At present, non-energy-saving residential buildings in Shanghai that are not built in accordance with energy-saving standards account for more than 70% of the total residential buildings. These residential buildings generally lack energy-saving measures, have low energy efficiency levels, and have poor indoor comfort. Implementing energy-saving renovation of existing residential areas in the city can, on the one hand, improve building energy efficiency, reduce building energy demand, and effectively relieve the power supply pressure on the power grid during peak winter and summer; on the other hand, it can improve the indoor thermal comfort of the building and effectively change the residential buildings. The situation of indoor overheating in summer and cooling in winter reduces indoor noise and better benefits people's livelihood. It is a livelihood project that benefits the country and the people.
Because the load of the envelope structure in a residential building accounts for a high proportion of the total load of the building, the outer windows are the parts with the greatest energy loss in the envelope structure. Therefore, this topic focuses on the renovation of exterior windows and based on the principles of "less disturbing people, low cost, fast construction, and good quality," a set of energy-saving renovation technical system and evaluation technical system for existing residential communities that are highly applicable and easy to operate has been established. It has been applied in multiple pilot projects, which has positive guiding significance for promoting energy-saving and consumption-reduction technologies for the renovation of existing residential communities in the city.
The main innovative achievements of this topic include:
(1) Two energy-saving renovation technologies for external windows, namely, plastic-coated profiled profiles for solid web steel windows and profiled profiles for solid web steel windows and renewal of window sashes, were proposed, and were applied in pilot projects respectively. These two sash renewal technologies are the first in China. Among them, the sash renewal technology for solid-web steel window frames is included in the "Shanghai City Building Energy-Saving Window Technology Recommended Catalog (2012 Edition)" and has been vigorously promoted by the government;
(2) Based on the climate characteristics and energy consumption characteristics of Shanghai, based on investigating the current energy consumption situation of a large number of residential communities, combined with engineering practice, established a key technical system for energy conservation and consumption reduction in existing residential communities, and compiled the first domestic technical specification in the field of energy-saving renovation of existing buildings (DG/TJ08 -2010)), providing technical support and basis for energy-saving renovation of existing buildings;
(3) Invented the "On-site Testing Method for Heat Transfer Coefficient of Building Walls" and obtained the national invention patent (ZL200610028865.4), independently developed an on-site testing instrument for building heat transfer coefficient and a testing device mobile lifting heating table, and obtained 2 utility model patents (ZL200920286700.6, ZL200920286597.5), effectively overcoming the current problem that on-site testing of external wall heat transfer coefficient is limited by ambient temperature and excessive equipment volume;
(4) Established an evaluation system for energy-saving renovation of existing residential buildings, and compiled the first technical standard in the field of energy efficiency assessment of existing residential buildings,"Energy Efficiency Assessment Standard for Existing Civil Buildings (DG/TJ08 -2036)", providing technical support for existing buildings in Shanghai. Energy efficiency assessment work provides technical support.
(5) Establish a policy guarantee system for energy-saving renovation of existing residential areas, and write the "Guiding Opinions on Energy-saving Renovation of Existing Buildings in Shanghai City"(first draft) and the "Implementation Plan for Energy-saving Renovation of Existing Residential Buildings in Shanghai City"(first draft). As a programmatic document for energy-saving renovation of existing residential areas during the "12th Five-Year Plan" period of the city, it constructively proposed that "energy-saving renovation needs to be implemented simultaneously in conjunction with regular repairs of old residential areas" and "window renovation is the main focus and step-by-step implementation."
The research results of this topic have been published in Deyi Garden (The city's first energy-saving renovation project of existing residential buildings), Caobei Building (The city's first comprehensive energy-saving renovation project of existing residential building envelopes), Jinyang New Village Second Neighborhood (the city's largest energy-saving renovation project of residential buildings), and Puxing Road Street (the city's first step-by-step implementation of external windows A residential building energy-saving renovation project with a single renovation of energy-saving) have been implemented and applied in a number of representative pilot projects in existing residential communities, with a renovation area of nearly 1.5 million square meters, benefiting about 21,000 households. The project was awarded 3 patents, developed 1 energy-saving evaluation software, and prepared 7 standards. It formed 2 experimental bases (about 2500 square meters) and published 18 papers. The research results reached the international advanced level, with direct economic benefits of 6.5 million yuan.