Solar Linear Fresnel Reflector Research Articles

Performance analysis of an integrated pumped-hydro and compressed-air energy storage system and solar organic Rankine cycle

This research presents the performance study of a new energy storage system, i.e. Pumped-Hydro and Compressed-Air storage system, coupled with organic Rankine cycle (ORC) and Linear Fresnel solar reflector (LFR). The proposed cycle is capable of generating electricity and heat as well as storing storage. The LFR receives solar energy and turns it to the thermal power. The heat obtained from this way is used to supply heat to the evaporator of the ORC, and this system generates power. This power is then fed to the storage system pump. In the result section, the performances of storage system, solar and ORC systems, as well as coupled process are examined. The effect of key parameters such as operating pressures of the storage system, inlet temperature and pressure of organic fluid of the turbine of ORC, solar system inlet temperature and solar irradiance on process operation is examined. Furthermore, it is assumed that the solar collector works in the weather conditions of Esfahan (in Iran). The findings showed that the energy required by the pump and the energy level in the vessel for the isothermal process are 3.24 and 2.43 MJ/m3, respectively. These values were 2.79 and 2.09 MJ/m3, respectively, for the isentropic process. In addition, the system storage efficiency is equal to 60%. Furthermore, the isentropic process compared to isothermal process requires less solar collector area.

Solar LFR system with new cavity reflector employing DO model

AbstractIn current context, to achieve lower heat loss in Linear Fresnel reflector (LFR) unit, innovative configuration for cavity has been offered. This cavity consists of one hot circular wall and two inclined adiabatic walls. The below wall is made of glass and connect with outside air flow. The operating fluid is air and its features were temperature dependent. Inclination angle (θ), wind speed and circular wall temperature are variable factors. Both thermal and irreversibility behavior were analyzed in outputs. Finite volume method (FVM) was utilized for such 2D problem involving radiation source term. The incident radiation contours were reported which were obtained by implement of discrete ordinates (DO) model. Verification was done with comparing data with that of previous numerical publication. Stream function augments about 87.5% with augmentation of θ while changing the hot temperature cannot affect the strength of the eddy. Radiation mode is directly relevant to temperature difference, so lower glass temperature provides lower incident radiation. At lowest Th, augment of θ offers reduction in glass temperature and incident radiation about 2.27% and 12.94%. Given θ = 120o, reduce of Tr makes cold temperature to increase about 20.59%. Owing to augmentation of heat loss with rise of Th, θ and wind speed; all factors have direct relation with Nu and Nur. Temperature of circular wall has highest influence on Nu. With assumption of minimum values of other factors, Nu augments 19.63% and 65.07% with rise of hext and θ while it declines about 89.59% with increase of Tr. Irreversibility decreases about 86.38% with rise of Tr when θ = 120o, hext = 20. Given Th = 673 K, hext = 20, total entropy augments about 6.75% with employing greater angle.

Investigation of phosphoric acid fuel cell, linear Fresnel solar reflector and Organic Rankine Cycle polygeneration energy system in different climatic conditions

It has been proven that the future of energy demands for human society is related to clean energy sources such as solar energy. On the other hand, fuel cell technology converts the chemical energy of a fuel into electrical energy. Meanwhile, the polygeneration system based on (semi) renewable energy can be a viable alternative to conventional fuel-based systems. However, examining their performance for widespread implementation requires further and powerful studies. The aim of the present work is to evaluate the performance of the polygeneration energy system to produce electricity, heat, hydrogen and cool. The novel hybrid power system consists of the 10 kWel phosphoric acid fuel cell, linear Fresnel solar reflector (LFR), Organic Rankine Cycle (ORC) and Stirling engine (SE). In the novel energy conversion process proposed, the fuel cell generates electricity and heat, and its waste heat is used to generate additional electricity in the SE. The fuel and oxidant required by the fuel cell are supplied by an electrolyzer that is powered by an ORC system. A solar thermal collector provides the duty required by the evaporator of ORC system. The effect of key parameters such as current density, solar radiation and flow rate of hydrogen on the system energy and exergy performance is also investigated. To evaluate the performance of the LFR system the climatic conditions of Tehran (in Iran) and Beijing (in China) are considered. Results revealed that, the SE and ORC system separately generates 1.48 and 26.54 kW of electricity, respectively. Furthermore, the electrolyzer consumes 23.36 kW of electric power and 3.64 kW of cooling is produced by the chiller. In addition, the energy efficiency and total exergy destruction of the proposed system are 71.32 % and 57.94 kW, respectively.

