Tilt and Orientation of a Flat Solar Collector to Capture Optimal Solar Irradiation in Chilean Latitudes

2018 ◽  
pp. 215-228
Author(s):  
Lisdelys González-Rodríguez ◽  
Laura Pérez ◽  
Adelqui Fissore ◽  
Lien Rodríguez-López ◽  
Jorge Jimenez
Keyword(s):  
Solar Collector ◽  
Solar Irradiation

scholarly journals Effect of Color Coating of Cover Plate on Thermal Behavior of Flat Plate Solar Collector

Energies ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 6696
Author(s):  
Chengyi Li ◽  
Qunwu Huang ◽  
Yiping Wang
Keyword(s):  
Thermal Behavior ◽  
Solar Collector ◽  
Solar Irradiation ◽  
Cover Plate ◽  
Brick Wall ◽  
Absorber Plate ◽  
Plate Temperature ◽  
Glass Cover ◽  
Color Coating ◽  
The One

An important trend of Building Integrated Solar Thermal (BIST) system is to improve the aesthetic aspect of the solar collector to meet the requirement of architectural style and energy collection. Painting on the glass cover in an appropriate method is a simple and practical way. In this study, a halftone coating was used to print a red brick wall pattern on the glass cover. A series of comparative experiments were carried out to test the effect of the coating on the thermal behavior of the solar collector. In heat collection processes, compared with the solar collector with blank cover plate, the one with coated cover plate has lower absorber plate temperature and higher cover plate temperature. The lower the solar irradiance, the smaller the effect of color coating on the solar collector. Compared with the uncoated surface, the coated surface is more sensitive to solar irradiation. In the same heat collection process, compared with the solar collector coated on the outer surface of the cover plate, the one coated on the inner surface has 0.8 °C higher heat absorber plate temperature and 5% lower top heat loss.

Experimental Field Study of Green Tower Setup

2015 ◽  
Vol 1113 ◽  
pp. 782-788
Author(s):  
Zainoor Hailmee Solihin ◽  
Wirachman Wisnoe
Keyword(s):  
Temperature Distribution ◽  
Field Study ◽  
Solar Collector ◽  
Convective Flow ◽  
Thermal Power ◽  
Practical Experience ◽  
Solar Irradiation ◽  
Solar Thermal Power ◽  
Experimental Field ◽  
Solar Air Collector

A Green Tower for setup a pilot experiment consists of the solar collector and the tower was built. The temperature distribution of the Green Tower was measured and analyzed. The data of the highest experimental temperature inside the Green Tower collector’s reached was 52oC at 1300 hours at solar irradiation received of 623W/m2 respectively, with the ambient temperature at 31 oC. The Green Tower that used solar thermal power and utilizing a combination of solar air collector using the principal of solar oven and central updraft tube to generate a solar induced convective flow, which drives pressure to develop artificial wind. This paper presents the experimental field study and practical experience of the Green Tower. The discussion on temperature distribution and also updraft wind of the Green Tower is described and then the results from the designing, building and experimental are presented. The results and suggestions for the future reference will also be discussed.

On the Weathering of Thin Plastic Films

1983 ◽  
Vol 105 (2) ◽  
pp. 149-156 ◽  
Author(s):  
H. Cheng ◽  
R. B. Bannerot
Keyword(s):  
Thermal Effects ◽  
Solar Collector ◽  
Solar Irradiation ◽  
Plastic Film ◽  
Degradation Mechanisms ◽  
Plastic Films ◽  
Mechanical Effects ◽  
Thin Plastic

A program is described for the controlled degradation and evaluation of thin plastic film samples in a set of parallel (in time) exposures. The intent of the various exposures is to separate the effects of identifiable degradation mechanisms associated with each material’s use as a solar collector cover. The mechanisms considered were those due to: (i) environment less solar irradiation (chemical, abrasion, humidity, etc.); (ii) environment including solar irradiation; (iii) thermal effects and (iv) mechanical effects. The procedures described in the program are illustrated by presenting the details for the evaluation of two commonly used plastic films.

