Experimental study on the purification performance of sterilization-Trombe walls with and without fins in the heating season

Indoor bioaerosol in winter will lead to frequent respiratory diseases, influenza and other diseases, and thermal sterilization technology is an important sterilization technology. The combination of thermal sterilization technology and Trombe wall for indoor heating can realize the thermal sterilization of indoor air in winter at the same time, which is of great significance for indoor comfort and safety. However, there is still a lack of actual research reports to study this aspect, so this paper sets up the experimental platform of traditional Trombe wall system (TSTW) and finned Trombe wall system (FSTW), and studies the effect of the two systems on indoor bacteria in winter. The change of indoor bacterial concentration with time under different temperature conditions was studied, and the inactivation effect of the two systems was analyzed and compared. The results show that: in both systems, the single inactivation rate of bacteria increased with the increase of temperature. At 75 °C, the single inactivation rates of K. pneumoniae and Escherichia coli in TSTW and FSTW systems were 0.47 and 0.78, 0.71 and 0.87, respectively. For TSTW and FSTW systems, at low temperature of 45 °C, the indoor bacterial concentration of FSTW system decreases faster than that of TSTW system; however, at high temperature, because TSTW system has a larger amount of heat exchange air, the indoor bacterial concentration of TSTW system decreases faster than that of FSTW system.