制冷学报2024，Vol.45Issue(2)：81-93,13.DOI:10.3969/j.issn.0253-4339.2024.02.081
阵列低环温空气源热泵外流场模拟研究
External Flow Field Simulation of Low Ambient Temperature Air-source Heat Pump Array
摘要
Abstract
In this study,physical models of six-row and four-row arrays of a low-ambient-temperature air-source heat pump with and without wall obstruction are established.A three-dimensional numerical simulation of the ambient flow field of the low-ambient-temperature air-source heat pump under nominal working conditions at 261.15 K is carried out.In this study,the inlet air temperature of the evaporator surface and the heat transfer rate of the low-ambient-temperature air-source heat pump under different horizontal wind speeds are investigated.The location of the unit under the worst conditions is determined,and the influence of cold air backflow on the heat transfer performance is analyzed.The ambient wind hindered the diffusion of cold air at the fan outlet and increased the deflection angle of the fan outlet,resulting in the accumulation of cold air in the upper part of the fan,and the cold air reflux phenomenon in the unit was more obvious inside and on the lee side the array.The results showed that when the horizontal distance between the units was 0.6 m,the horizontal wind speed increased from 0 to 5 m/s.The lowest inlet air temperature of the array unit is 2.44-3.69 K lower than the ambient temperature;the average heat transfer decreases by 1%-6.2%,and the average inlet air temperature is 0.78-1.57 K lower than the ambient temperature.When the distance between the unit and wall is 0.6 m,the horizontal wind speed increases from 0 m/s to 5 m/s,respectively;the lowest inlet air temperature of the array unit is 3.51-4.14 K lower than the ambient temperature;the average heat transfer rate decreases by 5.9%-11.5%,and the average inlet air temperature is 1.29-1.98 K lower than the ambient temperature.On this basis,an array air-source heat pump was simulated under different lateral spacings and distances from the wall.The results showed that increasing the lateral spacing or distance from the wall enhanced the heat transfer of the array low-ambient-temperature air-source heat pump unit.When the lateral spacing increases to 1.8 m,the average heat transfer rate of the array unit can reach more than 96.5%of the baseline heat transfer rate of the array unit.When the distance from the wall is increased to 1.8 m,the average heat transfer rate of the array unit can be more than 91.3%that of the baseline unit.A horizontal spacing or a spacing from the wall of 1.2 m is a better installation spacing,which provides a theoretical basis for on-site installation.关键词
低环温空气源热泵阵列/数值模拟/冷风回流/环境风场Key words
low ambient temperature air-source heat pump array/numerical simulation/cold air backflow/ambient wind fields分类
通用工业技术引用本文复制引用
谭庆澎,刘金平,陈建勋,陈潇,陈梓宇..阵列低环温空气源热泵外流场模拟研究[J].制冷学报,2024,45(2):81-93,13.基金项目
国家自然科学基金(51776075,51976063)资助项目.(The project was supported by the National Natural Science Foundation of China(No.51776075,No.51976063).) （51776075,51976063）
