Title
Istraživanje prostorne uniformnosti indikatora toplotnog komfora u zgradama : doktorska disertacija
Creator
Stevanović, Žana Ž.
Copyright date
2015
Object Links
Select license
Autorstvo-Nekomercijalno-Bez prerade 3.0 Srbija (CC BY-NC-ND 3.0)
License description
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Language
Serbian
Cobiss-ID
Theses Type
PhD thesis
Other responsibilities
mentor
Ilić, Gradimir
član komisije
Blagojević, Bratislav
član komisije
Vukić, Mića. 1965-
član komisije
Živković, Predrag. 1975-
član komisije
Banjac, Miloš. 1968-
Academic Expertise
Prirodno-matematičke nauke
Academic Title
-
University
Univerzitet u Nišu
Faculty
Mašinski fakultet
Group
Katedra za termotehniku, termoenergetiku i procesnu tehniku
Publisher
Niš : [Ž. Ž. Stevanović]
Format
PDF/A (148 listova)
description
Umnoženo za odbranu.
Univerzitet u Nišu, Mašinski fakultet, 2015.
Bibliografija: listovi 141-143.
Rezime ; Abstract.
Abstract (en)
The research presented in this PhD thesis is directly linked to the achievement of sustainable
building development analysis of indoor environment quality. The indoor environment quality
includes the achieved level of heat, air, light, noise and aesthetic comfort.
In the presented PhD thesis, special attention was paid to thermal comfort. Fundamental
processes of mass, momentum and heat transfer are used to describe the various mechanisms
of sensible and latent heat transfer from the human being to the environment and vice versa.
The investigations were conducted by experimental, numerical and statistical methods.
While investigating within PhD thesis, the following scientific contributions have been made:
- Concerning the two-equation turbulence models, special attention was paid to the
influence of production and dissipation terms of turbulent kinetic energy due to the
fluctuation of body forces.
- Varying empirical constants containing modeled terms of the differential equation for ε,
the modifications were proposed for the empirical constant C 3 in the way that its value
is declared variable as a function of the ratio of flow velocity component in the direction
of the gravity vector and lateral directions, and an expression for its determination is
proposed.
- Concerning the heat transfer radiation model, the new model of radiation have been
proposed that treats air contaminated by carbon dioxide as a nontransparent medium, and
an expression is proposed in order to determine the effective emissivity of contaminated
air.
The experimentally obtained values of the general thermal comfort indicators were the basis
for the validation of the mathematical models proposed in the presented PhD dissertation.
The proposed models are built into a numerical code of the commercial software PHOENICS,
and parametric analysis was conducted through a series of six test cases, starting from the
basic model, which is characterized by the fact that the turbulent model and heat transfer by
radiation model are built-in, up to the case C_B which includes both modifications.
In addition to the standard procedure of error analysis, statistical analysis of a complex array
has been conducted, so additional statistical indicators have given the right information about
the each model quality.
Based on the results of the numerical experiments, it was shown that the model of radiation
compared to the turbulence model in the distribution of thermal characteristics and general
thermal comfort indicators has a dominant role.
Authors Key words
Toplotni komfor, prirodna ventilacija, prenos toplote, turbulentni modeli, model netransparentnog medijuma zračenja, PMV-PPD
Authors Key words
Thermal comfort, natural ventilation, turbulence models, nontransparent media
model of radiation, PMV-PPD
Classification
697.1
Subject
536.24
Type
Elektronska teza
Abstract (en)
The research presented in this PhD thesis is directly linked to the achievement of sustainable
building development analysis of indoor environment quality. The indoor environment quality
includes the achieved level of heat, air, light, noise and aesthetic comfort.
In the presented PhD thesis, special attention was paid to thermal comfort. Fundamental
processes of mass, momentum and heat transfer are used to describe the various mechanisms
of sensible and latent heat transfer from the human being to the environment and vice versa.
The investigations were conducted by experimental, numerical and statistical methods.
While investigating within PhD thesis, the following scientific contributions have been made:
- Concerning the two-equation turbulence models, special attention was paid to the
influence of production and dissipation terms of turbulent kinetic energy due to the
fluctuation of body forces.
- Varying empirical constants containing modeled terms of the differential equation for ε,
the modifications were proposed for the empirical constant C 3 in the way that its value
is declared variable as a function of the ratio of flow velocity component in the direction
of the gravity vector and lateral directions, and an expression for its determination is
proposed.
- Concerning the heat transfer radiation model, the new model of radiation have been
proposed that treats air contaminated by carbon dioxide as a nontransparent medium, and
an expression is proposed in order to determine the effective emissivity of contaminated
air.
The experimentally obtained values of the general thermal comfort indicators were the basis
for the validation of the mathematical models proposed in the presented PhD dissertation.
The proposed models are built into a numerical code of the commercial software PHOENICS,
and parametric analysis was conducted through a series of six test cases, starting from the
basic model, which is characterized by the fact that the turbulent model and heat transfer by
radiation model are built-in, up to the case C_B which includes both modifications.
In addition to the standard procedure of error analysis, statistical analysis of a complex array
has been conducted, so additional statistical indicators have given the right information about
the each model quality.
Based on the results of the numerical experiments, it was shown that the model of radiation
compared to the turbulence model in the distribution of thermal characteristics and general
thermal comfort indicators has a dominant role.
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