Cross ventilation (wind effect ventilation)Ĭross ventilation is one of the natural cooling methods relies on the effect of wind on the inlets and the forces in the outlets to exit the warm and humid air out of the buildings. Stack ventilation operates with some simple principles which are the base of the pressure differential and the air circulation in the whole system. As pressure drops are very important in stack ventilation, ducts should try to be straight and vertical on the other hand, it is hard to place and construct a building to use these passive systems.Design and installation of stack ventilation systems are very sensitive, and much care and caution should be applied to prevent over and under ventilation.Providing controlling dampers or closing inlets would be necessary for this kind of passive ventilation. For example, imagine a windy or rainy day that leads to over-ventilated and much more humidity and air velocity. Outside weather affects the quality of ventilation strongly and controlling systems are required.So this ventilation system should be used only for new buildings. We cannot change or retrofit stack ventilation after construction unless a refurbishment is necessary.We should consider a larger duct for air and may need fans in the inlets and outlets to help air ventilation and overcome pressure drop in the system.Some disadvantages in stack ventilation systems may cause problems in the buildings and the effort for reaching the desired system would be increased. The operation doesn’t have any noise and works all the time silently.Maintenance and running costs in the system tend to be zero.Installation is much less than other methods, while you don’t need any mechanical instruments or heating recovery systems.It is the most energy-efficient ventilation system and does not need any supply of electricity.The advantages of stack ventilation are listed below and can tempt you to use in your structure. In some cases, stack ventilation is not enough for the structure, and many other equipment and devices would be necessary for the property. Stack ventilation is a cheap and efficient system but has some defects which make the designing process complex and difficult. The outdoor environment and the neighborhood buildingsĪdvantages and disadvantages of the Stack ventilation.Shape, type, location, and orientation of the doors and windows.Location and orientation of the structure.Some of the designing parameters are as below: Stack ventilation design guidelinesĭesigning robust stack ventilation requires items to be considered, and in most of the buildings, mechanical, solar, and winds would help the natural convection. stack ventilation can be an independent system in constructions or as a supporting ventilation system boosted by many different devices or ventilation strategies. The warm air has a lower density rather than the cold air and raises to the upper part of the building, chimney, towers, etc. Stack effect or chimney effect is a phenomenon that occurs because of the natural heat transfer. Natural heat convection and stack ventilation can provide comfort without energy supplies and are a completely cost-efficient, maintenance-free, and passive method. Using Building height, wind, and chimney for making air ventilation and removing combustion products are date back to BC and all around the world in different histories, using thermal draft was a common method for buildings’ ventilation. Humankind used Stack ventilation a long time ago for temperature comfort and removing chimney ashes. Warehouse Equipment and Supplies Companies.
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