Hardware energy-saving doors and windows supporting difficult to meet the standard industry needs coordinated development

In real estate development projects, doors and windows have not always been the main part of the overall project cost, and its total amount in the entire construction project is about 2% to 5%, but from the perspective of energy conservation, the energy loss of the entire building is about 50 % is on the doors and windows, the proportion is quite large.



Hardware energy-saving doors and windows supporting difficult to meet the standard industry need to coordinate the development of energy-saving doors and windows in the market because of the mixed presence, some developers and construction companies blindly price-led, the energy-saving indicators dilute, a large number of poor quality products and non-energy-saving products into the project, leading to the construction of windows Severe leakage of air leaks and poor sealing performance. In particular, a few design departments have changed energy-saving windows into ordinary windows, resulting in energy-saving doors and windows that are not energy-efficient.

Doors and windows energy saving: the contribution of the subtlety "The house can be nothing to change, but the doors and windows must be replaced with three layers of glass." Mr. Sun had a loss at the time of the second renovation, identified only three glass The doors and windows can play a good thermal insulation effect. It is understood that many people like Mr. Sun are not rare. Most of them have realized the significance of energy conservation, but it is difficult to cope with the price or gap in the specific energy conservation issues of doors and windows. There are many energy conservation promotion and market popularization for building windows and doors in China. Work to be done.

The price is leading to disaster?

Bai Shengfang, secretary general of the China Construction Industry Association’s Building Energy Saving Professional Committee, told reporters that due to the mixed presence in the market, some developers and construction companies blindly price-led, diluting energy efficiency indicators, and entering a large number of low-quality and non-energy-saving products. As a result, serious leakage of air leaks from the building's exterior windows and poor airtightness were observed. In particular, a few design departments changed the energy-saving windows into ordinary windows, causing complaints about such doors and windows and the misunderstandings of such consumers as Mr. Sun.

Zhang Weihan, chairman of Shuanghe Doors and Windows Co., Ltd., which has the first class qualification in the contracting industry of windows and doors, told reporters that the section of plastic profiles for energy-saving doors and windows is multi-cavity (usually four-cavity or more), and the rubber strip must be EPDM. The steel lining must be configured and qualified. The prices of plastic profiles for flat window opening in this way should be 290-310 yuan per square meter. However, many construction developers and other demanders will set the price of windows and doors at 240 to 260 yuan per square meter. Some door and window factories rely on the configuration of some inferior materials to cope with the supply of low prices.

Zhang Weihan pointed out that although the domestic doors and windows enterprises do not have many well-known brands, some profile processing factories rely exclusively on the production of low-priced inferior profiles and specialize in dealing with branded profiles. This kind of roadside window and door processing workshops, in addition to sealing the balcony windows and the second-floor windows for residents to process inferior materials, also undertake the business of batch processing of some converted building projects.

The effect of energy-saving doors and windows matching the difficulty of reaching the standard cost will eventually be reflected in the energy-saving effect of building doors and windows. Bai Shengfang said that some plastic steel sliding windows and simple double glass or hollow glass, and the glass thickness and the distance between the two hollow glass is not up to the standard, simply can not meet the building energy efficiency standards. If the heat-insulating color windows and doors of aluminum alloy and the insulating glass do not meet the standards, their thermal insulation performance is difficult to meet the requirements of the index. At the same time, non-compliance products often have problems with steel linings and strips of doors and windows. The inferior rubber strips have poor resilience and are prone to deformation.

It is understood that the country has been promoting energy-saving doors and windows throughout the country since 2006, but at present, 80% of doors and windows on the market still do not meet national energy-saving standards. Although the former Ministry of Construction began to promote the energy-saving performance of building doors and windows in 2007, it has been popularized so far and the effectiveness is still not great. Industry personnel generally believe that marking is only a reference indicator, and it does not have much impact on the purchasers and design units who are familiar with the project.

The industry needs to coordinate the total amount of building doors and windows in the entire construction project is about 2% to 5%, so the energy-saving work of building windows and doors requires more cooperation with real estate developers. According to the “Construction Project Acceptance Criteria” promulgated by the former Ministry of Construction, the housing project can only be accepted after the acceptance of the building's energy conservation. Otherwise, it cannot be carried out, so that the acceptance of energy conservation has the “one-vote veto” nature.