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  • 1.
    Holmberg, Roy
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Beräkning av värme- och fuktöverföring i roterande värmeväxlare1981In: VVS-Special, no 1, p. 37-42Article in journal (Other (popular scientific, debate etc.))
  • 2.
    Holmberg, Roy
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Frost i roterande värmeväxlare behöver inte ge påfrostning1982In: VVS: Tidskrift för energi- och vvs-teknik, ISSN 0346-4636, Vol. 53, no 6, p. 87-90Article in journal (Other academic)
  • 3.
    Holmberg, Roy B.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Combined Heat and Mass Transfer in Regenerators with Hygroscopic Materials1979In: Journal of heat transfer, ISSN 0022-1481, E-ISSN 1528-8943, Vol. 101, p. 205-210Article in journal (Refereed)
  • 4.
    Holmberg, Roy B.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Geringe Vereisungsgefahr bei Wärmerückgewinnern mit rotierenden Speichermassen1983In: HLH Heizung, Lüftung/Klima, Haustechnik, ISSN 1436-5103, Vol. 34, no 6, p. 242-246Article in journal (Other academic)
  • 5.
    Holmberg, Roy B.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Heat Transfer in Liquid-coupled Indirect Heat Exchanger Systems1975In: Journal of heat transfer, ISSN 0022-1481, E-ISSN 1528-8943, Vol. 97, p. 499-503Article in journal (Refereed)
  • 6.
    Holmberg, Roy B.
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Josefsson, Ingemar
    Rieselbefeuchter mit nichtbrennbaren Einsätzten1983In: TAB (Technik am Bau), ISSN 0341-2032, no 1, p. 47-49Article in journal (Other academic)
  • 7.
    Holmberg, Roy B.
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Strindehag, Ove
    A Liquid coupled system for Heat Recovery from Exhaust Gases1975In: Building Services Engineer, Vol. 43Article in journal (Other (popular scientific, debate etc.))
  • 8.
    Holmberg, Roy
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Strindehag, Ove
    Effektreglering i vätskekopplade värmeåtervinningssystem1977In: VVS, Vol. 48, p. 81-85, 93Article in journal (Other (popular scientific, debate etc.))
  • 9.
    Holmberg, Roy
    et al.
    Jönköping University, School of Engineering, JTH, Civil Engineering.
    Strindehag, Ove
    Vätskekopplade värmeåtervinningssystem1981In: VVS-Special, no 1, p. 21-28Article in journal (Other (popular scientific, debate etc.))
  • 10.
    Jalilzadehazhari, Elaheh
    et al.
    Linnaeus University, Växjö, Sweden.
    Vadiee, Amir
    Mälardalens högskola, Vasteras, Sweden.
    Johansson, Peter
    Jönköping University, School of Engineering, JTH, Civil Engineeering and Lighting Science.
    Achieving a trade-off construction solution using BIM, an optimization algorithm, and a multi-criteria decision-making method2019In: Buildings, ISSN 2075-5309, E-ISSN 2075-5309, Vol. 9, no 4, p. 1-14, article id 81Article in journal (Refereed)
    Abstract [en]

    The Energy Performance of Building Directive obligated all European countries to reduce the energy requirements of buildings while simultaneously improving indoor environment quality. Any such improvements not only enhance the health of the occupants and their productivity, but also provide further economic benefits at the national level. Accomplishing this task requires a method that allows building professionals to resolve conflicts between visual and thermal comfort, energy demands, and life-cycle costs. To overcome these conflicts, this study exploits the incorporation of building information modelling (BIM), the design of experiments as an optimization algorithm, and the analytical hierarchy process (AHP) into a multi-criteria decision-making method. Any such incorporation can (i) create constructive communication between building professionals, such as architects, engineers, and energy experts; (ii) allow the analysis of the performance of multiple construction solutions with respect to visual and thermal comfort, energy demand, and life-cycle costs; and (iii) help to select a trade-off solution, thereby making a suitable decision. Three types of energy-efficient windows, and five types of ground floors, roofs, and external wall constructions were considered as optimization variables. The incorporation of several methods allowed the analysis of the performance of 375 construction solutions based on a combination of optimization variables, and helped to select a trade-off solution. The results showed the strength of incorporation for analyzing big-data through the intelligent use of BIM and a simulation in the field of the built environment, energy, and costs. However, when applying AHP, the results are strongly contingent on pairwise comparisons. 

  • 11.
    Joshi, S. V.
    et al.
    School of Mechanical and Building Sciences, VIT University, Vellore, India.
    Sainis, Salil
    School of Mechanical and Building Sciences, VIT University, Vellore, India.
    D'Souza, M.
    Suzlon Energy Limited, One Earth, Pune, India.
    Quantitative performance evaluation of a wind turbine generator cluster using statistical techniques2014In: Energy Procedia, ISSN 1876-6102, E-ISSN 1876-6102, Vol. 54, p. 211-220Article in journal (Refereed)
    Abstract [en]

    This report dissects the analysis of annual performance of a cluster of wind turbine generators operated by Suzlon Energy Limited to troubleshoot shortfalls in the predicted generation of individual machines for the fiscal year of 2011-12. The first phase involved an estimation of the annual energy production using wind resource assessment on the commercial software Wind Atlas, Analysis and Application Program (WAsP). Comparison of the Annual Energy Production (AEP) with direct extrapolation of monthly generation to centum machine and grid availability highlighted negative inconsistency between the two in the case of five machines. Detailed study of their data histories indicated the reason to be coarse extrapolation and generation curtailment, although the latter is a minor contributor. The second phase consists of quantification of these losses for the concerned machines using statistical extrapolation and a variety of data approaches. A qualitative comparison of the methods is presented based on accuracy and utility. It is concluded that correlation of average hub-height wind velocities with the concerned machine's generation yields the most reliable and professionally useful results. Also, the advantages and shortcomings of the other methods have been discussed. 

