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            暖通空調雜志社>期刊目次>2021年>第8期

            真空管太陽能空氣集熱系統阻力影響因素研究

            Influencing factors of resistance for evacuated tube solar air collecting systems

            王登甲[1] 任曉帥[2] 劉艷峰[3] 丁奎[4]
            [1]西部綠色建筑國家重點實驗室 [1]西安建筑科技大學 [2]西安建筑科技大學 [3]西部綠色建筑國家重點實驗室 [3]西安建筑科技大學 [4]西安建筑科技大學

            摘要:

            通過對真空管太陽能空氣集熱系統內部流動過程的分析,建立了集熱系統阻力計算模型,分析了不同設計參數下真空管太陽能空氣集熱器、串聯集熱系統阻力變化規律。結果表明:隨著集熱工質溫度升高,集熱器阻抗呈指數減小趨勢;各影響因素中,串聯集熱器數量和工質流量對系統阻力影響最大,集熱系統各組集熱器阻力隨串聯集熱器數量增加呈增長率減小的增大趨勢,隨質量流量增大呈指數增大趨勢,最大值為最小值的3.6倍。此外,系統阻力隨環境溫度、太陽輻照度、進口溫度升高呈線性增大趨勢,其中環境溫度對系統阻力的影響可忽略不計。通過該研究建立的真空管太陽能空氣集熱系統阻力計算模型及總結得到的單位面積集熱器阻力計算表,可為該集熱器、集熱系統阻力理論計算提供便捷可靠的依據。

            關鍵詞:真空管,太陽能,集熱器,參數,阻力,阻抗

            Abstract:

            Through the analysis of internal flow process of the evacuated tube solar air collecting system, establishes a resistance calculation model for the heat collecting system, and analyses the resistance changes of evacuated tube solar air collectors and series heat collecting system under different design parameters. The results show that with the increase of heat collector temperature, the impedance decreases exponentially. Among the various influencing factors, the number of series collectors and the working fluid flow have the greatest impact on system resistance. The resistance of each group of collectors shows an increasing trend of decreasing growth rate with the increase of the number of series collectors. With the increase of mass flow, the system resistance increases exponentially, and the maximum resistance is 3.6 times the minimum value. With the increase of ambient temperature, solar radiation intensity and inlet temperature, the system resistance shows a positive proportional increase trend, and the influence of the ambient temperature on the system resistance is negligible. The resistance calculation model of the evacuated tube solar air collector system established by this research and the calculation table of the resistance per unit area of the collector can provide a convenient and reliable basis for the theoretical calculation of the resistance of the collector and collecting system.

            Keywords:evacuatedtube,solarenergy,aircollector,parameter,resistance,impedance

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