现如今，我国工业已经进入快速深入发展的历史进程中，节能减排已经成为我国现阶段的一个重要的改革方向。而高效率、低消耗、低成本已经成为制冷行业的一个风向标，所以在经过历史颠簸的过程后，氨水吸收式制冷系统将重新被人们认识，而在研究的过程当中，如何提高系统的热效率，成为现如今研究的热点，而在所有氨水吸收式制冷系统中，以GAX循环的效率最高。因此，本文将在前人对基本的GAX系统研究的基础上，提出一种新型GAX循环氨水吸收式制冷系统，并且对该系统进行理论的分析和仿真模拟研究，并对结果经行对比分析。

经过长期深入研究氨水吸收式制冷系统的种类有很多，但只有GAX循环系统的COP值是最高，借此本文深入分析了氨水GAX循环的吸收式制冷系统循环机理，以及国内外在这此系统上的研究程度。

新型GAX循环的理论分析，最重要的就是对该系统氨水制冷工质对的物理性质有最清楚了解，并且在系统计算时要经常用到物性参数，而在模型仿真模拟式可能要调用成千上万次，所以文章采用VC++开发编写了氨水溶液液相和气相的热物理性质、饱和氨液相和气相、过热蒸汽的热力参数的计算软件。

本文还同时采用VC++ 编程语言编制出新型GAX循环氨水吸收式制冷系统计算软件。可以计算不同工况下设备的参数，较便捷的进行查看对比分析研究。并且借助于大型的化工流程仿真模拟软件Aspen plus经行模拟实验，可以得到比较直观仿真模拟数据，并与编程出的计算结果进行比较分析，来完善系统的不足。文章还对新型GAX循环系统的火用损失进行了计算，来分析系统有效能的使用状况。

关键词：新型GAX；氨水；吸收式制冷；VC++；Aspen Plus仿真；火用分析

Nowadays, the industry of our country has entered a state of fast development and energy-saving and emission reduction has become an important reform direction at present. High efficiency, low consumption and low cost have become the objective in the refrigeration industry. After a certain jolty period in history, aqua-ammonia absorption refrigerating systems were recognized. In the process of research, how to improve heat efficiency of the system was turned into a heated topic in the studies. Among all the NH₃-H₂O absorption refrigerating systems, the circulation of GAX was of the highest efficiency. On the basis of the former studies of the basic GAX system, a new type of GAX circulating NH₃-H₂O absorption refrigerating system was proposed and it was analyzed theoretically and analogue simulation studies were conducted.

Comparisons and analysis of the results were made. That had many kinds of NH₃-H₂O absorption refrigerating systems which had undergone thorough researches for long periods of time. But only the COP values of the GAX circulation system was the highest. In this paper, the circulation mechanism of NH₃-H₂O circulation absorption refrigerating system was analyzed and the latest research progress both at home and abroad had been discussed.

As for the theoretical analysis of GAX circulation, the most basic was to have a clear understanding of the physical property of refrigerant of the aqua-ammonia solutions in this system and the physical property parameters were often used in calculations in this system and might be used more than thousands of times in the model simulation analog. In all the papers, the computing software of the heat physical properties of the liquid phase and gas phase of NH₃-H₂O solution, the liquid phase and gas phase of saturated ammonia and thermal parameters of superheated steam were compiled with VC++.

In this paper, the computing software of the new type of GAX circulating aqua-ammonia absorption refrigerating system were compiled with VC++ to calculate the parameters of the facilities under different working conditions and examine easily so as to compare, analyze and study. By means of a large-scale chemical industry analogue simulation software Aspen plus to make simulation experiments to obtain comparatively perceptual intuition simulation data, which were compared with the results of the calculation of the compiled program to implement the system. The exergy loss of the new type of GAX circulation system was calculated to analyze the use of the useful energy of the new GAX system.

Key words: New GAX; NH₃-H₂O; absorption refrigeration; VC++;Aspen Plus simulation; exergy analysis