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Abstract
On the basis of theoretical considerations of convective-radiative heat transfer, a relationship was developed enabling the total convective and radiative heat flux QC+R emitted from any object at tw and its surroundings at t∞ to be calculated from known values of the surface temperature of such an object, i.e., the known temperature difference Δt=tw - t∞ and average air temperature Tav. This relationship is applied to thermal imaging cameras with the aim of developing appropriate software to enhance their measurement capabilities. They can then be used not only for monitoring and measuring temperature, local overheating, heat losses through insulation materials, thermal bridges, constructional defects, moisture, etc., but also for measuring the heat losses from any object, such walls and buildings. This empirical relationship includes constants relating to the object itself, such as its characteristic dimension l, surface area A, emissivity ε and temperature parameters, which depend on tw, t∞, Δt and Tav and on the physical properties of air. Experimental validation of the proposed relationship, performed for two values of the surface emissivity ε, showing the discrepancies ΔQC+R=1.75% (for ε=0.884) and 4.85% (for ε=0.932), has confirmed its correctness and its practicability.
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Authors (3)
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Grzegorz J. Kwiatkowski
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- Publication version
- Accepted or Published Version
- DOI:
- Digital Object Identifier (open in new tab) 10.18280/ijht.410201
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Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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International Journal of Heat and Technology
no. 41,
pages 279 - 292,
ISSN: 0392-8764 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Ryms M., Kwiatkowski G. J., Lewandowski W.: Empirical Relationship Describing Total Convective and Radiative Heat Loss in Buildings// International Journal of Heat and Technology -Vol. 41,iss. 2 (2023), s.279-292
- DOI:
- Digital Object Identifier (open in new tab) 10.18280/ijht.410201
- Sources of funding:
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- Statutory activity/subsidy
- Verified by:
- Gdańsk University of Technology
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