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首页> 外文期刊>Journal of Energy and Natural Resources >Thermal Efficiency Evaluation of a Solar Thermal Steam Generating System Using Thermosiphon Technique with Parabolic Trough Collector
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Thermal Efficiency Evaluation of a Solar Thermal Steam Generating System Using Thermosiphon Technique with Parabolic Trough Collector

机译：抛物线槽收集器使用热虹吸技术太阳能热蒸汽发生系统的热效率评价

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Parabolic trough solar collectors are the most widely used concentrators for solar thermal applications in the world. This is because very high temperatures of 150°C to 350°C can be attained with its use without any noticeable degradation in the performance of the collector. In this work, a parabolic trough collector (PTC) was designed using simple parabolic equations and constructed with locally sourced materials. The developed PTC was used to converge direct solar radiation to a heat receiver (a copper pipe enclosed in an evacuated glass tube) placed at the focal line of the trough to heat up the water in the pipe to steam. Natural circulation (thermosiphon) was employed to drive the water from the heat source to the heat sink (tank) with the difference in density as the driving force of the system. Temperature sensors were installed at different points of the solar thermal system to experimentally investigate temperature distribution within the system, hence thermal performance. A pressure sensor was also installed in the tank to measure the pressure within the system. The results obtained shows that the solar thermal system generated low-mid temperature steam of up to 105°C at a pressure of approximately 120 kPa on a day when the global solar radiation intensity attained a value of 1109.5 W/m~2. A thermosiphon mass flow rate of up to 0.042 kg/s was also recorded through a constant orifice of 12 mm diameter. The instantaneous efficiency of the receiver reached 46.48%.
机译：抛物线槽太阳能收集器是世界上最广泛应用的集中器，是世界上太阳能热应用的集中器。这是因为在收集器的性能下没有任何明显的降解，可以获得150℃至350℃的非常高的温度。在这项工作中，使用简单的抛物线方程设计了抛物线槽收集器（PTC），并用本地采购材料构造。开发的PTC用于将直接的太阳辐射与热接收器（封闭在抽空的玻璃管中的铜管）聚集在槽的焦线上，以将管道中的水加热到蒸汽。采用自然循环（热虹吸管）将来自热源的水驱动到散热器（罐），密度差为系统的驱动力。温度传感器安装在太阳能热系统的不同点，以通过实验研究系统内的温度分布，因此热性能。压力传感器也安装在罐中以测量系统内的压力。获得的结果表明，当全球太阳辐射强度达到1109.5W / m〜2的值时，太阳能热系统在每天在大约120kPa的压力下产生高达105°C的低温蒸汽。还通过12mm直径的恒定孔记录热虹吸质量流量高达0.042kg / s。接收器的瞬时效率达到46.48％。

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