Experimental Study on the Influence of Ventilated Window on Indoor Air Quality and Energy Consumption

Abstract

The ventilated window has great potential on improving indoor air quality, but it may increase energy consumption. This paper studies the influence of different running modes of ventilated window on indoor PM2.5 and CO2 concentration and the overall energy consumption. When indoor PM2.5 concentration was more than 90ug/m3, and outdoor PM2.5 concentration was less than 300ug/m3 after ventilated window operating for an hour, indoor PM2.5 concentration decreased for 9-16%, it is appropriate to operating the ventilated window, but it was still 0.18-0.27 times more than the secondary standard. Operating the ventilated window for 55mins on mid-grade and high-grade respectively could reduce the increment of CO2 concentration for 3.31% and 22.19% than that without ventilated window operating. When the ventilated window operateing on low-grade, the increment of CO2 concentration was 11.34% larger than that without ventilated window operating. By increasing air volume and operating time of different modes, indoor air quality can be improved. Comparing with the condition with ventilated window off, the maximum energy consumption after ventilated window operating for 24hours on high-grade was 2.462 kW·h-1 (2.054 kW·h-1 for air conditioning consumption). Appropriate operating mode and running time can be chosen to reduce energy consumption effectively.