Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2014
Volume 17
Issue 3
Topic:
##### Civil Engineering
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Kyureghyan K. , Kluza F. , Góral D. , Kluza P. 2014. METHOD FOR DETERMINATION OF CRITICAL AND EFFECTIVE DIAMETER OF PIPELINE INSULATION, EJPAU 17(3), #10.
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

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
20-950 Lublin
Poland

Franciszek Kluza
Department of Refrigeration and Food Industry Energetics, University of Life Sciences in Lublin, Poland
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