National Repository of Grey Literature 104 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
EV vehicle cabin thermal management strategy in hot and cold climates
Matušková, Lucie ; Charvát, Pavel (referee) ; Fišer, Jan (advisor)
The goal of the work is to conduct an experiment to measure the temperature at which optimal thermal comfort is achieved. The experiment is carried out in a climate chamber, where constant climatic conditions acting on the vehicle can be ensured. The iHVAC measuring system is used to measure thermal comfort. Then to compare the values with the previous measurement that took place for other vehicles. Part of the work is devoted to research that describe the issue of thermal management of vehicles.
Recycling modern cars
Borik, Matúš ; Charvát, Pavel (referee) ; Štětina, Josef (advisor)
Zem čelí nadmernému prekračovaniu recyklačných limitov organických a anorganických surovín, čo spôsobuje nedostatočnú absorpciu skleníkových plynov. Automobilový priemysel sa v posledných desaťročiach rapídne rozbehol a má na tom svoj podiel. Významný negatívny vplyv na rast výroby automobilov má ťažba zdrojov, ktorá prináša niekoľko environmentálnych problémov, ako je vyčerpanie zdrojov, neudržateľnosť životného prostredia, ktorá vedie ku globálnemu otepľovaniu, a zdravotné problémy spojené s ťažbou zdrojov a výrobou automobilov. Ak sa má udržať úroveň používania automobilov, hlavným riešením je zamerať sa na recykláciu a výrobu ekologických vozidiel. Výskum recyklačných metód moderných vozidiel a ich analýza je zameraním tejto bakalárskej práce, ktorej konkrétnym cieľom poskytnúť náhľad rôznych typov recyklačných postupov. Prvá časť sa zaoberá všeobecnými princípmi recyklácie a recykláciou vozidiel po častiach. Následne práca presúva svoju pozornosť na obnoviteľné zdroje a ich využitie v automobilovom priemysle (elektromobily) a recykláciu moderných automobilov vyradených z prevádzky. Posledná časť prináša bližší pohľad na možnosti skladovania energie z obnoviteľných zdrojov, špecificky na vodíka (H2), jeho využitie v palivových článkoch, recykláciu vodíkových automobilov a budúcnosť pohonu. Práca konzultovaná s expert inžinierom danej oblasti.
Design of ventilation and cooling in a new-build terraced house
Petráš, Jan ; Charvát, Pavel (referee) ; Pech, Ondřej (advisor)
The master thesis deals with the design of a terraced new building, in particular forced ven-tilation and cooling with partial independence on electricity from external distributors. The thesis consists of two parts, theoretical and practical, which together contain 10 chapters on these topics. The thesis includes not only the design of ventilation and cooling, but also an energy-ethical simulation of the performance of both proposed systems, including the pro-duction of electricity. In the last chapter, attention is paid to the implementation and operat-ing costs of all the designed systems.
Design of ventilation and cooling in a two-family house
Exnerová, Anežka ; Charvát, Pavel (referee) ; Pech, Ondřej (advisor)
This diploma thesis deals with ventilation and cooling systems in two-generation family house. It is divided into two parts – theoretical and practical. Theoretical part describes basic terms and laws needed for subsequent solutions. The principle of ventilation and cooling, parts of air-handling units, air duct and distribution elements are presented. The thesis continues with calculations and device design. First, the selected object is described in aspects of construction and considered parameters. The amount of ventilation air is proposed, followed by the design of air handling units, piping and distribution components. Furthermore, there is the calculation of the thermal load of the attic apartment because there is a requirement for cooling. At the end of the thesis, implementation and operating costs are evaluated.
Comparison of solar thermal collectors and a heat pump powered by solar photovoltaics in terms of thermal energy production
Kuznetsova, Oksana ; Fišer, Jan (referee) ; Charvát, Pavel (advisor)
Lately there is a growing pressure on reducing energy demand of households. One way to limit energy production from fossil fuels is using sustainable energy sources. Aim of this paper is to compare 2 systems for production of hot water. It involves comparison of energy gains from solar collectors with gains from heat pump powered by photovoltaic pannels. These systems will be compared by using simulation programm TRNSYS. Parametric study will be done. Effect of each factor for these systems will be shown on simulation models
Design of ventilation system in residental spaces
Břenek, Václav ; Charvát, Pavel (referee) ; Pech, Ondřej (advisor)
This bachelor thesis deals with design of a ventilation system with recuperation in a chosen flat. The introductory chapter focuses on research of recuperation units and their parts. In the second chapter the required amount of ventilation air is determined, and three recuperation units are selected. In the third chapter the pipeline system is designed for the selected units, which is subjected to a control calculation of pressure losses. The last chapter compares the costs of implementation and operation of selected units.
