جستجوی مقالات مرتبط با کلیدواژه « Air sealing » در نشریات گروه « مکانیک »

Study of air infiltration in a building is highly important from several aspects, such as energy, air quality, thermal comfort and pollution entrance to the building. In this paper, the effect of new gaskets on air infiltration rate of doors and windows was investigated. To do this, existed gaps between the common doors and windows of Iran were simulated and by installing eight various gaskets, with different material and cross sections, the air infiltration rates at different pressure differences were obtained. The objective of this study was to evaluate the airtight performance of different gaskets, in order to select the right type, as well as providing air infiltration rate data for caulking doors and windows for designer engineers. Results showed different airtight performance for various gaskets, in which, at higher pressures differences could reach up to six times. Data were fitted to the power-law model and the coefficients of the equation were obtained. Based on the results, practical recommendations for calculation of air infiltration rate from doors and windows were also given.

Nowadays, modern windows with standard caulking used in most buildings. Study of air infiltration and caulking this windows in several ways such as energy, indoor air quality, thermal comfort and pollution entering in the building is important. In this study consists of two parts, first experimentally investigated the airtight performance of various window gaskets. For this purpose, using 8 different types of gaskets and simulate modern window gap, air infiltration rates measured at different pressure differences. The results show that the airtight performance of various gaskets are different. Also fitted the experimental results by power low equation, and relations and coefficients for calculate air infiltration rate of modern windows (sealed windows), respectively. In the second section due to the very low air infiltration rate of the experimental results, indoor air quality assessed by numerical modeling methods. In the sample model, air infiltration of modern windows as ventilation and human breathing as a source of CO2 simulated. Indoor air quality is weighed by the CO2 concentration in the interior space. The results show that the air infiltration of window gaps to ensure air quality during the 8 hours is not enough. Then, assuming uniform distribution of CO2 in the sample space, and solve the transfer species equation for the problem situation, analytical equation for evaluating indoor air quality were achieved. Analytical results matches on numerical simulation results exactly. The results of this study can be very useful for HVAC engineers.

The uncontrolled flow of air from outside into the building through cracks and pores of the building happens, say air infiltration. Air infiltration into the building in several viewpoints, such as energy consumption, HVAC systems design, thermal comfort, indoor air quality and pollution and humidity is very important. According to many studies that have been conducted, air infiltration the reason 15 to 30 percent of and energy consumption and the heat load of the building, indicating the necessity of research on the subject. In general, three operating wind pressure, stack effect and HVAC systems has caused air infiltration in buildings, the impact of all three factors must be considered in the calculations. From the viewpoint of HVAC, the main issue is how to calculate the rate of air infiltration in the building. Heretofore several related analytical and experimental and standard tests for air infiltration rate of the different components of the building are presented. In this paper, some of the relations and equations presented in this issue have been studied. Finally the power low equation because of the accuracy and more applied to recent research, for calculating the rate of air infiltration in buildings is recommended.