正压双源热泵热水器建模及其蒸发器结构优化研究  

Research on modeling of positive pressure dual-source heat pump water heater and its evaporator structure optimization

作　　者：李蓉[1] 田琦[1] 李琦晟 李科宏 Li Rong;Tian Qi;Li Qisheng;Li Kehong(Department of Civil Enginering,Taiyuan University of Technology,Jinzhong 030600,China)

机构地区：[1]太原理工大学土木工程学院,山西晋中030600

出　　处：《可再生能源》2020年第10期1333-1342,共10页Renewable Energy Resources

基　　金：“十二五”国家科技支撑计划项目(2012BAJ04B02);基于喷射压缩制冷的太阳能光热空调新技术科技部国际合作项目(2013DFA61580)。

摘　　要：文章对负压双源集热蒸发器的结构进行改进,提出了新型正压双源集热蒸发器。在数值模拟过程中,将辐射换热修正引入常规空气源热泵蒸发器数学模型。此外,基于风速分布不均匀情况,引入流量自组织理论,建立适用于正压双源热泵热水器的数学模型。利用MATLAB软件编写程序,对正压双源热泵热水器的各项性能进行数值模拟,利用仿真模型对蒸发器长宽比进行优化。模拟结果表明:正压双源热泵热水器模型的计算值与实验值之间的误差约为5%,这表明该模型的模拟结果具有较高的精度;单排正压双源热泵热水器的制热性能优于双排负压双源热泵热水器;集热蒸发器的最佳长宽比为1.1,相比于优化前的正压双源热泵热水器,优化后的正压双源热泵热水器的年平均COP提高了10.4%。Negative pressure dual source ollector evaporator is structurally modified,and a new positive pressure dual source collector evaporator is proposed.Radiation heat transfer correction is introduced in the mathematical model of the conventional air source heat pump evaporator.In particular,considering the non-uniformity of wind speed distribution,the flow self-organization theory is introduced to establish a new mathematical model suitable for the positive pressure dual-source heat pump hot water heater.MATLAB was used to make simulation programs,to simulate the performance of the system.The simulation model is used to optimize the length-width ratio of the evaporator.The results show that the calculated value of the positive pressure dual-source heat pump water heater model is about 5%;which has higher precision.The single-row positive pressure dual-source heat pump water heater has better heating performance than the double-row negative pressure dual-source heat pump water heater.The optimum length-width ratio of the evaporator is 1.1.The optimized annual COP of the positive pressure dual-source heat pump water heater is 10.4%higher than that before optimization.

关 键 词：集热蒸发器 空气源热泵 MATLAB仿真 辐射换热修正 流量自组织理论 

分 类 号：TK515[动力工程及工程热物理—热能工程] TU833[建筑科学—供热、供燃气、通风及空调工程]