Research On Energy Consumption Of Large Commercial Complex In South China Based On Satisfaction Of Indoor Environment

With the increasingly severe energy situation,the problem of building energy consumption has attracted more and more attention.As an important part of public buildings,large-scale commercial complexes have always been high-density areas for energy consumption.Under the premise of high energy consumption,whether the internal comfort of commercial complex meets people’s needs is a problem worth exploring.This paper investigates the indoor environment of large-scale commercial complexes in the south,evaluates the indoor environment from both the main and objective aspects,and combines software simulation to analyze the relationship between indoor environmental design parameters and energy consumption,and provides a reference for the reasonable control of indoor environment of commercial complexes.Firstly the paper summarizes the planning features and architectural features of large-scale commercial complexes through literature review and field research,and three typical commercial complexes are identified as research objects.The indoor thermal environment,light environment and air quality of a commercial complex were investigated by means of on-site measurement and questionnaire survey.The indoor environment was evaluated and analyzed from objective parameters and subjective satisfaction.The study found that,from the analysis of objective parameters,there are low air temperature in the commercial complex,uneven temperature distribution in vertical direction and different regions,excessive illumination in retail and public areas,and high CO₂concentration in local area.On the whole,the parameters basically met the standard requirements.From the subjective satisfaction evaluation,the indoor environment is good,the overall environmental satisfaction rate reaches 92%,and the thermal environment,light environment,acoustic environment and air quality satisfaction rate are 85%,94%,79%,88%,respectively.The main factors causing dissatisfaction with the overall environment are the thermal environment,followed by the acoustic environment and air quality,and the light environment has the least impact.When the satisfaction rate of each individual environment is above 75%,the correlation coefficient between single satisfaction evaluation and overall environmental assessment has not reached 0.5,and the degree of correlation is slightly weak.The thermal comfort model was established by regression fitting,and the thermal neutral temperature in the commercial complex was 27.2°C.The temperature range of satisfaction above 75%is 24°C²7°C.When the air temperature is in the comfort range,fluctuations in relative humidity between 50%and 70%will hardly affect the thermal sensitivity of the human body and the evaluation of the thermal environment satisfaction.The relationship between indoor design parameters and energy consumption was studied through software simulation,and it was found that indoor design temperature,relative humidity,fresh air volume index,lighting power and air-conditioning season accumulative cooling load index had a linear relationship.For every 1°C increase in indoor design temperature,6%⁷%increase in relative humidity,5⁸m³/（h·p）for new air volume,and 12¹8 W/m² for lighting power,the reduction of air conditioning cooling load is the same.Considering the air conditioning energy consumption and lighting energy consumption,the indoor design temperature is increased by 1°C,which is consistent with the energy saving effect of reducing the lighting power by 2.5³.6 W/m².According to the orthogonal experiment,the influence degree of each factor on the air conditioning cooling load is as follows:indoor design temperature>fresh air volume index>indoor relative humidity>lighting power density.The cold load indicators of different functional areas were analyzed,and the energy saving potential of each area in the optimization of individual parameters was compared.Considering the indoor environment satisfaction evaluation and analysis of energy consumption of commercial complexes,it is suggested that the indoor design temperature range of the southern large commercial complex is 25°C²7°C in air-conditioning season,and the relative humidity can reach the standard upper limit of 70%.The illumination value of each functional area can be appropriately reduced according to the actual demand.