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Search: WFRF:(Engdahl Ingrid 1952 ) > (2010-2014)

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  • Engdahl, Fredrik, et al. (author)
  • Optimal supply air temperature with respect to energy use in a variable air volume system
  • 2004
  • In: Energy and Buildings. - : Elsevier BV. - 1872-6178 .- 0378-7788. ; 36:3, s. 205-218
  • Journal article (peer-reviewed)abstract
    • In a variable air volume (VAV) system with 100% outdoor air, the cooling need in the building is satisfied with a certain air flow at a certain supply air temperature. To minimize the system energy use, an optimal supply air temperature can be set dependent on the load, specific fan power (SFP), chiller coefficient of performance, outdoor temperature and the outdoor relative humidity. The theory for an optimal supply air temperature is presented and the heating, ventilation and air-conditioning (HVAC) energy use is calculated depending on supply air temperature control strategy, average U-value of the building envelope and two outdoor climates. The analyses show that controlling the supply air temperature optimally results in a significantly lower HVAC energy use than with a constant supply air temperature. The optimal average U-value of the building envelope is in practise mostly zero. (C) 2003 Elsevier B.V. All rights reserved.
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  • Engdahl, Göran, et al. (author)
  • Key numbers in design of magnetostrictive actuators and generators
  • 2006
  • In: Actuator 2006. ; , s. 774-777
  • Conference paper (peer-reviewed)abstract
    • In order to compare and judge magnetostrictive actuator designs with different design parameters a number of novel figures-of-merit are presented. The use of the suggested key numbers is demonstrated regarding the assessment of three different bias magnetization approaches. The features of a magnetostrictive power harvesting device, a so called VIBEL (VIBrational ELectric energy), are studied by means of the suggested key numbers. A VIBEL is built up like a magnetostrictive actuator, but converts a mechanical force excitation into electrical power.
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  • Engdahl, Göran (author)
  • Modelling of Highly Magnetostrictive Materials
  • 1992
  • In: International Symposium on Giant Magnetostrictive Materials and their Applications, November 5-6, 1992, Tokyo, Japan.
  • Conference paper (peer-reviewed)
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  • Result 1-10 of 23

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