Banjac, Miloš J.

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  • Banjac, Miloš J. (6)
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Author's Bibliography

Experimental and statistical survey on local thermal comfort impact on working productivity loss in university classrooms

Bajc, Tamara; Banjac, Miloš J.; Todorović, Maja; Stevanović, Žana

(2018)

TY  - JOUR
AU  - Bajc, Tamara
AU  - Banjac, Miloš J.
AU  - Todorović, Maja
AU  - Stevanović, Žana
PY  - 2018
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=0354-98361800160B
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/7971
AB  - The paper presents an experimental analysis of the relationship between local thermal comfort and productivity loss in classrooms. The experimental investigation was performed in a real university classroom during the winter semester in Belgrade. Measurements were taken for four scenarios, with different indoor comfort conditions. Variations were made by setting the central heating system on/off, adding an additional heat source to provoke higher indoor temperatures, and measuring the radiant asymmetry impact. Innovative questionnaires were developed especially for the research, in order to investigate students' subjective feelings about local thermal comfort and indoor environmental quality. Local PMV and PPD indices were calculated using data measured in situ. The results were compared to existing models recommended in literature and European and ASHRAE standards. Student productivity was evaluated using novel tests, designed to fit the purposes of the research. Surveys were conducted for 19 days under different thermal conditions, during lectures in a real classroom, using a sample of 240 productivity test results in total. Using the measured data, new correlations between the PMV, CO2, personal factor and productivity loss were developed. The research findings imply that local thermal comfort is an important factor that can impact productivity, but the impact of the personal factor is of tremendous importance, together with CO2 concentration in the classroom. © 2018 Serbian Society of Heat Transfer Engineers.
T2  - Thermal Science
T1  - Experimental and statistical survey on local thermal comfort impact on working productivity loss in university classrooms
VL  - 22
IS  - 00 (Online first)
SP  - 160
EP  - 160
DO  - 10.2298/TSCI170920160B
ER  - 
@article{
author = "Bajc, Tamara and Banjac, Miloš J. and Todorović, Maja and Stevanović, Žana",
year = "2018",
abstract = "The paper presents an experimental analysis of the relationship between local thermal comfort and productivity loss in classrooms. The experimental investigation was performed in a real university classroom during the winter semester in Belgrade. Measurements were taken for four scenarios, with different indoor comfort conditions. Variations were made by setting the central heating system on/off, adding an additional heat source to provoke higher indoor temperatures, and measuring the radiant asymmetry impact. Innovative questionnaires were developed especially for the research, in order to investigate students' subjective feelings about local thermal comfort and indoor environmental quality. Local PMV and PPD indices were calculated using data measured in situ. The results were compared to existing models recommended in literature and European and ASHRAE standards. Student productivity was evaluated using novel tests, designed to fit the purposes of the research. Surveys were conducted for 19 days under different thermal conditions, during lectures in a real classroom, using a sample of 240 productivity test results in total. Using the measured data, new correlations between the PMV, CO2, personal factor and productivity loss were developed. The research findings imply that local thermal comfort is an important factor that can impact productivity, but the impact of the personal factor is of tremendous importance, together with CO2 concentration in the classroom. © 2018 Serbian Society of Heat Transfer Engineers.",
journal = "Thermal Science",
title = "Experimental and statistical survey on local thermal comfort impact on working productivity loss in university classrooms",
volume = "22",
number = "00 (Online first)",
pages = "160-160",
doi = "10.2298/TSCI170920160B"
}
Bajc, T., Banjac, M. J., Todorović, M.,& Stevanović, Ž.. (2018). Experimental and statistical survey on local thermal comfort impact on working productivity loss in university classrooms. in Thermal Science, 22(00 (Online first)), 160-160.
https://doi.org/10.2298/TSCI170920160B
Bajc T, Banjac MJ, Todorović M, Stevanović Ž. Experimental and statistical survey on local thermal comfort impact on working productivity loss in university classrooms. in Thermal Science. 2018;22(00 (Online first)):160-160.
doi:10.2298/TSCI170920160B .
Bajc, Tamara, Banjac, Miloš J., Todorović, Maja, Stevanović, Žana, "Experimental and statistical survey on local thermal comfort impact on working productivity loss in university classrooms" in Thermal Science, 22, no. 00 (Online first) (2018):160-160,
https://doi.org/10.2298/TSCI170920160B . .
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Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia

Lazović, Ivan; Stevanović, Žarko M.; Jovašević-Stojanović, Milena; Živković, Marija M.; Banjac, Miloš J.

