通常在现代建筑的耗电总量中,中央空调的耗电量要占其较大一部分的比重。因此,研究中央空调系统的相关节能改造技术,不管是对建筑的用电优化还是对社会节能来说,都有着长远而重要的意义。在本文中,笔者首先介绍了中央空调的原理以及其主要设备PLC与变频器的特性。然后通过具体的实例来说明,应用PLC与变频器,能够使中央空调在极大程度上降低能耗。希望通过本文能对我国节能减排相关研究事业有借鉴作用。 Often in the total power consumption of modern buildings, the central air conditioning power consumption to account for a larger part of the proportion. Therefore, it is of long-term and important significance to study the relevant energy-saving retrofit technologies of the central air-conditioning system, whether it is optimizing the electricity consumption of buildings or saving energy for the society. In this article, I first introduced the principle of central air conditioning and its main equipment PLC and inverter characteristics. Then through the concrete example to demonstrate, the application PLC and the frequency changer, can make the central air conditioning greatly reduce the energy consumption. Hope that through this article can have reference to China’s energy-saving emission reduction research.