Performance simulation of a solar PV system for a single-family home
Veličková, Kateřina ; Hejčík, Jiří (referee) ; Charvát, Pavel (advisor)
Recently, renewable energy resources have become an urgent issue, as a result there are many papers focused on photovoltaic power plants and their performance simulations. These simulations not only allow us to assess the reduction of dependency on the fossil fuels, but also to calculate costs saving. This work considers the operation of a single-family house in the Czech Republic. However, a summary of photovoltaic potential factors is presented as well as the most common applications used for performance simulations of photovoltaic power plants. In practical part of this work, the load profile for common household is determined based on the data provided by the Energy Market Operator, alternatively the load profiles of two households owning a plug-in hybrid are also determined. The performance simulation is assembled in TRNSYS application and the results are summed up in the last chapter.
Fast charging of EV vehicles - overview of technologies
Boršoš, Adam ; Charvát, Pavel (referee) ; Fišer, Jan (advisor)
Charging speed is one of the key parameters that affects the attractiveness of electric cars for drivers. Therefore, it is important to determine the methods that can charge the electric car as quickly as possible. An overview of electric vehicle charging technologies and the identification of those that are considered fast charging has been made. It has been found that the fastest technology is DC charging. A list of six connectors that allow this charging has also been created. These were then compared. An overview of charging networks, that enable fast charging, was made in the next chapter. The three largest providers of charging stations in the Czech Republic and also the two that specialize in fast charging were listed. The topic of battery cooling is also related to charging. Therefore, the following chapter provides an overview of technologies that are used to cool batteries. The last part focuses on the factors that cause the degradation of batteries. An overview of the four main causes of degradation and their effect on the battery was demonstrated.
Energy retrofitting of a family home to the nearly zero energy building
Uhlíř, David ; Fišer, Jan (referee) ; Charvát, Pavel (advisor)
The diploma thesis is devoted to reducing the energy intensity of a two-storey family house from the 1960s, to a building with almost zero energy consumption. First, the family house is analyzed in terms of the condition before reconstruction. The result of this analysis is a certificate of energy performance of the building in its original condition. Within the individual chapters, I subsequently propose specific energy saving measures. At the end of each chapter, these measures are economically evaluated using the New Green Savings Grant Program. The first measure is dedicated to improving the thermal technical properties of the building envelope. This is ensured by the complex insulation of the family house and the replacement of the original windows and doors. The second measure is devoted to the design of a suitable method of forced ventilation with heat recovery. As part of the third measure, I assess and select a suitable heat source that will replace the original heat source of the family house. As a final measure, I propose the use of a renewable energy source in the form of a photovoltaic system, which is based on energy simulation in the program DEKSOFT FVE. At the end of my work, I am developing a building energy performance certificate, which assesses the fulfillment of the condition of a building with almost zero energy consumption.
Computer modelling of phase change hysteresis
Petrášová, Anna ; Charvát, Pavel (referee) ; Klimeš, Lubomír (advisor)
This thesis deals with computer modeling of temperature hysteresis during phase change, namely complete and partial phase change. There is performed a review of methods for modeling temperature hysteresis based on the enthalpy method and the effective heat capacity method. In the case of complete phase change, there are several methods that use the effective heat capacity method, as well as the heat source method, which, on the contrary, is a certain analogy of the enthalpy method. The following are works dealing with modelling of partial phase change, the most interesting of which is due to the validation method of static hysteresis and the method designed by Bony and Citherlet. The second part of this thesis deals with the hysteresis behavior of the material with phase change, which is organic paraffin RT 27. The input data obtained by differential scanning calorimetry was converted to the dependence of the enthalpy on temperature. These curves was represented by piecewise linear function. In the case of partial phase transformations, a modeling method based on the methods proposed by Bonym and Citherlet was designed. An one-dimensional model enabling thermal simulation of the material was implemented in the MATLAB software environment. The results obtained with this simulation are finally compared with a model that does not consider thermal hysteresis.

National Repository of Grey Literature : 104 records found   1 - 10nextend  jump to record:
See also: similar author names
1 Charvát, Patrik
17 Charvát, Petr
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