(2016)

TY  - JOUR
AU  - Lazović, Ivan
AU  - Stevanović, Žarko M.
AU  - Jovašević-Stojanović, Milena
AU  - Živković, Marija M.
AU  - Banjac, Miloš J.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1152
AB  - Previous studies have shown that poorly ventilated classrooms can have negative impact on the health of children and school staff. In most cases, schools in Serbia are ventilated naturally. Considering their high occupancy, classroom air quality test determines the level of air pollution, after which it is possible to implement corrective measures. The research presented in this study, was conducted in four schools which are located in different areas and have different architecture designs. Measurements in these schools have been performed during the winter (heating season) and spring (non-heating season) and the following results were presented: indoor air temperature, relative humidity, and carbon dioxide concentration. These results show that the classroom average concentration of carbon dioxide often exceeds the value of 1500 ppm, during its full occupancy, which indicates inadequate ventilation. Measurement campaigns show that carbon dioxide concentration increased significantly from non-heating to heating season in three of the four schools. Analysis of measurements also determined high correlation between relative humidity and carbon dioxide concentration in all schools in winter season. This fact may constitute a solid basis for the fresh air supply strategy.
T2  - Thermal Science
T1  - Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia
VL  - 20
SP  - S297
EP  - S307
DO  - 10.2298/TSCI150831173L
ER  - 
@article{
author = "Lazović, Ivan and Stevanović, Žarko M. and Jovašević-Stojanović, Milena and Živković, Marija M. and Banjac, Miloš J.",
year = "2016",
abstract = "Previous studies have shown that poorly ventilated classrooms can have negative impact on the health of children and school staff. In most cases, schools in Serbia are ventilated naturally. Considering their high occupancy, classroom air quality test determines the level of air pollution, after which it is possible to implement corrective measures. The research presented in this study, was conducted in four schools which are located in different areas and have different architecture designs. Measurements in these schools have been performed during the winter (heating season) and spring (non-heating season) and the following results were presented: indoor air temperature, relative humidity, and carbon dioxide concentration. These results show that the classroom average concentration of carbon dioxide often exceeds the value of 1500 ppm, during its full occupancy, which indicates inadequate ventilation. Measurement campaigns show that carbon dioxide concentration increased significantly from non-heating to heating season in three of the four schools. Analysis of measurements also determined high correlation between relative humidity and carbon dioxide concentration in all schools in winter season. This fact may constitute a solid basis for the fresh air supply strategy.",
journal = "Thermal Science",
title = "Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia",
volume = "20",
pages = "S297-S307",
doi = "10.2298/TSCI150831173L"
}
Lazović, I., Stevanović, Ž. M., Jovašević-Stojanović, M., Živković, M. M.,& Banjac, M. J.. (2016). Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia. in Thermal Science, 20, S297-S307.
https://doi.org/10.2298/TSCI150831173L
Lazović I, Stevanović ŽM, Jovašević-Stojanović M, Živković MM, Banjac MJ. Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia. in Thermal Science. 2016;20:S297-S307.
doi:10.2298/TSCI150831173L .
Lazović, Ivan, Stevanović, Žarko M., Jovašević-Stojanović, Milena, Živković, Marija M., Banjac, Miloš J., "Impact of Co2 Concentration on Indoor Air Quality and Correlation with Relative Humidity and Indoor Air Temperature in School Buildings in Serbia" in Thermal Science, 20 (2016):S297-S307,
https://doi.org/10.2298/TSCI150831173L . .
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Fluid Bed Drying as Upgrading Technology for Feasible Treatment of Kolubara Lignite

Erić, Milić D.; Stakic, Milan B.; Banjac, Miloš J.

(2016)

