An Experimental Comparison of the Performance of Various Evacuated Tube Solar Collector Designs&#x0D; &#x0D; &#x0D; TRANSLATE with x&#x0D; &#x0D; English&#x0D; &#x0D; &#x0D; &#x0D; &#x0D; &#x0D; &#x0D; Arabic&#x0D; Hebrew&#x0D; Polish&#x0D; &#x0D; &#x0D; Bulgarian&#x0D; Hindi&#x0D; Portuguese&#x0D; &#x0D; &#x0D; Catalan&#x0D; Hmong Daw&#x0D; Romanian&#x0D; &#x0D; &#x0D; Chinese Simplified&#x0D; Hungarian&#x0D; Russian&#x0D; &#x0D; &#x0D; Chinese Traditional&#x0D; Indonesian&#x0D; Slovak&#x0D; &#x0D; &#x0D; Czech&#x0D; Italian&#x0D; Slovenian&#x0D; &#x0D; &#x0D; Danish&#x0D;

Sana Said,Lioua Kolsi,Ridha Ajjel,Salem Algarni,Talal Alqahtani,Sofiene Mellouli,Kaouther Ghachem

doi:10.3390/su15065533

Abstract

An experimental study was carried out to assess the thermal performance of a few evacuated tube solar collectors (ETSCs) for water heating. The thermal performance of two kinds of ETSC (heat pipe ETSC and direct-flow ETSC) was investigated using an indoor experimental apparatus in lab testing conditions with a solar simulator. Several experimental tests were carried out for the heat pipe ETSC system under different operating conditions, such as the solar intensity (300, 500, and 1000 W/m2) and the tilt angle (0°, 30° and 90°) of the ETSC and the water flow rate (0.6, 1.2, and 2.4 LPM). Moreover, four configurations of direct-flow ETSC (U tube, double U tubes, coaxial tubes, and helical tube) were examined and compared to the conventional heat pipe ETSC. The results of the experiment proved that the ETSC system presents a great performance at higher solar irradiance and lower water flow rates, and the experiments indicated that with a 30° tilt angle, the ETSC reaches the maximum thermal efficiency of 36%. Furthermore, compared to the conventional heat pipe ETSC and the other proposed configurations of direct-flow ETSCs, the helical tube-based ETSC has a better thermal efficiency, 69%, and can be considered a greater potential heat exchanger that can be integrated in ETSCs. To the best of our knowledge, it is the first time this helical tube type been integrated into the ETSC and tested under these conditions.    TRANSLATE with x  English       Arabic Hebrew Polish   Bulgarian Hindi Portuguese   Catalan Hmong Daw Romanian   Chinese Simplified Hungarian Russian   Chinese Traditional Indonesian Slovak   Czech Italian Slovenian   Danish Japanese Spanish   Dutch Klingon Swedish   English Korean Thai   Estonian Latvian Turkish   Finnish Lithuanian Ukrainian   French Malay Urdu   German Maltese Vietnamese   Greek Norwegian Welsh   Haitian Creole Persian         //      TRANSLATE with   COPY THE URL BELOW   Back   EMBED THE SNIPPET BELOW IN YOUR SITE   Enable collaborative features and customize widget: Bing Webmaster Portal Back  // 

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