我国建筑环境面临两方面挑战：1)建筑能耗约占我国总商品能耗的1/4，建筑节能减排意义重大；2)建筑环境空气污染问题严峻，危害民众健康。如何在保障室内空气环境健康、舒适的前提下尽量节约建筑能耗成为了室内空气质量控制领域的重要任务。现有室内空气质量控制理论和方法存在以下不足：1)未根据大气污染状况进行地域分区，难以认知不同地区建筑环境对大气污染防控要求、策略和技术手段中的不同共性特征；2）缺乏空气温湿度、污染物浓度的综合控制优化方法；3）基于正问题（即以因求果-给定污染负荷、选择控制方式后确定相关设备，然后优化运行策略），采用有限案例分析，难以得到真正意义上的“最佳”控制方式和设备。为此，本项目提出反问题-变分分析法，破解现有理论和方法的上述局限，对丰富工程热物理学科中传热传质学的内涵，拓展其向建筑环境学的外延并实现学科交叉有重要学术价值，对改善我国室内空气质量和保障民众健康有重要社会意义。

Building environment faces two challenges in China: 1) building energy consumption takes about 25% of China’s total energy consumption so that it is of great significance to reduce building energy consumption and emission; 2) indoor air pollution is a serious problem in China, endangering people’s health. It becomes a critical task for sustainable development in China to reduce energy consumption while maintaining healthy and comfortable indoor environment. The existing indoor air quality control theories and methods have the following shortcomings: 1) geographical zoning with different ambient air pollution condition is not obtained so that it is difficult to recognize the common characteristics of the ambient environment pollution prevention and the control requirement, strategy and technical approach in each zone with specific ambient air pollution condition; 2) previous studies often separate indoor air quality from the integrated control of indoor air temperature, humidity and pollutants; 3) previous studies are based upon positive problem (i.e. by finding results for influencing factors or reasons – giving the pollution load, selecting the control method, determining the relevant equipment, and then optimizing the operation strategy) so that it’s difficult to get the “optimal” control strategy and equipment by using the analysis based upon a few cases. Our project proposes a new approach, inverse problem-variation method, to solve the above problems. This project will not only develop the heat and mass transfer in built environment but also improve the indoor air quality in China which is helpful to protect people’s health in China.