Research On Environmental Thermal Comfort And Student Learning Efficiency Of University Libraries In Xiangtan City

Colleges and universities generally have libraries.College libraries are places for students and teachers to study and read literature.The quality of the indoor environment for self-study in the library directly affects the learning efficiency and physical and mental health of indoor personnel.Students studying in the library and residents in ordinary buildings have different requirements for the thermal environment.The design of the thermal environment parameters of the library should not only consider the demand for thermal comfort on the thermal environment,but also consider the impact of the thermal environment on the learning efficiency..The current domestic and international standards for the design of indoor thermal environment parameters for building buildings are based on the consideration of human thermal comfort.The design of indoor environmental parameters for educational buildings only considers human thermal comfort without taking other factors into consideration.Take it into consideration.Therefore,it is difficult for the current relevant standards to directly guide the design of the environmental parameters of the study rooms of university libraries.Students leave school during the high temperature period in summer.Therefore,in September and October,this article took the students in the university library of Xiangtan City as the research object.Through questionnaire surveys and field tests,the current situation of the students’ thermal comfort in the library’s natural ventilation environment was analyzed.Based on the current situation of students’ thermal comfort,a real-life experiment in the laboratory was carried out to explore the influence of thermal environment on students’ learning efficiency.Finally,through theoretical analysis,the thermal comfort prediction model of the students in the thermal environment of the university library is established,and the recommended range of library temperature parameters under different thermal comfort and learning efficiency requirements is obtained.The main conclusions obtained through on-site investigation,experimental research and theoretical analysis are:(1)Through the on-site investigation of thermal comfort in three university libraries in Xiangtan City,Hunan Province,it was found that the thermal neutral temperature of the students in the study room of the university library is 26.2°C,which is higher than the heat predicted by the PMV model.The neutral temperature is 25.1°C.The actual acceptable temperature range for 80% of students is 21.3～29.2°C,and the thermal comfort temperature range is 22.6～27.9°C.(2)The results of the human experiment in the artificial environment cabin show that when the learning efficiency is the best,the indoor operating temperature is 24.0～26.0°C.For different learning efficiency test items,the difference in the effect of temperature on it is quite different.This is due to the different brain regions used by students when completing different items.The experiment found that different learning efficiency test items all have a turning point at 25°C.It can be considered that the time for students to complete the task is shorter and the accuracy rate is higher at 25°C,so the learning efficiency is the best.By fitting the learning performance RP value and the indoor thermal sensation TSV value,the curve graph of learning performance changing with thermal sensation is obtained,and it is found that the learning performance reaches the maximum value when the thermal sensation is-0.36,that is,the learning efficiency of students in a cold environment higher.(3)Taking into account the requirements of human thermal comfort and learning efficiency for indoor temperature,the recommended range of indoor temperature under different requirements has been obtained.Among them,the recommended range of indoor temperature for high learning efficiency and thermal comfort is 24.1～25.5°C.In this temperature range,the dual-effect improvement requirements of thermal comfort and learning efficiency can be achieved.The recommended temperature range for high thermal comfort and high learning efficiency obtained in this paper is obviously smaller than other standard ranges.At the same time,compared with relevant domestic standards,the lower limit of acceptable temperature for students is higher,which is conducive to the energy saving of educational buildings in a hotter environment.