低能耗建筑地源热泵蓄热特征数值仿真  

Numerical Simulation of Heat Storage Characteristics of Ground Source Heat Pump in Low Energy Building

作　　者：张微 李红旗[2] ZHANG Wei;LI Hong-qi(Municipal and Environmental Engineering Institute,Jilin University of Architecture and Technology,Changchun Jilin 130114,China;College of Environmental and Energy Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]吉林建筑科技学院市政与环境工程学院,吉林长春130114 [2]北京工业大学能源与动力工程学院,北京100124

出　　处：《计算机仿真》2023年第6期370-374,共5页Computer Simulation

基　　金：2020年度吉林省教育厅科学研究规划项目(JJKH202012 43SK)。

摘　　要：为准确分析不同蓄热模式与工况下的蓄热特征,为低能耗建筑科学合理运用地源热泵系统提供依据,对低能耗建筑地源热泵的蓄热特征完成数值仿真。构建低能耗建筑的空气-地源热泵系统,并引以为例,构建空气换热器、U型地埋管与热泵机组数学模型,实现对该系统蓄热特征的数值仿真。仿真结果表明,在上述系统处于有蓄热工况下时,土壤温度较无蓄热工况时得到明显提升;U型地埋管周边土壤半径越低所获得的蓄热效果越好;U型地埋管深度不变时,蓄热时间越长,其耗电量与整体蓄热量越高,平均蓄热率与蓄热能效比越低;相同蓄热模式下蓄热时间不变时,U型地埋管的深度越高,整体蓄热量、蓄热能效比及平均蓄热率越高,耗电量不变,单位埋深蓄热率则越低;日平均蓄热率最高值与室外日平均温度最高值出现在同一日,且二者的变化趋势相同,不受其蓄热时间与U型地埋管深度所影响。In order to accurately analyze the heat storage characteristics in different heat storage modes and work-ing conditions,the paper provides a basis for the scientific and reasonable application of ground source heat pump in low-energy buildings,and a numerical simulation of heat storage characteristic of ground source heat pump in low-energy buildings was carried out.Firstly,an air-ground source heat pump system of low energy building was construc-ted and cited as examples.Secondly,a mathematical model of air heat exchanger,U-buried pipe and heat pump unit was constructed to realize the numerical simulation on the heat storage characteristic of system.Following conclusions can be drawn from simulation results:the soil temperature of the system in heat storage condition is significantly high-er than that of the system without heat storage;The lower the radius of soil around the U-buried pipe,the better the heat storage effect;When the depth of U-buried pipe keeps unchanged,the longer the time of heat storage,the higher the power consumption and the accumulation of heat capacity,and the lower the average heat storage ratio and energy storage efficiency;In the same heat storage mode and constant heat storage time,the deeper the U-buried pipe,the higher the accumulation of heat capacity,the energy efficiency ratio of heat storage and the average heat storage rate.If the power consumption remains unchanged,the per unit depth of heat storage rate will be lower.The highest daily average heat storage rate and the highest outdoor daily average temperature occur on the same day,and their trend of change is the same,which is not affected by the heat storage time and the depth of U-buried pipe.

关 键 词：低能耗建筑 地源热泵 蓄热特征 数值模拟 空气换热器 地埋管 

分 类 号：TK521[动力工程及工程热物理—热能工程]