基于系统仿真和CFD的双系统冷凝器管路优化

System and CFD Simulation Based Refrigerant Circuitry Optimization of a Dual-System Condenser

摘要:

将制冷系统仿真与CFD(计算流体动力学)模拟相结合,对一风冷双系统屋顶机的冷凝器进行管路布置的优化研究。CFD模拟空气的流动,得到冷凝器迎风面速度分布。通过制冷系统模型,对管路布置优化前后的冷凝器和制冷系统进行仿真计算。从部件和系统两个层面评价管路布置的改善效果。在部件层面,改进后的管路布置使冷凝器的换热量提高24.1%。在系统层面,单个系统运行时的制冷量增加3.6%,系统能效提高8.1%。本研究思路对于相关产品的优化设计具有参考价值。

Abstract:

Refrigerant circuitry of the dual-system condenser in a roof-top air-conditioning unit was optimized using refrigeration system and CFD (Computational Fluid Dynamics) simulations. CFD simulation of airflow was carried out to obtain the frontal velocity distribution of the condenser. Refrigeration system simulation was used to design refrigerant circuitry of the condenser and predict the system performance. The proposed circuitry design was evaluated at both component and system levels. At the component level, results indicated a 24.1% increase on the heat transfer rate of new condenser in comparison with the original design. At the system level, the cooling capacity and COP were improved by 3.6% and 8.1%, respectively, when only one system was running. The proposed method can be widely applied to this type of air-cooled products.