Research On The Energy Saving Control System Of Central Air-conditioning Based On Energy Efficiency Optimization

The thesis is an application research about central air-conditioning cold source system for energy saving control.In the traditional central air-conditioning control,manual operation is popular,because of its simple structure and single control mode.Because of pure manual intervention to the central air-conditioning system,it can not balance at the end of the load in real-time,causing a lot of energy waste.With the support of country’s energy saving policy and the reduction of enterprises’ demands for operating cost,introducing energy saving control in the central air-conditioning system is imperative.First of all,the thesis proposed the energy efficiency index of central air-conditioning by analyzing the impact factor about the energy efficiency,such as : partial load on energy efficiency of water system,different load on energy efficiency of refrigeration host,in and out water temperature as well as different combination of pumps’ and cooling tower’s operation mode on energy efficiency of water system.Secondly,the system concluded the critical conditions of the control parameters and corresponding control strategy according to the working features and technological requirements of the air-conditioning equipment.Then the PLC(programmable logic control)was introduced to the central air-conditioning control system,and designed the network structure,electrical schematic diagram,developed the software procedure of PLC,and it was verified by practical application.Finally,the automatic monitoring system was designed by the usage of KingView,improving the modern management level of central air-conditioning.It is not only meets the requirements of company operation but also reducing the labor input.At the same time,through the energy consumption statistics of ten months in the scene of central air-conditioning.It is concluded that monthly energy efficiency of the energy saving control system of central air-conditioning based on energy efficiency is as high as 31.63%,and monthly average energy efficiency is 24.78%.In this short time of 10 months,It is not only response to the national policy for energy saving and emissions reduction,and also cut back onspending for financial expenditure.Therefore,the energy saving control system of central air-conditioning based on energy efficiency optimization has a certain promotional value.