The calculation of heat flow in the ground, in particular the time-dependent heat loss through the foundation, poses particular problems due to three-dimensional flow and very long time scales. In this paper a new tool of analysis called “dynamic thermal networks†is presented briefly and used to analyze the time scales for the time-dependent heat loss for different types of foundations: a slab-on-ground, a cellar, and a split-level foundation.
The heat loss may be divided into a transmittive and an absorptive component. The transmittive and absorptive step-response fluxes and the corresponding weighting functions provide a precise description of the time scales of the heat flow to the ground. It is shown that the transmittive component has time scales of a decade and even more, while the absorptive component has a time scale of days only.
Citation: Thermal Performance of Exterior Envelopes of Whole Buildings IX
Product Details
- Published:
- 2004
- Number of Pages:
- 10
- File Size:
- 1 file , 5.9 MB
- Product Code(s):
- D-BldgsIX87
