Single and double pass solar air heaters with wire mesh as packing bed

Aldabbagh, L.B.Y.; Egelioğlu, Fuat; İlkan, Mustafa

doi:10.1016/j.energy.2010.05.028

Cited by 154 publications

(73 citation statements)

References 21 publications

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“…0.667 to 0.880 and 0.599 to 0.816 respectively. Aldabbagh et al [28] experimentally investigated the thermal performance of double pass steel wire screen packed bed solar air heater and reported that the efficiency of the double pass is found to be higher than the single pass. The counter and parallel flow packed bed solar air heaters are investigated theoretically and experimentally by Dhiman et al [29].…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of optically semi-transparent material packed-bed solar air heater

Chouksey

Sharma

2017

International Journal of Thermodynamics

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This paper deals with theoretical analysis of performance of solar air collector having its duct packed with optically semitransparent materials. The heat transfer equations for two dimensional fully developed fluid flows under quasisteady state conditions have been developed in order to analyze the thermal, thermo-hydraulic and exergy performance and to study the effect of system and operating parameters. A computer programme is developed in C ++ language to estimate the temperature rise of entering air for evaluation of performance by solving the governing equations numerically using relevant correlations for heat transfer coefficient for packed bed systems. Results of air temperature rise and thermal efficiency obtained from the analysis have been compared with available experimental results and results are found fairly in closed agreement. It has been found that there is considerable enhancement in thermal efficiency with packed bed collector. Effect of total bed depth on efficiency show that there is an upper limiting value of total bed depth beyond which the thermal efficiency begins to fall again and this type of characteristics behavior is observed at all mass flow rate. It is also noticed that there exists an optimal value of effective and exergy efficiencies for a given mass flow rate.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of optically semi-transparent material packed-bed solar air heater

Chouksey

Sharma

2017

International Journal of Thermodynamics

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“…Aldabbah vd., tek ve çift geçişli güneş enerjili hava kollektörlerinde akışkan yatağı olarak tel örgü yapısını kullanmışlar ve bunun performansını deneysel olarak test etmişlerdir. 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].…”

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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“…13 that the efficiency increases with the increase in mass flow rate. Aldabbagh et al [33] reported that the efficiency increases with the increase in mass flow rate and has reached 27% when the mass flow rate was equal to m = 0.012 kg/s and 42% of the flow rate equal to m = 0.018 kg/s for double pass collector's heater and the single-pass collector. He indicated that the thermal efficiency increases with increasing mass flow rate m = 0.012 kg/s, and the efficiency was η = 39% and η = 36% for m = 0.018 kg/s.…”

Section: (M)mentioning

confidence: 99%

Collector Efficiency by Single Pass of Solar Air Heaters with and without Using Fins

Chabane¹,

Moummi²,

Benramache³

et al. 2013

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Abstract. This paper presents the study of heat transfer in a solar air heater by using new design of solar collector. The collector efficiency in a single pass of solar air heater without, and with using fins attached under the absorbing plate has been investigated experimentally. Due to adding the fins to the interior of an absorber plate, the desirable effect of increasing the heat transfer coefficient compensates for the undesirable effect of decreasing the driving force (temperature difference) of heat transfer, while the attached fins provide an enlarged heat transfer area. In this study, the absorbing plate of solar collector is attached with fins for further improved performance. The improvements of collector efficiencies in the single pass solar air heaters with, and without fins attached; increase with increasing the mass flow rate, especially for operating at lower air flow rate. Experiments were performed for two air mass flow rates of 0.012 and 0.016 kg/s. Moreover, the maximum efficiency obtained for the 0.012 and 0.016 kg/s with, and without fins were 40.02, 51.50% and 34.92, 43.94% respectively. A comparison of the results of the mass flow rates by solar collector with, and without fins shows a substantial enhancement in the thermal efficiency.

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Single and double pass solar air heaters with wire mesh as packing bed

Cited by 154 publications

References 21 publications

Performance analysis of optically semi-transparent material packed-bed solar air heater

Performance analysis of optically semi-transparent material packed-bed solar air heater

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

Collector Efficiency by Single Pass of Solar Air Heaters with and without Using Fins

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