Comprehensive evaluation of concentrated solar collector and Organic Rankine cycle hybrid energy process with considering the effects of different heat transfer fluids

Solar energy based power generation systems can reduce pollutants emissions by reducing fossil fuel consumption. A new option for this idea is the Organic Rankine cycle coupled with a concentrating solar collector. The present study provides the Organic Rankine cycle performance using energy, exergy and economic approaches, selecting the appropriate operating fluid for the cycle consisting of Organic Rankine cycle and Linear Fresnel solar reflector. The effect of different organic fluid as well as different nanofluids on the overall performance of the cycle is investigated. Sensitivity analysis is discussed to evaluate the effect of various factors such as solar radiation, inlet temperature of solar system, mass flow rate, and inlet temperature and pressure of turbine on energy system performance. It was found that, the results provided in the present study do not correspond to any of the findings of previous similar studies. In addition, about 170 collectors of Linear Fresnel reflectors are needed to supply the thermal power required by the Organic Rankine cycle system. Under design conditions, the Levelized Cost of Energy and Simple payback time for the proposed hybrid system are obtained 0.0446 Euro/kWh and 7.74 years, respectively. Furthermore, the investment cost of the Linear Fresnel reflector system plays a key role in the economic justification of the proposed hybrid energy system.

PERFORMANCE ANALYSIS OF A SOLAR-DRIVEN EJECTOR AIR CONDITIONING SYSTEM UNDER EL-OUED CLIMATIC CONDITIONS, ALGERIA

In order to understand the behavior and to determine the effective operational parameters of a solar-driven ejector air conditioning system at low or medium temperature, a dynamic model depends on the principles of conservation, the momentum mass and energy is developed. For this purpose, the thermodynamic characteristics of the liquid and vapor refrigerant were identified using the Engineering Equation Solver (EES) software. Linear Fresnel solar reflector has been used as a tool to convert solar energy into thermal energy. Water (R718) was used as a refrigerant. The operational conditions for the studied solar-driven ejector air conditioning system are as follows: evaporator temperature “Te =283.15 K”, condenser temperature “Tc =305.15 K”, and generator temperature “Tg = 373.15 K”. The performance of the ejector air conditioning system was compared as a function of the operating parameters of the subsystem. The average value of thermal efficiency of the Fresnel linear concentrator has reached 31.60 %, the drive ratio “ω” is 0.4934, the performance value of the ejector air conditioning subsystem “COPejc” is 60.664 % and the average value of the thermal performance of the machine “STR” has touched 19.17 %. The results obtained through this scientific subject are stimulating and encouraging, where this technique can be used for air conditioning in desert areas in southern Algeria, where fossil energy (petroleum, gas, etc.) is extracted and produced in various types.

Energy, exergy, environmental and economic comparison of various solar thermal systems using water and Thermia Oil B base fluids, and CuO and Al2O3 nanofluids

Recently, the use of solar thermal collectors has increased significantly. In the present work, energy, exergy, enviroeconomic and exergoeconomic analyses of various solar thermal collectors are investigated. These solar thermal collectors include flat-plate solar collector, linear Fresnel solar reflector, parabolic trough solar collector and solar parabolic dish collector. To examine the performance of these solar collectors two different working fluids, i.e. water and Thermia Oil B are considered. Furthermore, evaluation of the performance of solar collectors using nanofluids consisting of Al2O3 and CuO nanoparticles is presented. Also, in this paper, parameters such as exergy destruction rate, entropy generation rate, Sustainability index and Levelized Cost of Electricity for solar collectors are discussed. The performance of solar collectors in two different cities located in Iran (Tehran and Tabriz) is discussed for two different days (a winter day (2-Feb) and a summer day (14-Jun)). MATLAB software is used for mathematical modeling of solar thermal collectors. The results revealed that, the best and weakest performance from energy and energy points of view in all cases are related to the dish collector and flat-plate collector, respectively. Furthermore, the obtained results of the use of nanofluids as well as economic analysis may present new insights to the operation and development of such solar thermal systems.

