Analytical parametric study of an evacuated tube solar air heater with perforated twisted tape for industrial heating applications

Öz

A major challenge in creating a vacuum solar tube air collector for industrial use is selecting the optimal thermal networks to reach the desired temperature for a specific flow rate. To develop a thermal network model using empirical correlations for industrial process heat applications, a theoretical analysis is performed to evaluate design features like the diameter and length of the evacuated tubes, as well as the quantity of tubes in a module, all of which impact thermal performance. The results of the design parametric study indicate that a collector system is best characterized by 20 evacuated tubes, each with an absorber and transparent diameters of 47 mm & 58 mm length of 1800 mm, respectively. Additionally, as the number of collectors in a series network increase, there is a notable reduction in the temperature rise for each collection. Based on the thermal network composed of two modules operating at 300 kg/h can provide optimum performance. The results indicate that the proposed evacuated tube solar system is capable of efficiently supplying hot air at temperatures between 80 and 100 °C, making it suitable for a range of industrial process heating applications.

Anahtar Kelimeler

• Perforated twisted tape
• air heating systems
• solar collector networks baffle plates
• thermal modeling

Proje Numarası

The SERB of Indian Government provided funding for this research. (SUR/2022/004100).

Endüstriyel ısıtma uygulamaları için delikli bükümlü bantlı vakumlu tüplü güneş enerjili hava ısıtıcısının analitik parametrik çalışması

Öz

Endüstriyel kullanım için vakumlu güneş tüplü hava kollektörü oluşturmanın en büyük zorluğu, belirli bir akış hızı için istenen sıcaklığa ulaşmak için en uygun termal ağların seçilmesidir. Endüstriyel proses ısı uygulamalarına yönelik ampirik korelasyonları kullanarak bir termal ağ modeli geliştirmek için, tamamı termal performansı etkileyen, boşaltılan tüplerin çapı ve uzunluğunun yanı sıra bir modüldeki tüplerin miktarı gibi tasarım özelliklerini değerlendirmek üzere teorik bir analiz gerçekleştirilir. Tasarım parametrik çalışmasının sonuçları, bir kollektör sisteminin en iyi şekilde her biri emici ve şeffaf çapları 47 mm ve 58 mm uzunluğu 1800 mm olan 20 adet boşaltılmış tüp ile karakterize edildiğini göstermektedir. Ayrıca seri ağdaki toplayıcı sayısı arttıkça her bir toplama için sıcaklık artışında gözle görülür bir azalma meydana gelir. 300 kg/saat hızla çalışan iki modülden oluşan termal şebekeye dayalı olarak optimum performans sağlayabilir. Sonuçlar, önerilen boşaltılmış tüplü güneş enerjisi sisteminin 80 ila 100 °C arasındaki sıcaklıklarda sıcak havayı verimli bir şekilde sağlayabildiğini ve bu sistemin bir dizi endüstriyel proses ısıtma uygulaması için uygun olduğunu göstermektedir.

Anahtar Kelimeler

• Delikli bükümlü bant
• hava ısıtma sistemleri
• güneş enerjisi kolektör ağları bölme plakaları
• termal modelleme

Proje Numarası

The SERB of Indian Government provided funding for this research. (SUR/2022/004100).

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