Method And Strategy For Decoupling Control Of Radiant Cooling And Independent Fresh Air Composite Air Conditioning System

It is estimated that about 45%to 50%of the total energy consumption in the world belongs to building energy consumption.Among the total energy consumption of buildings,the consumption of air-conditioning and lighting equipment accounts for 60%to 80%.In order to reduce the energy consumption of the air-conditioning system,it is very important to optimize the control method and operation strategy of the air-conditioning equipment under the premise of satisfying the requirements of air-conditioning comfort and indoor air quality standards.After years of research by experts and scholars at home and abroad,radiation cooling and independent fresh air composite air conditioning systems have been widely recognized for their advantages in energy saving,thermal comfort,and thermal performance compared to traditional air conditioners,and they are widely used in the control of composite systems.There are also some experts conducting research,but due to the characteristics of multi-variable,strong coupling,and nonlinearity of the composite system,the research on it at home and abroad mostly stays on the theoretical value,so the system is decoupled in control design.There are great research prospects for applications.In this paper,a set of radiation cooling and independent fresh air composite air-conditioning system was designed based on the control parameters such as office temperature and CO₂ concentration.Select chilled water flow in multiple control loops of the air-conditioning system—radiation panel temperature control loop,chilled water flow—supply air temperature control loop,fresh air volume—decoupling control between CO₂ concentration control loops,and analyze them as objects.Research,proposed a decoupling control scheme based on feed-forward compensation method,and established the indoor heat balance equation through mechanism analysis and system identification,obtained the mathematical model between indoor control parameters,designed a model-free adaptive controller,and used Simulink software to establish The simulation of the control system model is performed to verify the feasibility and effectiveness of the proposed decoupling control scheme.This thesis demonstrates the strong coupling of the composite system and the necessity of decoupling by demonstrating the dynamic characteristics of uncoupled radiative cooling and independent fresh air composite air-conditioning systems;by demonstrating:?1?When the number of indoor personnel suddenly increases,?2?When the outdoor ambient temperature rises significantly?3?When the system selects other control methods,the dynamic characteristics before and after the decoupling of the composite system before and after the simulation of the dynamic characteristics of the three cases,from overshoot,adjustment time and other dynamic characteristics On the other hand,the scientificity and effectiveness of the decoupled control method used in this paper are verified,which provides a reference for decoupling control applications of radiation cooling and independent fresh air composite air-conditioning systems in practical projects.