uu.seUppsala universitets publikasjoner
Endre søk
Begrens søket
1234 151 - 154 of 154
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Treff pr side
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sortering
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
  • Standard (Relevans)
  • Forfatter A-Ø
  • Forfatter Ø-A
  • Tittel A-Ø
  • Tittel Ø-A
  • Type publikasjon A-Ø
  • Type publikasjon Ø-A
  • Eldste først
  • Nyeste først
  • Skapad (Eldste først)
  • Skapad (Nyeste først)
  • Senast uppdaterad (Eldste først)
  • Senast uppdaterad (Nyeste først)
  • Disputationsdatum (tidligste først)
  • Disputationsdatum (siste først)
Merk
Maxantalet träffar du kan exportera från sökgränssnittet är 250. Vid större uttag använd dig av utsökningar.
  • 151.
    Wallin, Erik
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper.
    Utredning av solenergi för drivning av sorptiv kylprocess för inomhusluften på Stockholmsarenan2011Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [en]

    Cooling down the indoor air can be done in several ways. One way is desiccantcooling which will be used at the Stockholm Arena. This method is used in airhandling units that use temperature changes and moisture fluctuations in the air. Oneof the steps is to add heat during the cooling process in order to reduce the relativehumidity of the exhaust air. The air passes thru an adsorptions rotor which thenabsorbs moisture from the supply air. This results in the closing stages that the supplyair temperature drops when hydrating and the result is a cooler indoor temperaturethan the outdoor. This report is a result of a diploma work in building construction at UppsalaUniversity and is written as a guide for the Stockholm Arena to reduce theconsumption of purchased thermal energy, with the aim of producing its own energy.This is reported from a technical perspective, focusing at the design of a propersystem. Heat energy is today planned to be brought from district heating. It couldthou be replaced by other alternatives such as solar panels. To determine this, itinvestigates whether and to what degree solar panels can replace the district heat atthe cooling process of the indoor air from a technical perspective. This has beenimplemented with literature studies and interviews and further on calculations ofenergy but also financially by the annuity method. The case is focused on the summer conditions when the sorptive refrigeration willbe used. According to that calculations and assumptions have been made for probableenergy consumption and production. There after the investment costs weredetermined. The results gave that flat glazed solar collectors had a lower cost based on theenergy production but it required a much larger area than the vacuum solarcollectors. Based on the investment cost, vacuum solar collectors would be lesseconomi-cally significant. Further analysis showed that the solar panels took up almost the same amount ofarea whether of choosing them to stand free or be placed right on the roof. Theinvestigations of the operating temperature of the heating coil gained 60 degreesCelsius to optimize the performance. The size of the storage tank should not exceed3 cubic meters to obtain adequate energy changes. Solar energy is added to the tankat an external heat exchanger. At times when the heat input from the solar panels islower than required the district heat is the most appropriate kind to provide externalheat. This heat is given to the hot water slope leaving the tanks so it won’t disrupt theenergy output from the solar panels. In converted case where the production of heatis greater than required the heat energy can be used for hot water production.

  • 152.
    Wessberg, Magnus
    et al.
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Historisk-filosofiska fakulteten, Konstvetenskapliga institutionen, Kulturvård. Czech Tech Univ, Dept Instrumentat & Control Engn, Fac Mech Engn, Tech 4, Prague 16607 6, Czech Republic;Czech Tech Univ, Ctr Adv Aerosp Technol, Fac Mech Engn, Tech 4, Prague 16607 6, Czech Republic.
    Vyhlidal, Tomas
    Czech Tech Univ, Dept Instrumentat & Control Engn, Fac Mech Engn, Tech 4, Prague 16607 6, Czech Republic;Czech Tech Univ, Ctr Adv Aerosp Technol, Fac Mech Engn, Tech 4, Prague 16607 6, Czech Republic.
    Broström, Tor
    Uppsala universitet, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Historisk-filosofiska fakulteten, Konstvetenskapliga institutionen, Kulturvård.
    A model-based method to control temperature and humidity in intermittently heated massive historic buildings2019Inngår i: Building and Environment, ISSN 0360-1323, E-ISSN 1873-684X, Vol. 159, artikkel-id 106026Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The indoor climate of historic buildings is governed not only by human comfort but also the desire to preserve these buildings and their interiors. For preservation, relative humidity is the most important parameter, including its amplitude and change rate. To control the change rate of relative humidity at a heat-up event for an intermittently heated massive historic building with heavy masonry walls, a simplified model for heat and moisture transfer at the heat-up time is presented. A method to derive the time constants and hygrothermal parameters of the building from measurements taken during a step response test is proposed and validated. The model with its parameters can be used to predict both heat-up time to reach the target temperature as well as the amount of moisture gained from the walls. These predictions are in turn used to calculate the decrease in relative humidity during the heat-up event. The indoor air relative humidity is predictable as it is determined by the air temperature and air mixing ratio. A control algorithm that uses the model for predicting and controlling the change rate of relative humidity by shaping the heating power is presented and validated using simulation results.

