应用于空气源热泵系统的相变蓄热水箱数值模拟  

A numerical study on heat storage water tank containing phase change materials for air source heat pump systems

作　　者：李慧星[1] 曹炽洪 冯国会[1] 张然[1] 黄凯良[1] 

机构地区：[1]沈阳建筑大学市政与环境工程学院,辽宁沈阳110168

出　　处：《储能科学与技术》2016年第1期101-105,共5页Energy Storage Science and Technology

基　　金：国家"十二五"科技支撑项目(2014BAJ01B04-02)

摘　　要：构建空气源热泵-相变蓄热水箱供暖系统,通过相变储能技术的合理应用,优化了太阳能、空气热能等非连续能源的供能方式,有效提高了建筑中可再生能源的利用率。相变蓄热系统采用了6m^3的保温水箱作为蓄热容器,选取46#石蜡为主要相变材料,304#不锈钢管为封装材料。建立蓄热系统的三维数学模型,采用有效热熔法对相变材料的焓值进行处理,运用Fluent数值模拟软件,研究相变蓄热系统的蓄放热性能。模拟结果显示,系统的蓄热时间为9.2 h,理想蓄热量为102.4kW·h,能够单独提供低能耗建筑连续采暖11.1h。空气源热泵-相变蓄热水箱供暖系统能实现大跨度的间歇供暖,在利用非连续能源供暖领域具有良好的前景。A heat storage water tank containing phase change materials （PCMs） for an air source heat pump system is studied with an aim to optimize the heating system for non-continuous sources of energy, such as solar heat, and air and geothermal heat etc. The water tank has a volume of 6 m3, containing 686 kg of paraffin with a phase change temperature of 46.78℃, encapsulated within 304 stainless steel tubes. A real scale model was established and investigated numerically using a Fluent software package. The effective enthalpy method was used to deal with the phase change process. It was found that the storage system can store 102.4 kW.h of heat within 9.2 h and continuously heat a low energy building for 11.1 h, meeting the heat demand of the building at night. This illustrated that an air source heat pump, coupled with the heat storage tank containing the PCM could achieve a large span of intermittent heating.

关 键 词：相变储能 有效热熔法 供暖系统 数值模拟 

分 类 号：TK02[动力工程及工程热物理]