空气源热泵冷热水机组空气侧换热器结霜模型  

Modeling and analyzing of airside heat exchanger under frosting in air source heat pump water chiller/heater

作　　者：姚杨[1] 马最良 

机构地区：[1]哈尔滨工业大学市政环境工程学院,黑龙江哈尔滨150090

出　　处：《哈尔滨工业大学学报》2003年第7期781-783,共3页Journal of Harbin Institute of Technology

基　　金：国家自然科学基金(50278021)

摘　　要：采用分布参数法建立了空气源热泵冷热水机组空气侧换热器结霜的稳态模型,并将换热模型和结霜特性相结合,对该模型进行了求解,对机组在不同工况下运行时的结霜情况进行了分析,得到了影响结霜的主要因素。指出随着空气相对湿度的增加,结霜量明显增加;且在空气流动方向的不同管排间结霜量不同,为改善机组结构,提高机组性能提供了依据。When an air source heat pump water heater/chiller operates under low ambient temperature as a heating source in winter, the formation of frost on the surface of its airside heat exchanger easily leads to the degradation of heating capacity or even the shutdown of a unit. In order to solve the problem, a model of airside heat exchanger under frosting in an ASHPWHC is developed and its operating characteristics are analyzed to improve its reliability. The distributed parameters modeling was used to develop the steady mathematical model, which concerns the characteristics of heat exchange and performance of frosting. According to the solution of the model developed, the frosting under different operating conditions was analyzed and the main factors which have impact on frosting were obtained. The results indicate that the frosting accumulation obviously increases with the increase of relative humidity and varies with different rows of pipes along the direction of airflow. It proves that the model and analyzing results are very useful to optimize the structural layout and improve the operating performance of ASHPWHC units.

关 键 词：换热器 结霜模型 空气源热泵冷热水机组 分布参数法 湿度 制冷剂 空隙率模型 

分 类 号：TB657.5[一般工业技术—制冷工程]