摘要
空气源热泵作为一种高效、节能装置,具有广泛的应用前景和市场价值。建立了低环境温度空气源热泵物理模型,对1×1机组、3×4阵列以及4×6阵列低环温空气源热泵外流场进行三维数值模拟,分析水平风速、机组布置、墙面阻碍等因素对机组平均入口空气温度和机组换热性能的影响。结果表明,水平风速越大,机组布置数目越多,有墙面阻碍下的低环温空气源热泵机组平均入口空气温度越低。当水平风速增大到5m/s,无墙面阻碍下1×1机组、3×4阵列以及4×6阵列平均入口空气温度与环境温差分别为0.92℃、1.16℃和1.57℃;有墙面阻碍下温差分别为0.92℃、1.4℃和1.98℃。对于单一机组热泵,水平风速越大,机组换热量越大。对于阵列机组,水平风速越大,机组平均换热量出现先增大后下降的趋势。特别的当水平风速大于2.5m/s后,背风侧阵列机组入口空气温度降低,阵列机组平均换热量开始下降,有墙面阻碍下24台机组平均换热量为原来机组换热量的91.9%。阵列机组布置时,应增大机组距墙间距,减小墙面对风机出口冷空气扩散的阻碍。进行具体定量分析对实际工程和系统研究具有重要意义。
As a kind of high efficiency and energy saving device,air source heat pump has wide application prospect and market value.In this paper,the physical model of a low ambient temperature air source heat pump is established.The three-dimensional numerical simulation is carried out on the outflow field of a 1×1 unit,a 3×4 array and a 4×6 array low ambient temperature air source heat pump.The influences of horizontal wind speed,arrangement of unit layout,wall obstruction on the average inlet air temperature and heat transfer performance of the unit are analyzed.The results show that the higher the horizontal wind speed is,the more units are arranged,and the lower the average inlet air temperature of the low ambient temperature air source heat pump unit with wall obstruction is.When the horizontal wind speed increases to 5m/s,the average inlet air temperature and ambient temperature difference of 1×1 unit,3×4 array and 4×6 array without wall obstruction are 0.92℃,1.16℃and 1.57℃,respectively.The average inlet air temperature and ambient temperature difference of 1×1 unit,3×4 array and 4×6 array with wall obstruction are 0.92℃,1.4℃and 1.98℃,respectively.For a single unit heat pump,the greater the horizontal wind speed is,the greater the heat transfer rate of the unit is.For the array unit,the average heat transfer rate of the unit increases first and then decreases with the increase of horizontal wind speed.Especially,when the horizontal wind speed is greater than 2.5m/s,the inlet air temperature of the array unit on the leeward side decreases,and the average heat transfer of the array unit begins to decline.The average heat transfer of the 24 units under the wall obstruction is 91.9%of that of the original unit.When the array unit is arranged,the distance between the unit and the wall should be increased to reduce the barrier of cold air diffusion facing the fan outlet.Specific quantitative analysis is of great significance to practical engineering and system research.
作者
谭庆澎
刘金平
许雄文
王宇洁
陈勇春
Tan Qingpeng;Liu Jinping;Xu Xiongwen;Wang Yujie;Chen Yongchun(School of Electric Power,South China University of Technology,Guangzhou,510640;Guangdong Province Key Laboratory of Efficient and Clean Energy Utilization,Guangzhou,510640)
出处
《制冷与空调（四川）》
2023年第3期361-368,共8页
Refrigeration and Air Conditioning
基金
国家自然科学基金(51776075,51976063)资助项目。
关键词
低环温空气源热泵阵列
机组布置
数值模拟
环境风场
low ambient temperature air source heat pump array
arrangement of the unit
numerical simulation
ambient wind fields