Evaluating energy efficiency and economic effect of heat transfer in copper tube for small solar linear Fresnel reflector

An experimental and numerical investigation of a small linear Fresnel for water heating application has been carried out in Blida, Algeria. The numerical simulation with a 1D modeling in transient mode was performed by using the finite difference method. The thermal evaluation is based on the energy assessments characterized by the differential equations of pure water with a flow mass rate equal to 0.015 kg s−1 and copper absorber tube temperature. Moreover, the Fluent code has been developed in order to conduct the CFD modeling at the absorber tube of the solar collector. SolTrace software has been used to determine the optical behavior of the linear reflector. The average optical efficiency of the device is about 42.97%, but the average value of the experimental thermal efficiency reached 29.21% for 22/01/2015 and 29.20% for 19/02/2015. The average value of pure water temperature for 22/01/2015 is 67.28 °C, while its value for 19/02/2015 is 70.99 °C. This solar experimental setup will reduce the consumption of liquefied natural gas by 88.9 m3, which will reduce the CO2 emission by 187.93 kg. In addition, its manufacturing cost will be recovered 16 years from the date of use of this heater.

Performance assessment of linear Fresnel solar reflector using MWCNTs/DW nanofluids

In this study industrial grade Multi-walled carbon nanotubes (MWCNTs) nanoparticles dispersed in distilled water (DW) are investigated to evaluate its impact on the thermal behavior of linear Fresnel solar reflector technology. The stability and thermophysical properties of the MWCNTs/DW nanofluids are obtained experimentally. Stable nanofluids that showed higher thermal conductivity compared to DW were obtained. Thermal conductivity (TC) of the nanofluids increased by 3%, 6% and 7% for the volume fractions of 0.05%, 0.1% and 0.3% at 25 °C, respectively. TC also increased with the increase in temperature (i.e. 11% for 0.3% volume fraction at 70 °C). A one-dimensional model is developed to evaluate the transient behavior of the nanofluid within the linear solar reflector. Matlab code based on the finite difference method is developed to solve the energy balance equations at the different components of the studied solar collector. The numerical model is then validated with experimental results, where a maximum experimental thermal efficiency of 29.205% at 14:00 is achieved. MWCNTs/DW nanofluid with 0.3% volume fraction has the highest thermal efficiency of 33.81% and the highest PEC value as well as the lowest entropy generation.

Introducing and investigation of a combined molten carbonate fuel cell, thermoelectric generator, linear fresnel solar reflector and power turbine combined heating and power process

Abstract In the present study, a combined heat and power process consists of molten carbonate fuel cell, thermoelectric generator, linear Fresnel solar reflector and power turbine is introduced and investigated from energy, exergy and thermodynamic points of view. Fuel cell produces electrical and thermal power. A part of waste heat from the fuel cell is sent to the thermoelectric generator to produce additional power and the remaining enters the environment. The solar field as a heat exchanger generates a part of the required thermal power of the proposed process. Linear Fresnel solar reflector with duty of 1728 kW is used too. Numerical modeling and thermodynamic analysis of the proposed system is done using MATLAB and HYSYS softwares, respectively. The results were discussed in two scenarios: (1) investigation of fuel cell and thermoelectric generator hybrid system and (2) investigation of whole combined heat and power process. Results indicate that the overall and electrical efficiencies of the proposed system are 64.93% and 31.57%, respectively. Also, in this process, 41728.8 kW of exergy is destroyed and the process total exergy efficiency is gained 0.12%. Finally sensitivity analysis of the fuel cell, turbines, solar system and thermoelectric generator against effective parameters is investigated.

A numerical simulation of a linear Fresnel solar reflector directed to produce steam for the power plant

The concentrating solar systems of linear Fresnel reflectors offer the ability to generate electricity from solar energy. The main objective of this paper is to perform a transient numerical simulation on a linear Fresnel solar reflector directed to produce superheated water steam for the power plants, in order to determine its efficiencies (optical and thermal), where the heat transfer fluid mass flow inside the copper absorber tube is 0.045 kg/s. The dimensions of the studied linear Fresnel solar collector are the same dimension as the modular system Nova-1 of NOVATEC SOLAR Company. The dimension of the studied model is 1D. For this purpose, El-Oued region has been designated as a study field. The twelve recommended average days for months have been selected for the study. This paper was based on a numerical solution using the finite differences method. MATLAB has been used as a software language. The optical efficiency of the LFR solar receiver has reached 53.7% where the thermal efficiency has reached 37.5%, while the pressure drop within the absorber pipe has reached 02 bars. As for superheated steam temperatures variations, it ranged between 233.35 °C and 263.75 °C, knowing that the water steam inlet temperature when entering the absorber tube is equal to 140 °C. As for the overall coefficient of heat loss, its mean value is 5.84 W/m2.°C. The results obtained are very encouraging to invest in this steam power plant, especially in the desert areas, which are rich in solar energy.

