Linear heat transfer coefficients of combined roof structural units

Olena Filonenko

doi:10.33644/scienceandconstruction.v24i2.4

Olena Filonenko Candidate of Technical Sciences, Associate Professor, National University «Yuri Kondratyuk Poltava Polytechnic», Poltava, Ukraine https://orcid.org/0000-0001-8571-9089

DOI: https://doi.org/10.33644/scienceandconstruction.v24i2.4

Keywords: heat transfer resistance, heat loss, combined roof, thermal insulation, heat transfer linear coefficient, eave, temperature field

Abstract

The paper aims to elaborate the engineering methods of calculating heat loss through combined roof constructions. The roof heat losses can reach up to 40% of total heat losses of a building and affect its energy efficiency class. In Ukrainian construction regulations there are no roof heat loss determination methods, which would take into account the structural features as well as linear heat transfer coefficients values. For typical structural units only the linear heat transfer coefficients values for wall structures and their elements are given in the State construction standard of Ukraine DSTU Б В.2.6-189:2013 Annex Г. Putting into the insulation practice of typical energy-efficient structural units of the combined roof eaves, adjoining to the ventilation shafts and roof superstructures will significantly increase the building thermal protection. The results of these units temperature field simulation allow to use the method of State construction standard of Ukraine DSTU ISO 10211:2005 for determining the linear heat transfer coefficients that can be used in engineering calculations of the heat transfer resistance of the respective structures and to supplement the State construction standard of Ukraine DSTU Б В.2.6- 189:2013 Annex Г. The combined roof structural units modeling was implemented by the finite element method. The paper is a continuation of the author's previous scientific research. The main papers are given in the bibliography.

The aim of this paper is to clarify the calculation methods of combined roofing heat losses considering heat transfer linear coefficients of roof structural units and to develop constructional solutions for typical energy efficient units.

Research methods are based on the calculation of two-dimensional temperature fields by finite element method and engineering methods for determining linear heat transfer coefficients.

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References

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