Farklı Isı Transfer Akışkanı Boru Konfigürasyonları Altında Termal Enerji Depolama Sistemlerinde Faz Değiştiren Malzemenin Performans Değerlendirmesi

Abstract

Bu çalışma, RT35HC faz değiştiren malzeme ile doldurulmuş bir kabuk-borulu gizli ısı depolama ünitesinde, farklı ısı transfer akışkanı (ITA) boru konfigürasyonlarının erime performansı ve enerji depolama özelliklerine etkilerini üç boyutlu sayısal olarak incelemektedir. Beş farklı ITA boru düzeni (Straight, 1P-1T, 1P-2T, 2P-1T ve 2P-2T) hem yatay hem dikey oryantasyonlarda değerlendirilmiştir. Tek borulu tasarımlarda, boru yüzey alanı eşitlenerek geometrinin erime süreci üzerindeki etkisi tek başına değerlendirilmiştir. Çift borulu/çok turlu helislerde ise artan yüzey alanı ve azalan FDM hacminin birlikte etkisi dikkate alınmıştır. Performans değerlendirmesi; sıvı fraksiyonu, depolanan enerji, ortalama ısı akısı ve ortalama Nusselt sayısı parametreleri üzerinden yapılmıştır. Analizler, dikey oryantasyonda 2P-2T’nin Straight konfigürasyona kıyasla %122.6 daha fazla enerji depoladığını ve erime süresinin belirgin şekilde kısaldığını ortaya koymuştur. Elde edilen bulgular, boru geometrisinin ve sistem oryantasyonunun erime dinamikleri ile enerji depolama verimliliği üzerindeki kritik rolünü vurgulamakta ve gizli ısı termal enerji depolama sistemleri için tasarım optimizasyonuna katkı sunmaktadır.

Keywords

• Faz değiştiren malzeme
• Gizli ısı depolama
• Kabuk-borulu ısı değiştirici
• Helisel boru
• HAD

Performance Assessment of Phase Change Material in Thermal Energy Storage Systems under Different Heat Transfer Fluid Pipe Configurations

Abstract

This study presents a three-dimensional numerical investigation on the melting performance and energy storage characteristics of a shell-and-tube latent heat thermal energy storage (LHTES) unit filled with RT35HC phase change material (PCM). Five different heat transfer fluid (HTF) tube configurations—Straight, 1P-1T, 1P-2T, 2P-1T, and 2P-2T—were analysed under both horizontal and vertical orientations. In single-tube designs, the HTF surface area was equalized to evaluate the effect of geometry on the melting process independently. In multi-tube/multi-turn helical designs, the combined influence of increased surface area and reduced PCM volume was considered. Performance evaluation was carried out in terms of liquid fraction, stored energy, average heat flux, and average Nusselt number. The analyses revealed that, in vertical orientation, the 2P-2T configuration stored 122.6% more energy than the Straight configuration, with a significantly shorter melting duration. These findings emphasize the critical role of tube geometry and system orientation in influencing melting dynamics and energy storage efficiency, providing valuable guidance for LHTES system design optimization.

Keywords

• Phase change material
• Latent heat storage
• Shell-and-tube heat exchanger
• Helical pipe
• CFD

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