Reducing the convective losses of cavity receivers

Flesch, Robert; Grobbel, Johannes; Stadler, Hannes; Uhlig, Ralf; Hoffschmidt, Bernhard

doi:10.1063/1.4949066

Cited by 19 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Instead of using window panes to cover the cavity receiver, McMillan (1984) has proposed to use an aerowindow which can help in significantly reducing convective losses. This concept has been tested for particle receivers by Tan et al (2009) and has been investigated numerically by Flesch et al (2016). All researchers conclude that a reduction of the convective losses can be achieved, values of up to 40% are reported.…”

Section: State Of the Artmentioning

confidence: 98%

Improved performance of open volumetric receivers by employing an external air return system

Stadler¹,

Tiddens²,

Schwarzbözl³

et al. 2017

Solar Energy

Self Cite

View full text Add to dashboard Cite

In solar central receiver power plants open volumetric receivers using air as heat transfer fluid are an alternative to the currently predominant receiver types, namely salt and steam receivers. In order to improve their competitiveness, the receiver performance has to be improved. In the current study an external air return system has been integrated in the Solar Tower Jülich and its influence on power plant performance has been investigated. With this system, the parasitic losses caused by the fans are reduced by up to 34%. The measured air return ratio is mostly unaffected, but the current data suggest, that the internal and external convective losses of the receiver are reduced when an external air return system is applied. A positive influence of the total mass flow on the air return ratio has been identified for the current data while other parameters like the return air temperature turned out to be less significant.

show abstract

Section: State Of the Artmentioning

confidence: 98%

Improved performance of open volumetric receivers by employing an external air return system

Stadler¹,

Tiddens²,

Schwarzbözl³

et al. 2017

Solar Energy

Self Cite

View full text Add to dashboard Cite

show abstract

“…Previous work with cavity cavities [15][16][17][18] and convex central tower receivers [19] has highlighted the potential reduction (~40%) in convective heat loss which can be achieved through the use of air jets and air curtains, especially in no-wind conditions. It is less clear whether active airflow features can cost-effectively reduce heat loss for a receiver during windy conditions.…”

Section: Active Airflow Featuresmentioning

confidence: 99%

Optical and thermal performance of bladed receivers

Pye

Coventry

et al. 2017

AIP Conference Proceedings

View full text Add to dashboard Cite

Abstract. Bladed receivers use conventional receiver tube-banks rearranged into bladed/finned structures, and offer better light trapping, reduced radiative and convective losses, and reduced tube mass, based on the presented optical and thermal analysis. Optimising for optical performance, deep blades emerge. Considering thermal losses leads to shallower blades. Horizontal blades perform better, in both windy and no-wind conditions, than vertical blades, at the scales considered so far. Air curtains offer options to further reduce convective losses; high flux on blade-tips is still a concern.

show abstract

“…There are several techniques have been proposed to enhance the operating functionality of CSP receivers. Active airflow control in the form of an air curtain is a recognized strategy to minimize convective heat losses from CSP receivers, however, most of the works have been focused on cavity receivers [1,6,7,10,12,17,18]. Air curtain is often restricted to reduce heat transfer between horizontally linked volumes.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Air Curtains for Natural Convection Heat-Loss Mitigation

Mondal¹,

Torres²,

Hughes³

et al. 2020

Australasian Fluid Mechanics Conference (AFMC)

View full text Add to dashboard Cite

Concentrated solar power systems provide an economical form of dispatchable electricity. However, significant energy losses arise in natural convection boundary layers on the solar thermal receiver surface. An air curtain can be used to reduce these losses, and this study presents a CFD model in OpenFOAM where optimal configurations are examined. Analogous to an external CSP receiver, we model a 1.8-metre high isothermal plate with a downward-facing planar-jet air curtain near the upper edge. Turbulent natural convection rises up the plate and the flow is found similar to that of an external CSP receiver. Results confirm that local convective heat losses can be reduced via a stagnant zone that is created at the top of the plate. Optimal air curtain speeds and angles are identified.

show abstract

Reducing the convective losses of cavity receivers

Cited by 19 publications

References 9 publications

Improved performance of open volumetric receivers by employing an external air return system

Improved performance of open volumetric receivers by employing an external air return system

Optical and thermal performance of bladed receivers

Analysis of Air Curtains for Natural Convection Heat-Loss Mitigation

Contact Info

Product

Resources

About