| 摘要: |
| 对一台空气源热泵空调器在不同环境条件下室外换热器的动态结霜性能进行了实验研究，分析了进风温、湿度对热泵空调器结霜量及霜层厚度的影响。实验中考虑了结霜引起的热泵系统蒸发温度及风机流量的变化，采用显微照相法测量翅片表面霜层厚度，结霜量则通过测量蒸发器进出口含湿量的方法来获得。实验结果表明，室外换热器结霜量随时间线性增长，而翅片表面霜层厚度则分为初始段、匀速增长段和快速增长段三个阶段；在结霜循环的最后20％～30％的快速增长段内霜层生长速率大大加快，可达匀速生长段霜层生长速率的2．4，3．3倍。对于不同的工况，蒸发器均在进风温度0～3℃附近时结霜最为严重，且相对湿度对霜层厚度的影响要大于对结霜量的影响。 |
| 关键词: 热工学 结霜特性 结霜实验 空气源热泵 霜层厚度 |
| DOI：10.3969/j.issn.0253-4339.年份（4位数字）.月份（2位数字）.文章的起始页码（3位数字） |
| Received:January 18, 2006 |
| 基金项目: |
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| Effects of Outdoor Air Parameters on Frosting Characteristics of Fin-tube Evaporator for Air Source Heat Pump Unit |
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| Abstract: |
| The effects of the outdoor air temperature and humidity on the frosting characteristics of the fin - tube evaporator coils of an air source heat pump were investigated experimentally. The variations of the evaporating temperature and the air flow rate due to the frost accumulation on the coils were considered in the experiments. The frost thickness was measured by using micro- photograph, and the frost accumulation mass was estimated by using the difference in measured humidity before and after the test evaporator. The experimental results indicate that the frost accumulation mass increases linearly with the frosting time, but the growth rate of the frost thickness could be divided into three stages, initial stage, constant speed stage, and sharply increasing stage. In the sharply increasing stage, which occurred in the last period with 20% -30% total frosting time, the growth rate of the frost thickness was 2.4-3.3 times as big as that in the constant speed stage. In addition, it is found that the frost formation rate was maximized when the outdoor air temperature was about 0 - 3% with different outdoor air relative humidity, and the effect of the relative humidity on the frost thickness growth was more than on the frost accumulation mass rate. |
| Key words: Pyrology Frosting Characteristics Frost growth experiment Air source heat pump Frost thickness |
