درخت حوزه‌های تخصصی

Climate is one of the many factors such as socio-cultural values, economics, materials, administrative factors and technology that influence architectural forms. The climatic solutions effecting on architecture, differ in various regions, cultures, time and technology. The climate of the province of Golestan plays an active role in the formation and diversity of vernacular dwellings. This region is in contact with numerous environmental factors. It is limited by Alborz Mountain in the south, by Turkmenistan desert in the north-east, and by Caspian Sea in the north-west bringing about high humidity in this province. With this background, the paper's question raised: "How do the climatic design principles of vernacular architecture respond to microclimates in this region?" In this paper, the focus is on building's envelopes and shells in three local climatic scopes of the region. The paper is based on a combination of research methodologies: field research (integrating case studies) and archival research. The climatic data are being analyzed by Mahoney tables providing preliminary design recommendations. They are grouped under eight headings: layout, spacing, ventilation, openings (size, position and protection), the relation between building and ground, veranda, wall and roof. This essay argues about the knowledge and skill of vernacular and traditional bioclimatic construction suggesting conceptual strategies for improve current dwelling aiming to a sustainable future.

In our present research, we focus on the modeling of airflow related to natural disasters, such as sand accumulation, with urban form studies. The objective is to find which urban form can promote sand passing and reduce as much as possible stagnation of sand in the building area (streets, alleys, etc.). The urban form design will be discussed through the simulation of airflow by using Computational Fluid Dynamics (CFD). In terms of simulation, we simulated the airflow behavior, which is responsible of sand stagnation in some specific configurations. A flat ground was chosen with a first configuration, which was varied to test each time a current airflow behavior in this configuration. This modeling is made possible following an appropriate turbulence model. In this study, a correlation was made between urban wind speed and morphological parameters such as aspect ratio, building geometry and building density. According to our theoretical references, this correlation shows that urban wind speed can help reduce sand stagnation with proper values of these parameters. Therefore, through the urban form study we can promote wind speed and blow away the accumulated sand till the urban limits.

Thermal comfort is one of the key factors for achieving energy saving in the buildings. In the survey of thermal comfort, psychological aspects are as important as the physical parameters such as temperature and relative humidity. If thermal comfort could be achieved by using non–physical parameters, a significant energy and cost would be saved. The aim of this study is to investigate the effect of changing the color of inward daylight (into cool/warm), on sensation of thermal and visual comfort. This study was conducted to answer these questions: to what extent can the lights, which are traditionally called cool and warm, cause the real sensation of cold and heat? What is their influence on thermal and visual comfort? And what is the effect of changing the color of transmitted light on the occupant’s sensation of illumination? Research method is descriptive–analytical; in this study, thermal and visual effects of changing the color of inward light from the windows is surveyed, by using questionnaires, in three naturally ventilated high–schools; and the results were compared with the outputs of PMV simulation analysis. The results show that changing the inward light to a cool color (blue) and a warm color (red) resulted in a difference of 0.33°C in the sensation of thermal comfort. Moreover, the AMV in all cases had a neutral temperature below the PMV’s neutral temperature which was simulated by the software. In lower illuminance levels (lower than 300 lux) blue light aroused more visual satisfaction; but in higher illuminance levels (more than 300 lux), simple windows produced the best visual satisfaction. Red light produced the least visual satisfaction amongst these three. While, blue and red glazing generated better distribution of light in the room, than the witness group.