. The two steps encompass (1) the storage of concentrated solar irradiation within endothermic reduction of aluminum-doped calcium manganite and (2) the delivery of heat to an AirBrayton Cycle via exothermic re-oxidation of oxygen-deficient aluminum-doped calcium magnanite. A 5 kWth scale solar thermochemical reactor operating under vacuum was designed, modeled, and optimized to thermally reduce a continuous, gravity-driven flow of aluminum-doped calcium manganite particles. The granular flows were characterized in a tilt-flow rig, and particle image velocimetry was used to determine flow properties via frictional and velocity scaling relationships. Flow properties were integrated into a detailed heat and mass transfer model of the solar thermochemical reactor. A reactor design with 31° inclination angle, 230 g/min of particles, and 5.2 kWth radiative input from the high-flux solar simulator was found to produce an outlet flow temperature of 1158 K, with stoichiometric deviations of 0.076 and a storage efficiency of 0.628 while avoiding particle overheating and promoting longer particle residence times.

  • Experimental demonstration of a 5 kWth granular-flow reactor for solar thermochemical energy storage with aluminum-doped calcium manganite particles
    Applied Thermal Engineering, 2020
    Co-Authors: Andrew J Schrader, Gretchen L Schieber, Andrea Ambrosini, Peter G. Loutzenhiser
    Abstract:

    Abstract A two-step Cycle was considered for solar thermochemical energy storage based on aluminum-doped calcium manganite reduction/oxidation reactions for direct integration into Air Brayton Cycles. The two steps encompassed (1) the storage of concentrated solar direct irradiation via the thermal reduction of aluminum-doped calcium manganite and (2) the delivery of heat to an AirBrayton Cycle via re-oxidation of oxygen-deficient aluminum-doped calcium manganite. The re-oxidized aluminum-doped calcium manganite was fed back to the first step to complete the Cycle. A 5 kWth solar thermochemical reactor operating under vacuum was fabricated and tested to examine the first Cycle reduction step. Reactor operating conditions and high-flux solar simulator control were tuned for continuous reactor operation with particle temperatures >1073 K. Continuous operation was achieved using intermittent, dense granular flows. A maximum absorption efficiency of 64.7% was demonstrated, accounting for both sensible and chemical heat storage.

  • solar electricity via an Air Brayton Cycle with an integrated two step thermochemical Cycle for heat storage based on co 3 o 4 coo redox reactions iii solar thermochemical reactor design and modeling
    Solar Energy, 2017
    Co-Authors: Andrew J Schrader, Gianmarco De Dominicis, Gretchen L Schieber, Peter G. Loutzenhiser
    Abstract:

    Abstract A two-step solar thermochemical Cycle based on Co3O4/CoO redox reactions integrated into an Air Brayton Cycle is considered for thermochemical heat storage. The two-step Cycle encompasses (1) the thermal reduction of Co3O4 to CoO and O2 driven by concentrated solar irrairradiation and (2) the re-oxidation of CoO with O2 to Co3O4, releasing heat and completing the Cycle. An evacuated horizontal solar thermochemical reactor is proposed with an inclined slope and quartz window for promoting direct irradiation of dense, granular Co3O4/CoO flows. Mechanical analysis of flat and spherical quartz window designs for a 5 kWth scale prototype was performed to ensure window stability. Detailed mass and heat transfer analysis for a 5 kWth scale prototype was performed coupling Monte Carlo ray tracing for radiative heat exchange to the energy balances for the bed and the reactor. A parametric study of the reactor design was performed with varying cavity depth, particle inlet temperature, and solar concentration ratio. The optimal solar reactor design maximized conversion of Co3O4 to CoO and particle outlet temperature while preventing particle overheating and achieved a Co3O4 to CoO conversion of 0.91, particle outlet temperature of 1385 K, maximum flow temperature of 1572 K, and absorption efficiency of 0.76.

Gretchen L Schieber – One of the best experts on this subject based on the ideXlab platform.

