Study of a solar air flat plate collector: use of obstacles and application for the drying of grape

Abene, A.; Dubois, Véronique; Ray, M. Le; Ouagued, A

doi:10.1016/j.jfoodeng.2003.11.002

Cited by 91 publications

(33 citation statements)

References 3 publications

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“…Important of baffles in solar dryers system was also reported by Pona [25] in his research and recommended the installation of baffles raise the efficiency of the collector by 7% to 12% compared to ordinary collectors (collector without baffles). Similarly, Abene [26] assesses heat transfer in collector by inserting different types of air obstacles disposed of in rows across the plate of collector and reported positive improvement of the performance of the drying unit. Furthermore, [27] experimentally studied the impact of baffle space and baffle length in the performance of solar collector.…”

Section: Influence Of Baffles In Heat Transfermentioning

confidence: 99%

Heat Transfer Optimization in Air Flat Plate Solar Collectors Integrated with Baffles

Bakari¹

2018

JPEE

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This paper presents an experimental analysis for comparisons of conventional flat plate solar collectors and collectors integrated with different numbers of baffles. Heat transfer between absorber plate and drying fluid (air) has been one of the major challenges in the design and operations of the indirect solar dryer systems. In this experiment, efficiency of air flat plate solar collector integrated with 2, 3, 4 and 8 baffles was studied and compared with the ordinary collector. The results showed that integrating solar collector with baffles significantly increased the efficiency of the system. It was noted that collector with 2, 3, 4 and 8 baffles had a mean efficiency of 29.2%, 31.3%, 33.1% and 33.7% respectively while with no baffles was 28.9%. The analysis showed that when there were less than four baffles in the collector, heat transfer was dominant over pressure drop and hence high efficiency. However, when the number of baffles exceeded four, the effect associated with an increase in pressure drop highly observed compared to heat transfer coefficient, thus resulted to insignificant increase in efficiency. Therefore, the optimum number of four baffles was commended for the designed model for optimum efficiency.

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Section: Influence Of Baffles In Heat Transfermentioning

confidence: 99%

Heat Transfer Optimization in Air Flat Plate Solar Collectors Integrated with Baffles

Bakari¹

2018

JPEE

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“…Hal ini mendorong banyak peneliti berupaya untuk meningkatkan kinerja kolektor surya pemanas udara. Berbagai upaya yang telah dilakukan peneliti terdahulu adalah menggunakan plat penyerap yang dicat hitam atau diberi lapisan yang mempunyai absorptance tinggi dan emittance rendah [2], memasang honeycomb untuk mengurangi kalor yang hilang ke lingkungan [3], [4], [5], membuat aliran menjadi dua laluan [6], [7], [8], meningkatkan koefisien konveksi udara dengan plat penyerap dengan mempersempit saluran sehingga aliran menjadi turbulen [9], [10], menggunakan saluran dari plat bergelombang atau plat penyerap vcorrugated [11], [12], [13], [14], [15], [16], [17], dan membuat aliran lebih turbulen dengan menambahkan fin, baffle, atau obstacle [18], [19], [20], [21], [22], [23], [24].…”

Section: Pendahuluanunclassified

“…Dari penelitian dan pendekatan teoritis, Ho et al [8] menemukan bahwa perpindahan kalor meningkat dengan digunakannya baffle aliran dua laluan dengan recycle dan fin yang dipasang di atas dan di bawah plat penyerap. Abene et al [21] menggunakan obstacle pada kolektor surya pemanas udara plat datar untuk mengeringkan buah anggur. Obstacle meningkatkan perpindahan kalor ke udara di atas plat penyerap, menciptakan turbulensi dan mengurangi dead zone dalam kolektor.…”

Section: Pendahuluanunclassified

Studi Numerik Penambahan Obstacle Terhadap Kinerja Kolektor Surya Pemanas Udara dengan Plat Penyerap Jenis V-Corrugated

Handoyo

Ichsani

Prabowo

et al. 2013

jtm

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ABSTRAKKolektor surya pemanas udara dapat digunakan untuk menghasilkan udara panas dengan sumber energi yang terbarukan.Namun, perpindahan kalor dari plat penyerap ke udara sangat rendah. Beberapa peneliti melaporkan bahwa obstacle dapat meningkatkan perpindahan kalor dalam kolektor surya saluran plat datar dan peneliti lain menemukan bahwa kolektor surya dengan plat penyerap jenis v-corrugated memberikan perpindahan kalor yang lebih besar daripada saluran plat datar. Namun, belum ada penelitian yang menggabungkan keduanya. Dalam paper ini akan dibahas studi numerik dari penggabungan keduanya, yaitu penambahan obstacle terhadap kinerja kolektor surya pemanas udara dengan plat penyerap jenis vcorrugated. Studi diawali dengan pembuatan mesh, pemberian kondisi batas, pemberian data input, dan pemilihan model turbulen. Hasil studi numerik dibandingkan dengan hasil eksperimen untuk mengetahui keabsahannya.Suatu kolektor surya pemanas udara dibangun dengan skala laboratorium untuk keperluan eksperimen ini.Eksperimen dilakukan di dalam ruangan agar kondisi lingkungan dapat dijaga konstan.Dari eksperimen didapat bahwa udara mengalami kenaikan temperatur lebih tinggi dan penurunan tekanan lebih besar saat diberi obstacle. Untuk udara dengan kecepatan 6,5 m/s dan intensitas radiasi 430 W/m 2 , udara mengalami kenaikan dari 24,5 o C menjadi 37,2 o C jika tanpa obstacle dan dari 24,3 o C menjadi 40,5 o C jika diberi obstacle serta peningkatan penurunan tekanan dari 94 menjadi 265 Pa dengan penambahan obstacle. Model turbulen yang tepat untuk studi numerik ini adalah Shear Stress Transport (SST) k-.Dari studi numerik yang dilakukan, didapatkan bahwa aliran balik di antara obstacle dan celah sempit di antara obstacle dengan plat penyerap menyebabkan aliran lebih turbulen dan perpindahan kalor konveksi ke udara dari plat penyerap kolektor meningkat.Hasil studi numerik konsisten dengan hasil eksperimen. Kata kunci:Kolektor surya pemanas udara, obstacle, plat penyerap v-corrugated, studi numerik. ABSTRACT An air solar collector as a renewable energy source is used to provide hot air. Unfortunately, heat transferred from the absorber plate to the flowing air is very low. Some research reported that obstacles can improve heat transfer in a flat

