Building Services- Ventilation

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<p>Slide 1</p> <p>Building ServicesVENTILATION &amp; WIND FLOW </p> <p>By -Akshay (04) Balraj (14)Ciby (16)Ketan (Manita (37)CONTENTSIntroductionFunction of natural ventilationSupply of fresh airStack due to thermal forceConvective coolingWind simulatorsPhysiology codingAir movement through building &amp; around the buildingFactors affecting indoor air flow &amp; Around buildingWind shadow INTRODUCTIONClimate means a region with a certain condition of temperature, dryness, wind, light, etc..It is rather an integration in time of physical states of atmospheric environment, characteristics of geographical location.</p> <p>Weather is the momentary state of atmospheric environment at a certain location .Climate can be called the integration of time of weather condition.Climate has 4 major elements:- EARTH soil WATER humidity FIRE sun and temperature AIR wind</p> <p> Climatology is all about the study of these elements</p> <p>ARCHITECTURAL CLIMATOLOGYArchitecture is all about ART and TECHNOLOGY.It includes public services, water supply and drainage, air conditioning, ventilation, lighting, etc.it is the basic science a designer is concerned about.It involves majorly on:- climatic elements how they are behaving on us how to be benefited by these climatic elements how to protect ourselves from the adverse effect of climatic elements</p> <p>The major steps in architectural climatology are:- climatology-study of climatic elements biology-study of human comfort level with respect to climatology technology-creating of built environment architecture -the combination of the above and the final product</p> <p>Ventilation requirements fordifferent workplaces are varied because of different indoor activities and building designs. The basic methods for control of airborne contaminants are: elimination or control of sources fresh air supply of contaminants proper air distribution air filtration (purification) removal of contaminated airFactors needed to be taken into account in designing the ventilation requirement include: the nature of the operations or activities the toxicity and rate of generation of hazardous substances the degree of expected occupancy the design of the premises.Function of natural ventilation</p> <p>(+)ve and (-)ve wind pressures around different building configurations</p> <p> VENTILATIONVentilation is the movement of air within a building and between the building and the outdoors. Control of ventilation is most subtle yet important concerns in building design.</p> <p>Supply of fresh airVentilation is a process by which air is removed from and supplied to premises simultaneously.To supply fresh air to meet the respiratory needs of the occupants. To remove airborne contaminants such as dusts, mists, gases, vapour tobacco smoke, body odors and bacteria which may pose health hazards or nuisance to the occupants.To maintain the temperature and humidity within an acceptable range that is appropriate to the activities on the premises.</p> <p>Stack due to thermal forceAll practical steps have been taken by means of collectors, scrubbers, or process changes to reduce the contaminant discharge rates to of reducing emission rates.Wind blowing past a stack aspirates air or flue gas out of the stack. During wind gusts, there are like surges in outflow from the stack.Stacks must be designed and located for satisfactory cooperation during all wind conditions.Wind flow around stacks creates negative zones, eddies, and vortices in the same manner as around buildings.</p> <p>Convective cooling"Convection is the transfer of heat energy by the movement of matter." There are a few points in that short statement that aren't quite right but it is adequate for most situations.Convection is probably the form of heat transfer that we are most familiar with. We heat our houses with convection (using 'radiators'), we heat our food in convicting saucepans and fan ovens and we lose most of our excess body heat through convection. Convection may be familiar, unfortunately it is also fiendishly complicated</p> <p>Air movement through building &amp; around the buildingIN BUILDING DESIGN there are many basic criteria that are of doubtful ancestry. Nevertheless, they seem to be firmly embedded in the minds of the architectural, engineering, and construction fraternity. Lack of understanding of air flow around buildings and of wind and rain conditions seems to be the basis for some of this folklore . For example, many texts stress the need for locating, buildings and their air inlets and outlets to take advantage of the prevailing winds. Stack caps and ventilation inlets and outlets are frequently designed for nearly vertical rain</p> <p>Factors affecting indoor air flow &amp; Around buildingNatural ventilationis the process of supplying and removingairthrough an indoor space without using mechanical systems. It refers to the flow of external air to an indoor space as a result of pressure or temperature differences. There are two types of natural ventilationoccurring in buildings:wind driven ventilationandbuoyancy-driven ventilation. While wind is the main mechanism of wind driven ventilation, buoyancy-driven ventilation occurs as a result of the directional buoyancy force that results from temperature differences between the interior and exterior</p> <p>(1) window openings,(2) atria and courtyards,(3) wing walls,(4) chimney cowls/exhaust cowls,(5) wind towers,(6) wind catchers and(7) wind floor air inlet system.(8) solar chimneys and(9) underground ventilation ducts</p> <p>Factors affecting indoor air flow &amp; Around building</p> <p>Wind shadow</p> <p>BIBLIOGRAPHY www.wikipedia.com www.google.com </p>

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