Investigation of Vegetable Oil as Thermal Fluid in Parabolic Solar Collector

2008 ◽  
Author(s):  
M. M. Khan ◽  
M. R. Islam
Keyword(s):  
Vegetable Oil ◽  
Canola Oil ◽  
Solar Collector ◽  
Experimental Studies ◽  
Absorption Efficiency ◽  
Modern Technology ◽  
Solar Irradiation ◽  
Renewable Sources ◽  
Waste Vegetable Oil ◽  
Thermal Oil

Because of limited sources of fossil fuel, renewable sources of energy are now getting concentration to meet up the huge demand of energy of modern technology. Among the renewable sources, solar energy source is considered to be the most important source because of its unlimited supply and numerous ecologically benign features. However, due to its diluted nature, it is required to concentrate this energy for fruitful utilization. Parabolic solar trough is one of the solar concentrators, for which a thermal fluid is used to absorb the solar radiation. However, most of the thermal fluids that are commonly used are synthetic and toxic in nature. In the frame of the sustainable development principles, it is necessary to establish a set of safe and non-toxic thermal oil for using in a solar collector. In this paper, both clean Canola oil and waste vegetable oil have been used as thermal oil to find out their performance. Experimental studies show a solar absorption efficiency of 77.8% and 37.67% with clean Canola oil and waste vegetable oil, respectively, can be achieved even at low solar irradiation conditions. All design criteria are investigated and reported in this paper.

scholarly journals Realization of a Based Concrete Thermal Storage Module used with a Medium Temperature Parabolic Trough Solar Collector

2015 ◽  
Vol 10 (1) ◽  
Keyword(s):  
Solar Energy ◽  
Solar Collector ◽  
Thermal Characteristic ◽  
Operation Time ◽  
Thermal Storage ◽  
Solar Irradiation ◽  
Parabolic Trough ◽  
Night Time ◽  
Medium Temperature ◽  
Parabolic Trough Solar Collector

Thermal solar energy has been considered for years as one of the most promising candidate for the substitution of the conventional systems providing a clean and sustainable energy solution. However, the intermittent aspect of the solar irradiation received by the earth surface presented a major obstacle for the exploitation and the integration of such technology in various applications. In order to avoid this barrier a thermal storage system for solar energy became a necessity especially for the concentrated solar power technologies. This paper shows the work carried out to determine the thermal behavior of a concrete storage unit for medium temperature applications. The experimental thermal storage module using concrete was realized and tested in order to be integrated in an advanced setup to a solar cooling installation powered by a parabolic trough solar collector. The thermal characteristic of the used concrete matrix was determined. The thermal storage module was tested under the same thermal conditions provided by the solar collectors. The temperature variations of the module during the charging and the heat loss during the night time were investigated. The test results showed some interesting thermal inertia of the concrete based storage module. The integration of the proposed storage module to the solar loop of the cooling installation will lead to extend the operation time after sunset and to decrease time lasted by the solar parabolic trough collector to reach the required operational temperature in the morning.

scholarly journals Teknologi Kolektor Surya Berlubang tanpa Kaca Transparan untuk Mengeringkan Daun Gaharu

2018 ◽  
Vol 38 (2) ◽  
pp. 227
Author(s):  
Irwin Bizzy ◽  
Budi Santoso ◽  
Muhammad Zahri Kadir
Keyword(s):  
Wind Tunnel ◽  
Moisture Content ◽  
Solar Collector ◽  
Input Parameter ◽  
Agricultural Products ◽  
Solar Irradiation ◽  
Efficiency Evaluation ◽  
Collector Plate ◽  
Engineering Department ◽  
Simple Technology

