基于环保冷媒的水源热泵机组性能研究
发布时间：2018-10-24 20:14
【摘要】：传统制冷剂R22不仅对臭氧层存在破坏力而且还会加剧温室效应,各国正遵照《蒙特利尔议定书》及相关法案,在2020-2030年间逐步完全淘汰传统制冷剂,因此研究新一代零ODP和低GWP的替代制冷剂已是迫在睫,势在必行。在高效节能、高需求量的热泵行业,目前尚未有一种在环境性、热物性、安全性等方面兼顾可实现良好替代的新型制冷剂,而本文的目的正是寻找一种具有自主知识产权,在该领域可完全长期替代的新型混合制冷剂。本文在环境友好性、热物性、安全性、互溶性、经济性方面提出了替代原则和目标,依照此目标,寻找了 R1234ze(E)、R32及R134a三种优势互补的组元,在理论上对其混合物的环境及热工性能等进行计算分析,筛选出较优组合配比的NC001即R32/R1234ze(E)/R134a(50/17/33)作为替代实验的主要研究对象。NC001的ODP为零,GWP值仅为R22的44%,C02减排率为48%,沸点、汽化潜热等基本物性与R22接近,同时滑移温度为5℃左右,无毒不可燃,作为非共沸制冷剂适宜直接替代。实验中对于R22、R32、R1234ze(E)、NC001四种制冷剂在水源热泵机组上进行直接充灌,蒸发器/冷凝器侧分别以4/5、5/6、6/7m3/h的不同流量以及有无回热器情况下进行循环性能测试。通过实验发现,新型混合制冷剂NC001的制热量比R22高10-22%,压比等热物性及循环性均接近于R22。当第二循环进水侧温度在12-23℃时,COP略低于R22约0-14%,当温度超过23℃时,NC001的COP高于R22。同时实验还发现,夏季开启回热器、冬季关闭回热器对于提高制热量有利,而第二循环水流量大小对于NC001的影响并不大。新型混合替代制冷剂NC001基本满足替代目标和原则,认为可在水源热泵领域具有替代优势,有必要进行进一步深入研究,以提高系统的性能系数,进一步减少对环境的影响。
[Abstract]:The traditional refrigerant R22 is not only destructive to the ozone layer but also exacerbates Greenhouse Effect, and countries are phasing out traditional refrigerants completely between 2020-2030, in compliance with the Montreal Protocol and related legislation. Therefore, it is imperative to study the new generation of zero ODP and low GWP alternative refrigerants. In the heat pump industry of high efficiency and energy saving and high demand, there is not yet a new refrigerant which can be replaced well in the aspects of environment, thermal properties and safety. The purpose of this paper is to find a new refrigerant with independent intellectual property. A new type of mixed refrigerant that can be completely substituted for long-term in this field. In this paper, the principles and objectives of substitution are put forward in the aspects of environmental friendliness, thermal property, safety, mutual solubility and economy. According to this goal, three complementary components of R1234ze (E), R32 and R134a are found. The environment and thermal performance of the mixture were calculated and analyzed theoretically, and the NC001 with the best combination ratio, R32/R1234ze (E) / R134a (50-17-33), was selected as the main research object in the substitution experiment. The ODP of NC001 was zero, and the value of GWP was only 44% C02 of R22. The basic physical properties of latent heat of vaporization are close to that of R22, and the slip temperature is about 5 鈩，
本文编号：2292433
[Abstract]:The traditional refrigerant R22 is not only destructive to the ozone layer but also exacerbates Greenhouse Effect, and countries are phasing out traditional refrigerants completely between 2020-2030, in compliance with the Montreal Protocol and related legislation. Therefore, it is imperative to study the new generation of zero ODP and low GWP alternative refrigerants. In the heat pump industry of high efficiency and energy saving and high demand, there is not yet a new refrigerant which can be replaced well in the aspects of environment, thermal properties and safety. The purpose of this paper is to find a new refrigerant with independent intellectual property. A new type of mixed refrigerant that can be completely substituted for long-term in this field. In this paper, the principles and objectives of substitution are put forward in the aspects of environmental friendliness, thermal property, safety, mutual solubility and economy. According to this goal, three complementary components of R1234ze (E), R32 and R134a are found. The environment and thermal performance of the mixture were calculated and analyzed theoretically, and the NC001 with the best combination ratio, R32/R1234ze (E) / R134a (50-17-33), was selected as the main research object in the substitution experiment. The ODP of NC001 was zero, and the value of GWP was only 44% C02 of R22. The basic physical properties of latent heat of vaporization are close to that of R22, and the slip temperature is about 5 鈩，
本文编号：2292433
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