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  • 1.
    Blom, Jonas
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Industrial Development, IT and Land Management, Industrial economics.
    Optimizing spare-parts management2018Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    Purpose:

    The purpose of the study is to develop a model that will facilitate the choice of maintenance strategy within the Swedish pulp and paper industry. Without compromising system availability, the model aims to reduce inventory holding costs.

    Methodology:

    At first, a literary research was conducted to create a holistic view over the chosen topic, in time it developed into a literature framework. Secondly, a case study was conducted in order to obtain empirical data. The data were obtained through interviews and archival records. The literature framework and the empirical data were then cross-analyzed with each other.

    Findings:

    In this thesis, a model has been developed based on previously applied and accepted methods. The methods have been identified and described in order to provide a strategy in which the inventory levels- and value could be lowered. The findings indicate that the organization must seek to assign ABC-classified and VED-analyzed components different maintenance actions in order to reduce the total cost.

    Theoretical contribution:

    This thesis contributes to a methodology development regarding spare parts management. It aims to add knowledge to the existing gap regarding spare parts order point and batch size. The thesis provides a procedure in which systems including critical and expensive components are evaluated in order to assign them the appropriate maintenance.

    Practical relevance:

    The model has only been exemplified by using a system position from Stora Enso Skutskär, the numerical values are examples. The model must be tested with real values and the risk analysis must be carried out with a group of employees with great insight regarding the selected component and system position.

    Limitations:

    This thesis is delimited to spare parts management and inventory management. The study only involves one Swedish organization, whereas the organization and its spare parts management illustrates the complexity concerning spares. The model will not be verified as the focus is to highlight the research gap and to develop the model.

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    Optimizing spare-parts management
  • 2.
    Eriksson Skytt, Linda
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Brink, Christian
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Tvärkraftsförstärkning av limträ: En undersökning av metoder med förstärkningselement av träribbor2016Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The purpose of this thesis is to examine the shear capacity of glulam beams through various designs of reinforcement with wooden bars. A literature study is conducted to identify previous research on the subject. There are a number of tested reinforcement methods of glulam available, however, only a few of them are about shear capacity.

    This work is an extension of a previous study of Ahlskog and Ross (2015). Their study is based on a method where glulam beams were reinforced for shear breakage by strengthening wooden bars glued to the beam with PVAc.

    Five different test series have been examined for shear capacity. To obtain a statistical basis each series contained eight specimens. One series was unreinforced, two series were reinforced with glued wooden bars and two series were reinforced with milled in wooden bars. The reinforcement bars were put at an angle to take tensile or compressive force in the different methods.

    The capacity of the reinforcement bars is tested with a tensile and compressive testing machine which recorded deformation and compression force. The measured values were treated by a statistical analysis and normal distribution curves were drawn for the entire number of specimens based on the assumption that the test results were normally distributed. The four series were compared with both the unreinforced series and the other reinforced methods.

    The work resulted in an increase of shear capacity by 16% for the average of the sample series with milled in wooden bars subjected to compressive force. It has also been found that the characteristic value of shear capacity increased by 14% in the test series with the glued wooden bars exposed to traction.

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  • 3.
    Hallberg, Daniel
    et al.
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för byggnadskvalitet.
    Stojanovic, Bojan
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för byggnadskvalitet.
    Analytical and numerical thermal modelling & analysis of an building integrated unglazed solar collector: PhD course paper2007In: Mathematics for PhD-students in building science, Stockholm: Architecture and the Built Environment, Royal Institute of Technology , 2007Chapter in book (Other (popular science, discussion, etc.))
    Abstract [en]

    The objective of this report is to derive an analytical and numerical USC model for thermal analysis. These models are meant to calculate USC temperature variation across the USC duct as well as the fluid temperature along the USC. The main purpose of the analytical model is to attain a detailed steady state tool for USC (as in this report) design and dimensioning. The numerical model is meant to calculate the time dependant USC thermal performance as well as being a benchmark for the analytical model.

  • 4.
    Hedén, Caroline
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Wellpapp: Början på en ny våg2006Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
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    fulltext
  • 5.
    Lundström, Hans
    University of Gävle, Faculty of Engineering and Sustainable Development, BMG laboratory.
    Improving long-term stability of hot-wire anemometer sensors by means of annealing2015In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 86, no 8, article id 086104Article in journal (Refereed)
    Abstract [en]

    Annealing procedures for hot-wire sensors of platinum and platinum-plated tungsten have been investigated experimentally. It was discovered that the two investigated sensor metals behave quite differently during the annealing process, but for both types annealing may improve long-term stability considerably. Measured drift of sensors both without and with prior annealing is presented. Suggestions for suitable annealing temperatures and times are given. 

