Kobari
Kobari is an example of a traditional Japanese eco house.
Daylight from VELUX roof windows embraces the whole space beneath them with soft light that reaches deeper into the rooms. This enhances the beauty of the colours and shapes of the architecture and interior.
By installing roof windows, the living room is given a wide open feeling. Roof windows bring daylight and fresh air effectively into the house, allowing it to breathe and creating a healthy indoor climate.
In the summer, warm air is released through the roof windows and in winter, sunlight heats the room. An ecological life style means more hours without the air conditioner running. As hot air rises, roof windows release heat inside the house, drawing in cool air, reducing indoor temperatures considerably and making life more comfortable in summer – a process called natural ventilation.
Highly insulating window panes retain the heat of the sun. And because roof windows admit abundant daylight, façade windows can be smaller. This improves the overall insulation of the room and reduces the need for heating in the winter.
Kobari
Kobari is an example of a traditional Japanese eco house.
Daylight from VELUX roof windows embraces the whole space beneath them with soft light that reaches deeper into the rooms. This enhances the beauty of the colours and shapes of the architecture and interior.
By installing roof windows, the living room is given a wide open feeling. Roof windows bring daylight and fresh air effectively into the house, allowing it to breathe and creating a healthy indoor climate.
In the summer, warm air is released through the roof windows and in winter, sunlight heats the room. An ecological life style means more hours without the air conditioner running. As hot air rises, roof windows release heat inside the house, drawing in cool air, reducing indoor temperatures considerably and making life more comfortable in summer – a process called natural ventilation.
Highly insulating window panes retain the heat of the sun. And because roof windows admit abundant daylight, façade windows can be smaller. This improves the overall insulation of the room and reduces the need for heating in the winter.
KOBARI
Upstairs’ living room with high ceiling provides spacious feeling where light and wind surround you.
..make eco life with natural resources.
Bright and spacious upstairs’ living room
Daylight from VELUX skylight embraces the whole space with soft light and reaches deeper into rooms. Daylight enhances beauty in colors and shapes of architecture and interior.
By opening skylights without worrying about eyes of others, living room gives wide open feeling. Skylights bring daylight and wind effectively in the house and let the whole house breathe. Daylight and fresh air will assure the occupants health.
Bright and spacious upstairs’ living room
Daylight from VELUX skylight embraces the whole space with soft light and reaches deeper into rooms. Daylight enhances beauty in colors and shapes of architecture and interior.
By opening skylights without worrying about eyes of others, living room gives wide open feeling. Skylights bring daylight and wind effectively in the house and let the whole house breathe. Daylight and fresh air will assure the occupants health.
ECO
In summer, warm air would be released through skylights. In winter, sunlight would warm up the room. The ecological life style results in increasing hours without air conditioner.
Cool in summer
Ventilation & heat evacuation
Skylights let go of heat inside house since heated air moves upward to the ceiling in a house. If the heat is released from skylights, the room would be cooler in summer. With sensible wind, sensational temperature is substantially lower.
Warm in winter
Insultation and passive solar gain
High performance panels and insulated glasses will absorb and hold warmth from sunlight. Because skylights bring sufficient daylight, the size of façade windows can be smaller, which contributes to better insulation of the room. So the house would limit the use of heating in wintertime.
Cool in summer
Night cooling, effective in summer
Even in summer, outside air night time is cooler than daytime. Venting air and cooling the rooms at night, next morning would be cool and comfortable.
Utilizing the cooling effect
Indoor is cool after night cooling. Air conditioner isn’t necessary in the morning! Solar shade on skylight effectively reduces solar radiation.
VELUX skylights in Japanese Houses
Examination of natural ventilation in test house
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Ceiling height:
2.8m
All models have the same glazing area |
 |
Average ceiling height:
4.1m, 6 skylights with Awning blind
All models have the same glazing area. |
| Number |
Type of house |
|
Energy use |
|
|
|
Heating |
Cooling |
Total |
| 1 |
No skylights
No solar shading |
3,460 |
426 |
3886 |
| 2 |
No skylights
With solar shading |
3,461 |
232 |
3693 |
| 3
|
With skylights
No solar shading |
3,327 |
564 |
3891 |
| 4 |
With skylights
With solar shading |
3,327 |
202 |
3591 |
The table shows that installing skylights with awning blind only has an insignificant impact on the energy need for heating and cooling.
The calculations show that skylight model with solar shading on facade windows has the lowest energy use. In comparison with no skylight no solar shade, total energy use is 10% lower, and cooling load decrease by 50%.
Energy calculation on test houses
Floor area: 115 sqm.
Skylights: 4 VS304 on the south, 1 VS101 and 1 VS606 on the north
Bsim simulation, COP1
Weather data: Tokyo Hyakuri
Mechanical ventilation: 0.5/h
Number of occupants: 3
Infiltration: 0.06/h
Solar shading and natural ventilation above 24°C.
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