Research and Practice of Energy Saving Renovation Technology for Multi-zone Collaborative Network Operation of Central Air Conditioning Water System

In a modern public building, the energy consumption of central air conditioning has reached 40% to 60% of the total energy consumption of the building. In the central air conditioning system composed of multi-zone, due to the seasonal changes, temperature difference between day and night, and differences in the use environment of each zone, the operating load of equipment cannot reach the design load, forming a situation of “big horse pull a small carriage” with high energy consumption and low utilization rate. In order to reduce the energy consumption of central air conditioning, reduce carbon emissions and achieve carbon neutralization as soon as possible, the energy consumption mode of the central air conditioning water system with insufficient zone load and independent operation of each zone at the same time has been transformed into a multi-zone collaborative network operation mode. On the basis of not changing the original zone operation, the collaborative network operation function of high, medium and low zones has been increased by the opening of valves which connected the zone pipe networks. Under the condition of full load operation of each zone, it operates in different zones. When the operation is not saturated, it will be converted to the collaborative network operation mode of high zone with middle zone and low zone, or the middle zone with low zone. It realizes the fast conversion between zone operation and multi-zone network operation, so as to achieve the purpose of energy saving and consumption reduction. This article verifies the feasibility of the energy-saving renovation technology for the multi zone collaborative network operation of the central air conditioning water system through the practice of three projects, including the Gansu Telecom Second Hub Project.