Research On Integration Of Rural Prefabricated Residence Sidewall Air Supply System

With the development of social economy,farmers’ living standards have gradually improved,and people have begun to pursue a more comfortable living environment.However,rural residence has not kept up with the pace of economic development and cannot meet farmers’ needs for a comfortable life.This is mainly due to the fact that most of the rural residences in our country are mostly self-built buildings by farmers,and there is neither good structural design nor good thermal insulation measures.As a result,our country’s rural residences generally have problems such as insufficient building structure performance,poor thermal insulation performance of the envelope structure,indoor thermal comfort and air quality not meeting existing standards and so on.Moreover,indoor air conditioning methods in rural areas also rely on wall-mounted air conditioners or traditional heating measures.The advanced air conditioning methods commonly used in urban areas are not well applied in rural areas.Therefore,this research proposes a prefabricated building sidewall air supply system,which realizes the coupling of the prefabricated building and the HVAC system,and applies advanced house construction methods and passive ventilation technology to rural areas,to improve the building thermal performance and indoor thermal comfort environment of rural residences.The article elaborates on the structure and annual operation process of the prefabricated building sidewall air supply system in detail.Based on the CFD computing platform,numerical modeling research method was used.And based on the interpretation of the system architecture and operation mode,the key point of the system’s operating effect characterization which was the indoor airflow organization effect was analyzed.Taking summer operating conditions as an example,it focuses on the analysis of indoor thermal comfort conditions under different supply air temperature differences,supply air volume and air supply modes,and uses indicators such as velocity non-uniformity coefficient,air diffusion performance index,ventilation efficiency and average air age to evaluate the indoor environment under different air supply conditions,to determine the best air supply conditions.The research results show that under 1℃ air supply temperature difference,80% design air volume,and adopting the method of downward and upward air supply system,the velocity non-uniformity coefficient at 1.1m and 1.6m height planes are 0.276 and0.232 respectively,and the ADPI is 0.926,the ventilation efficiency is 1.279,the overall indoor thermal comfort and air quality are the best,and the overall indoor temperature can be kept below 25℃,which can well meet the design temperature requirements.Finally,based on the same cooling conditions,an analysis and comparison of the prefabricated building sidewall air supply system and the wall-mounted air supply system are carried out.The results show that the indoor temperature and velocity distribution uniformity advantage under the condition of using a large-area sidewall air supply system obviously,and ADPI is 0.926,the average air age of each typical indoor height plane is basically maintained at about50 s,which is also significantly lower than wall-mounted air supply,and indoor thermal comfort and air quality are better than traditional wall-mounted air conditioning in rural areas.