Does anyone know about passive house?

"The passive house standard is different from ordinary energy-saving buildings in that it is qualified in two ways: one is the energy consumption index, and the other is the indoor

comfort index. Generally, a passive house is a house that consumes no more than

15 kilowatt-hours/square meter of primary energy for heating by making full use of renewable energy and other sources.

The concept of passive house originally came from Germany, and passive house originated in Frankfurt, Germany in 1991. The standard of passive house is different in each

local area, and specific issues need to be analyzed. Hebei Province, residential building standards have been completed, is expected to come out this year

Taiwan, which has the content of the passive house. In this standard, some requirements and China's current energy-saving standards are different,

such as the passive house, there are two aspects of the qualification: one is the energy consumption indicators, the second is the indoor comfort indicators. These are two important

important changes to change the past in China with energy saving 50%, 60%, 75% of the relative standard, passive house is used as an absolute indicator to

replace the relative standard. It is stipulated that the heat demand for heating is 15 kilowatt-hours, the cooling demand is 15 kilowatt-hours, and the total primary energy demand

is 120 kilowatt-hours, and these indicators have been adjusted in accordance with the climatic conditions of Hebei Province.

The standard differs from Germany in that this energy consumption target limit is accompanied by a very strict indoor comfort

degree target. At present, China's Yangtze River Basin building energy consumption is very low, if the Shanghai or Chongqing energy consumption indicators out

there may be lower than the German passive house indicators, but they are sacrificing indoor comfort in exchange for a low energy consumption indicators. Whereas

passive houses can reach indoor temperatures of 18 degrees Celsius or more in winter, these low-energy houses in the Yangtze River Basin can't. Passive house regulations

the indoor temperature, 8760 hours a year should be in 20 ℃ ~ 26 ℃, the relative humidity is 40% ~ 60%, the frequency of over-temperature

to be less than 10%, the indoor carbon dioxide content should be less than 1000 ppm, the temperature difference between the indoor surface of the temperature is less than 3 ℃, the noise should be less than 30 d

b, the indoor not allowed to have condensation and mold phenomenon.

The phenomenon of mold and condensation is not allowed in the room.

The standard of passive house is higher than that of ordinary energy-saving buildings, and you need to pay attention to the following problems:

First, you can't reduce the energy consumption of refrigeration because of the use of sunshade, but it leads to the improvement of lighting energy consumption. This is the south of many

many design institutes often make a mistake, because of China's energy-saving calculations are more complex, so the architects in the infrastructure is not

willing to carry out energy-saving calculations, their original set of regulations, in accordance with the coefficients specified in the operation of the sunshade to do a very low level, it is bound to

will affect the indoor lighting, and the indoor lighting is used for electricity, electricity is the High-quality energy, the final energy conversion

, will be in accordance with the base multiplied by three to calculate the energy consumption, so not only can not reduce the real energy consumption of the house, but also improve the

energy consumption of the house.

Secondly, the technology used should not lead to higher energy consumption for air conditioning in summer while reducing energy consumption for heating in winter. North

fontal area often happen, such as some claimed energy saving 75% of the building, in the summer energy consumption to be extended for a month, because

to achieve energy saving 75% when the building's external insulation must be done very thick, and can not open the window, such a building in the summer cooling energy

consumption, time, intensity are greater than ordinary buildings, to use electricity, air conditioning, total Energy is not only not reduced, but is raising

higher.

Third, the airtightness of the building needs to be strictly regulated, and develop testing methods. China's overall housing does not do airtight

requirements, but only for the windows have strict airtightness regulations, the degree of strictness is no less than the European standards. To house overall energy saving

energy, you need to the entire periphery of the system of airtightness are required, and testing.

Fourth, the installation of efficient heat recovery devices and ventilation. The current building standards, there is no mandatory requirements for fresh air

this is another important reason why many energy-saving buildings are not energy efficient. When we pursue 60%, 75% energy saving standards

, often the insulation layer will be made thicker, usually more than 6 centimeters, or even up to 10 centimeters, so that the house overall

airtightness than in the past will have a great deal of improvement. In the past, the traditional building, always rely on the natural leakage of the house to get oxygen, new

wind, more than 60% of the energy-saving standard housing, rely on this leakage has been unable to meet the normal oxygen demand, and people feel comfortable

services oxygen demand to be less than 1,000 ppm, if there is no fresh air system in the ordinary building is not up to this value, the actual

The actual house has been in a state of oxygen deficiency.

Promoting the development of passive house will bring the following impact on the real estate industry and the Ministry of goods industry:

One, it will promote the upgrading of products and related industries. Take the windows and doors industry as an example, for passive house, airtightness is the key to its low energy

consumption, and the airtightness of the close relationship between the quality of doors and windows is particularly important. China's door and window market confusion, there is

low-price competition in the market chaos, passive house on the profile of high quality requirements, which is conducive to the elimination of low-priced low-quality products,

for the production of high-quality profiles of enterprises to provide a good opportunity for development.

Two, passive house can be natural material, saving energy. For example, Heilongjiang has the richest biomass energy, which greatly reduces

lowers developers' infrastructure investment. Qingdao plans to build 500,000 square meters of passive house in three years in the whole region, this region is the world's richest place in solar energy resources

. Doing passive houses in these two regions could reduce the energy used for projects by 90%. The

Passive house project in Zhuzhou, Hunan province, along the Yangtze River, can save even more energy if it finds a technical solution to high temperature and high humidity.

Third, it can reduce greenhouse gas emissions. According to the statistics of China's northern residential buildings, every year in winter heating, to

consume 200 million tons of standard coal, according to China's 65% energy-saving standards, by 2050, the annual energy consumption of the northern residential buildings will double

. If you build a passive house, by 2050, energy consumption will only grow by 36 million tons of standard coal.