Dimitrovski, Dame

Preferred name

Dimitrovski, Dame

Official Name

Dimitrovski, Dame

Main Affiliation

dame.dimitrovski@mf.edu.mk

Now showing 1 - 9 of 9

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Analysis of the factors influencing coefficients of pm10 emissions from household heating in Skopje region, International journal of ecosystems and ecology science
(2018)
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Sapuric, Zoran
This article provides general information about the air pollution in the Skopje valley, its geographical, climatic and meteorological conditions, that contribute to high concentrations of PM10 and PM2,5 in the city, especially during the heating season. The measuring network shows that PM10 concentrations in all measuring point in the city of Skopje is drastically above the limit of 50µg/m3 , with accident reaching value up to 1000µg/m3 . Part of this research is done by conducting a survey on 5044 households in 17 municipalities of the Skopje plan region, with analysis of the type of system they use for heating the household, the surface area of the object they live in, the part of the object they heat during the winter (heating season), the fuel they use or source of energy for heating, and the amount of fuel for one heating season. The analysis of the type of wood fuels used within a the region of Skopje include proportional (percentage) breakdown of the typical types of wood (oak, spruce, pine, etc) and nature of equipment in use (age), maintenance patterns and frequency of wood, the emission factor for PM10 is calculated and proposed that can be used in further TIER1 calculations
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Binary Co-generation Power Plant with SOFC – environmental aspects
(Balkan Environmental Association (B.EN.A.), 2016)
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In this paper are analysed the ecological aspects in regard of the application of binary cogenerative power plants with solid oxide fuel cells (BCFC). The BCFC are combined co-generative power plants with fuel cells, gas and steam co-generative power plants, which are considered as high efficiency power plants. It is proposed optimisation methodology according to which is developed and verified an optimisation software. As leading optimisation criteria is chosen the maximal efficiency of the analysed power plant. In the paper are presented many calculation results from the software which are relating to energy, ecological and economical characteristics for this kind of power plants. The obtained results are analysed in regard of ecological aspects such as pollutant emissions depending from the fuel type. Comparison is performed between the results (ecological parameters) of BCFC with and without fuel cells. According the analyses of the results, conclusions are drawn which justifies the advantages in implementation on this kind of power plants
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Possibilities for improving energy efficiency in industry sector utilizing low temperature waste heat recovery
(Balkan Environmental Association (B.EN.A.), 2018)
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The energy efficiency in the industry sector is a strong and leading factor for the competitiveness on the domestic and foreign markets. In this paper are analysed the possibilities for improving energy efficiency in the industry sector by utilising low temperature waste heat recovery (LTWHR). As a waste heat it is considered the energy that is generated in industrial processes without being put to practical use. The focus in the analysis is placed on the Organic Rankine Cycle technology for utilising LTWHR as a competitive technology for the energy sources where neither gas nor steam cycles offer a technically and/or economically viable solution to generate electric power or other useful energy transformation. Also it is given brief overview of the cycle configurations that are commonly used or proposed in the literature for this kind of applications. Within the analysis is covered waste heat recovery from the exhaust gases from hot water boilers, steam boilers and combined heat and power units
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A model for techno-economic optimization and environmental sustainability of the heating structure in an urban area
(Društvo termičara Srbije, 2017)
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The objective of the present work is to conduct techno-economic evaluation of different available methods and types of heating in urban areas, having in the forefront the impact on the environment. Several important aspects have been envisaged within the analysis: technical feasibility, investment costs, operating and maintenance costs, as well as the environmental impact assessment. The main goal of the work is to provide reliable information and indicators for selection of optimal sustainable type of heating in the city of Skopje as a major urban area. The actual situation in terms of air pollution in Skopje has been briefly outlined. The current situation regarding the ways of thermal energy supply for heating in Skopje is presented. A complex mathematical model has been applied for the purposes of a comparative analysis between different heating methods, that takes into consideration the necessary techno-economic and environmental aspects of the heating methods and systems. Furthermore, the model has been adapted and applied as for the conditions of the city of Skopje, offering a strong guidelines for selection of the best way of heating in different parts of the city, depending on the local urban, infrastructural, technical and environmental conditions. The results show a significant advantage of the central heating system in relation to the other types of heating, from engineering, financial and environmental viewpoint.
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Optimisation of Heating Structure in Urban Areas
(Faculty of Mechanical Engineering in Nis, 2017-10)
