Qian Zhan Wang·2025-07-02 07:47Core Viewpoint - The article discusses the advancements and trends in China's building energy-saving technologies, focusing on the insulation of external walls, roofs, and windows, which can reduce energy consumption by over 30% and help meet national energy-saving standards [1][2]. Group 1: Building Energy-Saving Technologies - The building energy-saving technology emphasizes three main areas: external wall insulation, roof modifications, and window upgrades [1]. - External wall energy-saving modifications utilize materials like EPS (Expanded Polystyrene) boards to enhance insulation performance [2]. - Roof energy-saving improvements include the addition of concrete blocks for ventilation and the integration of green roofs to lower temperatures [2]. - Upgraded windows feature low-emissivity (Low-E) glass and double glazing to improve thermal insulation and reduce indoor energy consumption [2]. Group 2: Patent Applications and Trends - As of May 2025, China has filed 9,069 patent applications related to building energy-saving technologies, with a peak of 1,397 applications in 2023 [7]. - Leading patent applicants in the building energy-saving sector include Chengde Green Building with 143 patents, China Building with 124, and Zhuobao Technology with 121 [9]. - The most popular patent category is E04B (buildings), accounting for 24.1% of applications, followed by F24F (air conditioning and ventilation) at 9.7% [10][12]. Group 3: Airflow Management in Public Buildings - Effective airflow management is crucial for the energy-efficient operation of public buildings, focusing on indoor and outdoor air movement [4][5]. - Various ventilation modes are employed based on seasonal conditions, such as natural ventilation in transitional seasons and mechanical ventilation in winter [5]. - Airflow management strategies primarily target building airtightness and the design of HVAC systems [5].