同时供冷供热双级压缩制冷热泵循环工质筛选

发布时间：2018-03-25 18:25

本文选题：热泵　切入点：自然工质　出处：《西安建筑科技大学》2014年硕士论文

【摘要】：人们在日常的生产及生活中，对制冷、供暖及生活热水的要求逐渐普遍化，这一部分能耗在整个建筑能耗中的比例也相应提高，所以一种更为高效节能的空调热泵系统就显得尤为重要。在实际应用中，目前现有的多功能热泵系统普遍存在着冷热量效率较低、功能不够完善、冷热量相互制约等问题，而本文所要研究的这种冷、热量可独立调节的同时供冷供热的双级压缩制冷热泵循环的系统形式就能较好地解决这一问题，本文将对这一系统形式进行制冷剂的筛选，为该系统形式日后的使用推广提供制冷剂选择的理论支持。通过对该双级压缩制冷热泵循环的研究，本文给出了该系统形式的热力计算方法，并运用REFPROP以及MATLAB两种软件进行编程模拟计算和对比分析。基于环保原则及自然工质良好的发展前景，本文选择NH3、R600、R c270、R600a及R290这五种自然工质作为制冷剂，对其在本文系统中的循环性能进行了理论计算，并对系统的性能系数、特征中间温度、高压压缩机排气温度以及容积比等性能参数进行对比分析。结果发现：制冷剂流量比、室外空气温度、生活热水出口水温、冷冻水出口水温是影响其性能的主要因素。在不同的侧重要求下，五种制冷剂的优劣顺序有所不同，实际选用时可参考本文结论。
[Abstract]:People in production and daily life, the refrigeration, heating and hot water requirements is more and more common, in the whole building energy consumption in the proportion of this part of the energy consumption also increased, so a more efficient energy-saving heat pump air-conditioning system is particularly important. In practical application, the multifunctional heat pump system the current cold heat efficiency is low, the function is not perfect, the problem of cold heat mutual control, this in this paper to study the cold and heat, independently adjustable heating and cooling the two-stage compression refrigeration cycle heat pump system forms can solve this problem better, this paper will carry out the screening of refrigerant in this system, to provide support for the theory of refrigerant selection system after application.
Based on the two-stage compression refrigeration and heat pump cycle research, this paper gives the calculation method of the thermal system, and simulation calculation and comparative analysis of the use of REFPROP and MATLAB two software. The prospects for the development of environmental protection principles and natural refrigerants based on good, this paper choose NH3, R600, R, c270, R600a and R290 these five kinds of natural refrigerant, the cycle performance in this system were calculated, and the coefficient of performance of the system, the middle temperature characteristics, comparative analysis of high pressure compressor exhaust temperature and volume ratio and other performance parameters. The results showed that the refrigerant flow ratio, outdoor air temperature, hot water outlet water temperature. The chilled water outlet temperature is the main factor affecting its performance. On the different requirements under the order of five refrigerants are different, the practical use of reference to the conclusion of this paper.

【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU83

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