Investigation of thermal performance of-double pass-flat and v-corrugated plate solar air heaters

El-Sebaii, A.A.; Aboul-Enein, S.; Ramadan, M.R.I.; Shalaby, S.M.; Moharram, B.M.

doi:10.1016/j.energy.2010.11.042

Cited by 181 publications

(67 citation statements)

References 25 publications

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“…Improvement of solar collector efficiency in many devices has been investigated by introducing free convection [6] and force convection [7], extending heat transfer area [8], and increasing flow turbulence in a solar air heater channel with vortex generators [9,10] and welding V-ribs [11]. The application of the recycle effect concept to solar air heaters has been confirmed with technical feasibility in double-pass [12] and multi-pass [13] operations, and the recycling double-pass design with eddy promotion [14,15] results in enhancement of the convective heat-transfer coefficient. The new designs in the present study of solar air collectors were investigated, adopting the V-corrugated recycling double-pass device to increase the convective heat-transfer coefficients due to both the enhancement of flow turbulence and enlargement of the heat-transfer area, as shown in Figure 1a,b, respectively.…”

Section: Introductionmentioning

confidence: 86%

Efficiency of Recycling Double-Pass V-Corrugated Solar Air Collectors

Ho¹,

Hsiao²,

Chang³

et al. 2017

Energies

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Abstract:The influence of recycling on double-pass solar air collectors with welding of the V-corrugated absorber has been studied experimentally and theoretically. Welding the V-corrugated absorber and the recycle-effect concept to the solar air collector was proposed to strengthen the convective heat-transfer coefficient due to turbulence promotion. Both the recycle effect and the V-corrugated absorber can effectively enhance the heat transfer efficiency compared to various designs such as single-pass, flat-plate double-pass, and double-pass wire mesh packed devices. Recycling operations and welding the V-corrugated absorber could enhance the collector efficiency by increasing the recycle ratio, incident solar radiations, and air mass flow rates. The most efficient and economical operating conditions were found at R ≈ 0.5, with relatively small hydraulic dissipated energy compensation. It was found that the turbulence intensity increase from welding the V-corrugated absorber into the solar air collector channel could compensate for the power consumption increase, when considering economic feasibility.

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Section: Introductionmentioning

confidence: 86%

Efficiency of Recycling Double-Pass V-Corrugated Solar Air Collectors

Ho¹,

Hsiao²,

Chang³

et al. 2017

Energies

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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

“…Plat penyerap dapat terbuat dari plat datar, plat gelombang atau plat yang ditekuk membentuk saluran segitiga atau v-corrugated. ElSebaii et al [11] menyatakan bahwa kolektor udara dengan plat penyerap tipe v-corrugated mempunyai efisiensi 11 -14% lebih tinggi dari kolektor dengan plat datar. Kedua kolektor yang dibandingkan merupakan kolektor dengan dua laluan.Dari studi eksperimental, Naphon [13] menemukan bahwa saluran dengan plat v-corrugated pada sebelah atas dan bawah menghasilkan peningkatan perpindahan kalor sebanyak 3,51 kali plat datar dan penurunan tekanan 1,96 kali lebih tinggi dari plat datar.Gao et al [14] dan Tao et al [15] menemukan bahwa pemanas udara tipe cross-corrugated mempunyai kinerja termal lebih baik dari tipe plat datar.…”

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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“…The most important advantage of these type of collectors includes low construction costs and slight effect of pressure drops. However, their main drawback is the low heat transfer coefficient between the absorber plate and air stream due to poor thermal conductivity and low heat capacity of air (El-Sebaii et al, 2011a). The principle parts of flat plate solar collector are cover sheet, absober plate and insulation.…”

Section: Flat Plate Solar Collectormentioning

confidence: 99%

Experimental analysis of air flow patterns in perfomance of flat plate solar collectors

Ramadhani¹,

Minja²,

Njau³

2015

Afr. J. Agric. Res.

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Solar drying is one of the promising methods of reducing post-harvest losses in rural areas. Studies have shown that, heat transfer mechanisms in a solar collector influences the performance of solar dryers. This study aims at improving heat transfer in flat plate solar collectors by designing different air flow patterns inside the collector. Three flat plate solar collectors were constructed by using Pterocarpus timber (Mninga) and tested for their effect in heat transfer at various flow patterns. Three different flow patterns namely: single duct front pass, double duct parallel flow and double duct counter flow were designed and tested. Experimental results show that collector efficiency of single duct front pass, double duct front pass and double duct counter flow were 30.6, 36.1 and 38.2% respectively. It was found that, double duct flow gives improved performance compared to single duct flow due to the increased heat transfer area. In additional, double duct counter flow showed superior performance compared to double duct parallel flow due to extended heat transfer area and the advantage of air preheating at the inlet which reduces heat losses through glazing. Through this study, it was concluded that, solar collector designs with double duct counter flow can improve collector performance for up to 8.3% compared to single duct front pass.

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Investigation of thermal performance of-double pass-flat and v-corrugated plate solar air heaters

Cited by 181 publications

References 25 publications

Efficiency of Recycling Double-Pass V-Corrugated Solar Air Collectors

Efficiency of Recycling Double-Pass V-Corrugated Solar Air Collectors

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

Experimental analysis of air flow patterns in perfomance of flat plate solar collectors

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