Journal
ENERGY
Volume 249, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2022.123425
Keywords
Atrium; Glazed roof; Thermal stratification; Energy model; CFD model; HVAC load
Categories
Funding
- National Key Research and Development Program of China [2018YFC0704303]
- Postdoctoral Research Funding Plan of Jiangsu Province, China [1501066B]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [SJCX21-0453]
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An increasing number of public buildings have functional zones without physical partitioning, leading to non-uniform thermal environments. Understanding the influence of this phenomenon on HVAC energy consumption is of great significance.
More and more public buildings have functional zones without physical partitioning, and non-uniform thermal environments often exist inside it. Understanding this phenomenon and its influences on HVAC energy consumption is of great significance. Field measurements were carried out on a transport station in Nanjing, South China during daytimes, and thermal stratifications were found to be evident in the non-air-conditioned atrium with the linear gradients being range of 0.06-2.0 & DEG;C/m. An energy model coupled with CFD model is developed and verified by measured data. Further simulations are performed under cases of atrium height, glazed-roof material and season. The results show that the CFD simulated convective heat transfer coefficients of inner surfaces (CHTCIS) of the atrium vary according to scenario; linear temperature gradients differ by cases, and specifically there are two gradients in hot summer with the dimensionless interface heights being approximately 0.56-0.6; the HVAC loads of the airconditioned zones are estimated to be 115-146 W/m2 when adopting thermal stratification and user defined CHTCIS, and larger than that when no thermal stratification and built-in CHTCIS. The double low-e 6 mm plane glass contributes to the most favorable temperatures in both cold winter and hot summer, followed by the smallest HVAC loads. (c) 2022 Elsevier Ltd. All rights reserved.
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