Abstract: In order to maximize energy-saving of central air-conditioning,through the simulation and analysis of central air conditioning refrigerant principle and cooling load balance in building,an energy-saving control model basedon energy requirements is built.Under this model,the cooling load reduction in percentage with the temperature rising 1 degree is studied,as well as the resettingtime interval for air conditioning in energy-saving working status.then,some actual data of an university are denosied and further calculated using linear regression method,and also a proposed control strategy for two groups of refrigerating units is provided,Finally,energy saving parameters are suggestedto guide the energy-saving of central air-conditioning.

Key words: central air conditioning, energy-saving control, variable volume, cooling load