RANCANG BANGUN KOLEKTOR SURYA TIPE PARABOLIC TROUGH CONCENTRATOR SEBAGAI SUMBER ENERGI MESIN PENDINGIN MOBIL

Penelitian ini bertujuan untuk membuat prototipe AC alternatif mobil mengadopsi teknologi Solar Ice Maker (SIM) dengan kolektor surya tipe parabolic trough concentrator sebagai sumber energi panasnya. Teknologi SIM dapat digunakan sebagai alternatif pengganti teknologi Air Conditioner konvensional yang menggunakan listrik. Kolektor surya tipe parabolic trough concentrator digunakan sebagai kolektor radiasi surya untuk menyediakan sumber panas bagi mesin SIM. SIM akan menggunakan sumber panas sebagai energi utama mesin SIM guna menghasilkan suhu yang rendah sebagai pendingin ruangan mobil. Metode yang digunakan pada penelitian ini adalah studi pustaka dan eksperimental. Beberapa tahap yang akan dilakukan adalah perancangan dan pembangunan prototipe kolektor surya tipe parabolic through concentrator sesuai dengan parameter yang ditentukan pada tahap desain. Pengujian terhadap prototipe kolektor surya tipe parabolic trough concentrator dilakukan untuk mengetahui karakter Coffisien of Performance (COP) nya. Integrasi solar collector dengan mesin pendingin teknologi SIM dilakukan untuk mendapatkan efek pendinginan pada chiller SIM. Hasil yang diharapkan dari kegiatan ini adalah sebuah mesin pendingin alternatif bagi ruangan mobil tanpa menggunakan listrik (Aki) mobil sehingga dapat menghemat BBM. Hasil pengujian akan dianalisa dan dipublikasikan pada Prosiding Seminar Internasinal IEEE terindeks SCOPUS. Katakunci: Kolektor surya, Parabolic Trough Concentrator, Coffisien of Performance (COP), Solar Ice Maker (SIM)

Theoretical modeling of a new structure of III-V tandem solar cells by using parabolic trough concentrator

In this study, potential efficiency of GaInP/GaAs mechanically stacked two-junction solar cell is theoretically investigated by optimizing the thickness of GaAs and GaInPandusing a new optical model to separate the junction between the two solar cell in order to solve problems of tunnel junction and difficulties of fabrication. The principal of this new model is inspired from that of parabolic trough concentrator. Results show that the optimum conversion efficiency is 43 % under AM1.5 spectral illuminations. The obtained results from computation and Matlab simulation of three fundamental parameters which are Reflectance R, external quantum efficiency QE and current density J, would be helpful in designing and fabricating high efficiency GaInP/GaAs mechanically stacked solar cell in experiment.Keywords: GaInP/GaAs; parabolic trough concentrator; optical model; AM1, 5 illuminatio

Neural Network Inverse Modeling for Optimization

In this chapter, artificial neural networks (ANNs) inverse model is applied for estimating the thermal performance () in parabolic trough concentrator (PTC). A recurrent neural network architecture is trained using the Kalman Filter learning from experimental database obtained from PTCs operations. Rim angle (φr), inlet (Tin), outlet (Tout) fluid temperatures, ambient temperature (Ta), water flow (Fw), direct solar radiation (Gb) and the wind velocity (Vw) were used as main input variables within the neural network model in order to estimate the thermal performance with an excellent agreement (R2=0.999) between the experimental and simulated values. The optimal operation conditions of parabolic trough concentrator are established using artificial neural network inverse modeling. The results, using experimental data, showed that the recurrent neural network (RNN) is an excellent tool for modeling and optimization of PTCs

Engineering design and optical investigation of a concentrating collector: Case study of a parabolic trough concentrator

In this paper, an optical investigation study of a solar radiation collector has been treated through a precise model, which it has integrated all the geometrical characteristics of the concentrator to determine the optimal conditions of its operation. The type of solar collector chosen is the parabolic trough concentrator (PTC). This concentrator comprises a single mirror in the form of a half cylinder (cylindrical-parabolic) and a single receiver tube. A mathematical model has been introduced for the calculation the various optical factors, such as concentrator ratio “C”, intercept factor “γ” and incidence angle modifier factor “K (θ)”. The collector optical efficiency has exceeded 61 % with an external diameter of the receiver tube equal to 0.07 m, a focal distance equal to 3.76 m, a rim angle equal to 90° and a concentration ratio equal to 68.39.Keywords: solar energy; parabolic trough concentrator; optical factors; modeling

