Zvonimir Guzovi'c

Zvonimir Guzovi'c
University of Zagreb

PhD

About

67
Publications
7,186
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
732
Citations

Publications

Publications (67)
Article
Today, coal is responsible for 40% of annual CO2 emissions. At the same time, global warming causes climate changes accompanied with catastrophic meteorological phenomena all over the world. After the 2015 Paris Agriment many countries set ambitious energy policy to reduce the annual greenhouse gas emission. The 2021 UN Climate Change Conference, C...
Article
Design methods and concepts that can increase the energy conversion efficiency of marine and river current turbines are of great importance for the development and wider utilization of this emerging renewable energy technology. This work is aimed to improve hydrodynamic performances of the hydrokinetic turbines to get as close as possible to the th...
Article
Following the 2015 Paris Agreement and other agreements which have been signed after, sustainable energy development is becoming the major goal in many countries. EU have set the targets to reduce the annual greenhouse gas emission by 40% in 2030 and 80% for 2050 compared with 1990 levels. For achieving this ambitious energy policy, three major tec...
Article
The expander is the key element of an organic Rankine cycle (ORC) and has a significant influence on the cycle efficiency. Therefore, in this study, an innovative small axial multistage turbine with partial admission for a bottoming ORC (ORBC) is investigated. The ORBC was used for the waste heat utilization of exhaust gases and jacket cooling wate...
Article
Production systems represent a significant source of waste heat. The waste heat cannot be reused often. Many optimization methods can give a solution for waste heat recovery. However, the results do not depend only on the method. The low-temperature waste heat makes difficulties for its recovery within the processes. Organic Rankine Cycle units can...
Article
Full-text available
The widespread use of fossil fuels and their limitation leads to find other sources of energy. Solar thermal energy is a possible solution. There are many projects that use renewable energy. Solar thermal energy can be easily used for heating. However, there are problems in the efficiency of solar collectors, the loss of heat, the consistency of he...
Article
Full-text available
This editorial provides an overview of twenty scientific articles published in the special issue of Thermal Science. The papers were selected from among 601 contributions presented at the 14th Conference on Sustainable Development of Energy, Water and Environment Systems (SDEWES 2019), held October 1-6, 2019 in the city of Dubrovnik, Croatia. The t...
Conference Paper
Full-text available
Recently exist a trend of using solar heat to meet the need for heat in production processes. Each manufacturing process generates a certain amount of waste heat that can be reused. Minimising waste heat in the system is crucial for optimal design of the solar thermal system. In some periods the heat generated from the processes and excess heat fro...
Conference Paper
There are numerous ways to recover heat and improve energy efficiency in production systems. Recently, Rankine cycle is very exploited for heat recovery with transformation of thermal energy into electricity. It allows use low temperature heat sources. That is enabled with use of specific organic compounds as working fluids. This cycle is named as...
Article
The environmental impact of the energy sector and the security and economics of energy supply and utilisation have been raising increasing concerns, stimulating the search for innovative solutions for a sustainable use of resources. This article provides an overview of published research in this area, with a focus on papers contributed in special i...
Conference Paper
Since energy consumption represents 40-60% of oil refinery total operational costs, energy efficiency has been recognized as a highly-influential factor for refinery production profitability margins. Importance of rational energy use has also been recognized by EU directives and National action plans for energy efficiency of individual country memb...
Conference Paper
Wide and limited use of fossil fuels leads to find replacement with other energy sources. Solar thermal energy is one of the possible solutions. There are many projects that have studied renewable energy sources. The renewables have many advantages, but also numerous disadvantages. Solving of the disadvantages is the key to successful use of fuels...
Article
Climate change and fossil fuel reserve depletion both pose challenges for energy security and for wellbeing in general. The top ten among them include: Decarbonising the world economy; Enhancing the energy efficiency and energy savings in buildings; Advancing the energy technologies; Moving towards energy systems based on variable renewables; Elect...
Article
There is an energy transition going on in Europe. In some parts of Europe we are witnessing things that were unimaginable few decades ago. As one of the cradles of industrial revolution, Scotland, mainly powered by coal, in March of this year permanently stopped using coal in electricity production after 115 years. The high cost resulting from comb...
Article
This paper presents the development of a rule-based energy management control strategy suitable for isolated diesel power-plants equipped with a battery energy storage system for peak load shaving. The proposed control strategy includes the generator scheduling strategy and peak load leveling scheme based on current microgrid active and reactive po...
Article
The paper deals with the heat integration of a bioprocess plant which produces yeast and ethyl-alcohol. The referent plant is considered to be a multiproduct batch plant which operates in a semi-continuous mode. The design of a heat recovery system is performed by batch pinch analysis and by the use of the Time slice model. The results obtained by...
Conference Paper
Geothermal energy is a widely available renewable energy source. In Croatia geological data has been indicating promising potential, especially in the North-Eastern part of the country with a geothermal gradient higher than 49°C/Km and terrestrial heat flux of 76mW/m2. Nonetheless, despite this potential, this resource is not highly exploited to da...
Article
