Energy-Saving Measures Of Operation And Management Of Variable-Flow Water System Of Air Conditioning

The energy consumption of chilled-water pumps and chiller accounts for about 55% of the total energy consumption of central air conditioning systems, and the energy consumption of chilled-water pumps is about 15% while chiller is about 40%. So, it is quite necessary to save energy of water systems to lower the total energy consumption of the whole systems.In about 90% operating times, the air conditioning system runs at 65% load, the designed condition and part-load operating condition are different, so 1 the operating mode of pumps and chiller should be decided by the actual operating condition of part load in order to distribute the chilled water flux soundly.The problem of energy saving of water systems in the operating condition of part load is studied. The aim is to get a more reasonable control method. Using this method, the supplied flux of chilled water can meet the needed flux of the building during the operating times of part load, the on/off condition of pumps and chiller can be decided reasonably and it has the advantage of saving energy in pumps and chiller.The paper analyzes the non-lineal relations of the quantity of heat exchange and water flux of coil exchanger in part-load operating condition, the shortage of deciding the water flux in bypass pipe, the disadvantage that the operating condition of pumps and chiller can't be met with the load change of the air conditioning system in different operating condition of using pressure-difference bypassing control in primary water pump system. Using load control method in the change of the operating condition of primary water pump system can realize that the load change is small and reasonable in the on/off condition of pumps andm mchiller by comparing load control method in primary variable-flow water pump system with pressure-difference bypassing control method, back water temperature control method.