Flux Measurement of a New Beam-down Solar Concentrating System in Miyazaki for Demonstration of Thermochemical Water Splitting Reactors

Kodama, Tetsuya; Gokon, Nobuyuki; Matsubara, Koji; Yoshida, Kazuo; Koikari, Souji; Nagase, Yoshinori; Nakamura, Katsushige

doi:10.1016/j.egypro.2014.03.211

Cited by 46 publications

(12 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Another beam-down approach has been recently presented in (Gómez-Hernández et al, 2017) where, instead of focusing on a single point, the beam-down reflector concentrates linearly on the particle receiver while the solids are moving horizontally. Therefore, the beam-down with a ground receiver approach enhances the application of fluidized bed technology to thermochemical processes (Segal and Epstein, 1997,Segal and Epstein, 2003,Kodama et al, 2010,Gokon et al, 2012, or energy capture processes (Calvet et al, 2016,Kodama et al, 2013,Kodama et al, 2017.…”

Section: Introductionmentioning

confidence: 99%

Two-phase heat transfer model of a beam-down gas-solid fluidized bed solar particle receiver

et al. 2018

View full text Add to dashboard Cite

show abstract

Section: Introductionmentioning

confidence: 99%

Two-phase heat transfer model of a beam-down gas-solid fluidized bed solar particle receiver

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The total mirror area of the heliostats is 176 m 2 . Figure 6 shows the distribution of heat flux at the second focal point of the elliptical mirror [8]. The peak of the flux was as high as 500 kW/m 2 .…”

Section: Numerical Computation Of Fluidized Receivermentioning

confidence: 98%

Numerical Modeling of a Two-tower Type Fluidized Receiver for High Temperature Solar Concentration by a Beam-down Reflector System

et al. 2015

Self Cite

View full text Add to dashboard Cite

This study describes the flow and thermal field of a two-tower fluidized receiver, aimed to be incorporated into a beam-down reflector system. An experimental visualization and numerical simulation were made to accumulate phenomenological knowledge, in order to complete the design of a demonstration model. Visualization of the cold particle bed with no irradiation revealed that global circulation occurs between the two towers by the aeration with different line velocities. The numerical simulation revealed that this global circulation enhances the transport of sensible heat from the irradiated layer in the high pressure tower to the low pressure tower. The global circulation in the two-tower fluidized receiver has the potential to be extended for use in a thermal receiver and direct storage system. Unexpectedly, local circulations occur on the high and low pressure sides, and are stronger than the global circulation. These local circulations contribute to the thermal mixing in each tower. The bottom distributor on the low pressure side can cause an uprising flow which leads to the local circulation. The design of the distributor is suggested to be elaborated based on these findings.

show abstract

“…再生可能エネルギーの中で太陽光利用への社会的関心は高く，太陽電池ばかりでなく太陽熱を利用した発電プラントの建設(NEDO, 2016)や燃料製造のための研究 (Kodama et al, 2014)も進められている．太陽熱利用のメリットの一つは蓄熱であり，蓄電と比較して安価にエネルギーを貯蔵できる．また，蓄熱装置を備えた太陽熱発電装置は，日射の変動による発電量の変動を緩和し，さらに夜間でも発電することが可能となる．これまでの太陽熱の蓄熱装置は，溶融塩の潜熱 (Abhat, 1983)を利用したものが主流であり，溶融塩は高温になると化学的な分解を起こすことから 600℃以下の使用に限定されるため，トラフ型太陽集光装置 (Morisson et al, 2008) (Michels and Pitz-Paal., 2007)で主に使用されている．タワー型太陽集光装置での蓄熱材に溶融塩を用いた研究 (Hasuike et al, 2006)があるが，前述の理由からタワー型太陽集光装置のメリットである高温での蓄熱を…”

Section: 緒言unclassified

Development of a mechanical mixing system of sensible heat storage equipment for a beam down solar concentrator

Nagase

Mori

Tomomatsu

et al. 2017

Transactions of the JSME (In Japanese)

View full text Add to dashboard Cite

One of the merits of a solar thermal utility is that the cost of heat storage is lower than that of an electrical battery. Furthermore, a power generation system using solar thermal energy with heat storage equipment is capable of stabilizing its output. For a parabolic trough solar concentrator, molten salt is adopted as the heat storage material using latent heat. However, molten salt is applicable only up to 600 °C; this temperature is not sufficiently high for adaptation to a solar central receiver system. Therefore, we designed and produced sensible heat storage equipment for a beam down solar concentrator (a central receiver system) to offer higher temperature storage. Heat storage materials in this device are mechanically mixed, and receive the concentrated sunlight on the focal plane of the solar concentrator. First, the radiation flux distribution under CPC (Compound Parabolic Concentrator) was measured using thin film heat flux sensors to obtain the input energy for the storage equipment. Next, an experiment was carried out using the storage equipment and the beam down solar concentrator. The maximum temperature was found to reach 1070 °C at the center of the heat storage tank in this experimental conditions, and the stored energy was approximately 14 % of the incident energy.

show abstract

Flux Measurement of a New Beam-down Solar Concentrating System in Miyazaki for Demonstration of Thermochemical Water Splitting Reactors

Cited by 46 publications

References 3 publications

Two-phase heat transfer model of a beam-down gas-solid fluidized bed solar particle receiver

Two-phase heat transfer model of a beam-down gas-solid fluidized bed solar particle receiver

Numerical Modeling of a Two-tower Type Fluidized Receiver for High Temperature Solar Concentration by a Beam-down Reflector System

Development of a mechanical mixing system of sensible heat storage equipment for a beam down solar concentrator

Contact Info

Product

Resources

About