Performance Optimization of Solar Photovoltaic System using Parabolic Trough and Fresnel Mirror Solar Concentrator

An attempt has been taken to design parabolic trough and Fresnel mirror solar concentrator with the purpose of optimizing the output power of a photovoltaic system for both bright sunny day and cloudy day by using a 72-cell 5W photovoltaic solar panel. The PV system's efficiency has been analyzed in terms of output voltage, current, and power of the solar panel. Accordingly to our expectation, we observed that on a bright sunny day, the output power improvement of the solar panel is 26.81% for the parabolic trough and 17.89% for the Fresnel mirror concentrator. On a cloudy day, both concentrators improve output power by 22.3% and 14.1%, respectively. In terms of power optimization of a photovoltaic system, the following has been discerned: a solar photovoltaic concentrator system with a parabolic trough is much more effective than one with a Fresnel mirror

A STUDY OF AN OPTIMUM PARABOLIC TROUGH CONCENTRATOR DESIGN FOR POSSIBLE POWER GENERATION IN MALAYSIA

The aim of this research work is to design an optimum parabolic trough concentrator, where the optimum design parameters are identified by using simulation method. A new parabolic trough concentrator model was proposed. The new model, based on a standard model of a parabolic trough concentrator, has back copper tubes attached to the parabolic concentrator. The back copper tubes are expected to pick up the surplus heat on the iron concentrator due to incoming solar radiation that is not reflected. Simulations were carried out by using software programmed specifically for this research work and by using the outcomes from simulation, an experimental new model was fabricated based on optimum design parameters. The optimisers that were identified by simulations are the rim angle, concentration ratio, acceptance half-angle and receiver's absorber tube size. The optimum value for rim angle is 90° and concentration ratio is 10. The acceptance half-angles falls in the range between 1.55° and 1.72°, where the optimum diameter for the receiver's absorber tube range between 27 mm and 30 mm. A rim angle of 90° can be obtained when the parabolic depth becomes equal to the focus point. The receiver's absorber tube diameter size was 30 mm, where for the concentration ratio to be 10, the width was calculated as 1.0 m and depth and focus point was set at 0.25 m. The length of the concentrator at 1.83 m was determined by using the thermal module simulation and was also subjected to the budget availability. The simulation software was used to evaluate the performance of the new design with the optimum parameters by using the meteorological data for Bayan Lepas, Ipoh, XX Ill Cameron Highlands, Kuantan and Senai. The maximum instantaneous simulated outlet fluid temperature achieved is 133.8 °C for Ipoh. The maximum instantaneous experimental outlet temperature achieved on the 61 h July 2003 by using the prototype model was ( 143.8 ± 0.5 ) oc, at an average direct and diffuse solar insolation of 2.57 MJ/m2 and 0.81 MJ/m2 respectively, with a mass flowrate ofO.Ol kg/sand ambient temperature of ( 31.3 ± 0.5 ) °C. The performance of the model with and without the back tubes was compared where the difference between average values was (11.8 ± 4.0 )°C, which was approximately ( 14.0 ± 5.0) % increase in the outlet fluid temperature. The working fluid used in this research work is saturated water

Projection of distributed-collector solar-thermal electric power plant economics to years 1990-2000

A preliminary comparative evaluation of distributed-collector solar thermal power plants was undertaken by projecting power plant economics of selected systems to the 1990 to 2000 time frame. The selected systems include: (1) fixed orientation collectors with concentrating reflectors and vacuum tube absorbers, (2) one axis tracking linear concentrator including parabolic trough and variable slat designs, and (3) two axis tracking parabolic dish systems including concepts with small heat engine-electric generator assemblies at each focal point as well as approaches having steam generators at the focal point with pipeline collection to a central power conversion unit. Comparisons are presented primarily in terms of energy cost and capital cost over a wide range of operating load factors. Sensitvity of energy costs for a range of efficiency and cost of major subsystems/components is presented to delineate critical technological development needs

Performance evaluation of hybrid solar parabolic trough concentrator systems in Hong Kong

Author name used in this publication: Edward W. C. LoVersion of RecordPublishe

Simulation Of Heat Transfer Coefficient Due To Wind Blowing Across Cylindrical Receiver Of A Parabolic Trough Concentrator.

The evaluation of the heat transfer coefficient due to wind, hw over certain surfaces can be considered as tedious, if it is carried out in an environment where the temperature changes significantly. Reynolds, Prandtl and Nusselt numbers are used to compute the wind heat transfer coefficient. The parameters defining these numbers are dependent on the temperature