Investigation of temperature distribution on a new linear Fresnel receiver assembly under high solar flux

Abstract

Summary A linear Fresnel collector design with an operation temperature of 300°C or above typically requires a solar flux concentration ratio of at least 20 on the surfaces of the receiver assembly. For the commercial linear Fresnel collector design in this work, the receiver assembly includes a secondary reflector and an evacuated receiver tube. The high‐concentration solar flux may impose additional operating‐temperature requirements on the secondary reflector and receiver tube. Thus, a careful heat‐transfer analysis is necessary to understand the operating temperature of the receiver assembly component surfaces under design and off‐design conditions to guide appropriate material selections. In this work, a numerical heat‐transfer analysis is performed to calculate the temperature distribution of the surfaces of the secondary reflector and receiver glass envelope for a commercial collector design. Operating conditions examined in the heat‐transfer analysis include various wind speeds and solar concentration ratios. The results indicate a surface temperature higher than 100°C on the secondary reflector surface, which suggests that a more advanced secondary reflector material is needed. The established heat‐transfer model can be used for optimization of the other types of linear Fresnel collectors.

Doğrusal Fresnel kolektörün performans analizi

“…HAD simülasyonları DFK'ün alıcısının rüzgâr yükünü hesaplamak veya zorlanmış taşınım koşullarındaki ısı transfer mekanizmalarını analiz etmek amacıyla da kullanılmaktadır. [13]'te değişik rüzgâr hızı ve yoğunlaştırma oranı çalışma koşullarında sayısal bir ısı transfer analizi gerçekleştirilmiştir. HAD kullanılarak çözülen ısı transfer mekanizması iletim, doğal, zorlanmış taşınım ve ışınımı içermektedir.…”