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The present work deals with optimization model for selection of optimal heating structure in urban areas also considering the environmental aspects. Optimization model was developed, aiming to facilitate the decision making during selection phase of heat sources locations and defining the boundaries of their action at the pre-design phase of heat supply schemes development of settlements. Within the model is performed comparative analysis between ten heating systems, whereas as leading criteria in the comparison procedure are considered heat load density per unit of area, techno-economic aspects and environmental impact. The optimization result actually defines the optimal heating system type in regard of the value for the heat load density per unit area. The model provides possibility in defining standard values of heat density indicators, according to which can be assessed the economic feasibility of implementing district heating system for the selected urban area. The less value of heat density in the system, the higher specific costs for generation, distribution and transmission of heat energy. Furthermore the model is applied and verified for the local urban, infrastructural, technical and environmental conditions for the city of Skopje. Determination process of optimal heating structure has holistic approach, where beside techno-economic aspects and feasibility the environmental aspect of different heating systems is considered as a major factor (threat) in air pollution.
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Environmental benefits from optimisation of sustainable heating systems in Skopje
(Balkan Environmental Association (B.EN.A.), 2017)
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Main aspect and contribution of this paper is in obtaining relevant information and indicators on the environmental picture of the city of Skopje in regard of defined techno-economic optimum type of heating for specific regions of a larger urban area. Environmental benefits of the techno-economic approach are presented from the analysis of different methods and types of heating in urban areas, i.e. current and potential (possible) heating systems in Skopje. To meet the goal, a complex software package is developed used for optimisation of the heating structure in Skopje, composed of several sub-programs for analysing the energy, economic and environmental characteristics of the different heating systems implemented in each of the regions mapped for the urban area of Skopje. The obtained results from the defined techno-economic optimum model for heating and anticipated implementation plan indicate that there will be significant improvement in the pollution in Skopje in a relatively short period.
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Apple quality preservation with the use of intermittent drying process
(Balkan Environmental Association (B.EN.A.), 2018)
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During the fruit drying, the processes of heat transfer and mass transfer occur simultaneously in the dried product. To preserve the fresh fruit quality or even to improve some of its nutrition characteristics, discontinuous heat input is used in the proposed intermittent drying process. The pause, in the heat supply, provides enough time for moisture diffusion within the material. Existing food drying theory can not be sufficient for specifying the intermittent drying regime. In the industrial environment, in which this research is conducted, true intermittent drying process is searched through tests at relevant drying conditions. Intermittent drying process is studied by tempering apple rings during air drying. The investigation was performed using a three-level industrial type dryer. Multi-thermal zone convective drying process is applied, with different intermittent regimes, on three identical continuous flow dryers. The influence of air state (temperatures 35-85oC, velocities 2-5 m/s) and drying intensity (5-10 h per cycle) on dried product quality is evaluated through field work tests at three simultaneously operating plants. Correct drying conditions are reached.
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The effect of the heat flow amount and continuity on dried rice quality
(Faculty of Mechanical Engineering, Ss. Cyril and Methodius University in Skopje, Republic of North Macedonia, 2020)
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A research was conducted through field tests on mixed-flow rice dryer. The realization of the planned study was carried out by applying intermittent system of drying and selection of correct drying conditions. The heat flow amount and continuity were observed and evaluated in multi-thermal zoned drying process. Hot air temperatures, up to 45 oC, were used. Paddy from local rice varieties, with the initial moisture content, wet basis, up to 26 %, was processed to the desirable final moisture content, from 8% to 12%. Reached at three levels, the final moisture content depends on intended rice use: 1) for sale, 2) for one year storage and 3) for five years storage. The effect of drying air temperature level, heat flow intensity and retention time duration on dried paddy quality was analyzed.
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ETHICAL DILEMMAS OF RENEWABLE ENERGY
(University Ss. Cyril and Methodius in Skopje, 2022-12)
Uler-Zefikj, Monika
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Manev, Nikola
The world economic growth leads to increased energy needs that have to be satisfied with higher electricity production from both conventional and renewable energy sources. Due to the reduced fossil fuel stocks as well as environmental pollution caused by conventional power plants priority is given to the expansion of renewable energy sources. Motivated by the need to study the competitiveness, eco-friendliness and reliability of renewable en-ergy, research was conducted on the effect different energy types have on the environment, population, and economy. The aim of this paper is to analyze the ethical dilemmas of renewable energy as constraints for increasing the renewable energy share in the electricity generation and replacement of fossil fuels, considering the production process intensive-ness, noble materials depletion, and climate change caused. The extensive analysis showed that although renewable energy is in principle clean and inexhaustible energy source, it can cause burdens on nature and society.

Dimitrovski, Dame

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