There is no need for heating in winter and no air conditioning in summer. The room temperature is maintained at about 20 degrees suitable for people to live all year round. The roof solar panels basically meet the needs of daily life, and the indoor air is fresh. Such an ideal house is a passive house that represents the highest level of house building technology in the world. .
Passive houses are so amazing, how did he do it?
Passive houses are designed to allow designers to fully understand the geographical environment, climate, temperature and other factors in Using natural conditions as the basis to obtain a comfortable living and working environment for humans, to minimize the energy consumption per unit of buildings, and to improve our quality of life.
1. The technical system of passive houses
The most suitable temperature for human life is about 20℃, but the world we live in has the cold in winter and the heat in summer. In order to improve our living conditions, scientists continue to study and use the latest scientific research results in the construction industry to produce The most comfortable and most insulated passive house.
1. New wall with super heat preservation
The walls of our traditional houses are mainly composed of red bricks. Red bricks have good thermal conductivity. Even in the middle of the night, the brick walls continue to radiate the heat stored during the day to the house, making the house very stuffy in summer. In winter, the heat inside the house is constantly draining outwards. If there is no fire, it is like living in an ice cellar.
Passive houses use new materials to completely change this kind of thermal bridge effect, block the heat conduction inside and outside the house, and achieve a high degree of insulation inside the house. One disadvantage of such a wall is that the wall is thick, which is more than 200mm thicker than the wall of a traditional house. As shown below:
2. New type doors and windows with super heat preservation
In addition to wall and roof systems, door and window systems also need to improve thermal insulation performance. There are two main methods. One is to use thermal bridge technology for door and window frames, and the other is to use vacuum glass and glass containing inert gas. Such doors and windows have Very good heat and sound insulation. The door is also specially designed, and even the connecting parts of the doors, windows and walls are treated with special materials to ensure a constant temperature in the house.
3. High air tightness and fresh air system (ERV: Energy Recovery Ventilation System)
Another feature of passive houses is high airtightness, because the circulating air will also bring changes in indoor temperature. But we have to keep the indoor air fresh, what should we do?
This is ERV-Energy Recovery Ventilation System. The specific technology is very complicated. Simply put, it is through a certain heat exchange method to let the fresh outdoor air flow into the room to have the same temperature as the room.
2. The high comfort of passive houses
It is precisely with high thermal insulation, high air tightness and a ventilation system with heat exchange system that passive houses can achieve the constant temperature effect of all seasons without heating or cooling, and are truly the most livable and comfortable houses.
3. The relationship between passive houses and light steel villas
Passive houses are actually the "enhanced and improved version" of light steel villas, which means that the insulation and air tightness of the light steel villa system have been improved. The wall and roof insulation layers are thickened and equipped with high insulation 3 Layered glass and fresh air system (ERV) ensure that the indoor temperature does not fluctuate with the four seasons.
4. The cost of passive houses
Passive houses have special treatments on doors and windows, walls, roofs, foundations and other aspects, plus ventilation facilities, solar panels and other auxiliary facilities, so the cost is relatively high, about 4,000 yuan/㎡.
Although the unit price of a passive house is relatively high, it is worth building from the perspective of long-term power saving and comfort. As the ad said: "One time investment, life benefit."