Phase change material based accumulation panels in combination with renewable energy sources and thermoelectric cooling

The article deals with the use of modern materials and technologies that can improve the thermal comfort in buildings. The article describes the design and usage of a special accumulation device, which is composed of thermal panels based on phase change materials (PCMs). The thermal panels have an integrated tube heat exchanger and heating foils. The technology can be used as a passive or active system for heating and cooling. It is designed as a "green technology", so it is able to use renewable energy sources, e.g., photovoltaic (PV) panels, solar thermal collectors and heat pumps. Moreover, an interesting possibility is the ability to use thermoelectric coolers. In the research, measurements of the different operating modes were made, and the results are presented in the text. The measurement approves that the technology improves the thermal capacity of the building, and it is possible to use it for active heating and cooling. © 2017 by the authors; licensee MDPI.CZ.1.05/2.1.00/03.0089, ERDF, European Regional Development Fund; MŠMT, Ministerstvo Školství, Mládeže a Tělovýchovy; IGA/CEBIA-Tech/2016/001, UTB, Univerzita Tomáše Bati ve ZlíněMinistry of Education, Youth and Sports of the Czech Republic [LO1303 (MSMT-7778/2014)]; European Regional Development Fund under the project CEBIA-Tech [CZ.1.05/2.1.00/03.0089]; Tomas Bata University in Zlin [IGA/CEBIA-Tech/2016/001

Comparison of lighting simulation outcomes for electric lights with real reference

In recent years, there has been considerable progress in the area of building lighting [1]. Especially in terms of efficiency, durability, and internal lights control possibilities offered by the system. Besides these affairs were conducted further studies focusing on the visual comfort in the indoor environment. The fact is that a considerable number of issues causing some visual discomfort can be solved by appropriately modifying the control logic of the system. For these reasons, a suitable way to control the lighting in this field is crucial. The design of control algorithms can be done in various ways, however, in recent years, very useful tools for performing complex lighting assessments are simulation tools [2]. This article deals with a comparison of the results of simulation tools and real measurements and further discusses the possibilities of using these tools to design lighting control algorithms. This article also describes a newly built lighting laboratory at Tomas Bata University in Zlin whose control system is based on the KNX bus and its components. The primary purpose of this laboratory was to study the interaction of natural and artificial lighting in the view of uniform illumination on the workplace and chromatic distribution through the room. However, as the lab control system is conceived, it is a prerequisite to using the laboratory to verify the various control algorithms based on both direct and feedback control. © 2018, World Scientific and Engineering Academy and Society. All rights reserved

Thermal energy storage in the form of heat or cold with using of the PCM-based accumulation panels

This article describes the usage of thermal energy storage in the form of heat and cold with an adaptation of the special device which is composed of the thermal panels. These panels are based on the phase change materials (PCM) for normal inner environment temperature in buildings. The energy for the thermal energy storage is possible to get from built-in electric heating foil or from the tube heat exchanger, which is build in the thermal panels. This technology is able to use renewable energy sources, for example, solar thermal collectors and air-to-water heat pump as a source of heat for heating of the hot water tank. In the cooling mode, there is able to use the heat pump or photovoltaics panels in combination with thermoelectric coolers for cooling.Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme [L01303, MSMT-7778/2014]; European Regional Development Fund [CZ.1.05/2.1.00/03.0089]; internal grant agency of Tomas Bata University in Zlin [IGA/CEBIATech/2016/001

Quadruple glazing panel filled with PCM and its influence on the sound insulation of building facades

The long-term pressure on a properly functioning modern infrastructure is the main reason for the development of new construction elements and technological processes. In the case of buildings, this development can offer original and significant improvements in aesthetic, functional and economical terms. Then the implemented structural elements and technological systems have a major impact on the overall of building quality, and comfort for occupants. Recently, when building structures are becoming lighter and lighter in weight, problems with heat accumulation and poor sound insulation occur. To improve the accumulation properties, production and implementation companies implementing accumulation materials into the buildings most frequently in the form of panels that can be incorporated into the peripheral walls or directly replace them. A subject of this paper is to study the effect of implementation one type of facade system into the perimeter walls on the airborne sound insulation of building facades. The research is dedicated to the quadruple glazing panel which is a translucent wall element without any mechanical components or electronic devices. © 2017, World Scientific and Engineering Academy and Society. All rights reserved.MSMT-7778/2014, MŠMT, Ministerstvo Školství, Mládeže a Tělovýchov

Mathematical model of non-stationary heat conduction in the wall: Asymmetric problem with the boundary conditions of imperfect heat transfer

