Global ETD Search

51	Basic Comparison of Three Aircraft Concepts: Classic Jet Propulsion, Turbo-Electric Propulsion and Turbo-Hydraulic Propulsion Rodrigo, Clinton January 2019 (has links) (PDF) Purpose - This thesis presents a comparison of aircraft design concepts to identify the superior propulsion system model among turbo-hydraulic, turbo-electric and classic jet propulsion with respect to Direct Operating Costs (DOC), environmental impact and fuel burn. --- Approach - A simple aircraft model was designed based on the Top-Level Aircraft Requirements of the Airbus A320 passenger aircraft, and novel engine concepts were integrated to establish new models. Numerous types of propulsion system configurations were created by varying the type of gas turbine engine and number of propulsors. --- Findings - After an elaborate comparison of the aforementioned concepts, the all turbo-hydraulic propulsion system is found to be superior to the all turbo-electric propulsion system. A new propulsion system concept was developed by combining the thrust of a turbofan engine and utilizing the power produced by the turbo-hydraulic propulsion system that is delivered via propellers. The new partial turbo-hydraulic propulsion concept in which 20% of the total cruise power is coming from the (hydraulic driven) propellers is even more efficient than an all turbo-hydraulic concept in terms of DOC, environmental impact and fuel burn. --- Research Limitations - The aircraft were modelled with a spreadsheet based on handbook methods and relevant statistics. The investigation was done only for one type of reference aircraft and one route. A detailed analysis with a greater number of reference aircraft and types of routes could lead to other results. --- Practical Implications - With the provided spreadsheet, the DOC and environmental impact can be approximated for any commercial reference aircraft combined with the aforementioned propulsion system concepts. --- Social Implications - Based on the results of this thesis, the public will be able to discuss the demerits of otherwise highly lauded electric propulsion concepts. --- Value - To evaluate the viability of the hydraulic propulsion systems for passenger aircraft using simple mass models and aircraft design concept. ddc:620 info:eu-repo/classification/ddc/629.13 Luftfahrt Luftfahrzeug Flugmechanik Betriebskosten Aeronautics Airplanes Airplanes--Performance Cost accounting Ölhydraulik Flugtriebwerk Elektroantrieb Kraftstoffverbrauch Flugzeug Entwurf Dimensionierung Aeroplanes Design Airplanes--Jet propulsion Airplanes--Turbofan engines Electric propulsion Hydraulics Airplanes--Fuel consumption Environmental protection Airbus A320 aircraft aircraft design flight mechanics engines hybrid propulsion hydraulics certification DOC Direct Operating Costs Airbus A320
52	Ocenění stavby v realizační a provozní fázi životního cyklu / The valuation of construction in implementing and operating phases of the life cycle Hudeček, Gabriel January 2012 (has links) This thesis treats about evaluation of construction in the operating phase and in the implementing phase of the life cycle, too. The thesis is e.g. about theoretical and practical budgeting of building object, real estate evaluation and implementing costs of concrete object. The main aim of this thesis is compilation of price concrete object with the help of budget and valuation by methods for real estate evaluation. In this thesis is done the valuation of object in the actual price level and in the price level of 1976. The price and the material development is illustrated between these ages, too. The real operating costs of object and their development and comparing with average wages are illustrated since 1980 until today.
53	Návrh vytápění a ohřevu teplé vody v rodinném domě / Design of a space and DHW heating system for a detached dwelling Záboj, Jakub January 2011 (has links) The thesis aims to propose a system for heating and hot water for a family house, according to drawings supplied by the building architect. At the request of the investor as the primary object will be considered a variant of underfloor heating. For comparing the heat loss, economic and possibly to State subsidies system selected will be processed by an alternative option to the ventilation air heating. Underfloor heating and hot air are among the low-temperature heating system, which can use low temperature heat sources, such as heat pumps. This assumption corresponds to investor requests, the source of heat in a family house with a heat pump and gas boiler. For hot water will be used as an alternative to a fireplace in the living room. To use the results of the thesis is to calculate the heat loss and heat, according to current standards include design and hot-water heating system including hot-drawing documentation. Finally, the economic evaluation of different alternatives in terms of investment and operating costs.
