Transcript

Building Services

VENTILATION

& WIND FLOW

By -

Akshay (04)

Balraj (14)

Ciby (16)

Ketan (

Manita (37)

CONTENTS

•Introduction

•Function of natural ventilation

•Supply of fresh air

•Stack due to thermal force

•Convective cooling

•Wind simulators

•Physiology coding

•Air movement through building & around

the building

•Factors affecting indoor air flow &

Around building

•Wind shadow

INTRODUCTION

Climate 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.

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

Climatology is all about the study of these elements

ARCHITECTURAL CLIMATOLOGY

Architecture 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

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

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 air

Factors 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

(+)ve and (-)ve wind pressures around different building configurations

VENTILATION

Ventilation 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.

Supply of fresh air

•Ventilation 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.

Stack due to thermal force

•All 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.

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

Air movement through building &

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

Factors affecting indoor air flow &

Around building

Natural ventilation is the process of supplying and

removing air through 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 ventilation occurring in buildings: wind driven

ventilation and buoyancy-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

(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

Factors affecting indoor air flow &

Around building

Wind

shadow

BIBLIOGRAPH

Y

www.wikipedia.com

www.google.com


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