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Types of ventilation

There are several commonly known types of ventilation:
• According to the method of pressure generation and air handling: ventilation system of a naturally driven type and ventilation system of a mechanically driven type
• According to the usage: intake and exhaust systems
• According to  the method of handling air exchange: forced ventilation and zonal ventilation
• According to structure of ventilation system: duct  and duct-free fans

Natural ventilation
In case of natural ventilation air exchange is carried out by difference of the pressure inside and outside the building.
• Free natural system of ventilation involves air exchange that is carried out by means of the pressure difference inside and outside the building and  wind action through leakiness in cladding structure,  roofing, doors and through open vents and transom doors.  
Organized and controlled natural ventilation is  air exchange carried out by means of  the pressure difference between indoor and outdoor air through controllable specially fitted inflow and exhaust openings.

In Thailand houses are commonly built with free natural ventilation. Fresh air freely flows around the house.
As a result, you have to constantly cool outdoor air, which is a daunting task as hot  outdoor air keeps coming inside the house.

If you are building energy-efficient or energy independent house, you have to create a system which will guarantee necessary inflow of fresh air without affecting microclimate at a minimum price.
Calculations:
In order to evaluate amount of energy required to cool the air inside a building we use the following calculation:

Conclusion: as it is seen from the example, for creating comfort temperature inside your buidling of 100 м² you consume 3 kW of energy.
This calculation is done for an ideally insulated house. If there's constant temperature leakage in your house you consume much more energy!
What's more, if your building loses the volume of cooled air in the whole place within one hour, you keep running up expenses (3kW) necessary for creating comfort temperature in your house every hour of your air conditioning in the on-mode!
In Thailand many people buy houses with windows and roofs leading to constant inflow of outdoor air. They have to keep turning on air conditioners and yet they are unable to maintain the desirable temperature.
If you  multiple the number of hours your air conditioners work per day by   3kW (for a house of 100м²) and by the cost of 1kW you will be able to see how much money you waste!
Then, multiply it by a number of days in a month and you will be able to see how much you pay for Thai comfort.
If you seriously consider finding the ways of proper air exchange organization and cutting down costs, learn more about technology of geothermal ventilation.