空气源热泵新型除霜技术及智能除霜策略

Innovative Defrosting Technologies and Smart Control Strategies of Air-Source Heat Pumps

当周围环境中空气温度和湿度达到一定条件时,室外换热器空气侧结霜是影响空气源热泵运行的重要因素。针对传统热泵除霜方法无法满足新应用场景的迫切需求,为了解决空气源热泵结霜造成的系统性能及供热量下降问题,本文深入研究了空气源热泵机组在不同使用环境条件下的结霜和除霜过程,开发了防积冰除霜方法、大流量除霜方法、防积雪控制等关键除霜技术和智能除霜控制逻辑,并在机组上进行了实验验证和对比研究。研究结果表明:通过多种除霜方法的智能选择和控制优化,可以满足不同使用环境条件下的除霜需求,并大幅缩短除霜时间,为空气源热泵的性能提升和推广应用提供了有效的解决方案。

When the temperature and humidity of ambient air reach certain conditions, frosting on the air side of outdoor heat exchanger is an important factor for air source heat pump. The traditional defrosting methods of heat pumps cannot meet the urgent needs and quick developments of new application scenarios. In order to prevent the degradation of coefficient of performance and heating capacity caused by the outdoor heat exchanger frosting, this study deeply investigates the frosting and defrosting process of air-source heat pump units under different temperature conditions. Several defrosting methods of large flow defrosting, anti icing defrosting and snow prevention were proposed and developed. The smart defrosting control strategies were also studied based on the above key defrosting technologies. Both the defrosting methods and control strategies were tested and compared on the experimental units. The results show that the defrosting requirements under different operating conditions can be satisfied by the optimization of proposed defrosting methods and smart control strategies. The defrosting period can also be greatly reduced. It is an effective solution for improving the coefficient of performance and promoting the application of air-source heat pump.