Saso Medved

Saso Medved
University of Ljubljana · Faculty of Mechanical Engineering

Professor

About

113
Publications
16,029
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
1,549
Citations
Additional affiliations
January 1983 - December 2015
University of Ljubljana
Position
  • Researcher

Publications

Publications (113)
Article
Full-text available
Free cooling of PV cells is a common research topic; it lowers the operating temperature of PV cells, resulting in higher electricity production. This article investigated free cooling techniques for the wide range of thermal properties of the PCM layer installed on the backside of the PV cell. Two options were assumed: micro-encapsulated PCM in wh...
Article
Full-text available
The cooling of PV has been shown to increase electricity production. Among passive techniques, evaporative cooling has one of the greatest potentials. In this work, the efficiency and sustainability of this technique have been investigated for various climatic conditions. In-situ experiments were conducted to develop parametric models for PV cell t...
Chapter
In this chapter, the development of a computer tool for the determination of nearly zero energy buildings (nZEB) metrics upgraded with life cycle assessment (LCA) and life cycle cost (LCC) indicators is presented, following the requirements of the Energy Performance of Buildings Directive (EPBD). The computer tool was developed for the assessment o...
Chapter
More than 80% of the population in developed countries live in urban areas. Urban-area developments in the past century have led to major changes in land use and, what is even more problematic, it also affects the physical, chemical and biological processes occurring in the nature. One of the most obvious consequences of urbanization is the appeara...
Chapter
Building structures are in constant contact with water in at least one of its states of matter. Water or water vapour enter and exit building structures as a consequence of precipitation, hydrostatic pressure, capillary suction and the water-vapour pressure difference between the indoor and outdoor air. The analysis of water and water-vapour transp...
Chapter
Emitting and perceiving sound are the most important ways that people use to exchange information. Sound is a phenomenon related to mechanical waves and oscillations that propagate through compressible/elastic matter, such as air or building materials, in the form of sound waves. However, human hearing also senses disturbing sounds, referred to as...
Chapter
Besides providing indoor living comfort, a building must also ensure the safety of its occupants. Natural disasters excluded, the safety of a building’s occupants is most often threatened by fire. More than one-third of all fires in the world are related to fires in buildings, and currently more than 10 people per million of the population die in b...
Chapter
Nowadays we spend most of our time in buildings. The building designers are therefore responsible for creating a pleasant, productive and healthy indoor environment. Adequate thermal comfort plays a very important role in achieving this goal. Thermal comfort is also close related to the energy use. In the European Union, buildings are responsible f...
Chapter
Vision is the sense that provides us with the majority of information about the natural and built environments. The information received depends on the characteristics of the light source, the optical properties of the objects reflecting the incoming light, and the way we perceive light with our ability to see. Besides that, light is involved in th...
Chapter
There are many sources of air pollutants in buildings, such as people, appliance and built materials, which cause the air in buildings to be more pollutant than in the outdoor environment. The increased content of pollutants in the indoor air can affect the well-being, work performance and even the health of the occupants. Such conditions can be av...
Book
The book presents the theoretical background of building physics, dealing with the evaluation of physical phenomena related to heat transfer and energy use in buildings, water and water vapour transfer in building structures, daylighting and electric lighting of buildings, sound transmission in building structures and protection against noise, the...
Article
Full-text available
Recently, intensive technological development in the field of energy efficiency of buildings has occurred, which should enable the transition from nearly Zero (nZEB), through net Zero (NZEB) to ultimate Zero Energy Buildings (ZEB). The last stage will also require a transition from the grid to onsite storage of each energy carrier needed for the op...
Conference Paper
Full-text available
This paper focuses on indoor air quality in single-sided intermittent natural ventilation of classrooms in primary schools which is the most common technique of ventilation in the majority of older schools in Slovenia, despite intensive energy renovation in last decades. Study focuses on thermal response and air exchange rates established in single...
