Air conditioner and method for determining energy consumption of air conditioner

An air conditioner, comprising:

• a controlled device;
• a frequency converter connected to the controlled device and configured to regulate an operating frequency of the controlled device;
• and
• a controller connected to the frequency converter and configured to:
• determine a present operating frequency of the controlled device, and a present output current and a present output power of the frequency converter;
• determine a present efficiency of the frequency converter according to a preset function, the present operating frequency of the controlled device and the present output current of the frequency converter, wherein the preset function is a function of an efficiency of the frequency converter with respect to the operating frequency of the controlled device and an output current of the frequency converter;
• and
• determine a present input power of the frequency converter according to the present efficiency of the frequency converter and the present output power of the frequency converter;
• wherein the controller is further configured to:
• determine data of the output current of the frequency converter corresponding to the operating frequency of the controlled device and data of the efficiency of the frequency converter corresponding to the operating frequency of the controlled device by taking a plurality of preset frequencies as an operating frequency of the controlled device respectively;
• and
• determine the preset function according to data of the operating frequency of the controlled device, the data of the output current of the frequency converter corresponding to the operating frequency of the controlled device, and the data of the efficiency of the frequency converter corresponding to the operating frequency of the controlled device.