1,721,043 research outputs found
Short-term airing by natural ventilation - modeling and control strategies
No full textThe need to improve the energy efficiency of buildings requires new and more efficient ventilation systems. It has been demonstrated that innovative operating concepts that make use of natural ventilation seem to be more appreciated by occupants. This kind of system frequently integrates traditional mechanical ventilation components with natural ventilation devices, such as motorized windows and louvers. Among the various ventilation strategies that are currently available, buoyancy driven single-sided natural ventilation has proved to be very effective and can provide high air change rates for temperature and IAQ control. However, in order to promote a wider applications of these systems, an improvement in the knowledge of their working principles and the availability of new design and simulation tools is necessary. In this context, the paper analyses and presents the results of a research that was aimed at developing and validating numerical models for the analysis of buoyancy driven single-sided natural ventilation systems. Once validated, these models can be used to optimize control strategies in order to achieve satisfactory indoor comfort conditions and IA
Measurement of Air change rate and ventilation carachteristic during short term transient phenomena
No full textShort Term Airing by Single Sided Natural Ventilation – Part 2: Comparison of Experimental Results and Model Predictions
No full textShort-term airing by natural ventilation - Modeling and control strategies (Indoor Air (2009) 19 (357-380))
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Short Term Airing by Natural Ventilation - Implication on IAQ and Thermal Comfort
No full textThe need to improve the energy efficiency of buildings requires new and more efficient ventilation systems. It has been demonstrated that innovative operating concepts that make use of natural ventilation seem to be more appreciated by occupants. Among the available ventilation strategies that are currently available, buoyancy driven, single-sided natural ventilation has proved to be very effective and can provide high air change rates for temperature and Indoor Air Quality (IAQ) control. However, to promote a wider distribution of these systems an improvement in the knowledge of their working principles is necessary. The present study analyses and presents the results of an experimental evaluation of airing performance in terms of ventilation characteristics, IAQ and thermal comfort. It includes investigations of the consequences of opening time, opening frequency, opening area and expected airflow rate, ventilation efficiency, thermal comfort and dynamic temperature conditions. A suitable laboratory test rig was developed to perform extensive experimental analyses of the phenomenon under controlled and repeatable conditions. The results showed that short-term window airing is very effective and can provide both acceptable IAQ and thermal comfort conditions in buildings.The need to improve the energy efficiency of buildings requires new and more efficient ventilation systems. It has been demonstrated that innovative operating concepts that make use of natural ventilation seem to be more appreciated by occupants. Among the available ventilation strategies that are currently available, buoyancy driven, single-sided natural ventilation has proved to be very effective and can provide high air change rates for temperature and Indoor Air Quality (IAQ) control. However, to promote a wider distribution of these systems an improvement in the knowledge of their working principles is necessary. The present study analyses and presents the results of an experimental evaluation of airing performance in terms of ventilation characteristics, IAQ and thermal comfort. It includes investigations of the consequences of opening time, opening frequency, opening area and expected airflow rate, ventilation efficiency, thermal comfort and dynamic temperature conditions. A suitable laboratory test rig was developed to perform extensive experimental analyses of the phenomenon under controlled and repeatable conditions. The results showed that short-term window airing is very effective and can provide both acceptable IAQ and thermal comfort conditions in buildings
The use of vegetation for social housing renovations: A case study in the City of Palermo
No full textThe paper shows the first results of a research carried out at the University of Palermo, which aims to indentify sustainable strategies for the renovation of social housing in the Mediterranean Basin, with focus on the use of vegetation as strategy for the enhancement of urban microclimate and thermal comfort.
To achieve these goals the social housing complex of Medaglie d’Oro in the city of Palermo was chosen as case study in order to carry out some analyses for the assessment of outdoor comfort parameters of the area.
By means of numerical simulations performed with the software ENVI-met, the actual state of the area was evaluated and four scenarios of renovation strategies through the integration with different vegetal species were proposed. The simulations show the effectiveness of the vegetation for the mitigation of the outside temperature and demonstrate that more accurate analyses on building indoor comfort can be performed taking into account the factors that influence its surrounding environment
Numerical simulation of inter-flat air cross-contamination under the condition of single-sided natural ventilation
No full textMeasuring air temperature in glazed ventilated façades in the presence of direct solar radiation
No full textCFD simulation of inter-flat air cross-contamination - A possible transmission path of infectious diseases
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