Abstract This paper investigates a solar driven external combustion and regenerative engine, which can be used for desalination of seawater by using gaseous working fluids. The effect of operating and design parameters on engine performance for different suction ( P c ) and discharge ( P h ) pumping pressures, hot ( T h ) and cold ( T c ) space temperatures, regenerator effectiveness ( e R ) , displacer full stroke length ( X 0 ) and dead volume of hot ( X ho ) and cold ( X c 0 ) spaces is studied in detail. Optimization of pumping discharge pressure based on energy and exergy performance for six different working fluids is simulated. The energetic and exergetic analysis is performed at steady state conditions for the proposed thermodynamic cycle. Predominantly, mass and energy balance equations are applied to optimize the effect of different operating ( T h , T c , P c , P h ) and design ( e R , X h 0 , X c 0 , X 0 ) parameters on the output work and efficiencies. An open source SCILAB code is utilized to solve the derived equations for pressure, volume, temperature, mass, and heat loads. The simulation results provide profiles for energy efficiency, exergy efficiency, and optimization based on selected design and operating parameters. Obtained results show that for each charging pressure and hot space temperature, there is a different optimum discharge pressure and optimum hot temperature based on exergetic and energetic efficiency values. Besides, the net hydraulic work-output rises with the increase in the charged mass and displacer full stroke length. Simulation and thermodynamic analysis of proposed engine can be useful to design and select the optimum pumping heads for an accessible heat source and sink temperatures used for desalination to reduce the electricity consumption.

中文翻译：

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用于海水淡化的太阳能热动力 Encontech 发动机的数学建模、仿真和优化

摘要 本文研究了一种太阳能驱动的外燃蓄热式发动机，该发动机可用于利用气态工质对海水进行淡化。在不同的吸入 (P c ) 和排出 (P h ) 泵压、热 ( T h ) 和冷 ( T c ) 空间温度、蓄热器效率 ( e R ) 和置换器全冲程下，运行和设计参数对发动机性能的影响详细研究了热空间的长度 ( X 0 ) 和死体积 ( X ho ) 和冷空间 ( X c 0 )。模拟了基于能量和火用性能的六种不同工作流体的泵送排放压力优化。能量和火用分析是在稳态条件下针对所提出的热力学循环进行的。主要是，应用质量和​​能量平衡方程来优化不同操作（T h , T c , P c , P h ）和设计（ e R , X h 0 , X c 0 , X 0 ）参数对输出功和效率。开源 SCILAB 代码用于求解压力、体积、温度、质量和热负荷的派生方程。仿真结果提供了能源效率、火用效率和基于选定设计和运行参数的优化的概况。获得的结果表明，对于每个增压压力和热空间温度，基于火用和能量效率值，存在不同的最佳放电压力和最佳热温度。此外，净液压功输出随着加载质量和置换器全行程长度的增加而增加。