Vasile PUŢAN

ABOUT THE DETERMINATION OF BUILDING MATERIALS’
THERMAL CONDUCTIVITY
The paper introduces an experimental method of determining the
thermal conductivity of building materials. The installation we have created is
based on the Fouriér law allows the determination of the thermal conductivity of
the building materials’ which the test bars are made of, and implicitly, theirs
identification. This method does not allow an observation of the variation of
thermal conductivity with respect to temperature for the material under question,
the result of the analysis being in fact a mean value of thermal conductivity.
Keywords: conductivity, thermocouples, thermal conductivity, thermal gradient
Cuvinte cheie: conductivitate, termocupluri, conducţie termică, gradient termic

32 DETERMINAREA CONDUCTIVITĂŢII TERMICE

In the article is analyzed a vapour-compression refrigeration system
using R12 refrigerant. With experimental values of the evaporating and
condensing temperatures and using the Cool Pack program, the system
performance may be evaluated. Thermodynamic performance of a refrigeration
system is defined by evaluating the cooling efficiency, which permit the
quantitative assessment of heat losses, qualitatively described by the second
principle of thermodynamics.
Cuvinte cheie: agent frigorific, eficienţă frigorifică, entalpie, freon R12,
termocupluri
Keywords: refrigerant, cooling efficiency, enthalpy, Freon R12,
thermocouples

48 DETERMINAREA CARACTERISTICILOR PRINCIPALE