太阳能喷射式制冷系统运行特性的研究

Operating Characteristic Study of Solar Ejector Refrigeration System

针对目前太阳能喷射式制冷系统在运行时,热源驱动受太阳能辐射波动的影响较大,系统在运行过程中存在工况不稳定的缺点,以电加热为辅助热源的太阳能喷射式制冷实验台为对象,研究了系统的运行特性。系统调试过程中,采用电加热调节热水进出口温度改变发生温度,调节节流阀开度改变蒸发温度。实验结果表明:由于喷射器固有结构的限制,随着发生温度的升高,喷射系数E_(ER)、系统性能系数C_(COP)与机械性能系数C'_(COP)并非一直增大,系统存在一个最佳的发生温度;控制发生温度在85℃时,随着蒸发温度的升高,喷射系数E_(ER)、系统性能系数C_(COP)与机械性能系数C'_(COP)也逐渐增大,但增大的幅度逐渐变小。通过实验得出了系统最佳工作工况,为维持系统高效可靠的运行提供了方法。

Aiming at the weakness that solar ejector refrigeration system is greatly affected by solar fluctuation and has defect of unstable operating condition in operation, the solar ejector refrigeration experiment table with electric heating as auxiliary heat source was taken as the research object to study operating characteristics of the system. In the process of the system debugging, electric heating was used to control hot water inlet and outlet temperature to change the generating temperature, and to control opening of the throttle valve to change the evaporation temperature. Experimental results showed because of the ejector nature structure limit, the ejection coefficient EER, system coefficient of performance and mechanical C＇coe were not always increasing with the increase of the generating temperature, the system had an optimum generating temperature. When generating temperature was 85 ℃, the ejection coefficient EER, system coefficient of performance and mechanical C＇COP would increase with the evaporation temperature increase, but the increasing amplitude gradually became smaller. The best working condition presented in this paper provided an appropriate way to keep the system in efficient and reliable operation.