摘要
R32作为一种环境友好型制冷剂,在家用空调、工商用制冷空调领域的应用越来越广泛,但R32的安全等级为A2L,具有弱可燃性,需要提高系统性能的同时,要减少R32充注量以提高制冷系统的安全性,其中小管径替代技术是减少其充注量的有效方法。为了预测R32制冷系统采用小管径对制冷剂充注量的影响,比较7种空泡系数模型对2个系统的制冷剂充注量,并基于准确度最高的模型联合其他关联式建立新模型,计算出管径减小后不同制冷量下对R32充注量的影响。结果表明:Hughmark模型的计算结果与最佳充注量最为接近,与2个系统的相对误差分别是27.2%和18.0%;通过新模型计算得出在制冷量为5、7.5、12.5 kW时,制冷系统管径由7 mm变成5 mm后,R32充注量分别减少33.2%、32.0%和30.9%,为后续相关研究提供参考。
R32 is an environmentally friendly refrigerant that is increasingly used in the fields of household air conditioning and commercial refrigeration air conditioning.However,due to its safety level of A2L and weak flammability,it is necessary to improve system performance while reducing the charging amount of R32 to enhance the safety of the refrigeration system.Among them,small-diameter substitution technology is an effective method to reduce its charging amount.In order to predict the effect of refrigerant charge on R32 refrigeration system with small-diameter tube,seven void fraction models were compared on the refrigerant charge of two systems.A new model was established based on the most accurate model combined with other correlation equations to calculate the effect of different refrigerant charges on R32 charge after reducing the tube diameter.The results show that the Hughmark model′s calculation results are closest to the optimal filling amount,with relative errors of 27.2%and 18.0%with the two systems,respectively.Through the new model calculation,it is found that when the cooling capacity is 5,7.5,12.5 kW,the charging amount of R32 decreases by 33.2%,32.0%and 30.9%,respectively,when the diameter of the refrigeration system is changed from 7mm to 5mm.This provides reference for subsequent related research.
作者
刘业凤
丁民淅
罗志鹏
钟海辉
李洁
张华
张天娇
LIU Yefeng;DING Minxi;LUO Zhipeng;ZHONG Haihui;LI Jie;ZHANG Hua;ZHANG Tianjiao(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《化学工程》
北大核心
2025年第7期43-47,共5页
Chemical Engineering(China)
基金
中央引导地方科技发展资金项目(YDZX20213100003002)
国家重点研发计划(2020YFF0303901)
国家自然基金资助项目(52406024)。
关键词
R32
小管径
充注量
空泡系数模型
数值模拟
R32
small-diameter tube
refrigerant charge
void fraction model
numerical simulation