Direct utilization of solar linear Fresnel reflector on multi-effect eccentric horizontal tubular still with falling film

The paper presents a multi-eccentric tubular desalination system heated directly by a linear Fresnel reflector (LFR) field to enhance the productivity. In this novel system, the solar radiation is sent directly into desalination unit. The configuration and working processes of the proposed design are described in details. The tube inner wall with absorbing coating were used as a receiver by placing in the cylindrical cavity to absorb concentrated solar energy and transfer it to a falling water film. To verify the performance of the system in different effects, an indoor experimental eccentric tubular still was fabricated and tested under different heating conditions from 400 to 1600 W respectively. The experimental results showed that the maximum accumulated yield of the 1st and 2nd effect are about 28.27 kg and 21.37 kg, respectively. The outdoor experimental results show that the cumulative output of the unit is about 11.35 kg, the maximum performance ratio (PR) is about 2.88 with an evacuated tube solar collector. A two-effect tubular desalination system for linear Fresnel reflector with a capacity of 63.68 kg/d was proposed according to the presented theoretical and experimental work. By taking solar linear Fresnel reflector heating mode, the cost of water production reaching about $6.16/ton.

Assessment of linear solar concentrating technologies for Greek climate

The objective of this work is to compare and to evaluate the performance parabolic trough solar collector (PTC) and the linear Fresnel solar reflector (LFR) for the climate conditions of Athens, Greece. These collectors are examined under the same operating conditions and they are evaluated energetically, exergetically and financially. The analysis is conducted for all the year period using twelve typical days, one for every month. Performance curves for the solar systems are taken from the literature in order to estimate the collector performance for different operating temperature levels, solar irradiation level and solar angles. According to the final results, the mean yearly incident angle modifier for the PTC is about 83.73%, while for the LFR is 58.66%, at the examined climate conditions. It has been found that the mean yearly thermal efficiency at 350 °C is 52.25% for the PTC and 35.39% for the LFR, while the mean yearly electrical efficiency of the equivalent power production system is 16.11% with the PTC and 10.92% with the LFR. The simple payback period for process heat production was found close to 3–4 years, while for power production close to 8–9 years. Moreover, it is proved that the specific cost of the LFR has to be lower than 185 €/m2 in order to be a more attractive choice financially compared to the PTC.

Estimation of heat losses due to wind effects from linear parabolic secondary reflector –receiver of solar LFR module

A numerical study is carried out to determine the heat losses caused by natural and forced convection as well as radiation from the parabolic secondary receiver of a Solar Linear Fresnel Reflector system. The geometric configuration considered corresponds to an absorber tube placed in an open aperture. Thermal performance of the receiver with the acceptance angle θa= 45°, truncation point H/W = 0.6, focal position of the absorber f= 7.9 m and gap between the secondary reflector and absorber tube (G) to the height of the secondary reflector (H) at G/H = 0.14 are considered for the thermal analysis. Thermal losses from the reflector over a wide range of temperature(373K−773K), diameter ratio (0.14−0.27) and emissivity (0.01−1) are analysed. Realistic conditions including the effects of wind and commerically available absorber diameter and emissivity values are considered to assess the performance of the receiver. Investigation is carried out to determine the heat losses at wind velocities up to 10 m/s. Nusselt number correlations are proposed for determining the heat losses from a solar cavity open aperture with CPC profile. The proposed correlations are functions of the temperature ratio(Th/T∞) , diameter ratio, emissivity, Grashof number and Reynolds number and they are very useful for predicting the heat losses from the linear receiver of a typical solar LFR system.

