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Mahmoudi, Jafar
Publications (2 of 2) Show all publications
Akbari, K. & Mahmoudi, J. (2008). Simulation of Radon Mitigation in Residential Building. In: Proceedings of SIMS 2008: . Paper presented at 49th SIMS Conference on Simulation and Modelling, Oslo, Norway, October 7-8 2008, (pp. 177-183).
Open this publication in new window or tab >>Simulation of Radon Mitigation in Residential Building
2008 (English)In: Proceedings of SIMS 2008, 2008, p. 177-183Conference paper, Published paper (Refereed)
Abstract [en]

There are many indoor pollutants in the residentia lbuildings. Of those radon is a major and harmful indoor pollutant in most countries. Radon sometimes entries to the house through building materials. High insulation and tightness in order to increase energy efficiency and to lower energy costs is led to the indoor air quality problems. Ventilation is a good method to dilute radon contaminant and maintain indoor air quality. The more fresh air is brought into the indoor environment, the better the indoor air quality can be achieved, if the fresh air comes from non polluted ambient source. However ventilation can consume a lot of energy (currently 29-59% of energy building use), especially in cold climate same as Sweden, energy consumption could be much more. Though for coping with high energy consumption the building tightness is acted very well, but for ventilation plays against. This contradiction makes a poor indoor air quality. The aim of this paper is to simulate and visualize radon treatment and mechanical ventilation rates for achieving to indoor air quality. The Fluent (CFD) program software is employed for simulation.

National Category
Civil Engineering
Identifiers
urn:nbn:se:mdh:diva-1243 (URN)978-82-579-4632-6 (ISBN)
Conference
49th SIMS Conference on Simulation and Modelling, Oslo, Norway, October 7-8 2008,
Available from: 2008-10-10 Created: 2008-10-10 Last updated: 2022-10-26Bibliographically approved
Firouzifar, S. & Mahmoudi, J. (2007). Assessment of Power Transformer Cooler with FEMLAB. In: The 48th Scandinavian Conference on simulation & modelling (SIMS 2007): . Paper presented at The 48th Scandinavian Conference on simulation & modelling (SIMS 2007), Gothenburg, Sweden, 30-31 October, 2007 (pp. 159-165).
Open this publication in new window or tab >>Assessment of Power Transformer Cooler with FEMLAB
2007 (English)In: The 48th Scandinavian Conference on simulation & modelling (SIMS 2007), 2007, p. 159-165Conference paper, Published paper (Refereed)
Abstract [en]

The significance of overload in power system has increased substantially due to of consumption and ambient temperature rise. An important consideration when evaluating the impact of overload is their on power system ambient tem-and load. Transformers are major components in power systems. The increase useful lifetime and hence abnormal temperature rise. Existing standards give a procedure to determine the capability of an existing transformers subject to overload problem and ambient temperature rise based on conservative assumptions .in addition, the temperature oil rise of power transformer due to overloading and ambient temperature are estimated based on power and cooling system, and the average daily or monthly temperatures to which a transformer would be subjected while in service. it is the purpose of this research of this effort to quantify the decreased life time due to overloading and the corresponding temperature rise in transformers. This is accomplished using a 2-D FEMLAB Model adapted for cooling simulation in power transformers.

Series
Linköping Electronic Conference Proceedings, ISSN 1650-3686, E-ISSN 1650-3740 ; 27:19
Keywords
Transformer, Overload, temperature, Ambient, cooling Femlab
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-1385 (URN)
Conference
The 48th Scandinavian Conference on simulation & modelling (SIMS 2007), Gothenburg, Sweden, 30-31 October, 2007
Available from: 2008-10-16 Created: 2008-10-16 Last updated: 2022-10-14Bibliographically approved
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