This paper deals with the study of a non-stationary heat conduction in the solid wall. It is focused on mathematical modelling of its asymmetric heating and cooling by imperfect heat transfer to both sides of the wall. It describes method used for deriving of the long time analytical solution describing temperature distribution in the heated (cooled) wall by use Laplace transform and verification of its validity by numerical calculation with COMSOL Multiphysics software. In the tested example, the maximum difference between analytical and numerical solution was about 3.5 % considering the possible maximum and minimum temperatures in the wall under the given conditions.Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme [LO1303 (MSMT-7778/2014)

Regulation and temperature dependency of the light sources

The paper focuses on the regulation effect on the photometric properties of the artificial light sources generally used in administrative and residential buildings. If energy consumption is one of leading areas of usage, there is an area for improvement and energy savings. There are several approaches how to achieve this aim. This attempt for energy saving is limited by standards which regulate the quality of the luminous environment; for example, illuminance level, uniformity illuminance, the colour rendering respectively colour temperature or glare requirements.Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme [LO1303 (MSMT-7778/2014)]; Internal Grant Agency of Tomas Bata University in Zlin [IGA/CebiaTech/2016/001

Reverberation chamber and its verification for acoustic measurements

Reverberation rooms are useful for measurement of the acoustic quantities of machines that operate in long cycles, however, current reverberation chamber design practices often lead to known issues with reproducibility and repeatability of measured data. The problem is that construction process of these laboratories is performed according to the relevant standards requirements which are mainly focused on the volume of the room or on the absorption coefficient value of the boundary surfaces. Nevertheless, the inner-laboratory reproducibility of acoustic data is very difficult to achieve even when these diffusivity quantifiers are satisfied. This paper presents a verification process of an acoustic laboratory which proportions, shape and construction material of boundary surfaces are not in compliance with standards in every detail.Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme [LO1303 (MSMT-7778/2014)]; Internal Grant Agency of Tomas Bata University in Zlin [IGA/CebiaTech/2016/001]MOE, Ministry of Educatio

Conveyor Inverter - Design Lifting Mechanism

Tato bakalářská práce se zabývá návrhem koncepčního řešení dopravníkového střídače, který se používá pro změnu směru europalety o 90° mezi válečkovým a řetězovým dopravníkem podle zadaných technických parametrů. Práce obsahuje kompletní 3D návrh, konstrukční a funkční řešení, které je podloženo pevnostními a kontrolními výpočty. Zdvih střídače je prováděn za pomoci pákového mechanismu elektromotorem.I am concern with a proposal of conceptual solution of Conveyor Inverter in my bachelor work. This Conveyor Inverter is used for the change of the direction europallet about 90° between roller and chain conveyor according to given technical parameters. My bachelor work contains complete 3D proposal, constructional and functional solutions which are based on checking calculations. Lifting of the Conveyor Inverter is done using a leverage mechanism of electric motor.

Effect of cloudiness on the production of electricity by photovoltaic panels

The paper deals with the influence of different types of cloud on the production of electricity by photovoltaic panels. In the introductory part of the paper, processes in the atmosphere are described, giving rise to various types of clouds and, consequently, to the formation of cloud. In the next section of the paper, the system is described on which the research and the methodology of acquisition and data evaluation were carried out. The last part of the paper summarizes the overall results of the research.Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme [L01303, MSMT-7778/2014]; European Regional Development Fund [CZ.1.05/2.1.00/03.0089]; internal grant agency of Tomas Bata University in Zlin [IGA/CEBIA-Tech/2016/001

Computer simulation of temperature distribution during cooling of the thermally insulated room

This paper is devoted to modelling of temperature distribution and its time evolution in rooms with specific thermal insulation and heat transfer for different external conditions. The simulation results should help to design the room architecture and wall materials to reduce energy losses due to heating or cooling, and to increase the inside thermal comfort. For this purpose, a methodological procedure using real data processing in the COMSOL Multiphysics modelling environment and spatial visualization of temperature evolution is proposed. This paper describes a mathematical model for simulation of the temperature evolution inside a space with thermally insulated walls under selected outside conditions. Computer simulations are then used to assess the temperature distribution inside the room and the heat flow through the room walls. Results of the simulations are used for subsequent determination of the time needed for the desired decrease of air temperature inside the tested room during its cooling due to the low ambient temperature, which is related to the thermal stability of the building, specific heat capacity, and thickness of the thermal insulation. Under the studied conditions, the time to reach the temperature drops by 20 percent in a room with windows was from 1.4 to 1.8 times lower than that in the room without windows. The proposed methodology shows the flexibility of computer modelling in the design of insulated building systems. The mesh density testing was performed by comparing the air temperature evolution in the model of the selected mesh density and the model with its maximum value enabled by the size of computer memory. The maximum temperature deviation calculated for the mesh of the presented model was 0.57%. © 2018 by the authors.European Regional Development Fund under the project CEBIA-Tech Instrumentation [CZ.1.05/2.1.00/19.0376]; Ministry of Education, Youth and Sports of the Czech Republic within the National Sustainability Programme [LO1303 (MSMT-7778/2014)