Flow distribution in unglazed transpired plate solar air heaters of large area

Gunnewiek, Lowy; Brundrett, E.; Hollands, K.G.T.

doi:10.1016/s0038-092x(96)00083-7

Cited by 70 publications

(30 citation statements)

References 5 publications

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“…In the study, the author acknowledges that heat transfer from the back of plate might occur for tall vertical collector. Moreover, this could be due to buoyancy-dominated pattern of the vertical flow and causes heat transfer takes place from the back of the plate [5]. Present results show that vertical flow heat transfer is significant for the total air temperature rise.…”

Section: Discussionmentioning

confidence: 65%

“…In terms of the energy balance the authors acknowledge additional heat transfer from the plate to the air in the plenum is possible, which has been indicated by Gunnewiek et. al [5] simulation results. However this part of heat transfer is ignored due to the absence of heat transfer correlation between the back-of-plate and the vertical airflow.…”

Section: Introductionmentioning

confidence: 99%

“…The non-uniform flow is favoured in flows that are buoyancy dominated. Besides improving the efficiency, non-uniform flow is also keeping the fan power at a minimum, so there is a dual benefit [5]. Poor flow distribution occur in large building applications; this has been shown by infrared photographs [4].…”

Section: Introductionmentioning

confidence: 99%

“…Though there are quite a number of studies that ignored the heat transfer from the back of the plate, study [5] has proved that this part of heat transfer is possible and the authors [4,6] also acknowledge this possibility if the collector is vertically tall. Thus, this paper is to discuss the heating performance of this system through experimental tests which involve the study of temperature rise along the vertical air flow in the plenum.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Performance of Unglazed Transpired Solar Collector for Air Heating

Chan

Riffat

Zhu

2011

Linköping Electronic Conference Proceedings

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Unglazed transpired solar collectors are usually mounted on the side of the building that receives the most sunlight. It is a fan-assisted system, whereby air is drawn through the holes into the plenum and the warm air is then ducted into the building. The primary reason for using the unglazed transpired metal plate as the solar collector is not only to absorb the solar heat but also to reduce the convection heat loss. These in return will have higher heat exchange effectives and heating efficiency. Though many research have been carried out to study the Nusselt number correlations, heat exchange effectiveness, wind effects and pressure drop, yet only hand full of research that involved heat transfer study that including the vertical airflow in the plenum. This paper is to assess the heating performance of this system through experimental tests which involve the study of temperature rise along the vertical air flow in the plenum. Results show that the temperature of the air flowing vertically is increasing gradually from the bottom to the top of the plenum. This is contrast with the previous studies which assumed that the temperature of the air in the plenum is constant and same as the outlet air temperature at the top of the plenum. The temperature rise is increasing with solar radiation intensity. Temperature rise along the plenum contributes between 30 to 60% of the total temperature rise at a constant suction velocity. On the other hand, temperature rise is decreasing with suction velocity. Values of temperature rise along the plenum are between 30 to 50% of the total temperature rise for suction velocity of 0.03 to 0.05 ms -1 at 600Wm -2 of solar radiation. T herefore, this study has proved that heat transfer of vertical airflow in the plenum has a crucial heating effect.

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Section: Discussionmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental Performance of Unglazed Transpired Solar Collector for Air Heating

Chan

Riffat

Zhu

2011

Linköping Electronic Conference Proceedings

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“…Model, rüzgarsız koşul için geliştirildi ve panelin arka tarafındaki ısı transfer hesaplamalarını da içermektedir. Gunnewiek ve arkadaşları, rüzgarın hava sızdırmalı güneş toplayıcısındaki akış dağılımına etkisini incelemiştir [18]. Gunnewiek, rüzgar etkisinin toplayıcı iç hacmindeki akışa etkisini incelemiştir [19].…”

Section: Introductionunclassified

Endüstriyel Tesisler için Güneş Duvarı Performansının İncelenmesi

Akhan¹,

Eryener²

2017

Çukurova Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖzBu çalışmada, Türkiye'de uygulaması yapılan ilk hava sızdırmalı güneş duvarın saha performansının analizi yapılmıştır. 2012 yılında Çayırova-Kocaeli'nde bir otomotiv tesisinde ısıtma ve havalandırma amaçlı olarak uygulaması yapılan 770 m 2 'lik güneş duvarının performansı, iki yıllık bir süre zarfında kış dönemlerde üçer aylık periyodlar halinde bina yönetim sistemi vasıtasıyla incelenmiştir. Ayrıca, sistemin teorik analizi, bir güneş duvarı simülasyon yazılımı kullanılarak yapılmış ve elde edilen sonuçlar saha verileri ile karşılaştırılmıştır. Simülasyon sonuçlarına benzer olarak, 2013 yılında 113,037 kWh enerji, 2014 yılındaki 246,924 kWh ısı enerjisi üretmiş ve dönemsel olarak %62 varan bir enerji tasarruf elde edilmiştir. Anahtar Kelimeler: Güneş duvarı, Güneş enerjisi ile hava ısıtma Investigation of Solar Wall Performance for Industrial Facilities AbstractIn this study, the performance of field tests of first unglazed transpired solar wall installation in Turkey is analyzed. The performance of the 770 m 2 solar wall in an automotive plant in Çayırova -Kocaeli in 2012, has been monitored for winter periods of two years via a building management system. In addition, the theoretical analysis of the system was made by a simulation software for solar wall and the results obtained were compared with the field data. Solar wall delivered 113.037 kWh thermal energy in 2013, 246.924 kWh thermal energy in 2014 and energy savings of up to 62% have been achieved, which are similar to simulated results.

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