Showing 4 results for Natural Ventilation
Dr. Mohammadjavad Mahdavinejad, Soha Matoor, Amene Doroodgar,
Volume 21, Issue 2 (12-2011)
Abstract
Mosque architecture is considered as a potent visual symbol of the Islamic architects’ design ability. Prayer-hall as the
manifestation of equality between the believers and the unity of architectural space has challenged such an ability throughout the
history. This study, considering the characteristics of light-openings in the domes of Iranian mosques’ Prayer-hall, aims to
investigate these domes’ possible relationship with the climatic features of each mosque. To this end, eighteen case-studies
according to the research analytic approach are studied to determine: 1. the relationship between the mosques construction period
(Iranian architecture styles) and its light-openings number on the one hand and its climatic features on the other hand, 2. The
relationship between the light-openings’ location and the climatic features of each mosque, 3. The relationship between the lightopenings’
number and the climatic feature of each mosque and finally, 4. The relationship between the prayer-hall’s
height and the number of light openings of each mosque on the one hand and its climatic feature on the other hand. The study shows
that Iranian architects have given considerable priority to the natural ventilation function of the light-openings, So, what used to
be considered as the domes' main function, allowing the light to the interior space, is considered as their secondary function.
E. Nabizadeh Shahrebabak, S. Golafshan, M.r. Chamani,
Volume 26, Issue 1 (6-2016)
Abstract
One of the main architectural characteristics in the central area of Iran is the relation between life and climatic conditions; e.g., the four-seasonal house which is a typical kind of the central-yard house. As the climate of Isfahan is more pleasant than other desert regions in the central part of Iran, wind towers are replaced with skylights to ventilate the pool area of hoze-khane. So far, several researches have been carried out to study the stack effect characteristics and to review wind tower performance. In this paper, a case study is carried out to investigate the effect of the skylight of Mosaver-al-Molki house on the flow pattern and natural ventilation. The performance of skylight on the internal air flow patterns as an effective tool in improving the natural ventilation is investigated by using the Ansys Fluent software. Other elements which have been discussed in this paper are the vault and the columns. These elements have a distinguished effect on distribution of inlet streams in different parts of the hoze-khane. Analysis of the simulation results were obtained for wind velocities of 2.5 m/s and 8 m/s. The numerical results show that wind speed of 2.5 m/s has better performance than wind speed of 8 m/s in terms of ventilation.
M. Mohammadi, Z. Barzegar,
Volume 29, Issue 2 (12-2019)
Abstract
Wind catchers are one of the most prominent masterpieces of Iranian traditional architecture. In arid climate, it can improve thermal comfort through natural ventilation. With the aim of recognizing the impact of this masterpiece on thermal comfort, this research examined the effect of wind on summer ambient temperature by employing PMV. To this end, wind catchers of Salehi's House was selected. To investigate the function of wind catchers in Shiraz, enjoying a semi-arid climate, temperature, humidity and wind were measured by data logger TA120 between 9:00 to 16:00. Afterwards, PMV and PPD were obtained through Fanger Formula. The results based on wind and in the case when the wind catcher and openings are close and open showed that the amount of thermal comfort was directly related to the amount of wind coming from the wind tower. It was also concluded that the average ambient temperature in ground was declined by 0.8 °C and in the first floor it was declined by 0.9°C.
Mohsen Mohammadi, Zahra Ghiabaklou, Hamed Moztarzadeh,
Volume 34, Issue 3 (7-2024)
Abstract
High temperatures and air pollution are significant challenges in ensuring fresh air supply in the hot-humid climate of Asalouye City. These conditions compel residents to rely heavily on mechanical cooling, which subsequently escalates energy consumption and deteriorates indoor air quality. The primary air pollutants include Particulate Matter (PM), Volatile Organic Compounds (VOCs), and microorganisms. Fiber filters and electrostatic filters are the most common methods for purifying PMs from the air, with the electrostatic method offering advantages such as high efficiency, the ability to remove a wide range of particles, low-pressure drop, and no need for frequent replacement. This study proposed a ventilation system integrating a window,
a precipitator using electrostatic technology, a cooling coil, and an exhaust fan. The system's performance was evaluated using CFD simulation in Ansys-Fluent software (2021) to assess its effectiveness in reducing PM concentrations, pre-cooling incoming air, and maintaining the standard ventilation rate. The findings revealed that at air velocities of 6 m/s and 1 m/s, the system could completely remove copper, nickel, and sulfur particles with diameters of 0.1 µ and 10 µ. Additionally, the distance between the system's air inlet (window opening) and its air outlet (where air enters the interior) significantly influences the particle reduction level. The proposed cooling coil, however, only managed to reduce the air temperature by 2°C. In the absence of wind, an exhaust fan with a pressure jump of at least 250 Pa or 500 Pa is necessary to achieve the standard airflow and ventilation rate.