The 6th Dubrovnik Conference on Sustainable Development of Energy, Water and Environment Systems (SDEWES Conference), attended by 418 scientists from 55 countries representing six continents. It was held in 2011 and dedicated to the improvement and dissemination of knowledge on methods, policies and technologies for increasing the sustainability of...
Article
In the Republic of Croatia there is some medium temperature geothermal fields (between 100 and 180 °C) by means of which it is possible to produce electricity. However, only recently concrete initiatives for the construction of geothermal power plants have been started. In previous papers, the possible cycles for geothermal fields in the Republic o...
Article
Purpose – Aging of the oil wells leads to a decrease in reservoir pressure and also to an increase in the water, gas and abrasive particles content. Therefore, there is a need for the oil pumps exploitation characteristics improvements. This paper aims to generate a valuable numerical model which will provide a useful tool to study various cases....
Article
Full-text available
Biomass cogeneration plants in wood industry are usually designed to cover large share of site heat demand. However, plant capability to cover peak load in winter could lead to low utilisation of installed capacities at sites whit high seasonal heat demand fluctuations. At some sites, where income of sold electricity is essential for plant investme...
Article
During the last decade, a design of an energy efficient and cost effective geothermal plant represents a significant and on-going technical challenge in all the Western Balkan countries. In the Republic of Croatia, the geothermal field Velika Ciglena is identified as one of the most valuable geothermal heat sources and probably the location where t...
Article
Improvements to the characteristics of a centrifugal pump through the addition of a vortex rotor were investigated both experimentally and with computational fluid dynamic (CFD) analysis. The idea behind that improvement is in creating so-called coherent structures of eddies and turbulence in the peripheral area of the vortex rotor mounted at the b...
Article
In the Republic of Croatia, there are several sources of medium-temperature geothermal water in the range of 90–140 °C, with which it is possible to produce electricity in binary plants, either with the Organic Rankine Cycle (ORC) or with the Kalina cycle. In the literature, the Kalina cycle is viewed as more thermodynamically favourable than the O...
Article
Full-text available
Today, the district heating (DH) is often based on cogeneration power plants with steam turbines for combined heat and power production (CHP turbines and plants). As the heat is supplied as steam with the given parameters, so CHP steam turbines are realized with controlled steam extractions. In case of stage-wise heating of the district heating sys...
Article
In the Republic of Croatia there are some medium temperature geothermal sources by means of which it is possible to produce electricity. However, only recently concrete initiatives for the construction of geothermal power plants have been started. Consequently, the paper provides proposals of the possible cycles for the Republic of Croatia. On the...
Article
Full-text available
Limitations of traditional first-law analysis, based upon thermodynamic performance of process unit coupled with mass and energy balances, are not a serious limitation when dealing with familiar systems. However, when dealing with more uncongenial, complex ones, it provides incomplete insight for such evaluation. These limitations came from the fac...
Conference Paper
The centrifugal impellers are used in a wide variety of turbo-machineries, ranging from low pressure fans for cooling of electric motor to high pressure ratio gas turbine compressors, from tiny cryo-cooler compressors to large industrial petrochemical compressor stations. The relative flow in centrifugal impeller is very complex due to different fl...
Article
This report presents a visual study of the transition process of the laminar boundary layer (BL) in a turbulent BL on a free rotating disc. The imaging is based on an experimental investigation that aimed to analyze the structure of the BL by relating it to the ratio between turbulent energy and vortex energy, the critical and the transient Reynold...
Conference Paper
In developing new designs of steam and gas turbines, and when defining their flow part, it is necessary to perform a large number of various calculations. Among others, these include also the calculation of heat transfer between working fluid and blades of stator and rotor caseades (e.g. due to determining the efficiency of energy conversion i.e. l...
Article
In solving the different problems of elaborating new designs of steam and gas turbine rotors, as well as in their operation, it is necessary to know the temperature fields of the rotors. The calculation accuracy of the temperature fields (including thermal stresses) depends on the validity of the applied thermal boundary conditions - the convective...
Article
This report presents the imaging of the transition process of the laminar boundary layer (BL) in a turbulent BL on a free rotating disc. The imaging is based on an experimental investigation 1 which aims to analyse the structure of the BL by relating to the ratio between turbulent energy and vortex energy, the critical and the transient Reynolds nu...
Article
Full-text available
In the paper "Modelling of Non-stationary Thermal Stresses in Steam Turbine Rotors" [1] presented on TMT 2004, the algorithm and the results of non-stationary thermal stresses modelling in steam turbine rotor by means of the users software package are shown. Non-stationary thermal stresses are stipulated by pressure change on turbine exit. The resu...
Article
Full-text available
In the paper "Modelling of Non-stationary Thermal Stresses in Steam Turbine Rotors" [1] presented at TMT 2004, the algorithm and the results of non-stationary thermal stresses modelling in steam turbine rotor by means of the users software package are shown. Non-stationary thermal stresses are stipulated by pressure change on turbine exit. The resu...
Article
The energy services delivered to urban areas in Switzerland make up more than 45% of the national energy consumption. Thus, in the framework of the Tetraener European project, a methodology has been developed to design low temperature thermal networks based on process integration techniques and GIS (geographical information system) database. Water...

