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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Simulation Tool for Design of Multiple Photovoltaic Systems : Estimation of System Sizes, Grid Interaction, and Area Requirements

Björklund, Maria January 2021 (has links)
Photovoltaic solar power is an increasing source of energy and part of the renewable energy generation which is needed in the near future to achieve the set climate goals. When planning new photovoltaic installations, parameters which affect the design are both local conditions (e.g. weather) and system parameters such as tilt and azimuth angles. Commercial areas often have high loads during the day when solar power is available and are therefore interesting for photovoltaic installations. In order make a quick estimation of photovoltaic power potential in an area, a simulation tool which handles load profiles from multiple buildings would be desirable. The aim of this thesis project is therefore to create a tool which can simulate multiple photovoltaic systems and for each of them estimate system sizes, grid interactions, and area requirements. The simulation tool is based on Python programming with the aid of System Advisor Model, a simulation software for photovoltaic and other renewable energy tech-nologies. Optimization of orientation angles was made for clear sky with the goal of high load-generation match. Different system sizes were estimated and simulated based on different degrees of self-sufficiency, net-zero consumption, and the existing transfer capacity of the building in question. When the simulation result was compared to a detailed photovoltaic design project, some agreements between the results were found, as well as further development needs such as refining area estimation. To further develop the usability of the tool, a more user-friendly interface is needed. Other improvements could be to enable simulations of multiple direction systems and integration of the local grid structure and limitations.
2

Fuktproblem i tak till följd av solceller : Risker med skuggning av takkonstruktioner / Moisture related damages caused by Photovoltaic modules : Risks with shading of roof structures

Flygring, Pontus, Eliasson, Anton January 2023 (has links)
Energiomställning och globala mål ställer allt högre krav på länder, organisationer och olikabranscher, inte minst byggbranschen. En metod för att minska belastningen på det nationellaelnätet och göra fastigheter mindre beroende av de stora fluktuationerna i energipriserna ärsolcellsanläggningar. Privatpersoner och företag har sedan några år tillbaka satsat på att nyttjasolenergi som en kompletterande energikälla (Energimyndigheten 2019).En pressad marknad och snabba beslut leder till en stor ökning av solcellsanläggningar sommonteras på olika hustak. Vad blir följderna för husen som är försedda med heltäckandetakinstallationer, exempelvis solceller? Vilka potentiella konsekvenser kan dessa installationermedföra på lång sikt? (Svensksolenergi, 2023).Syftet med examensarbetet är att öka medvetenheten kring de risker som kan uppstå urfuktteknisk synvinkel vid installation av heltäckande takinstallationer som solceller. Alla hus ärunika och det finns flertalet typer av takkonstruktioner som alla har olika förutsättningar. Någraav de förutsättningar som ligger till grund för ett friskt hus är ventilation, tryckförhållanden,mängd samt omfattning av köldbryggor, klimat samt geografisk position och de förutsättningarsom finns på platsen. För att ett byggnadsmaterial inte ska överskrida gränserna för kritisktfukttillstånd efter installation av solceller bör konstruktionen kontrolleras innan montering viaen fuktteknisk utredning och/eller genom långa cykliska simuleringar med takets nyaförutsättningar. Det kan även behövas kontinuerliga mätningar efter installation för attsäkerställa en fukttekniskt säker konstruktion. Klimatet har en betydande inverkan påkonstruktionen och kan genomgå kraftiga variationer under ett år. I examensarbetet undersöksden inverkan som solceller har på uttorknings- och uppfuktningsprocesser i takkonstruktioner.I examensarbetet används det dynamiska fukt- och värmeberäkningsprogrammet WUFI Pro 6.7för att genomföra simuleringar av ett par konstruktioner med målet att undersöka hur ensolcellsanläggning påverkar fuktförhållandet i konstruktionen och om det kan uppstå risker medinstallationen.De simuleringar som genomförts visar att varma tak löper risk att utveckla fuktrelateradeproblem som mikrobiell tillväxt. Resultaten visade att parallelltak, som har goda fukttekniskaförutsättningar, är mer lämpade för solceller. En fuktteknisk bedömning bör utföras för varjeindividuellt fall för att säkerställa att konstruktionen klarar av skuggningen som solcellermedför. / Energy transition and global goals impose higher demands on countries, organizations, andvarious industries, including the construction industry. One of the now widely recognizedmethods to reduce the strain on the national power grid and decrease the dependency of theenergy price fluctuations is the installation of solar power systems. In recent years there hasbeen significant investment by private consumers and businesses in the adoption of solar energyas a supplementary power source (Energimyndigheten, 2019).A competitive market and rapid decision-making processes have resulted in a significantincrease in the installation of solar power systems on various rooftops. However, what happensto the houses covered with these types of full-coverage roof installations? And what are thepotential risks? (Svensksolenergi, 2023).The purpose of the degree project is to increase awareness of the moisture-related risks that canarise when installing full coverage roof installations such as PV-modules (Photovoltaicmodules). All houses are unique and there are several types of roof structures that all havedifferent properties. Some of the factors that form the basis of a healthy house are ventilation,pressure conditions, the number and extent of thermal bridges, climate, geographical positionand site-specific conditions. In order for a building material not to exceed the limits for criticalmoisture condition after installation of solar cells, the construction should be checked beforeinstallation via a moisture technical investigation and/or through long cyclic simulations withthe new conditions of the roof. There may also be a need for continuous measurements afterinstallation to ensure a moisture-safe structure. The climate has a significant impact on thestructure and can undergo strong variations during a year. The thesis examines the impact thatsolar cells have on dehydration and humidification processes in roof structures.In the thesis, the dynamic moisture and heat calculation program WUFI Pro 6.7 is used to carryout simulations of a couple of structures with the aim of investigating how a solar cellinstallation affects the moisture conditions in the structure and whether there may be risks withthe installation.The simulations conducted show that warm roofs are at risk of developing moisture-relatedproblems such as microbial growth. The results showed that parallel roofs, which has goodprerequisites for handling moisture, are more suitable for solar cells. A moisture assessmentshould be carried out for each individual case to ensure that the structure can cope with theshading caused by solar cells.
3

Návrh a optimalizace vybraných stavebně technologických procesů trvale udržitelné šetrné výstavby vegetačních střech / THE DESIGN AND OPTIMALIZATION OF SELECTED CONSTRUCTIONAL TECHNOLOGICAL PROCESSESS OF SUSTAINABLE ENVIRONMENT-FRIENDLY CONSTRUCTION OF THE VEGETATIVE ROOF

Selník, Petr Unknown Date (has links)
This presented dissertation is focused on the installation technology of green roofs and sustainable long-term stability considering the construction and runoff water management. The main topic of the study and research was the technical layer application, especially the newly developed retention board made of recycled polyester fiber and non woven textiles. Consistent monitoring was performed in the climatic conditions of the Czech Republic and selected installation technology.

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