  • 6.
    Martinez, Pablo
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building Engineering, Energy Systems and Sustainability Science, Energy Systems and Building Technology.
    Quenching a steel plate by water - impinging jets and different simultaneous flow rates2019Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Regarding the great importance of fast cooling in steel industry for the production processes, a deep understanding of heat transfer and fluid dynamics must be held. A steel plate is heated up until a maximum temperature of 700 ⁰ C to be the n cooled down seconds later by a configuration of multi ple impinging water jets. Different flow rates are used simultaneously by different adjacent jets to perform quenching over the sample, so different hardness is obtained in the material over a small area . Temperature drop in time i s measured and monitored by embedded thermocouples and LabVIEW program. To achieve greater understanding of the quenching performance with different flow rates , several parameters are selected to be varied in order to achieve the best working conditions. Jet diameter takes values between 4 and 10 mm, initial temperature of quenching varies from 400 to 700 ⁰ C , subcooling temperature is tested for 65 and 75 K, and jet velocity varies between 1.9 and 3.9 m/s. The result of total number of 9 expe riments shown that v ariation of jet diam eter does not influence substantially on the cooling rate if flow rate is kept constant. High initial quenching temperature (600 - 700 ⁰ C ) led to slightly higher cooling rate in the stagnation region of water jets. The peak value of heat transfer rate in the upwash flow zone was more highlighted for initial quenching temperature 600 ⁰ C and below it. High er values of subcooling and jet velocity produce better cooling rates. The result shown higher jet velocity at one column of water jets changes position of upw ash flow slightly toward the adjacent column of jets with lower jet velocity. In general, the result shown that all the studied parameters did not have negative effect on obtaining various cooling rates over the steel plate.

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    Master Thesis
  • 7.
    Norberg, Peter
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för inomhusmiljö.
    Lösullsisolering med hampa2009In: Bygg & teknik, ISSN 0281-658X, no 5, p. 28-32Article in journal (Other (popular science, discussion, etc.))
    Abstract [sv]

    Lösullsisolering gjord av hampfiber varken tillverkas eller säljs som en kommersiell produkt i Sverige idag. Möjligheterna är emellertid goda att på olika sätt få igång en inhemsk lokal produktion. Beredning av fibrerna med tornadoteknik kan vara ett sätt att åstadkomma ett utgångsmaterial lämpligt för bl a lösull. Försök visar att lösullsprodukter av hampfiber går att åstadkomma med egenskaper som är likvärdiga de hos träbaserad cellulosaisolering.

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    FULLTEXT01
  • 8.
    Rajapakshe, Chinthana
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering. Royal Institute of Technology.
    HEAT STORAGE APPLICATION IN ELECTRIC MOTOR COOLING SYSTEM: SMOKE VENTILATION MOTORS2014Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
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  • 9.
    Samuelsson, Martin
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    En designguide för framtidens källsortering2013Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Abstract

    The aim was to examine people’s perceptions of recyclingon a personal and general level and based on thatdesigning an improved sorting product for today’s households. The goal was to present a documented knowledgebase about how future recycling products should bedesigned for the partner Hammarplast Consumer AB. From the users responses at the initial survey severalareas of concern were identified and dealt with using designmethodology and various analytical methods. The first questions that were examined were the placementof the sorting product in homes and which role thekitchen’s historical development has played for householdwaste management. Another question was if anew recycling product should be adapted for houses andapartments with specific years of construction or not andalso the amounts and volumes of waste today’s Swedishhouseholds are to manage. Throughout the project differentarguments and conclusions were visually explainedand examined through illustrations, photos, and othergraphical elements, and in the end it all boils down to apresentation of a new type of recycling product. Finally there is a discussion about the philosophy behindchoosing materials and which materials that is best suitedfor the generated concept from an economic, technicaland environmental perspective.

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    En designguide för framtidens källsortering
  • 10.
    Stojanovic, Bojan
    et al.
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för inomhusmiljö.
    Akander, Jan
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för byggnadskvalitet.
    Oglasade takintegrerade solfångare: Ett energitekniskt aktivt byggnadsskal2008In: Bygg & Teknik, ISSN 0281-658X, no 4Article in journal (Other (popular science, discussion, etc.))
  • 11.
    Stojanovic, Bojan
    et al.
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för byggnadskvalitet.
    Akander, Jan
    University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för byggnadskvalitet.
    Use of a Peltier Element to Increase Time of Wetness of Unglazed Solar Collector Specimens in a Natural Field Exposure Test2008In: Durability of Building Materials & Components 11 (11DBMC), Istanbul, Turkey, 11-14 May 2008, 2008, p. 1169-1175Conference paper (Refereed)
    Abstract [en]

    In accelerated testing, material specimens are exposed to completely artificial environments, where exposure to individual degradation agents is enhanced. In contrast, field-testing exposes specimens to multiple degradation agents. When performing a semi-natural test, the influence of a selected degradation agent may be increased while the specimen is still situated in its natural environment. Moisture is such an agent. In an experimental set-up for evaluating long-term optical performance of an building integrated Unglazed Solar Collector, a sub-task was to increase Time of Wetness (TOW) for several collector specimens for two reasons: to “simulate” an active cooling of the component as is the case for solar collectors; and to assess the role of TOW on optical degradation of the solar collector. Specimen cooling and increase in TOW was achieved by utilisation of a Direct-Air Peltier Element. TOW was estimated through measurements with WETCORR sensors (monitoring surface temperatures and moisture) and climate parameters (temperature and relative humidity) at site. At this particular test site in Gävle, Sweden, TOW was more than doubled in comparison to non-cooled surfaces. The Peltier Element proved to be inexpensive and flexible for this purpose.

  • 12.
    Wahlén, Johannes
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Building, Energy and Environmental Engineering.
    Förbättring av U-värde i träkonstruktion för fönster med Aerogel2013Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
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1 - 12 of 12
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