两种回热型NH_3-H_2O-LiBr吸收式制冷机的实验研究  

Experimental Research on two kinds of NH_3-H_2O-LiBr Absorption Chillers with Heat-regenerators

作　　者：刘科伟[1] 吴裕远[1] 王永涛[1] 胡凤姣[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《制冷学报》2011年第1期7-11,共5页Journal of Refrigeration

基　　金：国家自然科学基金项目(50776064)~~

摘　　要：为了提高无回热器氨-水-溴化锂吸收式制冷实验样机的性能,实验首次提出了单回热器型和双回热器型氨-水-溴化锂吸收式制冷机的概念,并对两种实验样机分别进行了实验研究。实验结果表明,对于单回热器系统,溴化锂的加入大大降低了发生过程中的发生压力,对系统的安全性有利。但是由于吸收器和回热器的直接连通,导致回热器温度高于35℃时,随着回热温度的上升,吸收器压力急剧升高,制冷效果恶化。对于双回热器系统,结构的改进有效地解决了单回热器系统存在的问题,很好地实现了回热功能。相比于无回热器氨-水-溴化锂吸收式制冷实验样机,制冷系数得到明显的提高。在氨质量分数为50%,溴化锂质量分数为15%的情况下,系统的性能系数从无回热器的0.276提高到0.457,增幅达65.35%。In order to improve the performance of the prototype NH3-H2O-LiBr absorption chiller without heat regenerators,the concept of this kind of refrigeration system with single or double regenerators was firstly proposed,and the corresponding experiments of the two prototypes were carried out respectively.The experiments indicated that pressure in the generator could be significantly reduced during the process of generation after adding lithium bromide to the system for the single regenerator system,so the system safety can be improved.However,due to the direct connection between the regenerator and the absorber,the pressure in the absorber increased sharply with the continual increase of the regenerator temperature if the temperature of the regenerator reaches up to 35℃,which leads to refrigeration deterioration correspondingly.For the double regenerators system,problems existing in the single regenerator system could be solved effectively as a result of the structural improvement,and the regenerative capabilities could be truly fulfilled.Compared with the non-regenerative absorption system,the coefficient of performance（COP） was significantly improved.The COP of the system with double regenerators was increased from 0.276 to 0.457 with an improvement of 65.35% on condition that NH3 concentration was 50% and LiBr concentration was 15%.

关 键 词：热工学 吸收式制冷机 氨-水-溴化锂 回热器 性能系数 

分 类 号：TB651[一般工业技术—制冷工程] TB616