From our experiments, we found out that you should decide to leave the air conditioner on or not during your absence by how long you are absent.
Also, the time varies by loss heat tendency of the room.
You should check the loss heat tendency by measuring temperature in 30 minuets.
If you use the simulation, you can find out the time which you should leave the air conditioner on or not.
Summary
We will show how you can save electricity consumption easily.
From our experiments...
・To save electricity consumption, there are two kinds of home appliances which should be turned off frequently and ones which should not be turned off so often such as air conditioners.
・For house lighting, utilizing the desk light is important to save electricity.
For economic use of air conditioners, turning off or putting the display to “SLEEP MODE” is effective because those displays creates a lot of heat.
Initial power
Easy energy saving method
New lighting unit, LED, is becoming popular. However we thought it is not realistic from an economic stand point to replace all light bulbs in your house to LED.
We will introduce a way to save electricity consumption focusing on the illuminance.
Over-illuminance is "MOTTAI-NAI".
| Illuminance | Living room | Study room | Western style | Kitchen | Bedroom | Housekeeping | Bathroom |
| 1000 | Handicraft/Sewing | Handicraft/Sewing | |||||
| 750 | Study/Reading | ||||||
| 500 | Reading | VDTwork | ReadingMakeup | Work | |||
| 300 | Dining table/sink | Shaving/Makeup | |||||
| 200 | Teamwork | Computer games | Washing | ||||
| 100 | General | General | General | ||||
| 75 | |||||||
| 50 | General | ||||||
| 30 | |||||||
| 20 | General | ||||||
| 5 | |||||||
| 2 | Late night |
From our experiment, utilzing LED desk light is effective instead of lighting the whole room with unnecessary illumination.
Without a desk light, illuminance on desk top is under required level for study etc.
In other words, with a desk light, your desktop illuminance is enough for study etc.
Please check the illuminance with your iPhone by using our simulation.
In conclusion, utilizing a desk light is effective in terms of saving electricity consumption.
If you want to use air conditioners effectively, you should control other heat such as;
1.Close the curtain or shutter.
You can use air conditioner effectively by reducing the heat from outside.
During summer, the place in the room where gets sunlight is 2 degrees hotter than one where does not.
You should close curtain or shutter to keep the temperature stable.
During winter, when using the air conditioner shut off cold air from the outside as much as possible and close door so that heat does not leak to the outside.
2.Turn off your television set or personal computer display
The temperature of the display surface is 31 degrees Celsius on average.
It creates a lot of heat.
You should turn off the display at least when you leave temporarily, because a display consumes a lot of power.
3.Using a DC fan.
AC fan with a diameter of 30 cm consumes about 42 W on average.
DC fan consumes about 11 W on average.
If you use AC fan to circulate the air, you consume a lot of electricity.
Using a DC fan is more efficient because there will not be such consumption of electricity.
And during summer, you can also cool your skin by the fan air.
Temperature of the skin surface where you can feel the fan air is about 3 degrees cooler.
4.Internal clean operation MODE
Internal clean operation MODE generates a lot of heat, and need more electricity than usual.
You should use internal clean operation MODE only when you make absence of the room for a long time.
1.TV set
It sure is better to turn off frequently.
2.Desktop Personal Computer
When you do not need to use it, you should turn it off.
3.Hot Carpet
When you do not need to use it, you should turn it off.
4.AC Fan
You should use a DC fan instead.
