Air Distribution Simulation and Comfort Evaluation of Large Space Building Based on RANS and LES

doi:10.16182/j.issn1004731x.joss.23-FZ0820

Abstract

Abstract:

Air distribution simulation and thermal comfort evaluation for heating, ventilation and air conditioning (HVAC) design of large space buildings is of great significance for the human thermal comfort improvement and the energy consumption reduction. By combining the steady analysis based on RANS and the transient analysis of large eddy simulation (LES), an air distribution simulation and thermal comfort evaluation process in large space buildings is established. Due to the low calculation consumption, the steady analysis based on RANS is conducted to efficiently evaluate the thermal comfort and the air quality under multiple working conditions. Considering the high computational consumption of LES, the transient analysis is conducted only under typical working condition. In this way, the entire process of air conditioning and the time required for the indoor temperature to reach the set temperature can be obtained. The process is important for the optimization of air conditioning operation strategy and energy saving. The accuracy of RANS and LES based on experimental results are verified, and the application of the methods used in the practical engineering projects is introduced, which can provide reference for other engineering projects.

Key words: reynolds average navier-stokes(RANS), large eddy simulation(LES), large space building, air distribution, comfort evaluation

CLC Number:

TP399

Zhang Shen, Cheng Ming, Wang Yifan, Meng Fankai, Li Ting, Chen Han, Ji Zhifeng. Air Distribution Simulation and Comfort Evaluation of Large Space Building Based on RANS and LES[J]. Journal of System Simulation, 2023, 35(10): 2212-2222.

Figures/Tables 16

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Table 1

Simulation parameter setting of RANS and LES

参数类别	RANS	LES
边界面	无滑移边界	Non-equilibrium enhanced wall function
湍流模型	k- $ε$	WALE^[21]
模型参数	C_w=0.16	C_w=0.16
求解信息	迭代3 000次	模拟时长200 s 积分步长0.002 s

Table 1

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Table 2

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工况		舞台送风量/ (m³/h)	舞台送风温度/℃	座位送风量/(m³/h)	座位送风温度/℃	设计温度/℃	相对湿度/%	新陈代谢率/met	服装热阻/clo	人体温度/ ℃
case1	夏季	1 850	19	68	19	27	50	1.2	0.5	36.5
case2		1 850	19	68	19	30	50	1.2	0.5	36.5
case3		1 850	19	68	19	35	50	1.2	0.5	36.5
case4	冬季	1 850	24	68	24	10	50	1.2	1.1	36.5
case5		1 850	24	68	24	18	50	1.2	1.1	36.5
case6		1 850	24	68	24	2.6	50	1.2	1.1	36.5
case7		1 850	24	68	27	2.6	50	1.2	1.1	36.5

工况		平均风速/(m/s)	平均温度/℃	平均 PMV	平均 PPD/%	平均空气龄/s	平均换气次数/(次/h)	最大空气龄/s	最小换气次数/(次/h)
case1	夏季	0.05	23.78	0.45	10.18	91.45	39	476.44	8
case2		0.06	23.93	0.57	14.76	140.89	26	540.99	7
case3		0.07	27.36	1.55	53.00	168.20	21	490.54	7
case4	冬季	0.17	17.35	-0.56	15.19	168.93	21	377.63	10
case5		0.13	22.28	0.51	11.56	173.19	21	438.20	8
case6		0.21	11.12	-1.86	65.32	140.62	26	307.10	12
case7		0.21	15.21	-1.10	35.69	198.51	18	642.85	6