Experimental Study On The Effect Of Green Wall Air Supply System On Indoor Thermal Environment

Along with the accelerating pace of human civilisation,people’s quality of life is improving and their requirements for the living environment are becoming higher and higher,but the process of urbanisation has increased the convenience of people’s lives while also bringing enormous environmental pressure.Indoor pollution is more serious than outdoor pollution due to the outdoor environment and synthetic building materials,equipment and furniture.Bringing plants indoors is the most convenient and effective way to get in touch with nature and improve the indoor environment.Plants are able to regulate indoor temperature and humidity conditions through photosynthesis and transpiration,absorb indoor air pollutants and also provide a positive psychological effect.In addition,as green wall technology continues to develop,it can improve the low utilisation of traditional indoor horizontal greenery,thus increasing the purification efficiency of plants.As traditional centralised air conditioning equipment has difficulty in meeting individual needs for thermal and ventilation conditions,personalised air supply is becoming a research hotspot,and the personalised air supply of composite green wall air supply systems can improve the local environment while meeting individual needs.Based on this,the main research content and conclusions of this paper are summarised as follows:（1）Firstly,a comparative experiment was conducted to investigate the effect of the transition season greenery wall air supply system on the indoor thermal environment and CO₂ concentration by measuring the indoor environmental parameters as well as the skin temperature of the subjects and analysing the results by means of a subjective questionnaire,which showed that the transition season greenery wall was able to reduce the indoor temperature by 1.45℃,increase the relative humidity by 19.1%,reduce the CO₂ concentration by 13.83 ppm and lowered the average skin temperature by 0.18℃.In addition to this,it was able to improve the subjective evaluation of indoor comfort by the subjects.（2）Secondly,a controlled experiment was conducted to investigate the enhancement of the indoor thermal stratification phenomenon by a greenery wall air supply system under air-conditioned heating conditions in winter.The results showed that the green wall was able to increase the relative humidity by 11.89%,reduce the temperature difference between adjacent gradients by 0.5℃,and reduce the indoor CO₂ concentration by39.48ppm and the average skin temperature of the subjects by 0.27℃.In addition to this,the green wall was able to improve subjects’subjective ratings of the comfort of the air-conditioned heated room.（3）Finally,by exploring the summer greenery wall system combined with personalised air delivery,a new way of enhancing the indoor environment is proposed,which aims to meet the thermal comfort requirements of different human bodies through localised air delivery,and is able to achieve on-demand cooling and air delivery for energy saving purposes.A controlled experimental study found that the personalised desktop green wall air supply system was able to reduce the local indoor temperature in the range of 0.1-0.2℃and the humidity in the range of 0.8-5%,and improve the average skin temperature and the thermal comfort of the subjects,in addition to enhancing the subjective feelings of the subjects and increasing their satisfaction with the local environment.This paper enriches the theoretical study of indoor green wall systems by investigating the effects of green wall air supply systems on the indoor thermal environment and CO₂ concentration in different seasons,and the effects of individualised green wall air supply methods on the local thermal environment,human comfort and indoor CO₂ concentration,and provides a theoretical basis and reference for the future practical application of individualised green wall air supply systems for desktop and localised green walls.It provides a theoretical basis and a reference for future practical applications.