超市制冷系统中翅片管冷凝器控制策略的优化研究.pdfVIP

文章编号：CAR251 超市制冷系统中翅片管冷凝器控制策略的优化 冯永斌 晏刚 钱文波 张敏 （西安交通大学能源与动力工程学院，西安710049 ） 摘 要 通过建立翅片管冷凝器分布参数模型, 且对模型进行了实验验证，进而利用该模型对 R22 、R404A 、R507A 和 R290 在超市制冷系统的应用进行了研究。基于 R22 传统排气压力浮动控制策略，分析了不同制冷剂在翅片管冷凝器中的流动和 换热性能，优化了不同制冷剂在一定冷凝器负荷下的控制策略。研究表明：在现行 R22 排气压力浮动控制策略系统中，R290 冷凝器循环质量流量较 R22 小 48%左右，压降较 R22 小 45%左右。在满足冷凝器换热量的要求下,R290 在协调压降与质量 流量具有一定的优势且满足现行工质替代理念,可以作为现有超市制冷系统的环保型替代工质。 关键词 翅片管冷凝器 控制策略 R404A R507A 丙烷 Feng Yongbin Yan Gang Qian Wenbo Zhang Min (School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, China) Abstract A distributed parameter model for finned-tube condenser has been developed in this paper. The model has been validated by comparing outputs from the model with test data, given in reference papers. Application of the model is concentrated on studying the supermarket refrigeration system using R22, R404A, R507A and R290 as refrigerants. The flow and heat transfer characteristics of finned-tube condenser are analyzed for the refrigerants based on conventional discharge pressure floating control strategies of R22 condenser. The control strategies are optimized for the refrigerants under constant condensing pressure. The results show that the mass flow rate and pressure drop of R290 is lower 40% and 45% around than that of R22 under present discharge pressure floating control systems of R22 condenser, respectively. When the heat flux of condenser is contented, the results demonstrate that R290 has the particular advantages in terms of harmonizing the pressure drop with the mass flow rate, and is also in line with the present ideas of alternative refrigerants, which can be used as environment friendly alternative refrigerant for present supermarket refrigeration system. Keywords Finned-tube condenser Contro