  • Experimental demonstration of a 5 kWth granular-flow reactor for solar thermochemical energy storage with aluminum-doped calcium manganite particles
    Applied Thermal Engineering, 2020
    Co-Authors: Andrew J Schrader, Gretchen L Schieber, Andrea Ambrosini, Peter G. Loutzenhiser
    Abstract:

    Abstract A two-step Cycle was considered for solar thermochemical energy storage based on aluminum-doped calcium manganite reduction/oxidation reactions for direct integration into Air Brayton Cycles. The two steps encompassed (1) the storage of concentrated solar direct irradiation via the thermal reduction of aluminum-doped calcium manganite and (2) the delivery of heat to an AirBrayton Cycle via re-oxidation of oxygen-deficient aluminum-doped calcium manganite. The re-oxidized aluminum-doped calcium manganite was fed back to the first step to complete the Cycle. A 5 kWth solar thermochemical reactor operating under vacuum was fabricated and tested to examine the first Cycle reduction step. Reactor operating conditions and high-flux solar simulator control were tuned for continuous reactor operation with particle temperatures >1073 K. Continuous operation was achieved using intermittent, dense granular flows. A maximum absorption efficiency of 64.7% was demonstrated, accounting for both sensible and chemical heat storage.

  • solar electricity via an Air Brayton Cycle with an integrated two step thermochemical Cycle for heat storage based on co 3 o 4 coo redox reactions iii solar thermochemical reactor design and modeling
    Solar Energy, 2017
    Co-Authors: Andrew J Schrader, Gianmarco De Dominicis, Gretchen L Schieber, Peter G. Loutzenhiser
    Abstract:

    Abstract A two-step solar thermochemical Cycle based on Co3O4/CoO redox reactions integrated into an Air Brayton Cycle is considered for thermochemical heat storage. The two-step Cycle encompasses (1) the thermal reduction of Co3O4 to CoO and O2 driven by concentrated solar irradiation and (2) the re-oxidation of CoO with O2 to Co3O4, releasing heat and completing the Cycle. An evacuated horizontal solar thermochemical reactor is proposed with an inclined slope and quartz window for promoting direct irradiation of dense, granular Co3O4/CoO flows. Mechanical analysis of flat and spherical quartz window designs for a 5 kWth scale prototype was performed to ensure window stability. Detailed mass and heat transfer analysis for a 5 kWth scale prototype was performed coupling Monte Carlo ray tracing for radiative heat exchange to the energy balances for the bed and the reactor. A parametric study of the reactor design was performed with varying cavity depth, particle inlet temperature, and solar concentration ratio. The optimal solar reactor design maximized conversion of Co3O4 to CoO and particle outlet temperature while preventing particle overheating and achieved a Co3O4 to CoO conversion of 0.91, particle outlet temperature of 1385 K, maximum flow temperature of 1572 K, and absorption efficiency of 0.76.

Alexander P Muroyama – One of the best experts on this subject based on the ideXlab platform.

Ali Zare – One of the best experts on this subject based on the ideXlab platform.

  • Energy and exergy analysis of a novel turbo-compounding system for supercharging and mild hybridization of a gasoline engine
    Journal of Thermal Analysis and Calorimetry, 2020
    Co-Authors: Farhad Salek, Meisam Babaie, Ali Ghodsi, Seyed Vahid Hosseini, Ali Zare
    Abstract:

    Number of hybrid vehicles has increased around the world significantly. Automotive industry is utilizing the hybridization of the powertrain system to achieve better fuel economic and emissions reduction. One of the options recently considered in research for hybridization and downsizing of vehicles is to employ waste heatheat recovery systems. In this paper, the addition of a turbo-compound system with an Air Brayton Cycle (ABC) to a naturally aspirated engine was studied in AVL BOOST software. In addition, a supercharger was modeled to charge extra Air into the engine and ABC. The engine was first validated against the experimental data prior to turbo-compounding. The energy and exergy analysis was performed to understand the effects of the proposed design at engine rated speed. Results showed that between 16 and 18% increase in engine mechanical power can be achieved by adding turbo-compressor. Furthermore, the recommended ABC system can recover up to 1.1 kW extra electrical power from the engine exhaust energy. The energy and exergy efficiencies were both improved slightly by turbo-compounding and BSFC reduced by nearly 1% with the proposed system. Furthermore, installing the proposed system resulted in increase in backpressure up to approximately 23.8 kPa.