The perforated solar collector technology is a highly potential solution to take advantage of renewable energy in tropical countries such as Indonesia. This technology can be applied as a simple technology for drying of agricultural products. This study aims to determine the rate of the decreased moisture content of gaharu leafs. In this study, the perforated solar collector equipped with four ribs was used. The efficiency evaluation of perforated solar collector plate was conducted in Wind Tunnel-Rig, Basic phenomenon Laboratory of Mechanical Engineering Department, Sriwijaya University. The dimension of the plate is 850 mm × 300 mm × 1.5 mm, which has 1018 holes with 2.5 mm in diameter. The results show that the drying rate for achieving the 10% moisture content of the gaharu leafs, can be reached in 2–3 days. This condition occurs when the weather is sunny, or not cloudy and rainy. In other condition, when the sunshine with an average solar irradiation on the surface is greater than or equal 500 W/m2. The efficiency tests of the perforated  aluminum plate solar collector using wind velocity as input parameter show that the blackened plate resulted in better performance (12,83%) than the colorless one in (6,36%). ABSTRAKTeknologi kolektor surya berlubang ini merupakan salah satu solusi untuk dapat memanfaatkan energi baru terbarukan yang peluangnya sangat besar untuk dikembangkan di negara beriklim tropis seperti negara Indonesia. Teknologi ini dapat digunakan sebagai teknologi tepat guna untuk mengeringkan produk-produk pertanian. Tujuan penelitian ini adalah untuk menentukan laju penurunan kadar air daun gaharu. Dalam pengujian pengeringan ini digunakan kolektor surya berlubang bersayap empat. Evaluasi efisiensi pelat kolektor surya berlubang dilakukan di Wind Tunnel Laboratorium Fenomena Dasar, Jurusan Teknik Mesin, Universitas Sriwijaya. Dimensi dari pelat kolektor surya berlubang adalah 850 mm x 300 mm x 1,5 mm, dengan jumlah lubang 1.018 buah yang berdiameter 2,5 mm. Hasil penelitian menunjukkan bahwa laju pengeringan daun gaharu untuk mencapai kadar air 10 % dapat dihasilkan dalam 2 ¸ 3 hari.  Kondisi ini terjadi bila cuaca cerah, tidak hujan dan tidak berawan. Dalam kondisi lain, ketika matahari bersinar dengan radiasi matahari rata-rata yang mencapai permukaan lebih besar atau sama dengan 500 W/m2. Pengujian efisiensi kolektor surya pelat alumunium berlubang dengan parameter kecepatan udara, menunjukkan bahwa pelat berwarna hitam menghasilkan performansi yang lebih baik (12,83%) dibandingkan dengan pelat tanpa warna (6,36%).

Study of Characteristic of Evacuated Flat Plate Type Solar Collector With Flow Boiling

2007 ◽  
Author(s):  
Masahiro Taniguchi ◽  
Shigeki Hirasawa ◽  
Shunsaku Nakauchi ◽  
Tadayoshi Tanaka
Keyword(s):  
Flat Plate ◽  
Solar Collector ◽  
Flow Boiling ◽  
Saturation Temperature ◽  
Solar Irradiation ◽  
Working Fluid ◽  
Collector Plate ◽  
Collector System ◽  
Heat Collector ◽  
Collector Efficiency

An evacuated solar collector system with flow boiling in tube has high collector efficiency of solar energy. In this paper, we present experimental and simulation results for characterizing an evacuated flat plate solar collector. By comparing the experiment results with six boiling heat transfer correlation equations, we found that Sani’s correlation is closest to our experimental results. Subsequently, this paper reports on how various factors impact collector efficiency. Collector efficiency decreases with decreasing flow rate of the working fluid, with decreasing solar irradiation, with reduction of thickness and thermal conductivity of the heat collector plate. Collector efficiency increases with decreasing saturation temperature of the working fluid, with decreasing vacuum pressure in the collector, with small bending angle of the heat collector tube. Collector efficiency does not change with change of inside diameter of the heat collection tube, and with change of inlet subcooling temperature of the working fluid.

scholarly journals Parametric assessment of a building active façade by means of a combined metallic sandwich panel with an unglazed solar collector

2019 ◽  
Vol 282 ◽  
pp. 02046
Author(s):  
Peru Elguezabal ◽  
Alex Lopez ◽  
Jesús María Blanco ◽  
José Antonio Chica
Keyword(s):  
Solar Collector ◽  
Fossil Fuels ◽  
Meteorological Parameters ◽  
Poor Performance ◽  
Solar Thermal ◽  
Solar Irradiation ◽  
Inlet Temperature ◽  
Solar Thermal Energy ◽  
Use Stage ◽  
Thermal Difference

