Abstract
Objective. The article addresses the process of heat and mass transfer in outer envelope structure with internal heat insulation. To prevent condensate formation, it is proposed to use a ventilated air duct inside the wall structure. Methods. The study was carried out using numerical simulation methods. Air movement in the duct was described by solving the Navier-Stokes equation in k-ε approximation. Condensate formation was analysed via joint resolution of heat conduction and diffusion equations. The problem of heat and mass transfer was addressed for a structure with internal heat insulation, behind the layer of which an air duct was located with air movement occurring due to natural or forced convection. Results. As part of the work, it was shown that the use of an air duct significantly reduces the thermal resistance of the structure, and an increase in the airflow rate leads to a decrease in thermal resistance and the likelihood of condensate formation. A decrease in thermal resistance with an increase in air flow rate into interlayers occurs faster than an increase in the amount of air-entrained moisture. Conclusion. Results of the work have shown that the use of an air duct throughout the entire period of operation of a building is not effective, but it is proposed to use this duct periodically in winter to dry the condensate.
Highlights
The article addresses the process of heat and mass transfer in outer envelope structure with internal heat insulation
Condensate formation was analysed via joint resolution of heat conduction and diffusion equations
The problem of heat and mass transfer was addressed for a structure with internal heat insulation, behind the layer of which an air duct was located with air movement occurring due to natural or forced convection
Summary
1,2, Добросмыслов С.С.,1Рожкова Н.Н.,1Рожков А.Ф.,1Перькова М.А.,1Алиев С.А. 1Красноярский научный центр Сибирского отделения Российской академии наук, 1660036, г. Для предотвращения выпадения конденсата предлагается использовать вентилируемый воздушный канал внутри стеновой конструкции. Решение задачи тепло и массообмена осуществлялось для конструкции при наличии внутреннего утепления; за слоем внутреннего утеплителя размещалась воздушный канал, в котором происходит движение воздуха при естественной или вынужденной конвекции. В рамках работы было показано, что использование воздушного канала существенно снижает тепловое сопротивление конструкции, причем повышение скорости воздушного потока приводит к уменьшению теплового сопротивления и снижению вероятности выпадения конденсата. As part of the work, it was shown that the use of an air duct significantly reduces the thermal resistance of the structure, and an increase in the airflow rate leads to a decrease in thermal resistance and the likelihood of condensate formation. Целью данной работы является исследование режима функционирования наружной ограждающей конструкции при наличии внутреннего утепления для оптимизации режима работы вентиляционного канала. Расчетная схема конструкции 1 – керамзитобетон, 2 – воздушный зазор, 3 – плиты минераловатные из каменного волокна, 4 – верхняя решетка АМН-К 300x150, 5 – нижняя решетка АМН-К 300x150, 6 – многопустотные плит перекрытия, 7 – воздушный канал, 8 – штукатурный слой (цементно-песчаный раствор)
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