适用于不同农产品贮藏的CO_(2)多温区复叠制冷系统性能分析  

Performance analysis of CO_(2) multi-temperature zone cascade refrigeration system for the storage of different agricultural products

作　　者：何庆 杨俊玲[2] 王有栋 张海伦 章学来[1] 张振涛[2] 李晓琼 HE Qing;YANG Junling;WANG Youdong;ZHANG Hailun;ZHANG Xuelai;ZHANG Zhentao;LI Xiaoqiong(Department of Merchant Marine College,Shanghai Maritime University,Shanghai,201306,China;Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;College of Mechanical Engineering,Tianjin University of Science and Technology,Tianjin 300222,China)

机构地区：[1]上海海事大学商船学院,上海201306 [2]中国科学院理化技术研究所,北京100190 [3]天津科技大学机械工程学院,天津300222

出　　处：《农业工程学报》2023年第6期247-258,共12页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家重点研发计划项目(2018YFD0401305)。

摘　　要：为评估多温区制冷系统性能,探究其在农产品冷库贮藏中应用的可行性,设计了低碳环保型多温区复叠制冷系统。该研究以CO_(2)双温区与三温区复叠制冷系统为研究对象,通过设置压力调节阀(简称节流系统)和增压压缩机(简称增压系统)解决不同并联温区间的压差问题,建立两类制冷系统的热力学模型,分析了双温区和三温区复叠制冷系统运行参数对其性能系数(coefficient of performance,COP)与?效率的影响,并在参考工况下对双温区和三温区复叠制冷系统的两种运行模式进行了对比。结果表明:增压系统性能系数与?效率均高于节流系统,参考工况下双温区与三温区增压系统相对于节流系统性能系数分别提升30.4%和23.4%;双温区与三温区复叠制冷系统各部件中,冷凝器具有最大的?损,采用压力调节阀给节流系统带来了更大的能量损失;同工况下,该研究所设计的双温区和三温区增压系统性能系数是CO_(2)/R134a单温区复叠系统的1.5和2.3倍;经济性对比发现,双温区与三温区复叠制冷循环增压系统年度总成本比节流系统分别节省6554和8156美元。因此,多温区增压系统在热力性能与经济性上均优于节流系统,研究结果可为CO_(2)多温区复叠制冷系统的开发与应用提供理论基础。Low-carbon refrigeration is a promising trend in cold chain logistics under carbon peaking and carbon neutrality.Among them,CO_(2) refrigeration has offered broad application prospects in freezing and cold storage of agricultural products.In addition,the different agricultural products vary greatly in the temperature requirement of the storage.The single temperature zone in the current storage systems cannot fully meet the high-quality storage in the various agricultural products.Fortunately,the cascade refrigeration system can be expected to utilize in cold storage,due to the wide temperature range and high performance.Different temperature zones can be set in the high and low-temperature cycle of the cascade refrigeration system,in order to achieve accurate temperature control of materials,according to the storage characteristics of different agricultural products.In this study,the double-and three-temperature zones were applied to the cascade refrigeration system in cold storage.The natural CO_(2) was selected as the refrigerant in the low-temperature cycle,while the potential environment-friendly fluid R513A was used in the high-temperature cycle of the systems.The pressure difference was reduced in the different temperature zones,where a booster compressor(booster system for short)was set behind the evaporator with the low evaporation temperature,and a pressure regulating valve(throttling system for short)behind the evaporator with the high evaporation temperature.Furthermore,a thermodynamic model was established for the double-and three-temperature zone cascade refrigeration system,and then to carry out the energy and exergy analysis.A systematic investigation was made to clarify the effects of condensation temperature in the low and high-temperature cycle,temperature difference of cascade heat transfer on the coefficient of performance(COP)and exergy efficiency(ηe)of cascade refrigeration systems.The COP and exergy efficiency of the multi-temperature zone refrigeration system decreased both in the booster

关 键 词：农产品 贮藏 CO_(2)多温区复叠制冷 节流系统 增压系统 热力性能 经济分析 

分 类 号：S218[农业科学—农业机械化工程]