A new virtual sphere method to predict free-running temperature

Li Xiang; Chen Bin; Fan Xinying

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A new virtual sphere method to predict free-running temperature

Li Xiang,Chen Bin *,Fan Xinying

School of Civil Engineering, Dalian University of Technology, Dalian, 116024, China

*Correspondence author

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Funding: National “Twelfth Five-Year” Science and Technology Support Program（No.2012BAJ02B05 ）, NSFC Foundation （No.51178073, 51578103）

Opened online:15 March 2017

Accepted by: none

Citation: Li Xiang,Chen Bin,Fan Xinying.A new virtual sphere method to predict free-running temperature[OL]. [15 March 2017] http://en.paper.edu.cn/en_releasepaper/content/4721233

The free-running temperature is a essential indicator to evaluate the thermal performance of a passive solar house in early design. However a easy-fast, accurate, and dynamic prediction method is lacking for decision-making in early design. Exited accurate and elaborate methods need detailed building information and simulation tools, which are complex and time-comsuming. Besides, exited simpilied methods are still complex for architects or have large hourly error. This paper introduced the virtual sphere method to calculate the dynamic thermal storage of the room, and proposed a new quasi-steady method to predict free-running temperatur. The study on thermal storage performance of a wall indicated only a indoor-side thin effective thermal capacitance layer has dominated effect on thermostability of the indoor space, and the depth of thin layer can be determined by thermal penetration depth formula. In addition, the room effetive thermal capacitance can be equivalent to a virtual sphere, and the dynamic thermal storage can be fast calculated by fitted formula of the classic unsteady heat transfer of a sphere. Then the hourly room free-running temperature can be fast predicted. The empirical validion of a light-weight and a heavy weight passive solar house demonstrated the hourly prediction can be all within the deviation range of ± 3.0 C

Keywords:Building physics; Passive solar house; Early design decision; Free-running temperature; Virtual sphere; Thermal penetration depth

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