Chapter
The object of the research described in this chapter is evaluation of the thermal response of advanced glass façade structures with improved energy performance during cooling of the building. Two types of glazed façade structures were analyzed: a six-pane glazing structure upgraded with a building integrated photovoltaic (BIPV) system with and with...
Conference Paper
Full-text available
This study evaluates the cooling effect of latent heat storage (PCM) on integrated PV cells between two glass layers in a double-glazed ventilated building-integrated photovoltaic (BIPV) façade. Transient CFD simulations were performed to investigate the potential of thermal management. The varying parameters were: PCM thickness, PCM thermal conduc...
Article
Full-text available
High energy efficiency, energy autonomy, and improved living conditions are basic requirements of sustainable buildings. Advanced building envelope structures can provide these requirements. In the present paper, multipurpose façade structure designed as semi-transparent modular building-integrated photovoltaic façade with a forced ventilated cavit...
Article
Full-text available
Building integrated photovoltaics (BIPV) is technology that can significantly increase the share of renewable energy in final energy supply and are one of essential technologies for the nearly zero-energy buildings (nZEB), new build and refurbished. In the article (a) an experimental semitransparent BIPV glazed façade structure with 60% of PV cell...
Chapter
Residential sector is the largest energy demand sector in EU with almost 40% share in final energy use. Due to predicted climate changes and increasingly intense of urban heat islands, it is expected that not only energy demand for cooling of the buildings will increased. Even more important is that conditions of indoor comfort will deteriorate at...
Article
Full-text available
Due to energy, environmental, and social benefits, green roofs are recognized as a bioclimatic technology and sustainable construction systems and are becoming a predominant solution in connection with urban planning and building envelope retrofitting. To support design and marketing of Urbanscape® lightweight extensive green roofs a special softwa...
Article
Full-text available
In the paper methods and the development of computer tool for the comprehensive life cycle assessment evaluation of the new or renovated buildings is presented. To support decision making process, computer tool was developed and consists of two computational units: the building description unit (BDU), and the life cycle assessment tool (Etool). BDU...
Article
Full-text available
The paper presents a study on the thermal and hydrological response of lightweight extensive green roofs with lightweight mineral wool growing media in different European climate conditions. The green roof heat and mass transfer model was developed and experimentally validated. It was then integrated into a developed software tool for the whole yea...
Article
Full-text available
The planning process of nearly Zero Energy Buildings (nZEB), as defined in Energy Performance of Buildings Directive (EPBD), requires that designers check their solutions at all stages of planning. In the initial design phase, methods and tools for which only basic design knowledge of the modelling of energy efficiency indicators is required are of...
Article
Full-text available
This paper presents research on the nearly Zero Energy Buildings (nZEB) metrics of an all-glass office building with advanced multi-layer six-pane glass and building integrated photovoltaic (BIPV) façade structures in different climate conditions. The study was carried out in the following steps: i) development of a time series model of dynamic the...
Article
Full-text available
This paper presents seasonal‐energy storage of solar energy for the heating of buildings. We distinguish several types of seasonal storage, such as latent, sensible, and chemical storage, among which the thermochemical storage is used and analysed in this research. In the first part, a laboratory heat‐storage tank, which was made in the laboratory...
Article
Full-text available
Despite the great progress made in the energy performance of buildings in recent decades, buildings remain significant energy consumers. Many advanced technologies for increase of energy efficiency have been developed, and strong commitments to increasing the energy performance of buildings have been adopted. The most well-known is the Recast of En...
Chapter
Actions and goals towards sustainable societies should address the design, construction and use of buildings. The building sector has significant impact on the use of natural resources and the quality of the environment. Recent studies shown that half of natural resources used are related to the building sector. At the same time, the construction a...
Chapter
In addition to the large scale power plants presented in Chap. 2, there are several technologies for dispersed or in situ generation of electricity. In general these technologies use local renewable energy sources in the form of solar and wind energy or biomass. Small scale hydropower plants are a highly efficient technology with high durability an...
