Abstract:The aim of the paper is to present the results of a comprehensive analysis of three selected wood-based construction systems from design, technological and economical point of view. The selected construction systems imply the stick frame construction system, the structural insulated panels and the standard panel construction system. The optimal construction system from the perspective of a customer is evaluated on the basis of the multi-criteria optimization method. The typified design of the family house Largo 85 served as a model to present and analyze the parameters such as construction cost, construction time, heat transfer coefficient of external walls and air soundproof of walls. The mentioned criteria are the most significant for a customer when making a decision about the most suitable wood-based construction system.
Abstract:The aim of the research was to evaluate possibility to reduce the emission of the carbon monoxide (CO) in the biomass boiler, by application of a newly-designed secondary air supply system. The approach implied the practical tests of the real biomass boiler installation and numerical analyses of chosen optimizing solutions of the secondary air distribution system. Promising modifications have been implemented in the current design and tested. Results of the numerical and experimental studies have been compared and discussed.
Abstract:Construction industry has a large share in environmental pollution. In the context of building industry, it is also the transport of building materials and products, which largely contributes to environmental degradation. Construction increasingly promotes wood-based construction systems, thanks to faster construction, better environmental, energy and economic parameters. Prefabricated wood-based panel construction system fully utilizes construction, manufacturing and assembly advantages of the production to the efficiency of the entire construction process. The key moment to increase the efficiency and degree of prefabrication is panel’s finishing. Creation of structural elements in the factories allows a reduction in rides to the site. The paper analyzes the transport costs of the model house constructed by the system of traditional brick and panel system based on wood in the context of transport and manipulation of materials in both bearing systems.
Starowicz, Krzysztof, Milewski, Tomasz, Bosak, Grzegorz
Abstract:The cooling tower can be classified as a special structure, both in terms of reliability and size. The collapse of such a large tower, located closely to other buildings, may result in very serious consequences. It seems that special attention should be paid during design process of this kind of structures. Despite the increase in cost, the additional analysis and studies are indicated and also may raise reliability. The article presents the influence of wind action on the cooling tower. It consists of the studies on the issue of aerodynamic interference performed in the wind tunnel. The attention was particularly focused on the influence of the wind pressure on the shell of cooling tower, and on variability of these pressures on the surrounding objects. Making an adequate scale model, configuration of measuring equipment and an execution of wind tunnel tests will be described in this paper. The research was concentrated on measuring the pressure coefficients on the cooling tower surface in single situation and interference situations.
Abstract:The responsible waste management is an integral part of a sustainable construction process which is based on managing of waste stream on site, waste minimization, waste registry, waste disposal (reusing, recycling, landfilling, ...) on construction site, but also the policies and regulations in this field. Currently, many opportunities have arisen for the beneficial reduction and recovery of construction material that would otherwise be destined for the disposal as construction waste. The scope of use of these opportunities is related to the perception of waste management by construction companies, especially by contractors. The submitted paper presents the importance of on site waste management in terms of construction of buildings. The research was carried out through a questionnaire survey in Slovakia. It was focused on finding construction companies’ approach to the issues of waste management on building sites and problems in the field of construction waste registry. The first part of the paper is focused on attitudes to waste disposal depending on company size (using chi-squared test) and the second part is focused on attitudes to meeting waste legislation.
Abstract:This paper presents the results of studies conducted to determine the possibility of generating power using stove-fireplace with accumulation. During studies described in the paper, thermoelectric generator with the nominal power of 10 W and maximum operation temperature of 150°C was tested. Obtained results allowed to define real performance of the used generators. However, further tests are still needed to obtain better energy efficiency of the tested micro-scale cogeneration system.
Abstract:The article describes the results of performed calculations of heat transfer through the divisions of buildings designed in the technology of polystyrene prefabricates. All results were referred to the values contained in the new Technical Conditions. The article also contains the results of linear simulations of thermal bridges in the cited technology.
Abstract:This article presents the parameters of concentrated light, transmitted by optical fiber. A parabolic mirror was used for concentrating the solar radiation. An analysis of the spectrum of light reflected from the parabolic mirror and transmitted by using of variable length of the optical fibers is presented. The article also shows the simulations of the focused solar radiation with the transmitter in the form of fiber. This allowed to show the propagation of radiation inside the fiber and the distribution of the luminous flux on the important areas of the system. On the basis of this analysis, it is proved that the solar radiation concentrating system can be successfully used for lighting purposes.
Abstract:The paper presents a new approach to the design of the solar thermal system controller which is characterized by modular arrangement. The proposed solution enables the integration of controller functions that significantly improve user comfort and the overall reliability of the system. These functions may include both security operations (control of blinds for solar collector, emergency power supply) as well as system monitoring (heat meter, data logger with memory card, Internet-based monitoring, weather station).
Abstract:When analyzing large panel buildings, it is very rare to take into consideration the requirements connected with the overheating effect. The paper presents the results of the annual computational simulations of thermal comfort conducted for one flat of W70 multi-family large panel building. Basing on the simulations the authors analyzed the influence of night cooling on thermal comfort inside the flat. Different simulation steps were taken into consideration: windows with and without shading systems, opened during entire night or just during given periods of time to keep specific thermal conditions.