Effect of porous media on the performance of the double-pass flat plate solar air heater

Author(s):  
Paisarn Naphon
2021 ◽  
Vol 39 (1A) ◽  
pp. 79-88
Author(s):  
Jalal M. Jalil ◽  
Shrooq J. Ali

This study describes an experimental investigation of the thermal efficiency of stainless steel mesh and steel wool as a porous medium in the lower channel of a double pass solar air heater. An experimental setup was planned and developed. Various types of porous media with high thermal conductivity and with different porosities have been tested. The effects of the porosity of wire mesh, the thermal conductivity of porous media, mass flow rate, and the intensity of radiation have been studied. Experimental results show that thermal efficiency with using porous media is greater than without using porous media. When used steel wool as a porous medium, the thermal efficiency reached 79.82 percent while it can be achieved 76.  The percent by using stainless mesh as porous material. The reduction in porosity increasing thermal efficiency. The thermal efficiency of multi-pass solar air collector when used steel wool as porous media is 6, 12.6 and31.7percent higher than without porous media at porosity 98.75, 97.5, and 96.25percent. While it can increase 8.1 and 28.5 percent at porosity 97.875 and 95.75 percent when using stainless steel as porous media.


2021 ◽  
Vol 1 (01) ◽  
pp. 101-106
Author(s):  
Dedet Hermawan S

Penelitian ini menguji pengaruh kecepatan udara dan efisiensi pemanas udara surya double-pass flat plate dengan dua penutup kaca terhadap kinerja unit desalinasi surya berbasis pompa panas dengan menggunakan proses humidifikasi dan dehumidifikasi. Unit ini terdiri dari heat pump, humidifier, dehumidifier, dan double-pass flat plate solar air heater dengan dua penutup kaca. Penelitian ini dilakukan dalam eksperimen dalam ruangan. Energi surya yang dihasilkan dari simulator surya menggunakan lampu halogen. Pada penelitian ini debit aliran udara divariasikan pada 3 m/s, 4 m/s, 5 m/s, dan 6 m/s, sedangkan intensitas radiasi matahari divariasikan pada 828 W/m², 924 W/m², dan 1014 W/m². Pada setiap variasi kecepatan udara, suhu air laut dikondisikan pada suhu konstan 45oC, kompresor dioperasikan pada putaran konstan 900 rpm, laju aliran volumetrik air laut masuk 300 liter/jam ke humidifier dan air laut dalam sistem ini disirkulasikan kembali. Hasil penelitian menunjukkan bahwa volume produksi air tawar meningkat dengan meningkatnya kecepatan udara masuk ke dalam humidifier. Unit desalinasi surya ini mampu menghasilkan air tawar maksimum 3691 mililiter/jam pada kecepatan udara 6 m/s dan intensitas radiasi matahari 1014 W/m².  


2017 ◽  
Vol 7 (2) ◽  
pp. 59
Author(s):  
Dedet Hermawan Setiabudi ◽  
Muhrom Khudhori

This research examined the effect of air velocity and the efficiency of double-pass flat plate solar air heater with two glass covers on the performance of solar desalination unit based on heat pump with using humidification and dehumidification processes. This unit consists of a heat pump, humidifier, dehumidifier, and double-pass flat plate solar air heater with two glass covers. The research was conducted in an indoor experiment. Solar energy generated from solar simulator using halogen lamps. In this research the air flow rate was varied at 3 metres per second, 4 metres per second, 5 metres per second, and 6 metres per second, while the intensity of solar radiation at 828 Watts per meter squared. At each variation in air velocity, sea water temperature was conditioned at a constant temperature of 45 degrees celcius, the compressor was operated at a constant rotation of 900 rpm, volumetric flow rate of sea water inlet 300 liters per hour into humidifier and sea water in this system was re-circulated. The research result showed that the volume of fresh water production increases with increasing air velocity inlet into humidifier. This solar desalination unit could produce fresh water maximum 2470 milliliters per hour in air velocity 6 metres per second.


2018 ◽  
Author(s):  
D.V.N. Lakshmi ◽  
Palanisamy Muthukumar ◽  
Dr.Apurba Layek ◽  
Abhimanyu Kumar Singh ◽  
Sushoban Das

Solar Energy ◽  
2011 ◽  
Vol 85 (7) ◽  
pp. 1479-1487 ◽  
Author(s):  
M.F. El-khawajah ◽  
L.B.Y. Aldabbagh ◽  
F. Egelioglu

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