Simplification Of Building Model And Simulation In Heating Accident Conditions

For the past few years,with the improvement of residents' living standards,people have higher and higher requirements for the temperature in heating rooms.The study of the dynamic thermal characteristics of heating buildings is conducive to improving the heating reliability of heating users and ensuring the thermal comfort of heating users.This paper analyzes the thermal characteristics of the building envelope structure,the internal heat source of the building,and the comprehensive influence of outdoor climate conditions(outdoor temperature,solar radiation,etc.)on the heating architecture,studies the dynamic heat transfer of the envelope structure,and sets up the radiator model.Based on this,a distributed parameter model reflecting the dynamic thermal characteristics of the heating building was established.Taking an energy-saving building in Changchun as a test building,a program that can simultaneously calculate the room temperature of all modules of the entire building was compiled using the distributed parameter model,simulating the dynamics of the building in accident conditions and heating conditions.The reasonable of the model was verified by comparing the actual measured temperature with the simulated temperature,in different rooms,and the conclusion was reached that the distributed parameter model can accurately reflect the change of the building temperature in the accident conditions and the heating conditions.Based on the known temperature of the building module,two methods for calculating the temperature of the whole building were explored: the area index method of the external protection structure and the thermal index method of the module room area,and the comparison of the simulation data shows that the two methods have a high degree of The consistency of the conclusion,and the simulated temperature of the building compared with the measured temperature of the module in different locations,found that there is consistency between the building temperature and the temperature of the intermediate room in the middle room.Although the distribution parameter model has high precision,the establishment of the model and the calculation of the calculation process are very tedious.To simplify the model to reduce the calculation workload,two lumped parameter models are established,namely the single-point thermal model and the multi-point thermal model(7 particles)model.Using the distributed parameter model as a reference model,through the simulation of temperature comparison between the models,the two lumped parameter thermal models were verified by simple conditions and verified by complex conditions.It was found that the multi-mass model can accurately reflect the heating conditions in accident conditions.And recover the dynamic thermal characteristics under heating conditions with high accuracy;the single-point thermal model can reflect the trend of building temperature under accident conditions but is less accurate than multi-particle thermal model,and in addition,the single-mass point The thermal model has hysteresis to the change of disturbance factors,and it can not accurately reflect the dynamic thermal characteristics of heating buildings under the combined effects of indoor and outdoor disturbances under the restoration of heating conditions.