大容量螺杆式无霜空气源热泵系统特性研究

本文提出一种利用螺杆式压缩机余热进行辅助解吸的无霜空气源热泵系统,建立了一套余热回收无霜空气源热泵数学模型,并实验验证了模型的准确性,分析了环境温度、相对湿度、解吸循环空气温度和质量流量等参数对系统的影响.结果表明:该系统的余热量占解吸所需总能量的比例最高可达0.61;COP受解吸循环空气温度与质量流量的影响较小,受空...

Study on Characteristics of Frost-free Air Source Heat Pump System with Large Capacity and Screw Compressor

In this study a novel frost-free air-source heat pump (FASHP) system, which uses the waste heat of a screw compressor for auxiliary desorption, was proposed. A mathematical model of FASHP with waste heat desorption was developed, and the accuracy of this model was verified experimentally. A theoretical analysis was conducted concerning the influence of ambient temperature, relative humidity, air temperature, and flow rate on the desorption of the system. The results show that the ratio of the waste heat that the system can use for desorption to the total energy required for desorption could reach 0.61. The coefficient of performance (COP) was affected by the air temperature and humidity, but less affected by the temperature and mass flow of the desorption air. As the ambient temperature increased and the relative humidity decreased to the working condition at 7 °C/70%, the COP reached 2.52. The COP of the novel FASHP system increased by 10% compared to the original system. It was proved that this system can run efficiently and continuously under low-temperature and high-humidity environmental conditions