Winter is here, the heating period has arrived, we are again the first to hear many such voices: “In order to save energy, we should enhance the sealing of the room, close the windows to prevent heat dissipation.” However, the Beijing Municipal Health Department held a monitoring of the air quality of large market place supermarkets, and found that the department market place supermarkets exceed the standard for carbon monoxide, carbon dioxide, respirable particulate matter, formaldehyde, etc.. The main reason is the crowded environment caused by poor ventilation. Winter is coming, open windows or close windows, energy saving or health? This dilemma is in front of us.
The significance of energy conservation is well known. China’s total energy consumption, the proportion of construction energy consumption has risen from 10% in 1978 to 27.4% in recent years, and is still in the stage of continuous and substantial increase. Data explain that 55% of China’s construction energy consumption is heating and air conditioning energy consumption, which is an extremely significant figure. It is observed that the new air energy consumption accounts for 15% to 25% of the total annual electricity consumption in the high-rise air adjustment. In addition to the poor insulation of the wall material, in the cold winter and hot summer, the moment the heating and cooling air in the building is open, the temperature difference between indoor and outdoor temperature in the south crosses 10 ℃ in the hot day for two to three months, while the heating period in the north where the temperature difference between indoor and outdoor temperature crosses 20 ℃ is four to six months, and the temperature difference in the northeast region is even greater. This situation, open the windows a lot of ventilation, is a very luxurious thing, a lot of heat and cold will be in vain through the air exchange dissipated, now many self-financed heating home deeply feel this.
However, ventilation for human health is quite major, not just to provide fresh air only. Decoration, furniture, office equipment, etc. will emit a large number of harmful gases, poor ventilation makes it difficult to dilute and diffuse a variety of pollutants, the most useful facility to solve home pollution is ventilation. Some disease-causing microorganisms are easily transmitted through the air, forming “indoor biological pollution”. The most important thing is that the air is not well ventilated, the staff is crowded, the air is open, the environment is relatively closed, it is easy to make bacteria, viruses, molds, mites and other microorganisms multiply, causing prevalent colds, children, the elderly respiratory asthma and other diseases, “SARS” era valuable experience is “to prevent SARS. Ventilation is more useful than disinfection”. The most important thing is to have a good air circulation, which is a basic need for health.
The truth is, many people are not familiar with the close connection between ventilation and health, plus the cost and operational constraints of ventilation systems, which have led to the current situation of poor ventilation in China. Some buildings and offices in order to speculate, intentionally misrepresent the house with a new air system, really basic without a new air system; even if there is its new air volume, the difference is also very large, as usual, only reach 3% to 15%. It is such a small amount of new air due to the lack of energy acceptance effect, the property in the operation of the air conditioning system, but also often close or reduce the amount of new air to cut the great heat loss brought by the new air.
Energy saving is needed, and ventilation should not be ignored. Winter is coming, whether to open the windows seems not so simple. In fact, the energy saving of building ventilation and the health of the air in the living room are two focal points of modern healthy housing, which is a major issue related to the further improvement of the quality of the people and the sustainable growth of the country.
Ventilation includes two forms of natural ventilation and mechanical ventilation. For modern construction, rare is the large office buildings, commercial hotels and other public construction, natural ventilation is not the best choice. The key to solving the problem is: the view of ventilation to have a revolutionary change. To artificial ventilation, intelligent ventilation, you can close the windows mechanical ventilation, thus blocking the noise, but also the fresh air can be purified, the process of ventilation can also achieve the exchange of heat.
In fact, the new air system with heat exchange is not a new thing in the last two years, but from its name to the reality of the application is completely unknown to the nation, there is a reason for this. The new air unit even in the eyes of professionals is also a high noble luxury, its price is more expensive than central air conditioning, central ventilation project without high equipment support and wholehearted control, it is difficult to reach the effect, and for the construction of the refresh problem and the cost is extremely high. These expensive new air system obviously does not match the current situation in China. Now low-cost appliance-level heat exchange new fan technology and products have emerged, but look forward to further promotion from all walks of life. In general, the whole industry is still quite weak.
Construction energy saving is related to sustainable growth, reflected in social benefits, environmental benefits, and ultimately affect their own benefits. Building ventilation is a basic need for physical health, a basic indicator, and the two must be organically linked. However, the lag of the view and the lag of the industry, let us repeatedly left and right. Winter is coming again, when will we be healthy to save energy and energy to be healthy?
