Lucia VÎLCEANU


32-83 ESTIMAREA CONCENTRAȚIEI DE POLUANȚI CU SCREEN VIEW

ESTIMATING POLLUTANT CONCENTRATION USING SCREEN VIEW
Screen View is a program that uses Gaussian air dispersion model to estimate pollutants concentration at ground level. In function of pollutant source type, weather conditions and pollutant characteristics, is calculated the concentration (in μg/m3) vs. distance from source (in m).
Keywords: air pollution, Gaussian model for pollutant dispersion in air
Cuvinte cheie: poluarea aerului, model Gaussian al dispersiei poluanților în atmosferă

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30-85 DIMENSIONAREA FILTRELOR RAPIDE DE NISIP UTILIZATE LA TRATAREA APEI

DIMENSSIONIG OF RAPID SAND FILTERS USED FOR WATER TREATMENT
In this paper is presented the functioning and the dimensioning procedure of rapid sand filters used in water treatment plants. The dimensioning calculus refers to filter basin, water inflow and draining systems.
Keywords: rapid sand filter, treated water, dimensioning
Cuvinte cheie: filtru rapid de nisip, apă tratată, dimensionare

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26-68 CURĂŢIREA SUPRAFEŢELOR METALICE PENTRU TRATAMENTE IN-SITU

CLEANING THE METALLIC SURFACES FOR IN-SITU TREATMENTS
The paper presents a study on the native oxide film formed on steels surface by air exposure at ambient conditions and its cleaning. As in-situ thermochemical treatments require a clean and active surface, argon ion sputtering process is usually employed to eliminate this superficial oxide layer.
Keywords: atmospheric oxidation, steel, iron oxides, ionic bombardment

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20-32 DETERMINAREA CONDUCTIVITĂŢII TERMICE A MATERIALELOR DE CONSTRUCŢII

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


24-55 METODĂ ANALITICĂ ŞI EXPERIMENTALĂ PENTRU DETERMINAREA COEFICIENTULUI DE CONVECŢIE TERMICĂ

ANALYTIC AND EXPERIMENTAL METHOD FOR
DETERMINATION OF CONVECTIVE HEAT
TRANSFER COEFFCIENT
This paper describes how analytic and experimental method for
determining the heat convection coefficient for a cylindrical wall placed
horizontally and warmed on the inside. Analytical method consists in calculating
the criteria of similarity (invariants) describing the phenomenon of thermal
convection, and by experimental method taking into account heat transfer by
free convection and radiation between the wall and the environment.
Cuvinte cheie: convecţie liberă, coeficient de convecţie termică,
criteriu de similitudine, metodă experimentală
Keywords: free convection, convection heat transfer coefficient,
similarity criterion, experimental method

55 METODĂ ANALITICĂ ŞI EXPERIMENTALĂ


22-48 DETERMINAREA CARACTERISTICILOR PRINCIPALE ALE UNEI INSTALAŢII FRIGORIFICE CU COMPRIMARE MECANICĂ

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