Network

Cited By

Projects

Projects (8)
Project
Dear Colleagues, We are pleased to invite you to the 15th Conference on Sustainable Development of Energy, Water and Environment Systems – SDEWES Conference, to be held September 1-5, 2020 in TH Köln – Technology, Arts, Sciences, Cologne (Köln), Germany. SDEWES Conference is dedicated to the improvement and dissemination of knowledge on methods, policies and technologies for increasing the sustainability of development. Thus, SDEWES2020 will be an essential venue for researchers in those areas to meet, and originate, discuss, share, and disseminate new ideas. Please visit and explore our conference website at www.cologne2020.sdewes.org/ and do not hesitate to contact us via the official conference email: sdewes2019@sdewes.org. SDEWES2020 will bring you invited lectures from prominent experts in the field, panels and poster sessions as well as technical visits and a rich social programme. Presenting a paper on SDEWES2020 is also a great way to get your paper published in special issues of our partner journals. Register here for the Conference and don't miss out information and updates about SDEWES2020. Kind regards, Prof. Neven Duić, Conference Co-Chair, University of Zagreb SDEWES2019 Organizing Committee Date: 1 September 2019 - 5 September 2020
Project
Dear Colleagues, We are pleased to invite you to the 4th SEE Conference on Sustainable Development of Energy, Water and Environment Systems – SDEWES Conference, to be held June 28 – July 02, 2020 in the Hotel Europe, Sarajevo, Bosnia and Herzegovina. SDEWES Conference is dedicated to the improvement and dissemination of knowledge on methods, policies and technologies for increasing the sustainability of development. Thus, SDEWES2020 will be an essential venue for researchers in those areas to meet, and originate, discuss, share, and disseminate new ideas. Please visit and explore our conference website at www.sarajevo2020.sdewes.org/index and do not hesitate to contact us via the official conference email: sdewes.see2020@sdewes.org. SDEWES2020 will bring you invited lectures from prominent experts in the field, panels and poster sessions as well as technical visits and a rich social programme. Presenting a paper on SDEWES2020 is also a great way to get your paper published in special issues of our partner journals. Register here for the Conference and don't miss out information and updates about SDEWES2020. Kind regards, Prof. Neven Duić, Conference Co-Chair, University of Zagreb SDEWES2020 Organizing Committee Date: 28 June 2020 - 02 July 2020
Project
Dear Colleagues, We are pleased to invite you to the 1st AP Conference on Sustainable Development of Energy, Water and Environment Systems – SDEWES Conference, to be held April 06-09, 2020 in the Griffith University in South East Queensland, Australia. SDEWES Conference is dedicated to the improvement and dissemination of knowledge on methods, policies and technologies for increasing the sustainability of development. Thus, SDEWES2020 will be an essential venue for researchers in those areas to meet, and originate, discuss, share, and disseminate new ideas. Please visit and explore our conference website at https://www.goldcoast2020.sdewes.org/ and do not hesitate to contact us via the official conference email: sdewes.ap@sdewes.org. SDEWES2020 will bring you invited lectures from prominent experts in the field, panels and poster sessions as well as technical visits and a rich social programme. Presenting a paper on SDEWES2020 is also a great way to get your paper published in special issues of our partner journals. Register here for the Conference and don't miss out information and updates about 1st AP SDEWES2020. Kind regards, Prof. Neven Duić, Conference Co-Chair, University of Zagreb SDEWES2020 Organizing Committee Date: 6 April 2020 - 9 April 2020