Experimental study on thermal resistance of fouling in heat exchangers of sewage source heat pumps  

作　　者：吴学慧 魏巧兰 孙德兴 

机构地区：[1]School of Municipal and Environmental Engineering,Harbin Institute of Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2010年第2期204-208,共5页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Natural Science Foundation of China(Grant No. 50578048)

摘　　要：To investigate the formation of fouling in sewage heat exchangers, a model of thermal resistance with time is developed based on the experiments in a practical engineering site. And this model is asymptotic exponential function. According to the characteristic of sewage heat exchangers, the effective thermal resistance and effective coefficient of heat transmission during the formation of fouling are defined. A model for pressure loss of fouling of asymptotic distribution is presented based on the model of thermal resistance of fouling. And the maximum absolute margin of error of the fouling thermal resistance is smaller than the typical allowable error range. The maximum relative error of the heat transfer coefficient is 12%. These can meet the requirements of engineering. The resuhs of experiments provide a basis for further study and application of swage heat exchangers.To investigate the formation of fouling in sewage heat exchangers,a model of thermal resistance with time is developed based on the experiments in a practical engineering site. And this model is asymptotic exponential function. According to the characteristic of sewage heat exchangers,the effective thermal resistance and effective coefficient of heat transmission during the formation of fouling are defined. A model for pressure loss of fouling of asymptotic distribution is presented based on the model of thermal resistance of fouling. And the maximum absolute margin of error of the fouling thermal resistance is smaller than the typical allowable error range. The maximum relative error of the heat transfer coefficient is 12% . These can meet the requirements of engineering. The results of experiments provide a basis for further study and application of swage heat exchangers.

关 键 词：swage heat exchangers FOULING MODEL exDeriments 

分 类 号：TU99[建筑科学—市政工程]