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  • 1.
    Janbakhsh, Setareh
    et al.
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology. University of Gävle, Department of Technology and Built Environment, Division of Energy and Mechanical Engineerin.
    Moshfegh, Bahram
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology. University of Gävle, Department of Technology and Built Environment, Division of Energy and Mechanical Engineerin.
    Ghahremanian, Shahriar
    Linköping University, Department of Management and Engineering. Linköping University, The Institute of Technology. University of Gävle, Department of Technology and Built Environment, Division of Energy and Mechanical Engineerin.
    A Newly Designed Supply Diffuser for Industrial Premises2010In: The International Journal of Ventilation, ISSN 1473-3315, E-ISSN 2044-4044, Vol. 9, no 1, p. 59-67Article in journal (Refereed)
    Abstract [en]

    The results of this investigation revealed the airflow distribution from a new design of supply diffuser under non-isothermal conditions. To illustrate the indoor climate parameters in the occupied zone, for both the heating and cooling seasons, an experimental investigation was carried out in industrial premises. The indoor climate was explored at ankle, waist and neck levels for a standing person at different positions, to determine the variation of the thermal comfort indexes and draught rating (DR) with position in the facility. The observed PPD and DR values indicate acceptable levels of thermal comfort in the facility for both summer and winter cases. The conclusion can be drawn that well-distributed airflow saves energy by removing the need for an additional heating and cooling systems during cold and hot weather seasons.

  • 2.
    Karlsson, Fredrik
    Linköping University, The Institute of Technology. Linköping University, Department of Mechanical Engineering, Energy Systems.
    Experimental Evaluation in a Low-Energy Building2006In: The International Journal of Ventilation, ISSN 1473-3315, E-ISSN 2044-4044, Vol. 5, p. 239-248Article in journal (Refereed)
  • 3.
    Karlsson, Fredrik
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Experimental evaluation of airflow in a low-energy building2006In: The International Journal of Ventilation, ISSN 1473-3315, E-ISSN 2044-4044, Vol. 5, no 2, p. 239-248Article in journal (Other academic)
    Abstract [en]

    This paper reports on tracer gas measurements of the ventilation flow within a low-energy building. Constant-concentration, decay and homogenous tracer gas emission methods were used. Low-energy buildings are airtight constructions; effective ventilation is thus very essential for the indoor climate. The results of this study show an airflow rate between 0.42 and 0.68 air exchanges per hour (ac/h), which should be compared to the minimum requirements in Sweden of 0.5 ac/h. It was found that the airflow changes with time and that the local mean age of air was different on different floors of the building and, to some extent, different at different heights.

  • 4.
    Larsson, Ulf
    et al.
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, Faculty of Science & Engineering. University of Gävle, Sweden.
    Moshfegh, Bahram
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, Faculty of Science & Engineering. University of Gävle, Sweden.
    Comparison of ventilation performance of three different air supply devices: a measurement study2017In: The International Journal of Ventilation, ISSN 1473-3315, E-ISSN 2044-4044, Vol. 16, no 3, p. 244-254Article in journal (Refereed)
    Abstract [en]

    People today spend a significant part of their time in an indoor environment, whether it be home, school, vehicle or workplace. This has put greater demands on indoor environment, in terms of both air quality and thermal comfort. The main objective of building ventilation is to take care of pollutants and lower their concentration, but it is also used to cool or heat indoor air. The aim of this paper was to study the behavior of three different ventilation supply devices, i.e. mixing supply device, displacement supply device and confluent jet supply device, in an office room. Different cases have been studied experimentally with different airflow rates, supply air temperature and supply devices. The results shows that mostly that we can expect, but the results show a very small difference in ventilation efficiency between the different systems and in theory there should be a larger difference.

  • 5.
    Moshfegh, Bahram
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Editorial - Ventilation 2009: The 9th International Conference on Industrial Ventilation Zurich, Switzerland, October 18th – 21st, 20092010In: The International Journal of Ventilation, ISSN 1473-3315, E-ISSN 2044-4044, Vol. 9, no 1, p. 45-45Article in journal (Other academic)
    Abstract [en]

    n/a

  • 6.
    Rohdin, Patrik
    et al.
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Dalewski, Mariusz
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology. International Centre for Indoor Environment and Energy, Department of Civil Engineering, Technical University of Denmark, Denmark.
    Moshfegh, Bahram
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Indoor Environment and Energy Use in Historic Buildings - Comparing Survey Results with Measurements and Simulations2012In: The International Journal of Ventilation, ISSN 1473-3315, E-ISSN 2044-4044, Vol. 10, no 4, p. 371-382Article in journal (Refereed)
    Abstract [en]

    Increasing demand for energy efficiency places new requirements on energy use in historic buildings. Efficient energy use is essential if a historic building is to be used and preserved, especially buildings with conventional uses such as residential buildings and offices. This paper presents results which combine energy auditing with building energy simulation and an indoor environment survey among the occupants of the building. Both when comparing simulations with measurements as well as with survey results good agreement was found. The two efficiency measures that are predicted to increase energy and thermal performance the most for this group of buildings were reduced infiltration and increasing heat-exchanger efficiency.

  • 7.
    Rohdin, Patrik
    et al.
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Moshfegh, Bahram
    Linköping University, Department of Management and Engineering, Energy Systems. Linköping University, The Institute of Technology.
    Variable Air Volume-Flow Systems: A Possible Way to Reduce Energy Use in the Swedish Dairy Industry2007In: The International Journal of Ventilation, ISSN 1473-3315, E-ISSN 2044-4044, Vol. 5, no 4, p. 381-392Article in journal (Refereed)
    Abstract [en]

    Growing concern about negative effects on the environment and increasing energy prices stress the importance of energy efficiency. Support processes such as heating, ventilation and air-conditioning (HVAC) use large amounts of energy in the dairy industry. In this paper the energy aspects of the support processes at two large dairies, built at three different points in time, are analyzed and compared with energy use throughout the rest of the company. Significant differences in the use of energy and the resulting indoor climate were found. One way to reduce the impact of increasing energy used by HVAC is to use Variable Air Volume-flow (VAV) systems. The potential for using VAV systems in the dairy industry is studied using a whole-site simulation for one of the sites. The simulations predict a potential for reducing space heating by 60%, and the amount of electricity used to run fans and compressors for air-cooling systems by 21%. This remarkable potential for reducing heat use is due to the dynamics of the process during the heating season. The indoor climate and energy simulation was carried out using the commercial code IDA ICE. The model has been validated with extensive measurements over an entire year. The predicted indoor air temperatures are in good agreement with the measured values. The use of VAV systems is concluded to be an effective energy efficiency measure for reducing the energy used by HVAC systems in the dairy industry.

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