Thermal Efficiency Comparison of Flat Plate and Evacuated Tube Solar Water Collectors

Yıl 2017, Cilt: 13 Sayı: 3, 133 - 139, 26.12.2017

Turhan Koyuncu

Öz

Flat plate and evacuated
tube solar water collectors are widely used for supplying hot water for
domestic and industrial applications in the world. However, there is no enough
information regarding thermal efficiencies of different type solar water
collectors for various environmental and climatic conditions. Therefore, in
this work; thermal efficiencies of different types of flat plate solar water
collector panels  such as aluminum,
copper, 304 chromium and evacuated tube have been compared.
It was seen from the results that the
efficiencies of aluminum and copper collector panels are changing between 56%...68%
while  the efficiencies of 304 stainless steel chromium panels are varied between 
67%...88. In addition, evacuated tube type solar
water collectors have less heat loss but lower absorber surface area to gross
area ratio (about 70%) when compared with flat plate solar water collectors.
Based on absorber surface area, evacuated tube type solar water collectors have
more efficiency than equivalent flat plate collectors. However in practical
applications, gross area of any solar water collector should be considered for
comparison. In this case, the efficiencies of evacuated tube type solar water
collectors are changing between 50%...70%. Besides, it should be kept in mind
that evacuated tube type solar water collectors can be preferred for cold
environmental and climatic conditions because of their less heat loss and cold
resistant. 

Anahtar Kelimeler

Efficiency, solar water collector, flat plate, evacuated tube, aluminium, copper

Kaynakça

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• URL-1 : “https://www.google.com.tr/search?q= sun+ position&source=lnms&tbm=isch&sa=X&sqi=2&ved=0ahUKEwjY06monoDTAhVGkRQKHa-tCLAQ_AUIBigB&biw= 1343&bih=633” Date : 31.03.2017
• URL-2 : “https://www.google.com.tr/search?q= evacuated +tube+collectors&source=lnms&tbm=isch&sa=X&ved=0ahUKEwj6yar3kv7SAhWE5xoKHaBjCoAQ_AUIBigB&biw=1343&bih=633” Date :30.03.2017