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机构地区:[1]合肥工业大学机械与汽车工程学院,安徽合肥230009
出 处:《合肥工业大学学报(自然科学版)》2015年第7期888-890,948,共4页Journal of Hefei University of Technology:Natural Science
摘 要:文章介绍了R134a/CO2复叠式制冷系统结构、原理,建立了复叠式系统性能计算的数学模型,研究了不同的CO2蒸发温度、R134a冷凝温度及冷凝蒸发器传热温差等循环参数变化对制冷系统性能的影响。分析显示,该复叠式制冷系统的性能系数COP随CO2蒸发温度的升高而增大,随R134a冷凝温度的升高及冷凝蒸发器传热温差增大而减小;结合研发环保型商业冷冻冷藏设备的需求,探寻在设定的应用条件下,制冷系统循环参数的变化关系及最优匹配,研究得到CO2冷凝温度为-3℃,高、低温级质量流量比为2.2,系统性能最优。The principle and structure of R134a/CO2 cascade refrigeration cycle system were described. The mathematical model of cascade cycle system was established, which was used in performance com- putation. The effect of the change of cycle parameters including CO2 evaporating temperature, R134a condensing temperature and temperature difference of the cascade heat exchanger on the coefficient of performance(COP) of cascade cycle system was analyzed. The result shows that the COP of the cas- cade system increases with the increase of CO2 evaporating temperature, and reduces with the increase of R134a condensing temperature and temperature difference of cascade heat exchanger. In view of the requirement of current environmental protection type commercial refrigeration equipment, the change relationship and the optimal matching of the cycle parameters of the cascade cycle system were ex- plored under the given condition. It is found that the optimal CO2 Condensing temperature is -3 ℃ and the best mass flow ratio is 2.2 uncler the given condition.
分 类 号:TB657[一般工业技术—制冷工程]
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