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首页> 外文期刊>Energy Conversion & Management >Solar-driven Joule cycle reciprocating Ericsson engines for small scale applications. From improper operation to high performance
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Solar-driven Joule cycle reciprocating Ericsson engines for small scale applications. From improper operation to high performance

机译：太阳能驱动的焦耳循环往复式爱立信发动机，用于小规模应用。从不当操作到高性能

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The paper focuses on a Joule cycle reciprocating Ericsson engine (JCREE) coupled with a solar parabolic trough collector (PTC). A small scale application located at mid Northern Hemisphere latitude (44 degrees 25"N) is considered. A new dynamic (time-dependent) model is developed and used to design the geometry and estimate the performance of the PTC-JCREE system under the most favorable weather conditions (i.e. summer day and clear sky). The paper brings two main contributions. First, specific constraints on the design parameters have been identified in order to avoid improper JCREE operation, such as gas under-compression in the compressor cylinder and gas over-compression and/or over-expansion in the expander cylinder. Second, increasing the work generated per day requires using a proper strategy to switch between different rotation speeds. Specific results are as follows. For the (reference) constant engine rotation speed 480 rpm, the output work per day is 39,270 kJ and the overall efficiency is 0.134. The output work decreases by increasing the rotation speed, since the operation interval during a day diminishes. A better operation strategy is to switch among three rotation speed values, namely 480, 540 and 600 rpm. In this case the output work is 40,322 kJ and the overall efficiency is 0.137. The performance improvement is quite small and the reference constant rotation speed 480 rpm may be a suitable choice, easier to use in practice. For both the constant and variable rotation speed strategies, the overall efficiency is almost constant along the effective operation time interval, which is from 8:46 to 15:15. (C) 2016 Elsevier Ltd. All rights reserved.
机译：本文重点研究了焦耳循环往复式爱立信发动机（JCREE）和太阳能抛物槽收集器（PTC）。考虑了北半球中纬度（44度25“ N）的一个小规模应用。开发了一种新的动态（随时间变化）模型，该模型用于设计几何形状并估计PTC-JCREE系统在最大温度下的性能。有利的天气条件（如夏日和晴朗的天空），本文有两个主要贡献：首先，确定了对设计参数的特定限制，以避免JCREE操作不当，例如压缩机气缸中的气体欠压和气体。第二，要增加每天产生的功，需要使用适当的策略来切换不同的转速，具体结果如下：对于（参考）恒定发动机转速480 rpm时，每天的输出功为39,270 kJ，总效率为0.134。由于白天的运行间隔变暗，因此通过提高转速降低了输出功。刺激。更好的操作策略是在三个转速值（即480、540和600 rpm）之间切换。在这种情况下，输出功为40,322 kJ，总效率为0.137。性能提升非常小，参考恒定转速480 rpm可能是合适的选择，在实践中更易于使用。对于恒定和可变转速策略，在有效操作时间间隔（从8:46到15:15）上，总效率几乎是恒定的。 （C）2016 Elsevier Ltd.保留所有权利。

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