Question

design for natural ventilatin by wind action and by stack effact​

Answer 1

Answer:

aru here;

Natural ventilation is one of the most fundamental techniques to reduce energy usage in buildings. If the cooling capacity of ambient air can be harnessed to increase indoor thermal comfort, then the necessity for mechanical space conditioning lessens. Natural ventilation relies on natural forces: wind from the surrounding environment as well as buoyancy forces that develop due to temperature gradients within the building. Buildings can be designed to take advantage of either driving force or a combination of both. Though natural ventilation is an old technology, it has experienced a recent resurgence of interest, particularly in Europe where several major research initiatives have been conducted (Ghiaus et al., 2006; Op’t Veld, 2008).

Using natural ventilation in buildings offers additional benefits besides energy usage reductions. Research has shown that the acceptable thermal comfort range for natural ventilated buildings is significantly larger than for buildings with standard mechanical HVAC systems (De Dear and Brager, 2002). To this end, ASHRAE Standard 55 has been revised to include an adaptive thermal comfort standard specifically for naturally ventilated buildings, which allows for increasing indoor temperatures as outdoor temperature increases. The generally high level of occupant control associated with naturally ventilated buildings is also thought to contribute to the acceptance of warmer indoor temperature. Additionally, natural ventilation systems have been shown to consistently outperform mechanical systems with respect to complaints of Sick Building Syndrome (SBS) and its associated symptoms. Seppanen and Fisk (2002), in a review of 18 different studies on SBS and ventilation systems, found that the prevalence of SBS symptoms was 30%–200% higher in air conditioned buildings as compared to naturally ventilated ones. In general, when building occupants are more satisfied with their working environment, productivity and job satisfaction also increase. Thus, the benefits of using natural ventilation are significant even beyond the energy benefit.

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ram ram !