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Natural ventilation
The document presents a comprehensive overview of natural ventilation, emphasizing its role in enhancing indoor comfort through techniques like the stack effect, wind towers, and the courtyard effect. It discusses the importance of building orientation, opening position, and the characteristics of different types of ventilation systems in achieving effective air movement without relying on mechanical means. The aim is to minimize external energy usage while ensuring thermal comfort and natural daylighting in architectural design.
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Natural ventilation
- 1. NATURAL VENTILATIONPresentation By-Ar. Roopa Chikkalgi1
- 2. NATURAL VENTILATION ISTHE PROCESS OF SUPPLYING AND REMOVING AIR THROUGH A SPACE BY NATURAL MEANS IT CAN BE ACHIEVED WITH OPENABLE WINDOWS OR VENTS. NATURAL VENTILATION AND AIR MOVEMENT CAN BE SIMPLY ACHEVIED BY ‘STRUCTURAL CONTROLS’ AS IT DOES NOT DEPENDS ON ANY FORM OF EXTERNAL ENERGY SUPPLY OR MECHANICAL INSTALLATION. WHAT IS NATURAL VENTILATION ? Presentation By- Ar. Roopa Chikkalgi 2
- 3. • THE PURPOSEOF PROVIDING NATURAL VENTILATION IS TO ACHIEVE MAXIMUM HUMAN COMFORT IN INDOOR BY UTILIZING MAXIMUM NATURAL ENERGY AND RESOURCES. WHY NATURAL VENTILATION ? Presentation By- Ar. Roopa Chikkalgi 3
- 4. DIFFERENT TECHNIQUES TOACHIEVE NATURAL VENTILATION:- • STACK EFFECT • WIND TOWER • COURTYARD EFFECT Presentation By- Ar. Roopa Chikkalgi 4
- 5. STACK EFFECT :- STACKEFFECT DEPENDS ON THERMAL FORCES AND DIFFERENCE IN TEMPERATURE . REASON OF STACK EFFECT :- • PRESSURE DIFFERENCE BETWEEN THE OUTSIDE AIR AND THE AIR INSIDE THE BUILDING CAUSED BY DIFFERENCE IN TEMPERATURE Outdoor air Outdoor air Section Presentation By- Ar. Roopa Chikkalgi 5
- 6. STACK VENTILATION SECTIONS:- TALL ROOMS TALL ROOMS AT EDGE STAIRS AS STACKTALL ROOMS WITHIN Presentation By- Ar. Roopa Chikkalgi 6
- 7. WIND TOWER • AIRENTERS IN WIND TOWER THROUGH OPENINGS- COOLED DOWN- BECOMES HEAVIER AND SINKS DOWN ( PRESENCE OF AIR MOVEMENT) • AFTER WHOLE DAY AIR EXCHANGE – TOWER BECOMES WARM IN THE EVENING . • TOWER WALLS ABSORBS HEAT DURING DAYTIME AND RELASES AT NIGHT WARMING COOL NIGHT AIR AT NIGHT. • A TYPICAL WIND TOWER SECTIONPresentation By- Ar. Roopa Chikkalgi 7
- 8. • EVAPORATIVE COOLING DIFFERENT TYPESOF WIND TOWERS :- WATER SUPPLY MULTI DIRECTIONAL WIND CATCHER Presentation By- Ar. Roopa Chikkalgi 8
- 9. COURTYARD EFFECT:- DUE TOINCIDENT SOLAR RADIATION IN A COURTYARD, AIR GETS WARMER AND RISES , COOL AIR FROM GROUND LEVEL FLOWS THROUGH THE LOWER OPENINGS RADIATION TO SKY LANDSCAPE OR WATER BODY SECTION SHOWING COURTYARD EFFECT Presentation By- Ar. Roopa Chikkalgi 9
- 10. COURTYARDS IN MODERNBUILDINGS :- AMERICAN INSTITUTE OF INDIAN STUDIES (GURGAON):- VIEW SUNKEN COURTYARD INSIDE THE BUILDING WITH WATER BODY AND LANDSCAPE PLAN Presentation By- Ar. Roopa Chikkalgi 10
- 11. •NATURAL VENTILATION EXTERNALFEATURES:- • ORIENTATION OF BUILDINGS • POSITION OF OPENINGS • CROSS VENTILATION • SIZE OF OPENINGS • OPENING TYPES Presentation By- Ar. Roopa Chikkalgi 11
- 12. MASSING AND ORIENTATIONOF BUILDING:- • AS A GENERAL RULE, THIN TALL BUILDINGS WILL ENCOURAGE NATURAL VENTILATION AND UTILIZE PREVAILING WINDS, CROSS VENTILATION, AND STACK EFFECT. • TALL BUILDINGS ALSO INCREASE THE EFFECTIVENESS OF NATURAL VENTILATION, BECAUSE WIND SPEEDS ARE FASTER AT GREATER HEIGHTS Tall buildings improve natural ventilation, and in lower latitudes reduce sun exposure. Presentation By- Ar. Roopa Chikkalgi 12
- 13. OPENING SIZE:- Pairing alarge outlet with a small inlet increases incoming wind speed. SMALL INLETLARGE OUTLET Presentation By- Ar. Roopa Chikkalgi 13
- 14. OPENING TYPE:- OPENING CANBE ANY TYPE ACCORDING TO THE BUILDING TYPE AND CLIMATIC CONDITION Presentation By- Ar. Roopa Chikkalgi 14
- 15. CROSS VENTILATION:- WINDOWS ORVENTS PLACED ON OPPOSITE SIDES OF THE BUILDING GIVE NATURAL BREEZES A PATHWAY THROUGH THE STRUCTURE.Presentation By- Ar. Roopa Chikkalgi 15
- 16. VARIOUS TECHNQUES USEDFOR NATURAL VENTILATION:- DOUBLE APERTURES USED FOR ENSURING VENTILATION WINDOW FOR VIEW AND JALI VENTILATION COLUMN COURTYARD COOLING SYSTEM-DIWAN E-KHAS, RED FORT, DELHI • MULTI-DIRECTIONAL WINDCATCHER Presentation By- Ar. Roopa Chikkalgi 16
- 17. Natural cooling systemof jaisalmer • Dense clustering of buildings • Sun control through orientation and structural projections • Massive construction for roofs and walls • Courtyards and other air ducts for ventilation. Plan of jaisalmer Presentation By- Ar. Roopa Chikkalgi 17
- 18. Plan middle incomehouses in jaisalmer • This type of houses have two or three storey structures and can be considered as the typical houses of jaisalmer , these have additional rooms and has a balcony projecting on to the street. Presentation By- Ar. Roopa Chikkalgi 18
- 19. Streets of jaisalmer •There are major streets oriented almost E-W and minor streets are right angle to these. • This compact structure of the housing doesn’t allow the sun rays to penetrate , and also serve as device of shading. Presentation By- Ar. Roopa Chikkalgi 19
- 20. SCOPE – • TOMINIMIZE THE EXTERNAL ENERGY OR MECHANICAL SYSTEM. • IMPLEMENTATION OF NATURAL VENTILATION SYSTEM- NATURAL DAYLIGHTING CAN BE PROVIDED. • THERMAL COMFORT CAN BE ACQUIRED WITH LESS ECONOMICAL BUDGET Presentation By- Ar. Roopa Chikkalgi 20