  • 12.
    Jägerbrand, Annika K.
    et al.
    Statens väg- och transportforskningsinstitut, Miljö, MILJÖ.
    Hellman, Fredrik
    Statens väg- och transportforskningsinstitut, Väg- och banteknik, VBA.
    Energiutvinning ur vägar och vägmiljöer: en kunskapsöversikt2014Report (Other academic)
    Abstract [en]

    The report aims to identify new technologies for energy harvesting and the ability to use them in the road and the surrounding road area. The survey focuses on the materials and methods that may be used in the Swedish (cold) climate. The report can be useful for planning of new infrastructure when you want to make use of renewable energy and wants to reduce the environmental impact. Considering today’s technological conditions, the following techniques may be relevant: photovoltaics, geothermal energy, piezoelectric technology, wind energy or bioenergy. There are, however, many factors holding back the development of new innovative systems for energy production in roads and their environment. Some important factors are for example that maintenance costs will increase or that the maintenance of the road will become more difficult.

  • 13.
    Lora, Ruben
    et al.
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Namjoshi, Jayesh
    Jönköping University, School of Engineering, JTH, Mechanical Engineering.
    Simulation of Residual Stresses in Castings2008Independent thesis Basic level (degree of Bachelor), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    This work presents a study and implementation of the simulation of residual stresses in castings. The objects of study are a cast iron truck Hub part (provided by the company Volvo 3P) and an optimized version of the Hub resulting from the application of a topology optimization process. The models are solved through an uncoupled thermo-mechanical solidification analysis, performed both in the FE commercial software Abaqus and the FD commercial software Magmasoft and the results are compared. First, a thermal analysis is carried out where the casting is cooled down from a super-heated temperature to room temperature. The thermal history obtained, is then used as an external force to calculate the residual stresses by means of a quasi-static mechanical analysis, using a J2-plasticity model. The simulation procedures are explained through a simplified model of the Hub and then applied to the geometries of interest. A results comparison between the original Hub and its optimized version is also presented. The theoretical base is given in this work as well as detailed implementation procedures. The results shows that the part subjected to the topology optimization process develop less residual stresses than its original version.

  • 14.
    Mølmen, L.
    et al.
    RISE Research Institute of Sweden, Borås/Lund, Sweden.
    Alexandersson, A.
    RISE Research Institute of Sweden, Borås/Lund, Sweden.
    Leisner, P.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. RISE Research Institute of Sweden, Borås/Lund, Sweden.
    Surface technology should improve PEM fuel cell performance2019In: Transactions of the Institute of Metal Finishing, ISSN 0020-2967, E-ISSN 1745-9192, Vol. 97, no 3, p. 112-114Article in journal (Refereed)
    Abstract [en]

    Leading industrial nations are investing in hydrogen technology as energy storage solution with fuel cells as the main converter to electric energy. Improvements in the performance of the key components: electrode catalyst, bipolar plates and polymer electrolyte membrane are needed to reduce costs for mass-market introduction. Consequently, surface technology has an essential role in meeting the goals. 

  • 15.
    Nordh, Andreas
    Jönköping University, School of Engineering, JTH, Product Development.
    CFD and Experimental Study of Heat Exchangers for Transient Heating Application2016Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Global warming is a problem to the environment and a threat to the lifestyle people have today. The average temperature around the world is increasing and it is mainly because the increased amount of greenhouse gases in the atmosphere. Emissions of greenhouse gases are mainly caused by using fossil fuels to create electricity. The problem investigated in this thesis study originates from a company that intends to create electricity by means of renewable energy sources. The energy is transferred from thermal energy to kinetic energy and from the kinetic energy, electricity is generated with a generator.

    The company’s system is operating with standard components with insufficient efficiency. Advancement to the next level is depending on finding a solution to improve the performance of their main component in the system. The main component is a brazed plate heat exchanger that is used to transfer heat from one medium to another. Process cycle is strongly dependent on the time it takes to heat and cool the media inside the heat exchanger. The objective of this thesis is to analyze the transient behavior of heat exchangers and with this information compare two construction types to show what type is more appropriate to use inside the system.

    Evaluation is made experimentally and with means of Computational-Fluid-Dynamics (CFD) where two CFD-tools are evaluated. To create a reference case to compare results against, the model of the heat exchanger used today is created as a reference model. The reference model is compared to experimental measurement to show the validity of the simulation set-up. From design guidelines received from the company, an alternative construction type is chosen and compared towards the plate heat exchanger. The tube-fin heat exchanger with continuous plates across a bundle of tubes is parametrically studied. The best-determined concept is compared to the plate heat exchanger.

    Evaluation of the CFD-tools shows that two identical geometries with identical set-up can give a difference in the results based on the tool chosen for the simulation. It is shown by results that the transient behavior of heat exchangers in a CFD-simulation have a general agreement with experimental results. The agreement depends on the control of the experimental set-up. The comparison between the best concept and the reference model shows that the difference in average gas temperature during 5 seconds of transient heating is at most 1.1 degrees. Construction types is therefore also evaluated on material-cost, thermal mass and guidance from heat exchanger handbooks.

    The results indicate that the tube-fin heat exchanger is more suitable to use in the system. It reduces material, reduces environmental impact and matches the performance of the industrial plate heat exchanger.

1 - 15 of 15
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