Michaela Meir
University of Oslo
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Publication
Featured researches published by Michaela Meir.
Energy and Buildings | 2003
J. Rekstad; Michaela Meir; A.R. Kristoffersen
A new approach of temperature control and energy metering in low temperature heating (LTH) systems is presented. The required heat is supplied in terms of energy pulses by intermittent operation of the circulation pump. The control unit calculates the heat demand from external variables basically represented by the ambient air temperature. The parameters necessary for temperature control can be extracted when the heat transfer coefficient and the heat capacity of the floor construction are known. Furthermore, the control strategy opens for energy metering in LTH systems by means of the parameters heat carrier temperature and the duty cycle. The method is demonstrated to be at least accurate within ±5%.
Solar Energy | 2002
L. Henden; J. Rekstad; Michaela Meir
Abstract The performance of two kinds of solar systems for space- and domestic hot water heating has been compared by computer simulations. One system is a conventional radiator-based heating system with collectors of ‘ideal’ collector coefficients. The second system is a low temperature heating system with solar collectors of moderate efficiency. The investigation shows that the difference in performance of the two systems is in the order of 1–6%.
Solar Energy | 2002
Michaela Meir; J. Rekstad; M. Peter; L. Henden; Bjornar Sandnes
Abstract A calorimetric method is applied to determine the solar system performance by in-situ measured data. The heat store is interpreted as a calorimeter and the information on charge and discharge is extracted from the shape analysis of the heat store’s temperature profile. The method is applicable to any heating system which includes a heat store. In the present paper, this procedure is presented and applied to determine the solar gain for a large solar system for domestic hot water preparation and a solar combisystem. The uncertainty of this method is in the range of ±10%. The results obtained by the calorimetric method are compared to TRNSYS simulations.
Energy Policy | 2011
Pernille Seljom; Eva Rosenberg; Audun Fidje; Jan Erik Haugen; Michaela Meir; J. Rekstad; Thore Jarlset
Energy and Buildings | 2015
J. Rekstad; Michaela Meir; Espen Murtnes; Aylin Maria Dursun
Solar Energy Materials and Solar Cells | 2008
Anders Olivares; J. Rekstad; Michaela Meir; Susanne Kahlen; Gernot M. Wallner
Applied Energy | 2014
Bo Carlsson; Helena Persson; Michaela Meir; J. Rekstad
Solar Energy Materials and Solar Cells | 2010
A. Olivares; J. Rekstad; Michaela Meir; Susanne Kahlen; Gernot M. Wallner
Solar Energy | 2010
Susanne Kahlen; Gernot M. Wallner; Reinhold W. Lang; Michaela Meir; J. Rekstad
Archive | 2000
J. Rekstad; Bard Bjerke; Michaela Meir
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