基于分布参数模型的小管径换热器性能预测及参数分析  

Performance Prediction and Parametric Analysis of Small Diameter Heat Exchangers Based on Distributed Parameter Model

作　　者：李金波 赵夫峰 李日新 杜顺开 支长双 刘迎文[1] Li Jinbo;Zhao Fufeng;Li Rixin;Du Shunkai;Zhi Changshuang;Liu Yingwen(School of Energy and Power Engineering,Xi′an Jiaotong University,Xi′an,710049,China;Guangdong Midea Refrigeration Equipment Co.,Ltd.,Foshan,528311,China)

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]广东美的制冷设备有限公司,佛山528311

出　　处：《制冷学报》2023年第5期59-69,共11页Journal of Refrigeration

基　　金：国家自然科学基金(52006164,52276019)资助项目;美的制冷设备有限公司资金资助。

摘　　要：基于分布参数三维模型建立了分体式家用空调室内机小管径换热器的仿真模型,得到了总传热量、显热量、潜热量、制冷剂侧压降以及空气侧压降等参数。研究了管长、制冷剂流量、风量、空气入口温度及空气入口相对湿度在不同工况下对换热器性能的影响,结果表明:针对本文研究的5 mm管径换热器,性能最优时对应的管长区间为0.6~0.7 m,不仅可以保证较大的传热量,同时使得压降处于较低水平。由于传热系数与有效传质时间的综合影响,当风量处于600~700 m^(3)/h区间时,制冷工况下的潜热量达到极大值426 W。随着空气入口温度的升高,制冷工况下的显热量也会出现先增大后减小的趋势。Based on a three-dimensional distributed parameter model,a simulation model of a small-diameter heat exchanger in the indoor unit of a split-household air-conditioner was established,and the performance metrics were computed,including the total heat load,sensible heat load,latent heat load,refrigerant-side pressure drop,and air-side pressure drop.The effects of the tube length,refrigerant mass flow rate,air volumetric flow rate,air inlet temperature,and air inlet relative humidity on the heat exchanger performance metrics were determined under different working conditions.For the 5 mm diameter heat exchanger considered in this study,the corresponding tube length range was 0.6~0.7 m,achieving good heat transfer with a small pressure drop.Owing to the comprehensive influence of the heat transfer coefficient and the effective mass transfer time,when the volumetric flow of air was in the range of 600-700 m^(3)/h,the latent heat load reached a maximum of 426 W.With an increase in the air inlet temperature,the sensible heat load first increased and then decreased.

关 键 词：小管径换热器 分布参数模型 传热量 压降 

分 类 号：TB611[一般工业技术—制冷工程] TK172[动力工程及工程热物理—热能工程]