  • 153.
    Wistrand, Matilda
    Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Geovetenskapliga sektionen, Institutionen för geovetenskaper.
    Byggnadsutformningens inverkan på energianalysen: En jämförande utvärdering av två energisimuleringsprogram2011Independent thesis Basic level (professional degree), 10 poäng / 15 hpOppgave
    Abstract [en]

    Since the demands from authorities regarding lower energy consumption havebecome increasingly strict, this puts new pressure on designers and builders, who notonly have to ensure an esthetically pleasing building, but also make sure it issufficiently efficient to pass under new laws and regulations.This thesis takes into consideration a wide range of various parameters and theireffect on a building’s energy consumption. For this evaluation a computer softwarecomparison between the two programs Autodesk Ecotect Analysis and AutodeskProject Vasari was performed.Autodesk Ecotect Analysis is better suited for studies made on individual factors whileAutodesk Project Vasari is better used in experiments regarding the geometricalshape of the stucture itself.The results from the two different software tools used, give us both differences andsimilarities. For instance, both software programs produced the same resultsregarding the importance of the windows of the buildings to ensure a highly energyefficient building, both when it comes to the windows size and their U-value.

  • 154.
    Åhgren, Marcus
    Högskolan på Gotland, Avdelningen för Kulturvård.
    Skydda så långt möjligt: den lokala kulturmiljövårdens hantering av kulturvärden i kulturlandskap och kulturmiljöer - en analys av fyra kulturmiljöprogram2011Independent thesis Basic level (degree of Bachelor), 10 poäng / 15 hpOppgave
    Abstract [en]

    The responsibility to identify, protect, look after and develop cultural and historical values in our surroundings - urban as well as rural - falls on the local authorities. This essay focus on local preserve programs for cultural landscapes in Sweden’s municipalities. Programs for preserving cultural landscapes are important tools in the aim to reach a sustainable development of these values. The object of the essay is to delineate how the municipalities handle cultural landscapes in terms of how cultural and historical values is identified, how the landscape is divided and assessed and how different aspects of intangible and tangible values are taken into consideration. The author has adopted an approach inspired by the academic ethnology where the individual and her identity are focused. In the initial study of relevant literature the essay refers to the ethnologic anthology “Moderna landskap” (Modern Landscapes), which discuss the individual and her mutual connection to the surrounding landscape where she lives. An archeological approach on the same subject is also referred to, as well as the pioneering work “Kulturvårdsprogram för Grangärdsbygden” (Cultural preserve program for Grangärdesbygden) and the Burra Charter. Based on the studied literature as a theoretical frame of reference, local cultural preserve programs for cultural landscapes from four Swedish municipalities are analyzed: Nacka, Vallentuna, Lund and Södertälje.

    The guiding principles for the outline of the programs were developed in the end of the 1970’s by the Swedish National Heritage Board and The National Board of Housing, Building and Planning. The aim was to make historical and cultural values a part of the physical planning of society, as4well as to contribute to a preservative attitude towards these values by the public at large.

    The analysis of the programs made in plain that all four municipalities have deviated from the ambitions of the National Heritage Board. The programs were supposed to consist partly of a fixed part with a historical analyze of the cultural landscape in the municipality in general as well as selected landscapes, and partly of a plan of action open for revise. Accordingly the preservation programs of cultural landscapes were meant to be an active program but have now turned into a passive document, consisting solely of selected and valued landscapes. And it does not address to the public but act only as an instrument of physical planning. Without plan of action and connection to the public, the municipalities fail to secure a long-term preservation of the landscapes as well as missthe chance to let the programs be a part of the development of the concerned areas. But the programs could work as a solid base in the engagement and responsibility of the public in this matter, concerning historical and cultural values in our cultivated and built environment. The individual is unfortunately missing as a collaborator in the preservation process.

    The outline of the four analyzed programs varies. The two programs of Nacka and Vallentuna represent opposite poles. Nacka has produced a traditional preservation program with landscapes delimited selected into narrow areas of high values. The concerned landscapes correspond to a character that is similar to that of cultural reserves. This leads to the risk of future fragmentize of the landscape as a whole, due to the fact that only a small part of the cultural landscape of the municipality is included in the local authorities’ ambition to preserve. The rest is “unexplored regions”. Vallentuna on the other hand has produced a program that characterizes the landscape at whole, at the expense of details such as close descriptions of physical structures.

    The tangible presuppose the intangible. A cultural landscape is an intangible fact as well as a tangible, and because of this, the intangible dimension must be regard to in the same way as we today assess tangible values. Public engagement in the preservation process and the consideration of intangible values becomes one and the same aim, because the engagement of the individual can be a method to identify intangible valuesin the cultural landscape. It is also an opportunity to handle the rich information of the landscape, a landscape that work as a vast and complex phenomenon. The responsibility to secure cultural and historical values5in our environment is then no longer a question only for the local authorities; it is a question for one and all.

1234 151 - 154 of 154
RefereraExporteraLink til resultatlisten
Permanent link
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf