Heat storage is the key technology of passive solar utilization and heat protection design in summer, and accurate evaluation method or index are the foundation of heat storage design and utilization. The thermal insulation layer has a significant impact on the thermal storage performance of the wall. This article uses experiments and software simulation methods to investigate the heat storage characteristics of the external thermal insulation wall and reasonable heat storage performance evaluation index. Through field tests,three external wall surfaces and internal temperature decrement laws with different orientations have been obtained that due to the thermal insulation effect of the thermal insulation layer, the temperature fluctuations on the internal and external surfaces of the external wall structural layer are small, and the heat storage effect of the structure layers are significantly weakened. With the help of Kvalue software, the relationship between the thermal inertia index and the total degree of decrement of the single-material wall and the external thermal insulation composite wall are simulated and calculated. The results show that for a single-material external wall, there is a good correlation between the thermal inertia index and the total degree of decrement, while for the external thermal insulation composite wall,the correlation between the two is poor. For the external thermal insulation composite wall, a modification method for calculating the thermal inertia index of the multi-layer envelope structure is proposed. The correlation coefficient R2 between the thermal inertia index obtained by this method and the total degree of decrement of the wall is over 0.9.
Key words
heat storage /
insulation /
solar energy /
attenuation /
evaluation index
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] VERBEKE S, AUDENAERT A.Thermal inertia in buildings: a review of impacts across climate and building use[J]. Renewable and sustainable energy reviews, 2018, 82(3): 2300-2318.
[2] LONG L S, YE H.The roles of thermal insulation and heat storage in the energy performance of the wall materials: a simulation study[J]. Scientific reports, 2016, 6: 24181.
[3] ULGEN K.Experimental and theoretical investigation of effects of wall’s thermophysical properties on time lag and decrement factor[J]. Energy and buildings, 2002, 34(3): 273-278.
[4] LECCESE F, SALVADORI G, ASDRUBALI F, et al.Passive thermal behaviour of buildings: performance of external multi-layered walls and influence of internal walls[J]. Applied energy, 2018, 225(1): 1078-1089.
[5] KONTOLEON K J, EUMORFOPOULOU E A.The influence of wall orientation and exterior surface solar absorptivity on time lag and decrement factor in the Greek region[J]. Renewable energy, 2008, 33(7): 1652-1664.
[6] AL-SANEA S A, ZEDAN M F. Improving thermal performance of building walls by optimizing insulation layer distribution and thickness for same thermal mass[J]. Applied energy, 2011, 88(9): 3133-3124.
[7] TSILINGIRIS P T.Parametric space distribution effects of wall heat capacity and thermal resistance on the dynamic thermal behavior of walls and structures[J]. Energy and buildings, 2006, 38(10): 1200-1211.
[8] 王厚华, 庄燕燕, 吴伟伟, 等. 几种复合墙体构造的热工性能数值分析[J]. 重庆大学学报, 2010, 33(5): 126-132.
WANG H H, ZHUANG Y Y, WU W W, et al.Numerical analysis on the thermal performance of several kinds of composite wall construction[J]. Journal of Chongqing University, 2010, 33(5): 126-132.
[9] 赵金玲, 李杰, 党伟康. 热惰性指标对围护结构热稳定性量化作用机制[J]. 哈尔滨工业大学学报, 2018, 50(10): 182-188.
ZHAO J L, LI J, DANG W K.Quantitative mechanism of thermal inertia index on thermal stability of building envelope[J]. Journal of Harbin Institute of Technology, 2018, 50(10): 182-188.
[10] GB 50176—2016, 民用建筑热工设计规范[S].
GB 50176—2016, Code for thermal design of civil building[S].
[11] JGJ 134—2010, 夏热冬冷地区居住建筑节能设计标准[S].
JGJ 134—2010, Design standard for energy efficiency of residential buildings in hot summer and cold winter zone[S].
[12] JGJ 75—2012, 夏热冬暖地区居住建筑节能设计标准[S].
JGJ 75—2012, Design standard for energy efficiency of residential buildings in hot summer and warm winter zone[S].
PDF(2557 KB)
