Research On Application Of Multi-Ventilation For University Library

Ventilation is one of the effective ways to improve the indoor thermal environment.The rapid development of green buildings has made the ventilation technology attractive to many designers,but the ventilation effect is related to many factors such as the outdoor environment,ventilation volume,ventilation time and building layout.The university library is a public place that serves the entire school for teachers and students to learn and research.A reasonable ventilation strategy can reduce energy consumption in university libraries,increase resource utilization,reduce school expenses,and help build an economical campus.A university library in Hengyang was selected as object of study in this paper.To investigate the efficient utilization of multi-ventilation through the year,the effects of night mechanical ventilation,daytime natural ventilation and earth-cooled air on the indoor thermal environment was simulated for the library building.The main research contents include:(1)The influence of night mechanical ventilation on the operation performance of the air conditioning system was discussed.The optimum night mechanical ventilation conditions were obtained in combination with the analysis of energy consumption,and wall of inter surface temperature and PMV in a typical day of mouth wall were analyzed.(2)In the non-air-conditioned environment,the indoor hourly temperature and invalid hours were selected as indicators.Based on annual energy consumption simulation,the influence of daytime natural ventilation on the indoor thermal environment was compared and analyzed if there is or isn’t night mechanical ventilation.(3)Based on annual energy consumption simulation,the application effect of fresh air after tunnel cooling was analyzed,the hourly cooling capacity,supply air temperature and air supply volume of t earth-cooled air were discussed,the application effect of ground air supply cooling is studied.(4)The optimal combination mode of daytime natural ventilation,night mechanical ventilation,earth-cooled air and air conditioning system is analyzed,so as to realize the efficient utilization of energy throughout the year.