TY  - JOUR
AU  - Erić, Milić D.
AU  - Stakic, Milan B.
AU  - Banjac, Miloš J.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1142
AB  - An overview of the current status of low-rank coal upgrading technologies is presented in the paper, particularly with respect to drying and dewatering procedures. In order to calculate the significant parameters of the moisture removal process, a model of convective coal drying in a fluid bed, based on the two-phase (bubbling) fluidization model proposed by Kunii and Levenspiel, is developed and presented. Product-specific data (intraparticle mass transfer, gas-solid moisture equilibrium) related to the particular coal variety addressed here (Kolubara lignite) are obtained through preliminary investigations. Effective thermal conductivity of the packed bed as defined by Zehner/Bauer/Schlunder is used to define heat transfer mechanisms occurring in the suspension phase of the fluid bed. A completely new set of experimental data obtained has been successfully used to validate the model additionally.
T2  - Thermal Science
T1  - Fluid Bed Drying as Upgrading Technology for Feasible Treatment of Kolubara Lignite
VL  - 20
SP  - S167
EP  - S181
DO  - 10.2298/TSCI150725172E
ER  - 
@article{
author = "Erić, Milić D. and Stakic, Milan B. and Banjac, Miloš J.",
year = "2016",
abstract = "An overview of the current status of low-rank coal upgrading technologies is presented in the paper, particularly with respect to drying and dewatering procedures. In order to calculate the significant parameters of the moisture removal process, a model of convective coal drying in a fluid bed, based on the two-phase (bubbling) fluidization model proposed by Kunii and Levenspiel, is developed and presented. Product-specific data (intraparticle mass transfer, gas-solid moisture equilibrium) related to the particular coal variety addressed here (Kolubara lignite) are obtained through preliminary investigations. Effective thermal conductivity of the packed bed as defined by Zehner/Bauer/Schlunder is used to define heat transfer mechanisms occurring in the suspension phase of the fluid bed. A completely new set of experimental data obtained has been successfully used to validate the model additionally.",
journal = "Thermal Science",
title = "Fluid Bed Drying as Upgrading Technology for Feasible Treatment of Kolubara Lignite",
volume = "20",
pages = "S167-S181",
doi = "10.2298/TSCI150725172E"
}
Erić, M. D., Stakic, M. B.,& Banjac, M. J.. (2016). Fluid Bed Drying as Upgrading Technology for Feasible Treatment of Kolubara Lignite. in Thermal Science, 20, S167-S181.
https://doi.org/10.2298/TSCI150725172E
Erić MD, Stakic MB, Banjac MJ. Fluid Bed Drying as Upgrading Technology for Feasible Treatment of Kolubara Lignite. in Thermal Science. 2016;20:S167-S181.
doi:10.2298/TSCI150725172E .
Erić, Milić D., Stakic, Milan B., Banjac, Miloš J., "Fluid Bed Drying as Upgrading Technology for Feasible Treatment of Kolubara Lignite" in Thermal Science, 20 (2016):S167-S181,
https://doi.org/10.2298/TSCI150725172E . .
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Cfd Simulations of Thermal Comfort in Naturally Ventilated Primary School Classrooms

Stevanović, Žana; Ilic, Gradimir S.; Vukic, Mica V.; Živković, Predrag M.; Blagojevic, Bratislav D.; Banjac, Miloš J.

(2016)

