Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses
Yıl: 2003 Cilt: 27 Sayı: 3 Sayfa Aralığı: 123 - 134 Metin Dili: Türkçe İndeks Tarihi: 29-07-2022
Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses
Öz: Bu çalışmada, açık polietilen (PE) ve polyester malzemeden yapılmış ısı perdelerinin plastik tünel seralarda mikro-klima ve toplam ısı kayıp katsayısına etkisi incelenmiştir. Plastik tünel seralar 6 m genişlik, 20 m uzunluk ve 3 m yüksekliğindedir. Araştırmada üç farklı düzenleme yapılmıştır: (1) perdesiz tek katlı tünel (kontrol), (2) PE perdeli tek katlı tünel ve (3) polyester perdeli tek katlı tünel. UV + IR katkılı PE ve polyester malzemeden yapılmış ısı perdeleri, plastik tünel seralarda 2.5 m yükseklikte yerleştirilmiş ve tellerle desteklenmiştir. Hava sıcaklığı, bağıl nem, rüzgar hızı, güneş ışınımı ve fotosentez için etkin ışınım (PAR) değerleri ölçülmüş ve veri kaydedicide kaydedilmiştir. Plastik tünel seralarda; toplam ısı kayıp katsayısı, verilen ısı miktarı, hava sızdırmazlık için kontrol faktörü , ısı kayıp hızı ve ısı perdesi etkinliği hesaplanmıştır. Polyester ve PE perdeli seralarda, iç ortam sıcaklığının dış ortamdan 4.8 $^circ$ C ve 2.5 $^circ$ C daha yüksek olduğu belirlenmiştir. Plastik tünel seralarda toplam ısı kayıp katsayılarının önemli ölçüde farklı olduğu belirlenmiştir. Toplam ısı kayıp katsayısı ile rüzgar hızı ve dış ortam sıcaklığı arasındaki ilişkiler modellenmiştir. Perde etkinlik faktörü; PE perde için % 16, polyester perde için % 19.8 olarak belirlenmiştir.
Anahtar Kelime: Konular:
Plastik tünel seralarda ısı perdelerinin mikrokima ve toplam ısı kayıp katsayısına etkisi
Öz: The objective of the present study was to evaluate the effects of thermal screens made of clear polyethylene (PE) and polyester material on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. The dimensions of the plastic tunnels were: width 6 m, length 20 m and height 3 m. Three different installations were used: (1) a single cover without a screen (as a control); (2) a single cover with a PE screen; and (3) a single cover with a polyester screen. The thermal screens made of PE with UV+1R additives and polyester materials were placed at a height of 2.5 m in the plastic tunnels, and supported with wires. Air temperature, relative humidity, wind speed, solar radiation and photosynthetically active radiation (PAR) were measured and recorded on a data-logger. In the plastic tunnels, the overall heat loss coefficient, heat input, the control factor for air-tightness, the rate of heat loss and the thermal screen effectiveness were calculated. The results showed that the polyester and PE screens were able to keep the air temperature inside the plastic tunnels 4.8 $^circ$ C and 2.5 °C higher than that outside, respectively. Comparison of the calculated overall heat loss coefficients shows that the differences in the values between the plastic tunnels were large. The relationships between the overall heat loss coefficient and the wind speed, and the outside temperature were modeled, including the measured and calculated values. It was found that the thermal screen effectiveness was 16% and 19.8% for the PE and polyester screens, respectively.
Anahtar Kelime: Konular:
Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
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| APA | ÖZTÜRK H, BAŞÇETİNÇELİK A (2003). Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. , 123 - 134. |
| Chicago | ÖZTÜRK H. Hüseyin,BAŞÇETİNÇELİK Ali Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. (2003): 123 - 134. |
| MLA | ÖZTÜRK H. Hüseyin,BAŞÇETİNÇELİK Ali Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. , 2003, ss.123 - 134. |
| AMA | ÖZTÜRK H,BAŞÇETİNÇELİK A Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. . 2003; 123 - 134. |
| Vancouver | ÖZTÜRK H,BAŞÇETİNÇELİK A Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. . 2003; 123 - 134. |
| IEEE | ÖZTÜRK H,BAŞÇETİNÇELİK A "Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses." , ss.123 - 134, 2003. |
| ISNAD | ÖZTÜRK, H. Hüseyin - BAŞÇETİNÇELİK, Ali. "Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses". (2003), 123-134. |
| APA | ÖZTÜRK H, BAŞÇETİNÇELİK A (2003). Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. Turkish Journal of Agriculture and Forestry, 27(3), 123 - 134. |
| Chicago | ÖZTÜRK H. Hüseyin,BAŞÇETİNÇELİK Ali Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. Turkish Journal of Agriculture and Forestry 27, no.3 (2003): 123 - 134. |
| MLA | ÖZTÜRK H. Hüseyin,BAŞÇETİNÇELİK Ali Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. Turkish Journal of Agriculture and Forestry, vol.27, no.3, 2003, ss.123 - 134. |
| AMA | ÖZTÜRK H,BAŞÇETİNÇELİK A Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. Turkish Journal of Agriculture and Forestry. 2003; 27(3): 123 - 134. |
| Vancouver | ÖZTÜRK H,BAŞÇETİNÇELİK A Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses. Turkish Journal of Agriculture and Forestry. 2003; 27(3): 123 - 134. |
| IEEE | ÖZTÜRK H,BAŞÇETİNÇELİK A "Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses." Turkish Journal of Agriculture and Forestry, 27, ss.123 - 134, 2003. |
| ISNAD | ÖZTÜRK, H. Hüseyin - BAŞÇETİNÇELİK, Ali. "Effect of thermal screens on the microclimate and overall heat loss coefficient in plastic tunnel greenhouses". Turkish Journal of Agriculture and Forestry 27/3 (2003), 123-134. |
