1. ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria AIR FLOW AROUND BUILDINGS ARC 810: APPLIED CLIMATOLOGY DEPARTMENT OF ARCHITECTURE, FEDERAL UNIVERSITY OF TECHNOLOGY, AKURE, ONDO STATE, NIGERIA.

2. ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria LIST OF SUBTOPICS 2.1Introduction 2.2Wind Pressure and Suction 2.3Effect of Other Buildings 2.4The Wind Shadow Effect

3. ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria 2.1 INTRODUCTION The wind flow around a building plays an important role in determining the air flow pattern within the building. Data concerning wind speed and direction are gathered during site analysis.

4. ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria 2.1 INTRODUCTION FACTORS AFFECTING AIR FLOW AROUND BUILDINGS ARE: The shape of the building. Height of the building. Orientation of the building. Planning of the building.

5. ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria 2.2 WIND PRESSURE AND SUCTION The wind creates a pressure on the windward-side of the building and suction of the leeward side. The wind is deflected over the roof and around the sides of the building, creating a suction.

6. ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria WIND PRESSURE AND SUCTION contd. At an angle to a rectangular and L-shaped buildings, wind pressure is experienced on the two windward sides while suction is experienced on the other two.

7. ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria 2.3 EFFECT OF OTHER BUILDINGS The proximity and height of neighbouring buildings affect wind flow patterns.

8. ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria ARC 810: Building Climatology Department of Architecture, Federal University of Technology, Akure, Nigeria 2.4 THE WIND SHADOW EFFECT The area where suction is effective is the wind shadow of the building. Wind shadow results in poor ventilation. Buildings spaced at least six times their height and staggering are remedies.