Convection and surface radiation heat losses from modified cavity receiver of solar parabolic dish collector with two-stage concentration

Reddy, K. S.; Natarajan, Sendhil Kumar

doi:10.1007/s00231-008-0440-2

Cited by 56 publications

(19 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Hinojosa et al [16] used the Boussinesq approximation in the numerical study of natural convection and surface thermal radiation in an open cavity. Reddy and Sendhil Kumar [17] reported numerical results of natural convection and radiation heat transfer in a modified cavity receiver. Using asymptotic computational fluid dynamics approach Sendhil Kumar [18] numerically investigated combined natural convection and radiation heat loss from a modified cavity receiver.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Ngo

Bello‐Ochende

Meyer

2015

Energy Conversion and Management

View full text Add to dashboard Cite

The numerical study and optimization of combined laminar natural convection and surface radiation heat transfer in solar cavity receiver with plate fins is presented in this paper. Minimizing heat loss in cavity receivers is seen as an effective way to enhance the thermal performance and the use of plate fins has been proposed as a low cost means to minimize heat loss. Firstly, the influence of operating temperature, emissivity of the surface, orientation and the geometric parameters on the total heat loss from the receiver was investigated. It was observed that convective heat loss is largely affected by the angle of inclination of the receiver, the presence of fins and the number of fins in the receiver. As for the radiation heat loss it was observed that it is mainly influenced by the properties of the cavity receiver surface. The radiation heat loss was found to be constant at all the angles of the receiver. Significant reduction in natural convection heat loss from the cavity receiver was accomplished by using the plate fins whereas radiation heat loss was marginally reduced by about 5%. Secondly, the optimization was conducted to obtain the optimal fin geometry and lastly, the overall thermal efficiency of the receiver was presented at different operating temperatures. The overall cavity efficiency marginally increased by approximately 2% with the insertion of fin plates although the convective heat loss was suppressed by about 20%. This is due to the fact that radiation heat loss dominates at high operating temperatures compared to convective heat loss.

show abstract

Section: Introductionmentioning

confidence: 99%

“…They observed that this cavity absorber performed better under medium temperatures. Reddy and Kumar [17] compared the thermal performance of the cavity receiver with extended reflectors of different geometries (CPC, cone and trumpet). They observed better performance from the trumpet one compared to the other ones.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Ngo

Bello‐Ochende

Meyer

2015

Energy Conversion and Management

View full text Add to dashboard Cite

show abstract

“…It has been observed for temperatures above 800 K, that the radiative exchange is far more important than convective heat transfer. 15,16 For example, Estrada et al 15 realized a numerical study of the heat transfer by natural convection with radiative exchange in an open cavity receiver, which indicates that the convective losses are negligible compared to the radiative losses at high temperature.…”

Section: B Methodologymentioning

confidence: 98%

Radiative heat transfer analysis of a directly irradiated cavity-type solar thermochemical reactor by Monte-Carlo ray tracing

Villafán-Vidales

Abanades

Arancibia-Bulnes

et al. 2012

Journal of Renewable and Sustainable Energy

View full text Add to dashboard Cite

Radiative heat transfer in a 1 kW cavity-type solar reactor devoted to the thermal reduction of compressed ZnO and SnO 2 powders is analyzed by a Monte Carlo ray tracing simulation. The developed model takes into account the radiative properties of the reactant particles and of the ceramic cavity walls, as well as the angular intensity distribution of the incoming concentrated solar irradiation. The model also includes the conduction heat losses through the lateral walls and the energy consumed by the endothermic chemical reaction. It is used to predict the temperature and the absorbed flux density profiles on the inner cavity walls for different main features of the reactor, concerning the dimensions of the cavity and the type of reactant. Results show that the absorbed flux density profile and the theoretical thermochemical efficiency change with the cavity aspect ratio and with the oxide reactant. The cavity with an aspect ratio of 3 and a SnO 2 pellet undergoing dissociation presents the highest thermochemical efficiency. Additionally, a different configuration of the reactor design is considered, which consists in implementing a layer of reactive particles on the inner lateral cavity wall. The model highlights that this type of reactor operation with a reactant layer on the lateral cavity wall results in an improved thermochemical efficiency. V C 2012 American Institute of Physics.

show abstract

“…This research focuses on solar dish concentrator as another alternative electricity source. Solar dish concentrator has advantages over concentrating collector due to the absence of cosine losses, high geometric concentration ratio and high temperature (Reddy et al 2009). The important part during developing solar dish concentrator is identifying suitable and economical materials.…”

Section: Introductionmentioning

confidence: 99%

Dish Concentrator Performance Based on Various Materials for Hot Humid Weather

Nong¹,

Adam²,

Rashid³

et al. 2016

JKUKM

View full text Add to dashboard Cite

Convection and surface radiation heat losses from modified cavity receiver of solar parabolic dish collector with two-stage concentration

Cited by 56 publications

References 19 publications

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Three-dimensional analysis and numerical optimization of combined natural convection and radiation heat loss in solar cavity receiver with plate fins insert

Radiative heat transfer analysis of a directly irradiated cavity-type solar thermochemical reactor by Monte-Carlo ray tracing

Dish Concentrator Performance Based on Various Materials for Hot Humid Weather

Contact Info

Product

Resources

About