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Latest update: 21/06/2022 15:26:16

hu:mu inc.

Wooden building design using natural energy, as well as design supervision of workshops for wineries, craft beer, natural cheeses, etc.

Energy saving, indoor environment, effective use of locally produced materials, natural materials, wooden building design using natural energy such as snow and ice 
We mainly supervise design of energy-saving houses such as wineries that make natural wine, breweries that make craft beer, and natural cheese factories.

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Realizing both comfort and energy saving
- Surface temperature - 
Avoiding cold areas on walls and windows is important for both ensuring comfort and preventing condensation.

If the temperature is low on walls facing the outer wall and inside of windows, and especially surfaces that the hands and feet contact directly such as the floor, then even if the room temperature is sufficient, body heat will be stolen away.

The number one reason for surface temperature dropping is thought to be poor heat insulation of buildings, especially heat insulation of windows. Strong heat insulation reduces heat loss (the amount of heat that escapes from a building) and reduces energy used for heating, while at the same time increasing the surface temperature of walls and windows. This makes effective temperature rise, so even if the room temperature is lowered a little, it is still comfortable and saves more energy.

Improving insulation performance in this way is most effective in terms of health, comfort, and energy saving. Of course, construction costs will increase, but we recommend increasing insulation performance as much as is permissible. In the cold regions of Hokkaido and Tohoku, it is best to use high-performance glass wool with about 300 mm in the roof and about 200 mm in the outer walls. Of course, it is preferable to make insulation thicker, but is also important to make a good heating plan.
- Heating plan -
The true enemy of warmth is air flow. The key is how to warm up a room without creating air flow.

Heating plans also have a great influence on surface temperature and affect health and comfort, including the dry feeling of mucous membranes of the eyes and throat. We use radiant heating with hot water panel heaters that do not move air other than natural convection.

Even if room temperature is the same as the surface temperature of the walls, windows, and floor, the effective temperature will change greatly depending on air flow. When heating blows warm air, as with air conditioners or fan heaters, the room temperature can be raised quickly, but it generates air flow of about 0.5 meters per second. Even if wind does not hit the body directly, this air flow will lower the effective temperature by about 4˚C, despite it being a heater. If there is no airflow, users will feel comfortable at 21˚C, but if airflow is strong, users will feel cold unless they raise room temperature to about 25˚C. As the room temperature rises, the humidity drops, so even a slight breeze can damage mucous membranes exposed to airflow. Therefore, heating equipment that generates airflow has many contradictions in terms of energy saving and the living environment.

However, radiant heating with a hot water panel heater gently warms floors, walls, and windows with hot water at a temperature of 60˚C or lower. It does not move the air directly, so it is not best suited for raising the room temperature suddenly, but it is an ideal heater that can raise the effective temperature.

For more comfort and energy saving, we plan the size and placement of hot water panel heaters according to insulation performance, floor plan, and window location. We place it under large windows where heat can easily escape, near entrances, and around plumbing, such as bathrooms that require dehydration. This is an image of raising effective temperature rather than raising room temperature. If heat insulation performance is high, we can make panel heaters smaller and thinner, and simplify heating circuits, so that construction cost can be reduced.
- Ventilation Plan -
Thoroughly eliminating stagnation is more important than ventilation

Ventilation plans are necessary to live healthy and comfortably in both the hot summers and the cold winter. When it comes to ventilation planning, you may have an image of considering what kind of 24-hour ventilation system to install but that’s not the usual case. Even without a ventilation system, so long as the windows are arranged well and residents of a building can open and close windows according to the season and weather, this also offers good ventilation. It is not a matter of whether or not to use expensive and multifunctional ventilation equipment.

Increasing ventilation volume in winter will dissipate heat outside even if insulation performance is improved. Therefore, if you use a heat exchange ventilation system, you can use the heat of the exhaust to warm up the supply air, which can significantly reduce heat loss due to ventilation. However, air supply pipes are used and there is also heat exchange parts, so there is a high possibility that the air in the room will be contaminated if cleaning and maintenance are not done frequently. It also consumes more power than a normal ventilation fan. The primary purpose of a ventilation plan is “healthy and comfortable living environment,” not energy efficiency.

As a result of working on ventilation plans from a different perspective, we have found that by reducing air stagnation, it is possible to maintain a healthy and comfortable indoor environment even with a small ventilation volume. At the same time, it is possible to reduce equipment costs, power consumption, and even heat loss.

Even with the same amount of ventilation in a same building, a good ventilation plan can drastically change the indoor environment. The most important part of ventilation plans is to eliminate air stagnation. As a result, it is possible to reduce ventilation volume in winter, decreasing heat wasted, saving energy, and preventing excess dehydration. Of course, squeezing too much will deteriorate the air environment, so balance is important.

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子どもと作ろう種から育てる未来の森.pdf

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