Tashevski, Done
Preferred name
Tashevski, Done
Official Name
Tashevski, Done
Main Affiliation
Email
done.tashevski@mf.edu.mk
16 results
Now showing 1 - 10 of 16
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Item type:Publication, Analysis of the factors influencing coefficients of pm10 emissions from household heating in Skopje region, International journal of ecosystems and ecology science(2018); ; ; Sapuric, ZoranThis 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 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Energy efficiency in complex buildings(IOP Publishing, 2020-01-24); ; Thermal energy performance of a certain building refers to the process of modelling the energy transfer between the building and its surroundings. The objective of the present work was to analyze the energy performances of complex buildings in terms of energy efficiency. Healthcare buildings are a typical example of complex objects, both from a construction and from a thermo-technical aspect, since they usually need heat and cold generation and distribution systems and facilities. For the purpose of the present analysis, a complex consisting of 16 hospital buildings has been evaluated from the energy efficiency viewpoint. Numerical simulation has been conducted to identify the baseline energy consumption of the considered healthcare buildings. The data have been further processed for analysis and comparison of baseline scenario with the scenario for energy efficient renovated buildings. The results from the analysis show that energy efficient complex healthcare buildings may reach operation energy savings up to 50% compared to baseline situation where the buildings are operating with inefficient heating and electrical systems. The investments simple payback period of the proposed energy efficiency measures is between 5-6 years. Implementation of renewable energy system for sanitary hot water preparation, might address issues related to energy security, i.e. dependency on the energy imports by reducing expenditures on energy, as well as might reduce the consequent environmental impact. The results of the energy efficiency measures implementation in the considered healthcare buildings show significant improvements, resulting with lower energy cost for the buildings, reduction of fossil fuels use and reduction of CO2 emissions up to 45%. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Binary Co-generation Power Plant with SOFC – environmental aspects(Balkan Environmental Association (B.EN.A.), 2016); ; 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 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Possibilities for improving energy efficiency in industry sector utilizing low temperature waste heat recovery(Balkan Environmental Association (B.EN.A.), 2018); ; ; 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 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A model for techno-economic optimization and environmental sustainability of the heating structure in an urban area(Društvo termičara Srbije, 2017); ; ; ; 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Performance evaluation of micro orc systems for power generation in nearly zero energy buildings (NZEB)(Faculty of mechanical engineering, University of Banja Luka, 2019-05); ; According the Energy Performance of Buildings Directive it is required all new buildings to be nearly zero-energy by the end of 2020. Micro cogeneration systems are considered as one of the system solutions with the highest potential to enable nearly zero energy buildings (nZEB). In this paper is assessed the potential for application of Micro-Organic Rankine Cycle system for power generation in nZEB, where as a heat source is considered solar energy (solar thermal collectors) biomass (pellet boiler), which are also integrated part of the heating system and DHW. Analysis is performed in order to select optimal ORC working fluid for highest thermal efficiency. The solar thermal system, building, heating/cooling and DHW systems are modeled with Transient System Simulation Tool (TRNSYS) and for the meteorological data is used Typical Meteorological Year for Macedonia. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Heat transfer between heated, partially heated and non-heated residential units in buildings(IOP Publishing, 2020-01-24); ; Space heating cost allocation according to actual consumption can be one possible motivating factor for saving energy in residential and other buildings. As a consequence of the exclusion of a certain number of users in collective housing units from the central heating supply system in the city of Skopje, the problem of heating cost allocation and collection of the fixed part of the heat energy payment has arosen. The subject of the analysis in this study was the heat transfer in buildings, with the main focus on the issue of heat transfer rate between residential units with different internal temperatures, such as from heated to unheated or partly heated apartments in collective building objects. The purpose of the analysis was to assess the mutual energy interaction between the completely or partially excluded apartments from the central heating system and the adjacent apartments connected to the central heating system. This is done by simulating the thermal characteristics of typical buildings that are representatives of new (insulated) and old (un-insulated) buildings. For the simulation purposes, the external average daily and monthly temperatures were obtained based on the perennial outdoor temperatures measured in Skopje and additional series of input data that are characteristic for the city were used. For the value of the internal temperature in the dwellings the value for the standard internal design temperatures are predefined. As results of the simulation, values were obtained for the annual heat gains (in kWh/year) and the specific heat gains (in kWh/m2year) of the excluded apartments from the system of central heating through the enclosures (internal walls, ceiling and floor) of the adjacent apartments that are connected to the system for central heating and vertical hot water pipelines for an isolated and nonisolated buildings. In order to obtain a clearer picture, in the study are considered different configurations and positions of apartments in the building. As an indicator for each considered apartment, the ratio of the received thermal energy of the disconnected apartment to the required energy for its heating is calculated. Based on the obtained results, appropriate conclusions were drawn regarding the reduction of the necessary energy for heating of the excluded apartments, as a consequence of the thermal gains through the walls of the neighboring apartments that are connected to the heating system. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Required parameters in the thermal processes conducted for rice quality improvement(Faculty of Mechanical Engineering Skopje, 2017); ; An investigation was realized to obtain information on paddy parboiling conditions and parboiled rice drying conditions. Parameters required in the processes of paddy thermal treatment were reviewed and compared with research results. Field tests on parboiling autoclaves and mixed-flow rice dryer were made at the parboiling rice factory in Kočani. Three autoclaves with functional capacity of 3000 kg paddy/h and one mixed-flow parboiled rice dryer with capacity of 2500 kg parboiled rice/h were included in the examination. The paddy behavior in the parboiling process was controlled by measurements. The processes of paddy soaking in hot water, steaming, pre-drying, milling and parboiled rice drying were included in the measuring programme. The study was conducted on three local paddy varieties, Monticelli, Saint Andrew and RS76. The range of the required parameters for the processes of paddy parboiling and parboiled rice drying was determined - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Optimisation of Heating Structure in Urban Areas(Faculty of Mechanical Engineering in Nis, 2017-10); ; ; 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. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Environmental benefits from optimisation of sustainable heating systems in Skopje(Balkan Environmental Association (B.EN.A.), 2017); ; ; 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.