Analysis Of Energy-saving Renovation And Indoor Temperature Prediction Of University Libraries

With the rapid development of the economy and the continuous improvement of people’s living standards,people need more and more energy.From the perspective of total social energy consumption,the proportion of energy consumed by buildings and related facilities is increasing.The library is a representative public building in the university,and its energy consumption problem is becoming more and more prominent,which hinders the sustainable development concept of the university building.This paper conducts a detailed investigation on the energy-saving design and energy consumption status of university libraries,analyzes the energy-saving transformation of Shaw Library in Weishui Campus of Chang’an University,and studies and analyzes the prediction and control of indoor temperature of libraries based on the electroequivalence model.The main research work of the thesis is as follows:First,the basic data parameters of the building envelope were obtained in combination with the library’s building base map,and the building model was established using Revit according to these data.According to the established model,Revit is used to import the building model data into EnergyPlus,and at the same time download the meteorological data of the area where the library is located through EnergyPlus,and according to its energy consumption,the three aspects of the building envelope,lighting system and HVAC system are mainly energy-saving transformation,and the results show that the library has great energy-saving potential.At the same time,the data obtained from energy consumption simulation will provide data support for the establishment of RC model and provide real data for subsequent room temperature prediction.Secondly,in order to study the prediction and control of indoor temperature in buildings,the electroequivalence model is used to mathematically model the building,and several common electroequivalence models are compared,and finally the 3R2C and 1R1C models are used to model the building equivalently after analysis.According to the thermoelectric analogy,the equivalent resistance-capacitance network model of the library building was established,and the state-space equation of the library building was obtained through model transformation and discrete,and the parameters in the model were obtained based on the least squares method for parameter identification,so as to obtain the complete equivalent resistance-capacitance network model of the library building.Finally,on the basis of the electroequivalence model,a prediction method for building room temperature at different time scales based on Kalman filter algorithm and model predictive control algorithm is proposed.Compared with KF filter prediction,the root mean square error of the regional temperature predicted by MPC is smaller and the prediction accuracy is higher.At the same time,according to the theoretical basis of PID control strategy,a PID room temperature control simulation platform was established in Simulink,and an MPC controller was designed for the building heating and cooling system according to the MPC control principle.The results show that under these two control strategies,the heating and cooling energy consumption of the building is reduced,but MPC has less fluctuation,less energy consumption and higher energy saving degree than PID in room temperature control,and has better application prospects in actual room temperature control.The research of this paper provides theoretical support for the energy-saving renovation of Shaw Library,and has certain reference significance for predicting and controlling the indoor temperature of buildings and reducing building energy consumption.