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Air conditioning (often referred to as AC, A/C, or air con) is the process of removing heat and moisture from the interior of an occupied space to improve the comfort of occupants. (Source-wikipedia)
According to Leading air conditioner maker Daikin Industries Ltd., most units only circulate air already in the room and do not ventilate. So the company recommends occasionally opening windows even when using air conditioners.
This may strike some people as a waste of energy. But a Daikin official is of the opinion, there are ways to limit power consumption. For example, air conditioners consume a lot of energy when we turn them on, so it is actually more efficient to keep them on even when windows are opened.
According to the official, energy consumption will increase if we open a window and an influx of outside air pushes up the room temperature. This is a particularly big risk in hotter climates. So he says it's important to set your air conditioner at a slightly higher temperature than normal before you open any windows. This will help keep energy consumption down.
There are specific ways of opening windows to improve ventilation.
Window and door manufacturer YKK AP Inc. has launched a page on its website showing how to properly ventilate rooms.
The company suggests opening two windows instead of one, ideally ones that are "diagonally opposite each other."
The standard length of time and frequency to ventilate a house by opening windows is about 5-10 minutes per hour.
However, the speed in which air is discharged outside a building varies depending on such factors as window size, area of the room and type of pollutants floating indoors.
For this reason, it is difficult to accurately determine ventilation effectiveness and the degree to which ventilation can reduce the risk of infectious diseases.
Also the effect is higher when ventilation is performed twice an hour for five minutes than when it is performed once every two hours for ten minutes.
Consequently, the more often you ventilate your house, the greater improvement you will see in ventilation effectiveness.
For those worried about pollen, when ventilating with an open window, placing an air purifier near the window is somewhat effective in keeping pollen from entering the room. Lace curtains are also an effective measure against pollen.
METHOD FOR OPENING WINDOWS TO CREATE AN AIR PASSAGE
When ventilation is performed by opening windows, it is better to open two windows instead of one in order to create an air passage for efficient ventilation. It is even more efficient if the two windows are diagonal to each other.
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Source: www3.nhk.or.jp, www.daikinindia.com
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