Different types and applications of natural ventilation in buildings

If the ventilation is natural, then it is very good but if your home is not having any natural ventilation then you have to take steps and workout for improving ventilation to your home. It is one of the essential features for any home. There are different types of ventilation which you can use to ensure that your home is properly aerated.

Different types and applications of natural ventilation in buildings

Ventilation analysis[ edit ] The ventilation study in buildings is done to find the thermally comfortable environment with acceptable indoor air quality by regulating indoor air parameters air temperature, relative humidity, air speed, and chemical species concentrations in the air.

CFD finds an important role in regulating the indoor air parameters to predict the ventilation performance in buildings. The ventilation performance prediction provides the information regarding indoor air parameters in a room or a building even before the construction of buildings.

This is because the design of appropriate ventilation systems and the development of control strategies need detailed information regarding the following parameters; Airflow Contaminant dispersion Temperature distribution The aforesaid information is also useful for an architect to design the building configuration.

From the last three decades, the CFD technique is widely used with considerable success in buildings. A ventilation study can be done using wind tunnel investigation experimentally or by CFD modeling theoretically.

Natural ventilation system may be preferred over the forced ventilation system in some applications, as it eliminates or reduces the mechanical ventilation system, which may provide both fan energy and first-cost savings.

CFD analysis is quite useful than the experimental approach because here other related relations among the variables in post-processing could be found.

The data obtained either experimental or numerically is useful in two ways: Flow around a building collection of air at height and delivering it at ground level Figure-1 b: Flow around a building center of the front face Earlier, the choice of dwelling location was made mindful of the need for water, so most of earlier development started in valley area.

Different types and applications of natural ventilation in buildings

In present era, due to advancement in science and technology, it becomes easy to select a proper orientation, site and location of buildings based on local geographical and environmental conditions. In selection of building site and location, wind loading plays and important role.

Applications - natural ventilation

In case of two buildings at a location exists side by side having some gap, when volume of wind blows round the ends of building through the gap is, in first instant the sum of flow around each building separately, then its velocity must increase above that around the end of a single building at the expense of pressure loss.

So, there will be a built of pressure, entering the gap, which will lead to higher wind loads on the sides of buildings. When wind blows over the face of a high rise building, a vortex is created by the downward flow on the front face as shown in figure The wind speed in the reverse direction near the ground level may have percent of the reference wind speed.

So, if any building exist in such region, then that may be subjected to damage especially the roof of building may get severe damage. Such damage to buildings can be prohibited successfully, if the effects of wind loading are considered in the early stage of construction of a building.

In early age of construction all these wind loading effects were determined by the wind tunnel test, but today all these test can be successfully through CFD analysis. The importance of providing pleasant environment to buildings is increasing. CFD approach for heat transfer analysis in buildings[ edit ] CFD technique can be used for the analysis of heat transfer in each part of a building.

CFD technique finds the solution by following ways: Discretization of the governing differential equation using numerical methods Finite difference method has been discussed.

Solve the discretized version of equation with high performance computers. Discretization of the governing differential equations for the steady state heat transfer analysis[ edit ] Consider a building having a plane wall with thickness L, heat generation e and constant thermal conductivity k.

The FDM technique presumes that temperature varies linearly in walls shown in figure FDM solution is for all interior nodes except to 0 and last node:Very broadly, ventilation in buildings can be classified as ‘natural’ or ‘mechanical’.

Mechanical (or forced) ventilation is driven by fans or other mechanical plant.

New build & existing buildings

Natural ventilation is driven by pressure differences between one part of a building and another, or . Fresh air - or make up air - requirements - recommended air change rates - ACH - for typical rooms and buildings - auditoriums, kitchens, churches and more Sponsored Links The volume of fresh air (make up air) required for a proper ventilation of a space is determined of the size and the use of the space - typical the no.

of persons in the space, if smoking is allowed or not and pollution from processes. Natural ventilation provides the needed amount of good air quality through a natural process of allowing air in and out of buildings through the windows in . The range of vents types, actuators and controls means there is a large degree of flexibility is how you deploy a natural ventilation system.

When natural ventilation systems are designed from the ground up, they benefit by getting us involved in the early stages of a project to advise and present options. Without comfort ventilation, adequate air exchange in new buildings can only take place by means of regular purge ventilation.

In order to achieve an air exchange of about ach (air change per hour), one would have to open the windows wide for 5 to 10 minutes every three hours – even at night!

Ventilation. Ventilation moves outdoor air into a building or a room, and distributes the air within the building or room. The general purpose of ventilation in buildings is to provide healthy air for breathing by both diluting the pollutants originating in the building and removing the pollutants from it (Etheridge & Sandberg, ; Awbi, ).

Types of Ventilation Systems