Multi-criteria evaluation of a nanofluid-based linear Fresnel solar collector

Solar linear Fresnel reflector (LFR) is a promising concentrating technology, which presents important advantages such as the low investment cost, the reduced wind loads and the relatively low land utilization factor. The objective of this work is to investigate an innovative way for enhancing the thermal performance of LFR, especially at high temperatures. The utilization of nanofluid as heat transfer fluid is the investigated thermal enhancement method and more specifically the use of CuO nanoparticle dispersed on Syltherm 800 (6% volumetric concentration). The examined collector has total net aperture equal to 154 m2 and concentration ratio of 58.36. The primary reflectors are curved mirrors, the secondary reflectors have compound parabolic shape and the receiver is an evacuated tube. The operation with nanofluid is compared to the operation with pure thermal oil for various inlet temperatures from 350 K up to 650 K and flow rate equal to 200 L/min. According to the final results, the maximum thermal efficiency enhancement with the nanofluid is close to 0.8%, while the pumping work demand is increased up to 50% with the nanofluid. Various criteria like the exergy efficiency, overall efficiency and entropy generation are applied in order to evaluate the nanofluid utilization properly. Finally, the operation with nanofluid is found to be beneficial, especially in high-temperature levels. The analysis is conducted with SolidWorks Flow Simulation with a validated model.

Performance investigation of linear evacuated absorber of 2-stage solar Linear Fresnel Reflector module under non-uniform flux distribution

Performance and heat loss analyses have been carried out for a 2-stage parabolic receiver system of the solar Linear Fresnel Reflector module. Performance of the system with non-uniform distribution of the flux on the absorber and the influence of the wind on the receiver system are investigated. Solar flux distribution on the surface the absorber is applied by user-defined function to analyse the heat loss under the real-time scenario. The performance of the absorber tube when coated or uncoated with a selective material is studied for different flux conditions. This provides a perception to adopt appropriate coating material for different locations under varied DNI conditions. The investigation has been carried out to analyse the heat loss effects when the absorber is placed under evacuated and non-evacuated conditions. All the modes of heat transfer are considered in the study and the dominance of each mode of heat transfer is highlighted. Performance of the numerical data with the non-uniform flux distribution on the absorber with the measured velocity and emissivity values are validated with the experimental data. Deviation of ±10 % is observed between the experimental and the numerical values.

Heat loss investigation of 125kWth solar LFR pilot plant with parabolic secondary evacuated receiver for performance improvement

Numerical investigation is carried out on the secondary reflector system of the pilot solar linear Fresnel reflector module of 154 m2 in Vallipuram, Tamil Nadu. Initially, optical investigation on the design of the Linear Fresnel Collector module and the secondary reflector system is carried out. The optimized flux thus obtained is applied as a boundary condition to the thermal loss analysis. Investigation of the total heat losses (convective, radiative and conductive) with three different boundary conditions namely, the constant flux, variable flux and non-uniform flux distribution is carried out. The heat loss study has been carried out when the absorber is under non-evacuated and evacuated state. The study has been carried out with the DNI ranging between 250 W/m2 and 1000 W/m2. Uncoated and selectively coated absorbers with the emissivity of 0.01–1 are analyzed. Comprehensive analysis on the influence of wind flow on the receiver system is carried out. The variation of wind velocity from the ground level is incorporated in the forced convection. Investigation on the effect of the wind speed (0 m/s–10 m/s) and the wind direction (0°–90°) on this second stage reflector system is analyzed. The deviation between the different flux boundary conditions is comprehensively analyzed under different DNI and wind conditions. The variable flux distribution shows less deviation of about 15% from the non-uniform flux distribution for the DNI of 1000 W/m2 and is found to be less than 5% for 500 W/m2 under evacuated conditions. To avoid the computational complications in applying non-uniform flux boundary conditions to the absorber for DNI greater than 500 W/m2, variable boundary flux condition can be applied as an equivalent flux condition by augmenting 15% non-uniform error percentage to the final heat loss value.

Aiming strategy optimization for uniform flux distribution in the receiver of a linear Fresnel solar reflector using a multi-objective genetic algorithm

