CO_2-[emim][Tf_2N]吸收-喷射冷热电联供系统中喷射器性能研究

Research of ejector performance in CO_2-[emim][Tf_2N] absorption- jet combined cooling heating and power system

为以CO_2为工质的喷射器在冷热电联产中的应用提供依据,文中首先对该系统核心部件喷射器进行性能分析。基于喷射器及CO_2-[emim][Tf_2N]本身的特性、系统的运行特征,在VC++的环境下,根据喷射器设计及性能计算公式进行编程,经理论计算得到,工作压力、蒸发温度、背压及引射流体质量流量对系统中喷射器喷射系数的影响规律。结果表明:与背压不同,在给定工况下,工作压力、蒸发温度、引射流体的流量的提高,对喷射系数分别提高39%、60%、78%。

For providing the basis for the application of the CO2 injector in the CO2 absorption - jet combined cooling heating and power system, this article firstly analyzed performanee of injector which was the core of the system. Based on the characteristics of the injector and the CO2-[emim][Tf2N] , combined with the feature of running of the system, under the enviromneut of Vc ＋ ＋ , according to calculation formula of the ejector design and performance, programming was designed. According to theoretical calculation, working pressure, evaporating temperature, back pressure for impact of the injection coefficient in change of working parameter were obtained. Results show that unlike back pressure, in the ease of given conditions, the increase of working pressure, evaporating temperature, entraining mass flow rate makes ejector coefficient increase by 39% , 60% and 39% respectively.