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  • 1.
    Bergseth, Ellen
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
    Björklund, Stefan
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Machine Elements.
    Logarithmical Crowning for Spur Gears2010In: Strojniski vestnik, ISSN 0039-2480, Vol. 56, no 4, p. 239-244Article in journal (Refereed)
    Abstract [en]

    Gear tooth modifications, such as lead crowning, are often recommended to compensate for misalignment (e.g. assembly deviations). Lead crowning means that the tooth centre is slightly thicker than the tooth edges and is usually described as a circular arc profile. The use of crowning shifts the peak load from the tooth flank edges and, therefore, reduces the risk for high contact pressures at the edges, which can otherwise result in a shortened service life. In this study a logarithmical lead profile was compared with traditional lead profile modifications for gears. The profiles were applied on a spur gear pair and a numerical method for contact analysis was used to calculate the contact pressure distribution at the pitch diameter. All lead profiles were optimised with respect to low contact pressure at a specific normal load, a specified maximum misalignment in the plane of action and a tooth flank edge contact criteria. The results show that the logarithmical profile responds differently to misalignments compared to the traditional lead profile modifications. The logarithmical profile resulted in lower maximum contact pressures for small misalignments and is, therefore, of further interest in terms of achieving a robust gear design. (C) 2010 Journal of Mechanical Engineering. All rights reserved.

  • 2. Dovic, D.
    et al.
    Palm, Björn E.
    KTH, Superseded Departments, Energy Technology.
    Svaic, S.
    Visualtization of one-phase flow in chevron-plate heat exchangers end their performance2000In: Strojniski vestnik, ISSN 0039-2480, Vol. 46, no 7, p. 429-435Article in journal (Refereed)
    Abstract [sl]

    Modern plate heat exchangers with chevron corrugation patterns are spread across a range of applications both in one- and two-phase flow regimes due to their compactness and superior thermal-hydraulic performance when compared to the other types of heat exchangers. Recently a limited number of experimental studies have been undertaken to understand the influence of corrugation angles and the ratio of corrugation depth to,wave length (b/l) On the flow pattern and in turn on the heat transfer and pressure drop. In order to clarify this complex issue, visualization tests have been performed on a model of a Plate heat exchanger (PHE) having only a single channel composed of one metal and one plastic transparent plate with identical corrugation.

  • 3.
    Sakellari, Dimitra
    et al.
    KTH, Superseded Departments, Energy Technology.
    Lundqvist, Per Gunnar
    KTH, Superseded Departments, Energy Technology.
    Towards Energy-Use Optimisation of a Domestic Heating System based on a Heat Pump2001In: Strojniski vestnik, ISSN 0039-2480, Vol. 47, no 8, p. 506-511Article in journal (Refereed)
    Abstract [en]

    The overall efficiency of a heat pump system i.e. heat source, heat pump unit and distribution system, is strongly affected by the design temperature levels of the system. The temperature levels influence the performance, in every single process from the time that energy flows from the ambient to the heat source until the heat is released from the building envelope to the environment. The heat exchanging processes in every step affect the energy flow, the losses and generally the energy efficiency of the heating system. The objective of this paper is to show how the different temperature levels influence the energy efficiency and the performance of a heat pump system for domestic applications. The heat pump unit and the heat distribution system are approached as an integrated system. Hence, calculations are performed in order to estimate possibilities for energy savings and for improving the overall efficiency of a heating system based on a heat pump. The results show mainly the increasing call reducing the supply temperature of heat distribution systems. The influence of the refrigerant characteristics on optimal heat pump designs will be discussed.

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