Thermal Environment Monitoring and Analysis of an Enclosed Gymnasium with Double-Layered Membrane Roof in Summer

doi:10.16183/j.cnki.jsjtu.2021.259

Abstract

Abstract:

The membrane structure roof is widely used in large-span buildings such as stadiums and gymnasiums because of its full use of natural light sources and flexible forms. In order to solve the prominent problems such as poor thermal insulation performance and prone to external environmental factors, the multi-layer membrane structure design, laying of insulation layers, and other schemes are applied to engineering practice. However, there is still a gap in the relevant research of thermal environment monitoring and analysis. In order to study the thermal environment of the double-layer PTFE (polytetrafluoroethylene)-aerogel roof, multi-point thermometers were uniformly arranged to monitor, and the overall temperature field was constructed using the measured data. A thermophysical model which could accurately reflect the change of temperature field was established, whose average error was less than 5%. With the laying of roof insulation layer as the variable, three working conditions, i.e., no insulation layer, only rock wool insulation layer, and all aerogel insulation layer were constructed based on the model. The comparison indicates that the laying of aerogel reduces the average temperature of indoor space by 2.0 ℃, the original working condition has the best thermal insulation effect, and the average temperature difference between indoor and outdoor is 9.6 ℃. This paper can provide reference for the thermal insulation design of membrane structure roofs.

Key words: membrane structure, thermal environment, enclosed gymnasium, aerogel

CLC Number:

TU111

SONG Yinbo, YIN Yue, YAN Yongsheng, WANG Xiaoqing, CHEN Wujun, REN Sijie. Thermal Environment Monitoring and Analysis of an Enclosed Gymnasium with Double-Layered Membrane Roof in Summer[J]. Journal of Shanghai Jiao Tong University, 2023, 57(2): 183-193.

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材料	厚度/mm	密度/(kg·m^-3)	恒压热容/(kJ·kg^-1·K^-1)	导热系数/(W·m^-1·K^-1)	透光率/%
外层PTFE膜	0.8	1624.850	1.05	0.256	13
空气	4000.0	1.185	1.01	0.026	100
气凝胶	4.0	165.246	0.55	0.020	70
岩棉	150.0	120.470	1.22	0.038	0
内层PTFE膜	0.3	1200.000	1.05	0.121	28

测点组	误差平均值/℃	相对误差平均值/%	最大误差值/℃	最大相对误差值/%	相对误差<5%的时间段占比/%	相对误差>5%的主要时间段
外膜	1.5	3.9	5.9	14.3	76.2	15:30—18:00
内膜	1.1	2.9	2.2	6.3	86.1	16:30—18:00
室内	0.5	0.4	1.1	3.4	100.0

工况	阻热材料	外膜平均温度	内膜平均温度	看台平均温度	室内外温差
原始工况	72%岩棉和28%气凝胶	42.3	35.4	32.7	9.6
工况1	0%岩棉和0%气凝胶	41.9	39.6	33.2	5.5
工况2	72%岩棉和0%气凝胶	42.0	39.1	33.0	6.0
工况3	0%岩棉和100%气凝胶	42.4	36.4	33.4	7.5