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Air curtain is often used as a dynamic barrier to separate indoor and outdoor environments. This investigation evaluated the pollution-block performance of ceilingsupply air curtain system with varying air supply angles, volume flow rates, and velocities, using a validated computation fluid dynamics (CFD) model. The study found that the pollution-block performance of different air supply angles of air curtain was related with air supply velocity. The study predicted that with a constant air supply velocity, varying air supply volume flow rate had little impact on preventing outdoor pollution entering the building. For ceiling-supply air curtain, the recommended air supply velocity should be large enough to ensure the supply air to strike the floor before it is blown away by the outdoor wind at the entrance. Introduction Outdoor particulate matter (PM) pollution is severe in China that is harmful to human health. Particulates can enter building across open door and/or window and worsen indoor air quality. Air curtain is often used as a dynamic barrier to constrain heat and mass transfer between indoor and outdoor environments. Improving the pollution-block effect of air curtain is an important subject for building engineers. Significant effort has been put recently to investigate and improve air curtain performance by both experimental and simulated studies. For example, Elharriry et al. (2013) demonstrated the importance of air curtains on cold rooms by CFD. Gil-Lopez et al. (2013) analysed energy savings and hydrothermal condition improvements by means of air curtains through experiment. Goubran et al. (2016) presented an experimental study to verify and further investigate the flow characteristics of building entrances equipped with air curtains and found that experiment and simulation provided similar results. Gonçalves et al. (2012) studied the influences of different air curtain locations. However, the existing researches didn’t address the effects of different air curtain supply angles, volume flow rates, and velocities. This investigation evaluated the pollution-block performance of a ceiling-supply air curtain system at a commercial building entrance with varying air supply angles, volume flow rates, and velocities, using a validated computation fluid dynamics (CFD) model. The goal was to identify a suitable air curtain design in order to block mass and heat transfer (particularly PM2.5) from the outdoor environment. Methods CFD technique has been widely used to analyse the mass and heat transfer of air curtain. An unstructured mesh was adopted for the spatial discretization of the domain, Tests were conducted to verify the independence of the results with mesh size. The total grid number of grids is about 0.5 million. Many researches (e.g., Maxwell et al., 2016; Wang and Zhong, 2014) commonly used the standard k-ε model. This research used commercial CFD software, FLUENT (ANSYS Inc., 2011) for the numerical simulations. The software employs the SIMPLE (Patankar, 1980) algorithm to couple the pressure and velocity calculation. The study considered the solutions to be converged when the sum of the normalized residuals for all the cells satisfied the conditions (less than10 for energy and 10 for all other variables). The normalized residuals were defined as:

Comparative Study on Pollution-block Performance of Ceiling-supply Air Curtain System for Commercial Building Entrance