太阳能辅助喷射-蒸气压缩混合制冷循环的性能分析

来源期刊:中南大学学报(自然科学版)2021年第6期

论文作者:刘晔 刘肖 鱼剑琳

文章页码:1837 - 1846

关键词:混合制冷循环;喷射器;循环性能;太阳能

Key words:hybrid refrigeration cycle; ejector; cycle performance; solar energy

摘    要:为了提高传统的单回路蒸气压缩制冷循环的性能,将常规的蒸气压缩制冷循环与太阳能驱动的喷射制冷循环相结合,提出一种新型太阳能辅助的混合喷射-蒸气压缩制冷循环。在该新型循环中,首先采用过冷器将喷射制冷循环与蒸气压缩制冷循环相结合,利用太阳能集热板收集太阳能,并利用太阳能驱动的喷射制冷循环增加蒸气压缩制冷循环的过冷度,通过增加循环的制冷量进而提高循环的综合性能;其次,建立热力学模型,利用REFPROP软件的数据库获取制冷剂物性参数并使用FORTRAN程序计算该新型循环性能;最后,研究蒸发温度等参数对循环性能的影响。研究结果表明:在设计工况范围内,混合制冷循环的性能系数和单位容积制冷量比常规的蒸气压缩制冷循环分别可提高10.4%和13.6%;混合制冷循环存在最佳中间温度,当中间温度为20 ℃时,循环性能系数达到最大值5.50;在设计工况范围内,喷射器的喷射系数和升压比最高可分别达到1.09和1.87;蒸发温度,冷凝温度与中间温度等循环参数均对喷射器的性能有非常显著的影响,降低蒸发温度和中间温度或者升高冷凝温度,均可以增大喷射器升压比,减小喷射系数。

Abstract: In order to improve the performance of conventional single-loop vapor compression refrigeration cycle(VCRC), a novel solar-assisted hybrid ejector-vapor compression refrigeration cycle(ECRC) was proposed which combined with conventional VCRC and solar-driven ejector refrigeration. Firstly, a subcooler was applied to combine ejector cycle and VCRC in ECRC. Solar panels was utilized to collect solar energy, and then solar-driven ejector cycle was utilized to increase subcooling degree of main refrigeration cycle. As a result, the performance of ECRC was improved by increasing the refrigeration capacity. Secondly, a thermodynamic model was established for the ECRC. The physical property parameters of refrigerant were obtained by the database of REFPROP software and the performance of ECRC was calculated by FORTRAN program. Finally, the influence of evaporation temperature and other parameters on cycle performance was studied. The results show that compared with VCRC, the coefficient of performance(COP) and the volumetric refrigeration capacity of ECRC increases by 10.4% and 13.6% in the proposed operating conditions, respectively. There is an optimal intermediate temperature and COP of ECRC reaches the maximum of 5.50 when the intermediate temperature is 20 ℃. In the proposed operating conditions, the entrainment ratio and pressure lift ratio can reach the maximum value of 1.09 and 1.87, respectively. Evaporation temperature, condensation temperature and intermediate temperature have a significant impact on the performance of the ejector. Reducing evaporation temperature and intermediate temperature or increasing condensation temperature can increase pressure lift ratio and reduce entrainment ratio of ejector.

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