54	Evaluation of the Hybrid-Electric Aircraft Project Airbus E-Fan X Benegas Jayme, Diego January 2019 (has links) (PDF) Purpose - This master thesis evaluates the hybrid-electric aircraft project E-Fan X with respect to its economical and environmental performance in comparison to its reference aircraft, the BAe 146-100. The E-Fan X is replacing one of the four jet engines of the reference aircraft by an electric motor and a fan. A turboshaft engine in the cargo compartment drives a generator to power the electric motor. --- Methodology - The evaluation of this project is based on standard aircraft design equations. Economics are based on Direct Operating Costs (DOC), which are calculated with the method of the Association of European Airlines (AEA) from 1989, inflated to 2019 values. Environmental impact is assessed based on local air quality (NOx, Ozone and Particulate Matter), climate impact (CO2, NOx, Aircraft-Induced Cloudiness known as AIC) and noise pollution estimated with fundamental acoustic equations. --- Findings - The battery on board the E-Fan X it is not necessary. In order to improve the proposed design, the battery was eliminated. Nevertheless, due to additional parts required in the new configuration, the aircraft is 902 kg heavier. The turboshaft engine saves only 59 kg of fuel. The additional mass has to be compensated by a payload reduced by 9 passengers. The DOC per seat-mile are up by more than 10% and equivalent CO2 per seat-mile are more than 16% up in the new aircraft. --- Research limitations - Results are limited in accuracy by the underlying standard aircraft design calculations. The results are also limited in accuracy by the lack of knowledge of some data of the project. --- Practical implications - The report contributes arguments to the discussion about electric flight. --- Social implications - Results show that unconditional praise given to the environmental characteristics of this industry project are not justified. ddc:620 info:eu-repo/classification/ddc/629.13 Luftfahrt Luftfahrzeug Elektroantrieb Flugmechanik Aeronautics Airplanes Electric propulsion Airplanes--Performance Betriebskosten Kraftstoffverbrauch Luftverschmutzung Fluglärm Projektbewertung Technikbewertung Luftfahrttechnik Flugtriebwerk Passagier Flugzeug Entwurf Dimensionierung Cost accounting Airplanes--Fuel consumption Environmental protection Airplanes--Noise Evaluation Technology assessment Aerospace engineering Airplanes--Jet propulsion Airplanes--Turbofan engines Design aircraft aircraft design flight mechanics engines certification DOC Direct Operating Costs Airbus E-Fan X BAe 146
55	Vliv provedení zateplení panelového domu v Ostravě na výdaje spojené s jeho provozem / The Influence of Thermal Insulation of a Concrete Panel Block of Flats in Ostrava on the Expenses Related to its Operation Pospíšil, Tomáš January 2019 (has links) Residential building, thermal insulation, thermal insulation system energy saving, economic return on investment
56	Modelování vývoje hodnoty středního stavebního závodu v reálné konkurenci ČR / The Modelling of The Development of The Middle-Size Building Enterprise Value in The Real Competition of The Czech Republic Křížovská, Eliška January 2020 (has links) The dissertation thesis is elaborated to the theme “The Modelling of The Development of The Middle-Size Building Enterprise Value in The Real Competition of The Czech Republic“. In the introduction of the dissertation thesis, a relation of the chosen theme to the branch of Forensic Engineering is defined and a survey about a contemporary state of the solved problems is elaborated. Further on, the objectives of the dissertation thesis are stated there namely including a formulation of a problem. The dissertation thesis contains the basic data about the examined middle-size building enterprise of a regional significance and its competitive building enterprises. At all enterprises, a property evaluation by an assessment of a substantial value and a returns’ evaluation by a method DCF Entity are carried out. The component of the dissertation thesis is a proposal of a simple expert standard containing methodical recommendations at an assessment of a value of a building enterprise of a regional significance. This is the essential contribution of the dissertation thesis for the branch Forensic Engineering whose starting ascertainments are practical pieces of knowledge and experience with the behaviours of the middle-size building enterprises in a period of a financial crisis.

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