Chapter
Ventilation is the process of the dilution of indoor air pollutants by exchanging the indoor air with the exterior air. This can be done because, in general, outdoor air is less polluted that indoor air. With ventilation, the amount of indoor air pollutants must be lowered to a level that does not affect the perceived quality of the indoor environm...
Chapter
In this chapter, methods for the experimental determination of thermal properties of building envelopes are presented. These methods are used for commissioning, the process performed by independent experts prior to handling over the building to the customer, in the process of energy labelling of the buildings or to evaluate the most cost effective...
Chapter
Buildings in northern and continental European climates need to be heated more than the half of the year to maintain required indoor thermal comfort; even in the Mediterranean countries space heating is needed at least occasionally. The energy used for the space heating of residential buildings has the largest share in energy demand for operation o...
Chapter
The development of societies depends now more than ever on reliable energy supplies. We are in the century in which there will be a transition from the dominance of non-renewable fossil flues to low carbon societies that will be based on the use of renewable energy sources. Nevertheless, it is expected that non-renewable sources will remain signifi...
Chapter
Domestic hot water (DHW) is needed for personal hygiene and washing. In low-energy and passive buildings, energy consumption for DHW water heating can exceed the amount of energy used for heating the building. DHW systems are included in the energy use assessment of the buildings as one of the so-called EPBD (Energy Performance of Building Directiv...
Chapter
Building physics study the processes that occurs in the building structures that influence the indoor comfort and safety of inhabitants. A group of building physics professors at European universities, founded by Professor Karl Gertis, defined the following fields of interest: heat transfer in buildings, water and water vapour transfer in building...
Chapter
Human beings gather more than 80% of their information about their surroundings by visual perception. The information that we receive is influenced by the characteristics of the light source, the optical properties of objects reflecting the incoming light into the surrounding space, and the way we perceive light by sight and visualise “what we see”...
Chapter
According to official EU data, about 35% of buildings in EU are more than 50 years old and, as a consequence, extremely poorly energy efficient. It is assumed that if the overall energy efficiency of the buildings in EU were to be improved, the final energy consumption could be decreased by as much as 6%, resulting in a 6% decrease of CO2 emissions...
Chapter
In this chapter, the design and assessment of indoor living comfort conditions are presented from an engineering perspective. This means that perceived physical process that occur in the indoor environment and influence the response of the residents’ bodies and ability to perform work are transferred into several groups of physical indicators and r...
Chapter
In this chapter, the link between environmental protection and energy policy on future energy supply and demand is shown. The contents of the Energy Performance of Building Directive (EPBD) as direct results of global warming mitigation policy is presented. Energy performance indicators of nearly Zero Energy Buildings are presented, as they are def...
Chapter
The International Energy Agency (IEA) predicts that the final energy demand for cooling worldwide will increase from current 4 to 9 EJ per year by the year 2050. There are several reasons for increased energy demand. The contemporary architecture trend of “all-glass” architecture is a significant reason for the increased energy need for cooling of...
Chapter
In the European Union, heat is dominant form of energy needed in buildings. More than 50% of total final energy demand in EU is in form of heat and more that 80% of heat is needed at temperatures less than 250 °C. In buildings, heat is needed for space heating, domestic hot water heating, and air-conditioning and for space cooling when cold is prod...
Book
This book presents cutting-edge work on the energy efficiency and environmental sustainability of buildings, examining EU policies, regulations and technologies for complex systems such as passive buildings, sustainable buildings and, as part of the Energy Performance of Building Directive (EPBD), nearly Zero Energy Buildings (nZEB) requirements. I...
Conference Paper
Full-text available
Bionic façade presented in the paper is a technological system which mimics functions of vertical greenery systems and, comparatively, enhances cooling potential and reduces of building’s footprint. In the paper, a numerical investigation of the cooling potential of the bionic façade in three different climates in summer conditions is performed. Th...
