房间空调器小管径室外换热器流路优化  

Research on Circuit Optimization of Small-Diameter Outdoor Heat Exchanger for Room Air Conditioner

作　　者：马迪 谭裕锋 吕根贵 陈旗 吴红霞 晏刚[1] MA Di;TAN Yufeng;L Gengui;CHEN Qi;WU Hongxia;YAN Gang(School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China;Hisense(Guangdong)Air Conditioning Co.,Ltd.,Jiangmen,Guangdong 529000,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]海信(广东)空调有限公司,广东江门529000

出　　处：《西安交通大学学报》2024年第5期179-189,共11页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目(52006165)。

摘　　要：随着空调器的快速发展和国际铜价的持续升高,制冷空调行业采用的换热器在向着小体积、低成本发展的过程中往往面临着性能衰减的技术瓶颈。为突破此瓶颈,以一款冷暖型房间空调器翅片管式室外换热器为研究对象,将其换热管外径由7 mm减小至5 mm并在此基础上优化其流路,最终实现Φ5 mm换热器性能达到初始样机水平并有效降低换热器成本。首先,分别在5种标准工况下测试初始样机性能;然后,利用CoilDesigner软件来分析小管径化对换热器性能的影响,仿真结果表明,在不改变流路布置的情况下,Φ5 mm换热器的换热能力略有提升,但制冷剂侧压降增大4~7倍;进一步地,有针对性地设计了5种流路布置方案来探究分路数、分路汇合位置等因素对换热器传热及压降特性的影响规律,总结了小管径翅片管式换热器流路优化的思路,并设计了3种Φ5 mm管径室外换热器流路优化方案。仿真评估3种方案的可行性后制作样机进行性能测试,实验结果表明:方案(3)性能与原换热器相当,同时其材料成本可降低34.6%。With rapid advancements in air conditioners and increasing international copper prices,the heat exchangers used in the refrigeration and air conditioning industry frequently face technical challenges that hinder performance degradation as efforts focus on compact size and cost efficiency.In response,a study is conducted on a dual-mode room air conditioner with a finned-tube outdoor heat exchanger.The outer diameter of the heat exchange tubes is reduced from 7 mm to 5 mm alongside the circuit optimization.The goal is to achieve the performance of theΦ5 mm heat exchanger at the level of the initial prototype and effectively reduce the cost of the heat exchanger.Firstly,the performance test of the original prototype is carried out across five standard operating conditions.Subsequently,CoilDesigner is utilized to assess the impact of tube diameter reduction on the heat exchanger’s performance.Simulation results indicate a minor improvement in the heat transfer capacity of theΦ5 mm heat exchanger without any circuit alterations.However,the refrigerant pressure drop increases by 4—7 times.Furthermore,five targeted circuit schemes are designed to examine the impact of factors such as the number of circuits and confluence locations of circuits on the heat transfer and pressure drop characteristics of the heat exchanger.The study summarizes an optimization approach for the circuit of small-diameter finned-tube heat exchangers.Three optimization schemes are developed for theΦ5 mm outdoor heat exchanger.After simulating and evaluating the feasibility of these three schemes,prototypes are generated for performance testing.The experimental results reveal that scheme(3)performs on par with the original heat exchanger while concurrently reducing material costs by 34.6%.

关 键 词：房间空调器 翅片管式换热器 小管径 流路优化 

分 类 号：TB69[一般工业技术—制冷工程]