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我国攻克中央空调多联机世界性难题 实现效能大幅提升

2017-09-29 00:17:51   

央广网珠海9月28日消息(记者何伟奇)9月27日,经由中国工程院院士江亿、中国科学院院士何雅玲、空军工程设计局研究院罗继杰、合肥通用机电产品检测院院长李江等十几位权威专家组成的科技成果评估小组在广东珠海一致认定,“基于大小容积切换压缩机技术的高效家用多联机”产品为国际首创、达到“国际领先”水平;“面向多联机的CAN+通讯技术研究及应用”达到了“国际领先”水平,一致同意这两个项目通过科技成果评估。这也就意味着,我国成功攻克了中央空调多联机频繁停开机世界性难题,实现效能大幅提升,并在多联机通讯技术上取得新的突破。

中国制冷学会副秘书长荆华乾介绍,目前“多联机”成为越来越多家庭的选择,它美观不占地方,一台主机就可以覆盖多个房间。然而根据大数据研究发现,我国家用多联机晚上使用的时间比白天多,且单开1台室内机运行占到了总运行时间的60%,运行1-2台内机的时间占总运行时间的87%。也就是说,绝大多数时候多联机均处于低负荷条件下运行。

多联机负荷设计基于全屋热负荷,因此压缩机排量会较大,在单开1p室内机运行时因压缩机最小输出值大,非常容易到温度点停机,此时,多联机就会失去变频机所拥有的调节优势,将和定频机一样,不断开停机,致使房间温度波动大,导致压缩机效率低。  

清华大学教授石文星表示,中央空调多联机频繁停开机是世界性难题,如何在低负荷运行状态下提高家用多联机的能效?格力研究人员创新性地研发出一种基于大小容积切换技术的新型压缩机,该压缩机可以根据系统负荷情况从而选择运行模式。在低负荷运行模式时,仅小容积气缸运行,大容积气缸卸载,这时压缩机的最小输出值大幅降低,从而提高舒适性和能效。在高负荷运行模式时,两个气缸同时运行,满足大负荷需求。由于压缩机气缸容积可以改变,从而实现了低负荷下能效的提升以及最小输出值的下降。

此外,随着多联机在大型商场、楼宇、产业园等的应用日益增多,成百上千台机组的集中控制需求越来越多。传统的主从式通讯网络,一次控制很多机组的时候反应速度慢,控制不成功的问题突出,且机组数越多越明显。这次我国成功研发出“面向多联机的CAN+通讯技术研究及应用”,只需数秒,便可完成大型多联机系统上百个节点的地址自动分配,改变传统多联机通讯网络的“分钟级”时间限制,实现网络的自组网,免调试,维护简单,运行可靠的特点。

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