TY - JOUR
TI - The HVAC model predictive control of building thermal dynamic characteristics
AU - Chi Mingshu
AU - Guo Yizhuo
AU - Yu Kecheng
AU - Zhang Cong
AU - Gao Yuan
AU - Lu Junchen
JN - Thermal Science
PY - 2023
VL - 27
IS - 2
SP - 1007
EP - 1014
PT - Article
AB - As the terminal energy user of urban power grid, it is significant to model  and simulate the energy consumption characteristics of buildings. First, the  author proposes a thermal dynamic model to predict the energy consumption of  building refrigeration/heating, it is composed of several groups of heat  transient energy balance equations, which can fully consider the impact of  heat convection, heat conduction and heat storage on building energy  consumption during the heat transfer process of building envelope. Then, the  HVAC model predictive control (MPC) method considering the thermal dynamic  characteristics of the building envelope is proposed for the heating,  ventilation and air conditioning, the core energy unit of the building, the  change of window wall ratio in building will affect the thermal insulation  performance of the building, so the window wall ratio in building design  should not exceed 0.7. From the perspective of building thermal insulation  performance, the author analyzes the situation that the total 48 hours  operating cost of buildings under two control methods changes due to the  change of building thermal insulation performance with the change of window  wall ratio in different environments, the simulation results show that when  using MPC control method for HVAC, the daily operating cost of buildings  increases with the window wall ratio at a lower rate than the traditional  control method. It can be seen that the MPC control method has a better  effect of energy saving and reducing the total operating cost of buildings  in response to the environment where the window wall ratio of buildings  increases or the thermal insulation performance of buildings becomes worse  over time. It is proved that the HVAC control method based on MPC not only  helps to reduce the building energy cost, but also deals with the reduction  of HVAC energy efficiency level and the deterioration of building  insulation performance, it is more conducive to saving energy and improving  the operating economy of buildings.