Unterschiedliche Berechnungsverfahren für die Berechnung der Wärmeströme erdberührter Bauteile

Translated title of the contribution: Different calculation methods for determining the heat flow of earth‐contacting components

Research output: Contribution to journalArticle

Abstract

A building loses a not insignificant part of its heat through over the earth‐coupled elements. Although these heat losses of are not as enormous as those of the elements that are in contact with the outside air, they still play an important role in determining the total heat loss of a building. The heat flow, which flows from the heated areas via the earth‐coupled elements to the outside air, undergoes damping. The main influence on this damping is the large thermal inertia of the ground. That is why the time delays occur. It is very important to consider these influences when calculating the heat flow of earth‐coupled elements. In this study, the results of the calculation of heat losses to the ground according to EN ISO 13370 are compared with two‐ and three‐dimensional simulations. The heat losses for the indirect method with ψg‐values according to EN ISO 13370 were calculated on the one hand based on median monthly temperatures with the formulas, on the other hand using sinusoidal variations in temperature and with the aid of a two‐dimensional thermal bridge programs. Three different applications were examined and analyzed: bottom slab, conditioned basement and unconditioned basement. Furthermore, different component structures were defined for these systems. With this approach, the effects of the thermal quality of the earth‐coupled elements on the heat losses were analyzed. In addition, the base details of the systems were examined in different variants to determine the major influence of the installation situation on the heat losses.
Original languageGerman
Pages (from-to)104-110
JournalBauphysik
Volume41
Issue number2
DOIs
Publication statusPublished - 2 Apr 2019

ASJC Scopus subject areas

  • Engineering(all)

Fields of Expertise

  • Sonstiges

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