Article
Full-text available
Green façades or vertical greenery systems (VGSs) are continuously gaining attention among urbanists for improving the living comfort and energy efficiency in urban areas. However, modeling and simulating the thermal response of VGSs remains a research topic. This paper introduces a novel inverse modeling approach for modeling the thermal response...
Article
Full-text available
This paper presents a study of the thermal response of lightweight extensive green roofs with lightweight mineral wool growing media in wintertime in water-freezing conditions. A model of green roof heat and mass transfer was developed, which considers sensible as well as latent heat accumulation in plants and lightweight mineral wool growing media...
Article
Full-text available
For the construction of modern energy-efficient buildings, lightweight construction is becoming very popular among designers. EU legislation encourages such design, especially if wood, as a sustainable material, is used. However, lightweight building envelope construction, in general, exhibits poor dynamic thermal properties, which are particularly...
Article
Objective: Objective: The aim of this study is to analyse the symptomatic response of elderly people to heat burden and indoor air quality exposure, and to create an index, the basis on which healthcare workers could react and prevent heat-related illnesses when the first symptoms appear. Methods: The impact of the indoor thermal environment was...
Article
Objective: The aim of this study is to analyse the symptomatic response of elderly people to heat burden and indoor air quality exposure, and to create an index, the basis on which healthcare workers could react and prevent heat-related illnesses when the first symptoms appear. Methods: The impact of the indoor thermal environment was studied with...
Conference Paper
Full-text available
Well-designed experimental facilities allow research studies with high confidence in results and allow studies at different influential boundary conditions. This paper presents highly sophisticated experimental apparatus for experimental studies of natural and mixed convection which is installed in Lindab IMP Klima, Godovič, Slovenia. Presented are...
Article
Full-text available
Vertical greenery systems (VGSs) are becoming a common architectural element in urban environments. In addition to the aesthetics of VGSs, impacts on building's energy demand and heat island mitigation in cities has been identified. In the present study, experimental results of thermal response and properties of VGSs with vertical leaf area index (...
Conference Paper
Full-text available
Building sector uses about 40 % of all primary energy in European Union. This sector consequentially presents a great potential of improving energy efficiency, enhanced usage of renewable energy sources and reducing emission of CO2. Beside other approaches for achieving these goals implementation o1 low-exergy systems for surface heating and coolin...
Article
Full-text available
Free cooling by enhanced night-time ventilation could be an efficient technique for decreasing the energy demand for the cooling of buildings. Such systems use the ambient cold of surrounding air, which is transported into buildings by mechanical fan-driven ventilation systems. Only carefully designed and operated systems can be efficient enough to...
Article
Full-text available
In energy-efficient, lightweight buildings, a high solar heating fraction can only be achieved if the solar system contains adequate heat storage. In this paper, the design and thermal response modelling of a solar air heating system, which consists of an air vacuum tube solar collector and latent heat storage, is presented. For the system performa...
Conference Paper
Full-text available
Building sector in EU shows a significant potential for improving energy efficiency, reducing CO 2 emissions and for expanded use of renewable energy sources. For achieving those goals different concepts and systems can be integrated in the buildings for heating and the cooling. One of available approaches is low-exergy heating and cooling by using...
Article
Full-text available
This paper presents thermal response study of lightweight extensive green roofs with lightweight mineral wool growing media in winter period. Green roof heat and mass transfer model was developed based on short- and long-wave radiation heat exchange, surface convection and vegetation evapotranspiration. The model also considers latent heat accumula...
Article
This paper presents experimental study of supported mixed convection of two-dimensional wall jet over various thermal activation lengths of vertical TABS. It was found out that supported mixed convection upward the jet over vertical TABS is not influenced by thermally inactivated vertical TABS downwards of the wall jet. Practical consequences of th...
Conference Paper
Full-text available
Vertical greenery systems (VGS) are proven to decrease energy consumption for cooling of the building due to the evapotranspiration and shading of the building envelope. Despite innovative architectural solutions, there are some drawbacks of VGS that are most commonly related to the maintenance. Alternatively, bionic façade inspired by VGS can be d...