The building sector has a poor performance in terms of energy efficiency and is looking for alternatives to reduce the use of fossil fuels on building use stage. Renewables are unlimited and solar thermal energy is a technology with a demonstrated potential. The façade is a key element able to harness renewable energy coming from the sun becoming in an Active Solar Thermal Façade (ASTF). The main purpose of this study is the development of a parametric study using a numerical model to analyze the behavior of an unglazed solar collector. Thus, evaluating different design and meteorological parameters to show their influence on the heat transfer and the efficiency. The study shows that solar irradiation and mass flow are the most influential on thermal difference. However, for the efficiency ambient temperature and inlet temperature both are the most influencing ones. In brief, a set of parameters have a significant influence on the behavior of the ASTF that are fully governed by environmental conditions. Nevertheless, there are some other parameters that can be controlled during the operation. The challenge is to make a continuous configuration of this adaptable values depending on the external situation to achieve a higher performance for the ASTF.

scholarly journals Mathematical Modeling of Dual Intake Transparent Transpired Solar Collector

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Thomas Semenou ◽  
Daniel R. Rousse ◽  
Brice Le Lostec ◽  
Hervé F. Nouanegue ◽  
Pierre-Luc Paradis
Keyword(s):  
Mathematical Modeling ◽  
Solar Collector ◽  
Thermal Model ◽  
Heat Recovery ◽  
Significant Rise ◽  
Operating Conditions ◽  
Solar Irradiation ◽  
Combined Model ◽  
Air Mass ◽  
Collector Efficiency

Nowadays, in several types of commercial or institutional buildings, a significant rise of transpired solar collectors used to preheat the fresh air of the building can be observed. Nevertheless, when the air mass flow rate is low, the collector efficiency collapses and a large amount of energy remains unused. This paper presents a simple yet effective mathematical model of a transparent transpired solar collector (TTC) with dual intake in order to remove stagnation problems in the plenum and ensure a better thermal efficiency and more heat recovery. A thermal model and a pressure loss model were developed. Then, the combined model was validated with experimental data from the Solar Rating and Certification Corporation (SRCC). The results show that the collector efficiency can be up to 70% and even 80% regardless of operating conditions. The temperature gain is able to reach 20°K when the solar irradiation is high.

Impact of drying method of figs with small-scale flat-plate solar collector

2016 ◽  
Vol 13 (5) ◽  
pp. 407-412 ◽  
Author(s):  
Fahim Ullah ◽  
Min Kang ◽  
Lubna Hassan ◽  
Ninghui Li ◽  
Jun Yang ◽  
...  
Keyword(s):  
Moisture Content ◽  
Flat Plate ◽  
Solar Collector ◽  
Agricultural Products ◽  
Ficus Carica ◽  
Solar Irradiation ◽  
Small Scale ◽  
Content Type ◽  
Flat Plate Solar Collector ◽  
Drying Chamber

Purpose The purpose of the study was to develop a performance flat-plate solar collector that would be used as a solar drier for fruit fig (Ficus carica L). This study proposes how and why solar energy is important for drying the agricultural products. This study aims to expand the domain of solar collector for different purposes and, most important, for agricultural resource normally found in the literature. Design/methodology/approach The paper opted for an exploratory study using the flat-plate solar collector with drying chamber for drying purposes of agricultural products. During the experiment, the data were collected with moisture content, drying rate of the product and solar irradiation falls on the collector. Findings This paper describes that how flat-plate collector works for agricultural products and how to reduce the moisture content in the product (fig). Efficiency of collector was evaluated under the ambient temperatures of 24°C. Efficiency also significantly increased from 53 to 55 per cent with an increase in ambient temperature from 22 to 24 °C. Figs (Ficus carica L) were dried in the drying chamber of the flat-plate solar collector. The products were dried at temperature of 55-65°C and 15 to 20 per cent humidity. Research limitations/implications Because of this research chosen, the research results are beneficiary for agricultural users for drying purposes. Therefore, the researchers are encouraged to dry the agricultural product with flat-plate solar collector, because it reduced the moisture content of the product very fast. Originality/value This paper fulfills an identified need to study that how flat-plat solar collector can be used.

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