Optical design of compact linear fresnel reflector systems

Zhu, Jun; Chen, Ziwei

doi:10.1016/j.solmat.2017.12.016

Cited by 37 publications

(12 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is the combination of their action that converts solar radiation into heat. There are two families of LFC type: collectors with a single receiver, this is the standard and most widespread technology, and collectors with at least two receivers called Compact Linear Fresnel Reflector (CLFR) [7][8][9][10].…”

Section: Fig 1 a Lfr Overview [6]mentioning

confidence: 99%

A Review of Linear Fresnel Collector Receivers used in Solar Thermal Technology

Ko¹,

Gomna

Falcoz

et al. 2022

PSIJ

View full text Add to dashboard Cite

Linear Fresnel collectors (LFC) have, among the four technologies of concentrating solar power (CSP), the simpler technology. They have a one axis sun tracking, plane mirrors and a fix receiver. All these elements make them the most suitable for small scales CSP plants adapted to rural area of the Sub-Saharan region. The receiver is an important part of the LFC. There is a wide variety of receivers that differ in the shape of the absorber: mono-tube, multi-tube, plane. The shape of the secondary concentrator or its absence allows to categorize the receivers in a butterfly, compound parabolic concentrator, segmented parabolic secondary concentrator or trapezoidal receiver. Vacuum mono-tube receivers have heat losses between 200 W/m and 270 W/m at an absorber temperature of 350°C. A mono tube receiver at partial vacuum losses more than 350 W/m at 350°C. The lowest heat losses of a multi-tube receiver with a trapezoidal secondary concentrator can reach 500 W/m at an absorber temperature of 350°C. This paper discusses a comparative study of existing receiver designs in order to find the most suitable for rural areas in the sub-Saharan region, i.e. easy to design by hand and low cost. Although they do not have the best thermal performance, trapezoidal receivers with a black-painted copper multi-tube absorber and a glass cover seem to be the most suitable.

show abstract

Section: Fig 1 a Lfr Overview [6]mentioning

confidence: 99%

A Review of Linear Fresnel Collector Receivers used in Solar Thermal Technology

Ko¹,

Gomna

Falcoz

et al. 2022

PSIJ

View full text Add to dashboard Cite

show abstract

“…Based on their results, by implementing the theory of variable aim lines, the distribution of circumferential flux on the absorber pipe must be developed considerably. Zhu and Chen (2018) presented various designs of compact LFR concentrator. Additionally, they simulate and empirically analyzed the solar concentrating efficiency of such LFR.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer within linear Fresnel unit using parabolic reflector

Ebrahimpour

Farshad

Sheikholeslami

2022

HFF

View full text Add to dashboard Cite

Purpose This paper scrutinizes exergy loss and hydrothermal analysis of Linear Fresnel Reflector (LFR) unit by means of FLUENT. Several mirrors were used to guide the solar radiation inside the receiver, which has parabolic shape. Radiation model was used to simulate radiation mode. Design/methodology/approach Heat losses from receiver should be minimized to reach the optimized design. Outputs were summarized as contours of incident radiation, isotherm and streamline. Outputs were classified in terms of contours and plots to depict the influence of temperature of hot wall, wind velocity and configurations on performance of Linear Fresnel Reflector (LFR) based on thermal and exergy treatment. Four arrangements for LFR units are considered and all of them have same height. Findings Greatest Nu and Ex can be obtained for case D due to the highest heat loss from hot wall. Share of radiative heat flux relative to total heat flux is about 94% for case D. In case D when Tr = 0.388, As hext rises from 5 to 20, Nutotal enhances about 11.42% when Tr = 0.388. By selecting case D instead of case A, Ex rises about 16.14% for lowest Tr. Nutotal and Ex of case D augment by 3.65 and 6.23 times with rise of Tr when hext = 5. To evaluate the thermal performance (ηth) of system, absorber pipe was inserted below the parabolic reflector and 12 mirrors were used above the ground. The outputs revealed that ηth decreases about 14.31% and 2.54% with augment of Tin and Q if other factors are minimum. Originality value This paper scrutinizes exergy loss and hydrothermal analysis of LFR unit by means of finite volume method. Several mirror used to guide the solar radiation inside the receiver, which has parabolic shape. DO model was used to simulate radiation mode. Heat losses from receiver should be minimized to reach the optimized design. Outputs were summarized as contours of incident radiation, isotherm and streamline.

show abstract

“…The results of both revealed good agreements. Zhu and Chen's [25] study presented several CLFRM (compact linear Fresnel reflector mirror) system designs. The experimental and simulation investigations of the CLFRM performance were carried out.…”

Section: Introductionmentioning

confidence: 99%

Design, Modeling, and Experimental Investigation of Active Water Cooling Concentrating Photovoltaic System

et al. 2020

View full text Add to dashboard Cite

This work presents performance study of a concentrating photovoltaic/thermal (CPV/T) collector and its efficiency to produce electric and thermal power under different operating conditions. The study covers a detailed description of flat photovoltaic/thermal (PV/T) and CPV/T systems using water as a cooling working fluid, numerical model analysis, and qualitative evaluation of thermal and electrical output. The aim of this study was to achieve higher efficiency of the photovoltaic (PV) system while reducing the cost of generating power. Concentrating photovoltaic (CPV) cells with low-cost reflectors were used to enhance the efficiency of the PV system and simultaneously reduce the cost of electricity generation. For this purpose, a linear Fresnel flat mirror (LFFM) integrated with a PV system was used for low-concentration PV cells (LCPV). To achieve the maximum benefit, water as a coolant fluid was used to study the ability of actively cooling PV cells, since the electrical power of the CPV system is significantly affected by the temperature of the PV cells. This system was characterized over the traditional PV systems via producing more electrical energy due to concentrating the solar radiation as well as cooling the PV modules and at the same time producing thermal energy that can be used in domestic applications. During the analysis of the results of the proposed system, it was found that the maximum electrical and thermal energy obtained were 170 W and 580 W, respectively, under solar concentration ratio 3 and the flow rate of the cooling water 1 kg/min. A good agreement between the theoretical and experimental results was confirmed.

show abstract

Optical design of compact linear fresnel reflector systems

Cited by 37 publications

References 31 publications

A Review of Linear Fresnel Collector Receivers used in Solar Thermal Technology

A Review of Linear Fresnel Collector Receivers used in Solar Thermal Technology

Heat transfer within linear Fresnel unit using parabolic reflector

Design, Modeling, and Experimental Investigation of Active Water Cooling Concentrating Photovoltaic System

Contact Info

Product

Resources

About