高效热交换器小温差换热过程热量不平衡问题分析  

Analysis of heat imbalance in little temperature difference heat exchange process of high efficiency heat exchanger

作　　者：刘孝根 于改革 马金平 霍中雪 姚志燕 Liu Xiaogen;Yu Gaige;Ma Jinping;Huo Zhongxue;Yao Zhiyan(Hefei General Machinery Research Institute;Hefei General Machinery&Electrical Products Inspection Institute)

机构地区：[1]合肥通用机械研究院有限公司 [2]合肥通用机电产品检测院有限公司

出　　处：《制冷与空调》2022年第1期11-14,62,共5页Refrigeration and Air-Conditioning

基　　金：国家重点研发计划课题“典型间壁式热交换设备能效评价关键技术研究(2017YFF0209802)”;安徽省重点研究和开发计划项目(201904a05020050);中国机械工业集团2017年度重大科技专项计划项目(国机科[2017]456号)。

摘　　要：针对高效热交换器小温差换热过程进行了试验,结果表明:小温差换热过程冷、热侧热流量存在不平衡问题,冷、热侧热平衡误差随冷侧流体温升值和热侧流体的温降值的减小而增大。经分析发现,引起小温差换热过程热量不平衡的主要原因是随冷侧流体温升值和热侧流体的温降值的减小,温度测量仪表精度误差占比增大,导致热平衡误差增大。因此,建议测试标准GB/T 27698.1增加温度测量仪表相对于热交换器流体进出口温差的精度要求。Experiments were performed in the small-temperature difference heat exchanging process of high-efficiency heat exchangers.The experimental results show that there is an imbalance between the cold and hot side heat fluxes during the small-temperature difference heat exchanging process.The heat balance error increases with the decrease of the temperature rise of the cold-side fluid and the temperature drop of the hot-side fluid.According to the analysis of the test results,it is found that the main reason for the heat imbalance in the small-temperature difference heat exchanging process is that with the decrease of the temperature rise value of the cold side fluid and the temperature drop value of the hot side fluid,the error of the temperature instrument causes the thermal balance error to increase,therefore,it is recommended that the test standard GB/T 27698.1 should increase the accuracy requirements of the temperature measuring instrument relative to the temperature difference between the inlet and outlet of the heat exchanger fluid.

关 键 词：热交换器 小温差 热量平衡 热平衡误差 

分 类 号：F83[经济管理—金融学]