Simulation Analysis of Dynamic Characteristics of Urban Central Cooling System

Abstract

Users' cooling needs also change as the outdoor climate continues to change. In order to ensure the cooling demand and timely grasp the cooling capacity transmission situation and the dynamic characteristics of the heating system of the cooling pipeline network, a simulation model was built to analyze the time delay of the cooling capacity transmission and the influence of the chilled water supply flow rate and temperature on the cooling system. The results show that the chilled water supply temperature has almost nothing to do with the time delay of cold transport, and the chilled water supply flow is the main factor affecting the user's time delay, and the lower the system load, the smaller the chilled water supply flow and the longer the cold transport time. The system load decreases by 10% step, and the cooling capacity of the pipe network, cooling capacity of a chiller, power consumption of the chiller and return water temperature of the cold station gradually decrease with time. The step of chilled water supply temperature increases by 10%, and the step of chilled water supply flow decreases by 10%. The cooling capacity of the system, the cooling capacity of the cooler, the power consumption of the cooler and the return water temperature of the cold station gradually increase with time. Moreover, the system transition time is longer when the chilled water temperature and water supply flow are disturbed simultaneously.