太阳能喷射式制冷系统的仿真

【作者】 李自强；

【导师】 沈胜强；

【作者基本信息】 大连理工大学 ， 热能与动力工程， 2003， 硕士

【摘要】 随着人们生活水平的提高，空调的使用日益广泛。与此同时，大量使用机械压缩制冷系统带来电能消耗、环境污染问题也向人类可持续发展提出了挑战。利用太阳能等可再生资源来满足人们需求是众多可供选择方案中最直接的解决方法。太阳能喷射式制冷系统，在充分利用太阳能的同时，本身结构简单，运行稳定可靠，因此在国内外得到了较多的关注。 本文对太阳能喷射式制冷系统进行了热力学分析，明确了系统性能变化的一般理论性规律，确定影响制冷系统性能变化的主要运行参数：采用热动力学的方法，描述了系统参数间的耦合关系，给出每个部件的信号图以及系统的耦合关系图。在此基础上，对太阳能喷射式制冷系统的进行仿真计算。基于本文系统仿真研究的目的和要求，选择了稳态仿真的方法。考虑各部件在系统中承担的作用和特点的不同，分别对各部件采用集中和分布参数模型。在算法的设计上，利用了当前制冷装置仿真用的几种实用方法，能够比较快速、准确完成迭代收敛计算。 仿真模拟了随太阳辐射强度变化喷射式制冷系统的运行性能。结果表明，在发生温度为69.1℃，系统性能系数相对偏低；在发生温度提高到78.7℃，系统性能系数能提高近2倍。此外，还模拟研究了系统的一些运行参数，包括发生温度、蒸发器冷风风量和风温等，对制冷系统性能的影响关系。更多还原

【Abstract】 With the improvement of the standard of living, air-conditioner has been more and more popularized. At the same time, mechanical compression refrigerators consume a big quantity of electric power and indirectly make the pollution problem more severe, which bring forward great challenge to the human’s sustainable development Among the various solutions the utilization of solar energy and other regenerative energy for refrigeration is one of the promising choices. The solar ejector refrigerant system, at the same time when it makes full use of solar energy, because of its simple structure and stable, reliable operation, has gained much attention.In this paper, first the thermodynamic analysis of refrigeration system has been carried out to get the universal order and the key operation parameters influencing the performance of refrigerant system. The dynamics analysis of refrigeration system is used to describe the coupling relationship among refrigerant system parameters and provide the parts signal diagram and system coupling diagram. On the basis of the analysis, we have simulated the solar ejector refrigeration system. Due to system simulation’s request, the steady-state simulation is used for the system. In the view of the different duty of parts in the solar ejector refrigeration system, we have set up distributed model or centralized model for different parts. In the aspect of simulation arithmetic, some practical plans of refrigeration system simulation are used to promptly and accurately make arithmetic convergence.A simulation model is set up to study the performance characteristics of ejector refrigeration system varying with the solar radiation. The simulation result show the low system COP at 69.1C of generation temperature but almost double system COP at 78.7C of generation temperature. It also studies the influence relationship between system performance and operation parameters including generation temperature, the air temperature of evaporator and so on.更多还原