TY  - JOUR
AU  - Stevanović, Žana
AU  - Ilic, Gradimir S.
AU  - Vukic, Mica V.
AU  - Živković, Predrag M.
AU  - Blagojevic, Bratislav D.
AU  - Banjac, Miloš J.
PY  - 2016
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/1151
AB  - The purpose of thermal comfort is to speck the combinations of indoor space environment and personal factors that will produce thermal environment conditions acceptable to 80% or more of the occupants within a space. Naturally ventilated indoors has a very complex air movement, which depends on numerous variables such as: outdoor interaction, intensity of infiltration, the number of openings, the thermal inertia of walls, occupant behaviors, etc. The most important mechanism for naturally ventilated indoors is the intensity of infiltration and thermal buoyancy mechanism. In this study the objective was to determine indicators of thermal comfort for children, by the CFD model based on experimental measurements with modification on turbulent and radiant heat transfer mathematical model. The case study was selected on school children of 8 and 9 years in France Presern primary school in Belgrade. The purpose was to evaluate the relationships between the indoor environment and the subjective responses. Also there was analysis of infiltration and stack effect based on meteorological data on site. The main parameters that were investigated are: operative temperature, radiant temperature, concentration of CO2, and air velocity. The new correction of turbulence and radiative heat transfer models has been validated by comparison with experimental data using additional statistical indicators. It was found that both turbulence model correct and the new radiative model of nontransparent media have a significant influence on CFD data set accuracy.
T2  - Thermal Science
T1  - Cfd Simulations of Thermal Comfort in Naturally Ventilated Primary School Classrooms
VL  - 20
SP  - S287
EP  - S296
DO  - 10.2298/TSCI150414171S
ER  - 
@article{
author = "Stevanović, Žana and Ilic, Gradimir S. and Vukic, Mica V. and Živković, Predrag M. and Blagojevic, Bratislav D. and Banjac, Miloš J.",
year = "2016",
abstract = "The purpose of thermal comfort is to speck the combinations of indoor space environment and personal factors that will produce thermal environment conditions acceptable to 80% or more of the occupants within a space. Naturally ventilated indoors has a very complex air movement, which depends on numerous variables such as: outdoor interaction, intensity of infiltration, the number of openings, the thermal inertia of walls, occupant behaviors, etc. The most important mechanism for naturally ventilated indoors is the intensity of infiltration and thermal buoyancy mechanism. In this study the objective was to determine indicators of thermal comfort for children, by the CFD model based on experimental measurements with modification on turbulent and radiant heat transfer mathematical model. The case study was selected on school children of 8 and 9 years in France Presern primary school in Belgrade. The purpose was to evaluate the relationships between the indoor environment and the subjective responses. Also there was analysis of infiltration and stack effect based on meteorological data on site. The main parameters that were investigated are: operative temperature, radiant temperature, concentration of CO2, and air velocity. The new correction of turbulence and radiative heat transfer models has been validated by comparison with experimental data using additional statistical indicators. It was found that both turbulence model correct and the new radiative model of nontransparent media have a significant influence on CFD data set accuracy.",
journal = "Thermal Science",
title = "Cfd Simulations of Thermal Comfort in Naturally Ventilated Primary School Classrooms",
volume = "20",
pages = "S287-S296",
doi = "10.2298/TSCI150414171S"
}
Stevanović, Ž., Ilic, G. S., Vukic, M. V., Živković, P. M., Blagojevic, B. D.,& Banjac, M. J.. (2016). Cfd Simulations of Thermal Comfort in Naturally Ventilated Primary School Classrooms. in Thermal Science, 20, S287-S296.
https://doi.org/10.2298/TSCI150414171S
Stevanović Ž, Ilic GS, Vukic MV, Živković PM, Blagojevic BD, Banjac MJ. Cfd Simulations of Thermal Comfort in Naturally Ventilated Primary School Classrooms. in Thermal Science. 2016;20:S287-S296.
doi:10.2298/TSCI150414171S .
Stevanović, Žana, Ilic, Gradimir S., Vukic, Mica V., Živković, Predrag M., Blagojevic, Bratislav D., Banjac, Miloš J., "Cfd Simulations of Thermal Comfort in Naturally Ventilated Primary School Classrooms" in Thermal Science, 20 (2016):S287-S296,
https://doi.org/10.2298/TSCI150414171S . .
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Numerical Study on Hygroscopic Material Drying in Packed Bed

Stakic, M.; Banjac, Miloš J.; Urosevic, T.

(2011)

TY  - JOUR
AU  - Stakic, M.
AU  - Banjac, Miloš J.
AU  - Urosevic, T.
PY  - 2011
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/4330
AB  - The paper addresses numerical simulation for the case of convective drying of hygroscopic material in a packed bed, analyzing agreement between the simulated and the corresponding experimental results. In the simulation model of unsteady simultaneous one-dimensional heat and mass transfer between gas phase and dried material, it is assumed that the gas-solid interface is at thermodynamic equilibrium, while the drying rate of the specific product is calculated by applying the concept of a drying coefficient. Model validation was clone on the basis of the experimental data obtained with potato cubes. The obtained drying kinetics, both experimental and numerical, show that higher gas (drying agent) velocities (flow-rates), as well as lower equivalent grain diameters, induce faster drying. This effect is more pronounced for deeper beds, because of the larger amount of wet material to be dried using the same drying agent capacity.
T2  - Brazilian Journal of Chemical Engineering
T1  - Numerical Study on Hygroscopic Material Drying in Packed Bed
VL  - 28
IS  - 2
SP  - 273
EP  - 284
DO  - 10.1590/S0104-66322011000200012
ER  - 
@article{
author = "Stakic, M. and Banjac, Miloš J. and Urosevic, T.",
year = "2011",
abstract = "The paper addresses numerical simulation for the case of convective drying of hygroscopic material in a packed bed, analyzing agreement between the simulated and the corresponding experimental results. In the simulation model of unsteady simultaneous one-dimensional heat and mass transfer between gas phase and dried material, it is assumed that the gas-solid interface is at thermodynamic equilibrium, while the drying rate of the specific product is calculated by applying the concept of a drying coefficient. Model validation was clone on the basis of the experimental data obtained with potato cubes. The obtained drying kinetics, both experimental and numerical, show that higher gas (drying agent) velocities (flow-rates), as well as lower equivalent grain diameters, induce faster drying. This effect is more pronounced for deeper beds, because of the larger amount of wet material to be dried using the same drying agent capacity.",
journal = "Brazilian Journal of Chemical Engineering",
title = "Numerical Study on Hygroscopic Material Drying in Packed Bed",
volume = "28",
number = "2",
pages = "273-284",
doi = "10.1590/S0104-66322011000200012"
}
Stakic, M., Banjac, M. J.,& Urosevic, T.. (2011). Numerical Study on Hygroscopic Material Drying in Packed Bed. in Brazilian Journal of Chemical Engineering, 28(2), 273-284.
https://doi.org/10.1590/S0104-66322011000200012
Stakic M, Banjac MJ, Urosevic T. Numerical Study on Hygroscopic Material Drying in Packed Bed. in Brazilian Journal of Chemical Engineering. 2011;28(2):273-284.
doi:10.1590/S0104-66322011000200012 .
Stakic, M., Banjac, Miloš J., Urosevic, T., "Numerical Study on Hygroscopic Material Drying in Packed Bed" in Brazilian Journal of Chemical Engineering, 28, no. 2 (2011):273-284,
https://doi.org/10.1590/S0104-66322011000200012 . .
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Size Distribution of Agglomerates of Milk Powder in Wet Granulation Process in a Vibro-Fluidized Bed