Non-uniform solar flux may lead to negative effects in the receiver of the linear Fresnel reflector (LFR), including the failure of the receiver and the fluctuating operation. For reducing these effects, an aiming strategy optimization approach is presented by combining a multi-objective Genetic Algorithm (GA) and Monte Carlo ray tracing to homogenize the flux distribution in current work. Both the flux non-uniformity index and the optical loss (ηloss) are used as the objective functions. Based on the approach, first, the flux distributions in the Multi-Tube Cavity Receiver (MTCR) and the Single-Tube Receiver with a Secondary Collector (STRSC) are optimized at a typical condition. Optimal results indicate that the GA optimization strategy (S2) can reach a compromise between the flux non-uniformity and the optical loss in both MTCR and STRSC systems. Furthermore, the optimal strategy obtained at a specific transversal incidence angle can be applied in a relatively large range around it. Moreover, parameter study indicates that the aiming line number (naim) has little impact on the efficiencies of the two systems. naim has almost no effect on the flux non-uniformity in the MTCR, but the effect is visible in the STRSC. Finally, the application of S2 under a real-time condition indicates that fluxes in the two receivers can be homogenized efficaciously in the whole time range with a small drop of 0.2–3.8 percentage points in efficiency compared with those of traditional one-line aiming strategy (S1). It is also found that the flux non-uniformity indexes of the MTCR are greatly reduced from 0.77–1.09 to 0.02–0.06 when S1 is replaced by S2, and those of the STRSC are steeply reduced from 0.59–0.70 to 0.29–0.37. It is concluded that the present approach is effective and suitable for homogenizing the fluxes in the receivers of LFRs.

Optimization of solar linear Fresnel reflector system with secondary concentrator for uniform flux distribution over absorber tube

Solar linear Fresnel reflectors (LFR) are attractive because of low cost and optimal utilization of land area. They provide high concentration ratio when used in conjunction with secondary concentrators. A pilot plant of LFR system with 154m2 of primary mirror field installed at Vallipuram, India has been considered for the present analysis. This type of collectors give rise to high variation of solar radiation flux in the circumferential direction of absorber for the cases with fixed aim line of primary mirrors. In the present work, the concept of variable aim lines for primary mirrors is introduced to defocus and spread the radiation flux in a more uniform manner over the absorber. In particular, both the tilt angles and the radii of curvature of the individual Fresnel mirrors are modified to obtain a better flux uniformity. In addition, a novel segmented parabolic secondary concentrator profile has also been developed, which in conjunction with the variable aim line concept leads to a high optical efficiency of 76.4% and a coefficient of flux variation value of 0.13. On the other hand, 74.9% and 70.9% of optical efficiencies along with 0.17 and 0.33 values of coefficient of variation are obtained with more commonly employed compound parabolic concentrator and trapezoidal concentrator profiles respectively.

Numerical analysis of convective and radiative heat losses from trapezoidal cavity receiver in LFR systems

Solar linear Fresnel reflector (LFR) system is a simple and cost effective technology for heat generation for medium temperature (<400°C) applications. The system consists of a trapezoidal cavity receiver enclosing the flux absorbing surface. This study is aimed at understanding the coupled convective and radiative heat loss from the trapezoidal cavity receiver. The top wall of the cavity is isothermal, bottom wall is losing heat by convection and others two inclined vertical walls are insulated. Although several studies in heat transfer from such cavities are available, these have been limited emphasis on development of non-dimensional correlations. The development of correlations is important as it leads to wider applicability of the results for design of such cavities. A few correlations developed earlier for such cavities either do not consider all the parameters or have some limitations. In the present work a comprehensive correlation is developed with Grashof number, aspect ratio, geometrical parameter (cavity angle and aspect ratio), radiation-conduction number and external Nusselt number. Special emphasis is given on choosing the correct form of these correlations.

Optical modelling and performance analysis of a solar LFR receiver system with parabolic and involute secondary reflectors

In this paper, a pilot scale solar Linear Fresnel Reflector of 154m2 is designed and optically analyzed with two different profiles for the secondary concentrator. Compounded profiles of parabolic (PB) and involute (IN) shapes are compared for the secondary reflector geometry. Non-uniform intensity distribution of the solar disc with the flux transmission by the Monte Carlo Ray tracing method is used. Analyses are carried out with a 3D optical model and the combined optical performance of the Linear Fresnel Reflector (LFR) system with the parabolic secondary reflector is compared with that of the involute secondary reflector. The effects of truncating the secondary reflectors, optimizing the focusing distance of the absorber and the gap between the absorber and the secondary reflector, are investigated. Also the effects of errors caused by sun-tracking and contour of the mirror surface are studied. The efficiency of the Linear Fresnel Reflector system with the two models of secondary concentrators at different incidence angles of the solar beam are evaluated with Incidence Angle Modifier. Optical performance at different Direct Normal Irradiance (DNI) conditions is also performed. It is found that the Linear Fresnel Reflector system with Parabolic secondary reflector provides a higher optical efficiency of 62.3% with secondary efficiency of 83.3%. The Involute secondary on the other hand, provides an optical efficiency of 59.5% and secondary efficiency of 78.33%.