Volume 17
Issue 3
Civil Engineering
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume17/issue3/abs-10.html
METHOD FOR DETERMINATION OF CRITICAL AND EFFECTIVE DIAMETER OF PIPELINE INSULATION
Khachatur Kyureghyan1, Franciszek Kluza2, Dariusz Góral2, Paweł Artur Kluza1
1 Department of Applied Mathematics, University of Life Sciences in Lublin, Poland
2 Department of Refrigeration and Food Industry Energetics, University of Life Sciences in Lublin, Poland
ABSTRACT
The objective of the paper is to define the physical-mathematical conditions
supporting the proper determination of the critical and minimally effective diameter
of insulation, because of its important role in refrigeration, air conditioning
and heat pumps systems. A simple case of heat exchange under steady state conditions
for cylindrical pipes with single – layer insulation was analyzed, where thermal
conductivity of the pipe material (k1) and insulation (k2)
as well as heat transfer coefficients at the pipe interior surface and the insulation
exterior surface are the constant values. There has been presented a simple method
to determine the optimal insulation diameters that guarantee an increase or decrease
of losses due to overall heat transfer per unit length of the pipe.
Key words: heat transfer, thermal insulation, break-even radius.
Khachatur Kyureghyan
Department of Applied Mathematics, University of Life Sciences in Lublin, Poland
13 Akademicka
20-950 Lublin
Poland
Franciszek Kluza
Department of Refrigeration and Food Industry Energetics, University of Life Sciences in Lublin, Poland
44 Doświadczalna
20-280 Lublin
Poland
email: franciszek.kluza@up.lublin.pl
Dariusz Góral
Department of Refrigeration and Food Industry Energetics, University of Life Sciences in Lublin, Poland
44 Doświadczalna
20-280 Lublin
Poland
Phone +48 81 4610061
email: dariusz.goral@up.lublin.pl
Paweł Artur Kluza
Department of Applied Mathematics, University of Life Sciences in Lublin, Poland
13 Akademicka
20-950 Lublin
Poland
Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.