Publication detail

Evaluation Of The Emissivity Of Outer Surfaces Of Building Constructions

ŠŤASTNÍK, S. VALA, J. STEUER, R.

Original Title

Evaluation Of The Emissivity Of Outer Surfaces Of Building Constructions

English Title

Evaluation Of The Emissivity Of Outer Surfaces Of Building Constructions

Type

conference paper

Language

en

Original Abstract

The composition of coating materials, applied in the exterior layers of building constructions, affects the value of emissivity, important for the radiation of ther-mal energy from outer surfaces of such constructions into the free space. In case of most coating materials the rather rugged surfaces do not admit any di-rect measurement, based on the monitoring of the intensity of rays, reflected from the surface. The appropriate approach is the integral measurement of the reflected diffusive radiation from the surface, using the "ball method": its interior sphere for the wavelengths from 5 to 20 ?m must be gold-coated. However, such expensive equipment is not available in the Czech Republic, thus the indi-rect method of the measurement of the thermal resistance of the air gap has been applied where both the thermal flow and the heat radiation are active. The results of such measurements give a chance to evaluate the proportions of both these processes of heat propagation. The paper demonstrates practical results for various coating materials, supported by the automatic measurement device LAMBDA (Holometrix, USA).

English abstract

The composition of coating materials, applied in the exterior layers of building constructions, affects the value of emissivity, important for the radiation of ther-mal energy from outer surfaces of such constructions into the free space. In case of most coating materials the rather rugged surfaces do not admit any di-rect measurement, based on the monitoring of the intensity of rays, reflected from the surface. The appropriate approach is the integral measurement of the reflected diffusive radiation from the surface, using the "ball method": its interior sphere for the wavelengths from 5 to 20 ?m must be gold-coated. However, such expensive equipment is not available in the Czech Republic, thus the indi-rect method of the measurement of the thermal resistance of the air gap has been applied where both the thermal flow and the heat radiation are active. The results of such measurements give a chance to evaluate the proportions of both these processes of heat propagation. The paper demonstrates practical results for various coating materials, supported by the automatic measurement device LAMBDA (Holometrix, USA).

Keywords

emissivity, thermal radiation, algae occurence on ETICS

RIV year

2006

Released

13.10.2006

Publisher

Vydavatelstvo STU

Location

Kočovce, Slovensko

ISBN

80-227-2536-6

Book

Proceedings of the seminar Thermophysics 2006

Pages from

7

Pages to

8

Pages count

2

Documents

BibTex


@inproceedings{BUT21617,
  author="Stanislav {Šťastník} and Jiří {Vala} and Radek {Steuer}",
  title="Evaluation Of The Emissivity Of Outer Surfaces Of Building Constructions",
  annote="The composition of coating materials, applied in the exterior layers of building constructions, affects the value of emissivity, important for the radiation of ther-mal energy from outer surfaces of such constructions into the free space. In case of most coating materials the rather rugged surfaces do not admit any di-rect measurement, based on the monitoring of the intensity of rays, reflected from the surface. The appropriate approach is the integral measurement of the reflected diffusive radiation from the surface, using the "ball method": its interior sphere for the wavelengths from 5 to 20 ?m must be gold-coated. However, such expensive equipment is not available in the Czech Republic, thus the indi-rect method of the measurement of the thermal resistance of the air gap has been applied where both the thermal flow and the heat radiation are active. The results of such measurements give a chance to evaluate the proportions of both these processes of heat propagation. The paper demonstrates practical results for various coating materials, supported by the automatic measurement device LAMBDA (Holometrix, USA).",
  address="Vydavatelstvo STU",
  booktitle="Proceedings of the seminar Thermophysics 2006",
  chapter="21617",
  institution="Vydavatelstvo STU",
  year="2006",
  month="october",
  pages="7--8",
  publisher="Vydavatelstvo STU",
  type="conference paper"
}