Article
Full-text available
This paper presents the design and modelling of the heat transfer of a solar air heating system, which consists of a vacuum tube air solar collector (SC) and latent heat thermal energy storage (LHTES), and a parametric analysis of the performance of this system. LHTES is a form of short-term daily storage that stores the SC heat during the day and...
Chapter
You can get your copy of book: Sugar Beets: Production, Uses and Health Implications on Nova Science Publishers web page: https://www.novapublishers.com/catalog/product_info.php?products_id=52424&osCsid=5e9a553a1b1129fed10cc0ad3598a587
Conference Paper
Full-text available
Vertical greenery systems (VGS) are proven to decrease energy consumption for cooling of the building due to the evapotranspiration and shading of the building envelope. Despite innovative architectural solutions, there are some drawbacks of VGS that are most commonly related to the maintenance. Alternatively, bionic façade inspired by VGS can be d...
Chapter
Energy sources of mankind are changing due to intense research, technology and serious global consequences. The present energetic paradigm of our society, based on the massive use of fossil fuels, has to be changed rapidly, due to the serious influence on the environment. Since mobility is essential to our modern industrialized society, the known o...
Article
Full-text available
Green façades are becoming an important architectural element in an urban environment. Regarding the technology of the installation of green façades, one can distinguish between direct and indirect green façades, living walls and double skin façades with foliage. In addition to aesthetics of green façades, an impact on the outdoor and the indoor co...
Article
Full-text available
Predicted climate changes and the increased intensity of urban heat islands, as well as population aging, will increase the energy demand for the cooling of buildings in the future. However, the energy demand for cooling can be efficiently reduced by low-exergy free-cooling systems, which use natural processes, like evaporative cooling or the envir...
Conference Paper
Green façades are becoming an important architectural element in an urban environment. Regarding the technology of the installation of green façades, one can distinguish between direct and indirect green façades, living walls and double skin façades with foliage. In addition to aesthetics of green façades, an impact on the outdoor and the indoor co...
Article
Full-text available
Energy demands for cooling of the buildings will increase in the future due to expected climate changes and increased intensity of the urban islands. Thermo-active building systems show a high potential for reducing energy needs for cooling of the buildings. This article presents an experimental study of natural and mixed convection over thermally...
Article
The fact that the environment and human beings interact with each other has been known for centuries. In the present study, elderly’s heart rate (HR) and blood pressure response to indoor thermal comfort and indoor air quality (IAQ) were investigated. Indoor thermal comfort was characterized by Humidex, IAQ by CO2 concentrations. The results show t...
Article
This paper presents a study of mitigation of the heat island effect in the built environment with urban (city) parks. The park cooling island (PCI) effect, considering park grass cover and trees’ density and age, is determined for selected extreme summer days at various wind speeds under the optimum soil water conditions in the root zone based on a...
Conference Paper
Full-text available
Green façades are proven to have a significant impact on temperature and air flow conditions at the building boundary especially during the summer. A microclimatic layer caused by a green façade decreases the energy consumption for the cooling and improves indoor climate because of lower building envelope and ventilation air temperatures. Despite i...
Conference Paper
Full-text available
Primary energy usage for buildings cooling needs to be reduced in coming years. This goal can be achieved with combination of different approaches; one of possibilities with high potential is low exergy cooling based on high temperature environmental sources combined with thermally activated room surfaces. Vertical walls present major part of room...
Article
This paper presents a study of the thermal characteristics of a concentric-tube heat exchanger that is a key element in local ventilation device. The inner tube of the concentric-tube heat exchanger has a sinusoidal, wavy surface in the longitudinal direction, which enables heat-transfer enhancement. The tube can be stretched to a certain extent an...
Article
Full-text available
microclimatic layer of the green façade is proven to have specific temperature and flow conditions on the building envelope. Lower temperatures and wind velocities, and higher relative humidity in the microclimatic layer are the characteristics of vertical greenery systems, which cause lower energy consumption for the cooling and heating of buildin...