Research On The Characteristics And A Superposed Model Of Internal Load Disturbances For An Office Building In Tianjin

Recently,with the improvement of thermal insulation performance of building envelope,the influence of external factors on the building loads is gradually weakened,but represented by occupant behavior the internal factors have become the most important uncertain factors that impact building loads and energy consumption.Currently,the researches of internal load disturbances were most focused on the behavioral patterns of people which can facilitate building energy efficiency,and the research results were mostly based on some building energy-consumption simulating software,and the quantitative research of load stochastic characteristics was scarce.With the support of national science foundation project ?Research on the characteristics and superposition mechanism of internal load disturbances for office buildings?(Grant No: 51308383),the study of the randomness,time-varying and spatiality of internal load disturbances was conducted.In order to study the random characteristics of building load disturbances,the concept of the internal load disturbances was defined at first,and the field test and questionnaire were conducted to investigate office buildings in summer.During the test,all relevant parameters were tested and observed,including indoor environment parameters,occupant activities and patterns,equipment power and status,performance pattern of lighting.The test data was analyzed through the statistical analysis software,the results showed that occupants and equipments were the most significant factors to influence building loads of all internal factors.The results of qualitative and quantitative analysis showed that the internal load disturbances presented typical bimodal description with time,and schedules were the important factors to influence the curve shape of building loads.Then the weight of internal load disturbances was analyzed by the method of principal component-cluster analysis,and found that the effect of normal working hours on building loads was the largest and that of lunch breaks came second.Moreover,the effect of the indoor temperature and humidity was larger at afternoon,and the indoor heat sources represented by occupants had the most prominent influence on the building loads in normal working hours.Finally,the stacking properties of interior loads in office buildings were mainly analyzed,and taking all internal effects into consideration the overlay model was set up.The measured data validation proved that the superposed model not only can reduce the design value of building loads effectively,but also reflect the random characteristics and provide targeted guiding basis for HVAC system.