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“…Tel örgü yapısı ile ısıl verimin konvansiyonel yapıdaki düz absorber plakalı güneş kollektörlerine kıyasla önemli bir ölçüde arttığını gözlemle-mişlerdir [7]. Çalışmalarda, hava akışına türbülans etkisi verecek engellerin absorber plaka üzerine yerleştirilmesi yoluyla da ısıl verimde önemli artışlar sağlandığı belirtilmiştir [8][9][10]. Esen, güneş enerjili hava kollektöründe absorber plakanın her iki yüzeyine de farklı şekillerdeki engelleri yerleştirerek enerji ve ekserji analizi yapmıştır.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Yutucu Plaka Üzerine Konik Yayların Yerleştirildiği Güneş Enerjili Hava Kollektörünün Bulanık Mantık ile Modellenmesi

Abuşka¹,

Akgül²,

Altıntaş³

2017

Journal of Polytechnic

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Politeknik Dergisi, 2017; 20 (4) : 907-914 Journal of Polytechnic, 2017; 20 (4) ÖZGüneş enerjili hava kollektörleri (GEHK) genellikle mahal ısıtma ve tarımsal ürünlerin kurutulmasında kullanılmaktadır. GEHK'nde yutucu plaka ve akışkan arasındaki ısı transferinin düşük olmasından dolayı ısıl verimleri düşüktür. Bu çalışmada ısıl verimin yükseltilmesine yönelik olarak yeni bir yutucu plaka geometrisi tasarlanmış ve imal edilmiştir. Konik yayların çapraz sıralı olarak monte edildiği yutucu plakalı ve karşılaştırma amaçlı düz yutucu plakalı kolektörlerden ibaret test düzeneği kurulmuştur. Çapraz sıralı konik yaylarla yüzey alanının, akışkan ile yutucu plaka etkileşiminin ve türbülans etkisinin artırılarak termal verimin yükseltilmesi amaçlanmıştır. Sistemin performansı deneysel olarak test edilmiştir. Deneylerde havanın kollektöre giriş ve çıkış sıcaklıkları, global radyasyon, kollektörden havanın çıkış hızı, yutucu plaka sıcaklıkları, kollektör kasası dış yüzey sıcaklığı ve saydam örtü sıcaklıkları ölçülmüştür. Yapılan ölçümlere dayalı olarak ısıl verimi hesaplanmıştır. Elde edilen deneysel verilerle sistemin Bulanık Mantık modeli oluşturulmuş ve üç farklı üyelik fonksiyonuna (Üçgen-Gaussian-Trapez) göre giriş parametrelerine dayalı olarak havanın kollektörden çıkış sıcaklığı ve ısıl verim modellenmiştir. Sonuç olarak bulanık mantık ile üçgen üyelik fonksiyonuna göre yapılan modellemenin sıcaklık için % 96, termal verim için ise % 94-95 oranında deneysel verilerle uyumlu olduğu sonucu elde edilmiştir.Anahtar Kelimeler: Güneş enerjili hava kollektörü, konik yay, bulanık mantık, modelleme, çıkış sıcaklığı, termal verim. The Fuzzy Logic Modeling of Solar Air Heater HavingConical Springs Attached on the Absorber Plate ABSTRACT Solar air collectors (SAC) are usually used for space heating and drying of agricultural products. In SACs, thermal efficiency is low due to the low heat transfer between the absorber plate and fluid. In this study, a novel absorber plate geometry is designed and manufactured for enhancing the thermal efficiency. A comparative test system consisting of a flat absorber plate with staggered conical springs and a collector with flat absorber plate was established. It is aimed to increase the thermal efficiency by increasing the turbulence effect of the surface area, the interaction between the fluid and the absorber plate with the staggered conical springs. The performance of the systems was tested experimentally. In the experiments, inlet and outlet temperature of the collectors, global radiation, the exit velocity of air from the collectors, the absorber plate temperatures, backside surface temperature and transparent cover temperatures were measured. The thermal efficiency was calculated based on the measurements. Consisting of the fuzzy logic model of the system with the experimental data obtained, the outlet air temperature of the collector and thermal efficiency is modeled based on the input parameters according to three different membership functions (Triangle-Gaussian-Trapeze). As a re...

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Study of a solar air flat plate collector: use of obstacles and application for the drying of grape

Cited by 91 publications

References 3 publications

Heat Transfer Optimization in Air Flat Plate Solar Collectors Integrated with Baffles

Heat Transfer Optimization in Air Flat Plate Solar Collectors Integrated with Baffles

Studi Numerik Penambahan Obstacle Terhadap Kinerja Kolektor Surya Pemanas Udara dengan Plat Penyerap Jenis V-Corrugated

Yutucu Plaka Üzerine Konik Yayların Yerleştirildiği Güneş Enerjili Hava Kollektörünün Bulanık Mantık ile Modellenmesi

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