Study And Evaluation Of Kitchen Air Quality And Control Schemes:the Software Development Of Contaminant Distribution Simulation And Optimal Selection Of Exhaust Range-hood

With the improvement of the living standard, people pay more attention to indoor air quality. Cooking in residential kitchen generates significant amount of gases and particulate pollutants, and is regarded as a major pollutant source in residential microenvironments. Removing the pollutants in the kitchen rapidly and efficiently is an important guarantee of improving indoor air quality.The conventional ventilation mode is only installing a range hood in a residential kitchen. According to the flow patterns author discovered, author presents that a natural air make-up system (a fresh air inlet under one of walls) and a full exhaust system (a louver in the ceiling for mechanical ventilation) are installed in order to improve the kitchen environment. Author presents eight different control schemes by changing the positions of the range hood, the fresh air inlet and the air outlet. The kitchen environment under the different control schemes is studied and evaluated via experiment method, numerical simulation method and Analytical Hierarchy Process.In experiment method:a great deal of experimental data was obtained and analyzed and improving kitchen environment is the overall goal. The average values of exergy and exergy intensity are adopted as evaluation indexes. Through measurement and analysis, the relatively ideal scheme is that the stove and range hood are located near the walls which were without windows and doors, a natural air make-up system (a fresh air inlet under one of walls) and a full exhaust system (a louver in the ceiling for mechanical ventilation) are installed, and location of air outlet is far from the range hood.In numerical simulation method:based on the experimental data, the distribution mathematical models of the contaminants’concentrations, the exergy, and the exergy intensity are established via Data Fit method. On the VC++platform, the established models are solved numerically. The pollutant distribution simulation software with friendly and simply operating interface is developed. The functions of the software are not only the pollutant distribution simulation, but also helping user selecting a range hood reasonably according to a specific kitchen circumstances. Because to improve kitchen environment is the overall goal, the distribution of exergy and exergy intensity are adopted as evaluation indexes. The numerical simulation analysis agrees with the experimental results.In Analytical Hierarchy Process:The sustainable development of kitchen industry is the overall goal. We built the index system of the sustainable development with indoor air quality, initial energy cost, working energy cost, and total generated pollution,4aspects. The aim is to present a relatively ideal pollutant control scheme from eight control schemes and confom to the sustainable development. The results show that the scheme which is relatively ideal for improving kitchen air quality is not the best one for sustainable development of building. The best one for sustainable development of building is that the stove and range hood are located near the walls which were without windows and doors, a natural air make-up system (a fresh air inlet under one of walls) are installed.