Banjac, Miloš J.; Stamenic, M.; Lecic, M.; Stakic, M.

(2009)

TY  - JOUR
AU  - Banjac, Miloš J.
AU  - Stamenic, M.
AU  - Lecic, M.
AU  - Stakic, M.
PY  - 2009
UR  - http://vinar.vin.bg.ac.rs/handle/123456789/3775
AB  - Results of experiments on the influence of technological parameters (intensity of vibration, granulation of the liquid feed, temperature of fluidization agent) on the change of size distribution, as well as mass mean diameter of the milk powder particles subjected to the wet granulation process (agglomeration) in a vibro-fluidized bed granulator are shown in this paper. Using water as a granulation liquid and air as a fluidization agent, it was found that mass mean diameter increases with increase of water feed, intensity of vibration, and decrease of air temperature. Increasing the intensity of vibration and decreasing the air temperature, primarily induces the increase of the dimensions of the initial nuclei. This can be explained on the basis of different influences that these changes (velocity of particle motion, intensity of particle collision, drying rate) have on the coalescence of particles with smaller and/or bigger dimensions.
T2  - Brazilian Journal of Chemical Engineering
T1  - Size Distribution of Agglomerates of Milk Powder in Wet Granulation Process in a Vibro-Fluidized Bed
VL  - 26
IS  - 3
SP  - 515
EP  - 525
DO  - 10.1590/S0104-66322009000300007
ER  - 
@article{
author = "Banjac, Miloš J. and Stamenic, M. and Lecic, M. and Stakic, M.",
year = "2009",
abstract = "Results of experiments on the influence of technological parameters (intensity of vibration, granulation of the liquid feed, temperature of fluidization agent) on the change of size distribution, as well as mass mean diameter of the milk powder particles subjected to the wet granulation process (agglomeration) in a vibro-fluidized bed granulator are shown in this paper. Using water as a granulation liquid and air as a fluidization agent, it was found that mass mean diameter increases with increase of water feed, intensity of vibration, and decrease of air temperature. Increasing the intensity of vibration and decreasing the air temperature, primarily induces the increase of the dimensions of the initial nuclei. This can be explained on the basis of different influences that these changes (velocity of particle motion, intensity of particle collision, drying rate) have on the coalescence of particles with smaller and/or bigger dimensions.",
journal = "Brazilian Journal of Chemical Engineering",
title = "Size Distribution of Agglomerates of Milk Powder in Wet Granulation Process in a Vibro-Fluidized Bed",
volume = "26",
number = "3",
pages = "515-525",
doi = "10.1590/S0104-66322009000300007"
}
Banjac, M. J., Stamenic, M., Lecic, M.,& Stakic, M.. (2009). Size Distribution of Agglomerates of Milk Powder in Wet Granulation Process in a Vibro-Fluidized Bed. in Brazilian Journal of Chemical Engineering, 26(3), 515-525.
https://doi.org/10.1590/S0104-66322009000300007
Banjac MJ, Stamenic M, Lecic M, Stakic M. Size Distribution of Agglomerates of Milk Powder in Wet Granulation Process in a Vibro-Fluidized Bed. in Brazilian Journal of Chemical Engineering. 2009;26(3):515-525.
doi:10.1590/S0104-66322009000300007 .
Banjac, Miloš J., Stamenic, M., Lecic, M., Stakic, M., "Size Distribution of Agglomerates of Milk Powder in Wet Granulation Process in a Vibro-Fluidized Bed" in Brazilian Journal of Chemical Engineering, 26, no. 3 (2009):515-525,
https://doi.org/10.1590/S0104-66322009000300007 . .
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