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                                                                                                                                                                      1. 首页 >> 新闻中心 >> 使用制冷循环冷水机要满足哪些要求

                                                                                                                                                                        使用制冷循环冷水机要满足哪些要求

                                                                                                                                                                      2. 发布日期:2021-04-21      浏览次数:373
                                                                                                                                                                        •  
                                                                                                                                                                            要想冷水机组能正常、安全的运行,可离不开制冷剂。它是在制冷循环冷水机制冷系统中循环以实现制冷的工作介质,也称为制冷工质或雪种。那么,不同制冷循环的冷水机对制冷剂有哪些共同性能要求呢?
                                                                                                                                                                            一、热力学性能方面
                                                                                                                                                                            1、要有适中的饱和蒸汽压力。蒸发压力一般不要低于大气压力,以免空气渗漏进入系统;冷凝压力也不宜过高,否则对系统耐压要求会提高,并且会使耗功增大;此外,冷凝压力与蒸发压力之比也不宜过高,否则会导致冷水机的压缩机排气温度升高。
                                                                                                                                                                            2、要有较高的临界温度(比环境温度高的较多),这样在常温或者普通低温下便可液化,且会减小节流损失。
                                                                                                                                                                            3、要有较低的凝固温度。这样可避免制冷剂在蒸发温度下凝固。
                                                                                                                                                                            4、要有较高的热导率。这样可以提高冷水机组(以螺杆式冷水机/风冷式冷水机/水冷式冷水机为例)换热器的换热系数,减小换热面积,从而降低制造及运行成本。
                                                                                                                                                                            5、要有较小的绝热指数。这样可以使压缩过程耗功较少,压缩机排气温度不至于过高。
                                                                                                                                                                            6、制冷剂液体比热容要小。这样可以减小节流过程损失。
                                                                                                                                                                            二、理化性能方面
                                                                                                                                                                            1、要有较小的密度和黏度,这样可以减小制冷剂在机组制冷系统中的流动阻力损失。
                                                                                                                                                                            2、要求不易燃烧、爆炸、无毒,并且在高温下不易分解,不易腐蚀冷水机组的金属部件。

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