摘要
针对某一低温实验冷库的翅片管式风冷冷凝器,建立其稳态分布参数数学模型。从冷凝器的结构型式入手,详细分析了换热管路的布置方式,针对制冷剂与空气间的流动换热方式,在热质平衡原理的基础上以划分微元的方式建立了冷凝器的稳态分布参数数学模型。最后,实验验证仿真数学模型的准确性。在-25℃、-30℃、-35℃和-40℃等四种库温点下进行了稳态实验,测得了四种库温点下冷凝器各监测点的温度和制冷剂侧、空气侧的换热量,分析了制冷剂冷凝过程中过热、两相和过冷状态的变化以及各个状态区的长度。然后以实验工况为计算条件,运行仿真计算程序,得到了四种库温点下冷凝器各监测点的温度和制冷剂侧、空气侧换热量的计算值,通过曲线图分析了计算值和实测值之间的偏差,验证了换热模型的准确性。结果表明:模型具有一定的可靠性和精度,可为该类装置的以及整个冷库系统的仿真和优化设计提供了一定的理论基础。
The main work of this paper was to model a fin - and - tube air condenser, which was used in an low - temperature experimental cold storage, and to carry out simulation study and experimental study to validate the model of the condenser. At the beginning of this paper, the structure and circuitry path configuration were analyzed in detail. Considering the way of flow and heat exchange between refrigerant and air, the model of the condenser was a distributed - parameter＇model in the way of dividing heat exchange tube into elements based on the principle of energy and quality conservation. In the last, in order to validate the model, simulation study and experimental research were necessary. Steady experiments in which the temperatures of the cold storage were -25 ℃, -30℃, -35 ℃ and -40℃ respectively were made. After dealing with experimental data, we obtained the temperature of refrigerant along the heat exchange tube and the heat exchange capacity of refrigerant and air. In the same condition with experiments, we obtained the calculating results with the simulation Software, the error between the calculating results and experimental results was analysed with charts. The results indicate that the model is reliability and accuracy, which can provide a theoretical basis for simulation and optimization design of this kind of device and the refrigerator system.
出处
《低温与超导》
CAS
北大核心
2014年第11期78-82,共5页
Cryogenics and Superconductivity
关键词
冷库
管翅式冷凝器
仿真
Cold storage, Finned tube, Condenser, Simulation
