A new local pressure loss coefficient model of a duct tee junction applied during transient simulation of a HVAC air-side system

作者：Wang, Qiujian; Pan, Yiqun^*; Zhu, Mingya; Huang, Zhizhong; Xu, Peng

来源：Journal of Building Performance Simulation, 2018, 11(1): 113-127.

DOI：10.1080/19401493.2017.1288762

• HVAC air-side system
• system pressure-and-flow coupling
• local pressure loss coefficient
• uniform design
• feature weighted SVR

Most of the local pressure loss coefficient (LPLC) models for duct fittings used in heating, ventilation and air conditioning (HVAC) air-side system transient simulations are simplified. The LPLCs are defined as having a constant value at the rated flow condition or as having a polynomial function of the flow ratio (or velocity ratio). To determine the influence of these simplifications, this study used a diverging tee junction as an example. First, we performed CFD calculations to generate a new LPLC dataset and trained a data-driven model using feature weighted support vector regression (FWSVR) combined with particle swarm optimization (PSO-FWSVR). Finally, we compared this new LPLC model with the two traditional models at the level of both individual junction and air-side system. The results show that the accuracy of the new model is greatly improved and the LPLC model can have a significant impact on the system operation condition.

• 出版日期2018
• 单位同济大学