1. The concept, principle and difference between inverter air conditioner and fixed frequency air conditionerInverter air conditioner is based on ordinary air conditioner, which selects a special compressor for inverter, and adds a variable frequency control system. The host of the inverter air conditioner is automatically continuously variable speed, which can automatically provide the required amount of cold (heat) according to the room situation; When the indoor temperature reaches the desired value, the air withering host will operate at a constant speed that can accurately maintain this temperature, so as to achieve "non-stop operation", so as to ensure the stability of the ambient temperature. For example, when the indoor temperature is close to the set temperature, the inverter air conditioner will reduce the operating speed of the compressor and reduce energy consumption, while the fixed frequency air conditioner will start and stop frequently, resulting in lower energy efficiency. This continuous operation mode of inverter air conditioner not only reduces noise, but also reduces the wear and tear of the compressor and prolongs the service life of the equipment. 
Second, the relationship between compressor speed and refrigeration capacityIn inverter air conditioning systems, there is a direct relationship between the speed of the compressor and the cooling effect. High rotational speed means greater cooling or heating capacity, making it suitable for rapid adjustment of room temperature during initial start-up or extreme weather conditions. As the indoor temperature gradually stabilizes, the inverter air conditioner will automatically reduce the compressor speed to maintain the temperature and reduce energy consumption. This flexible adjustment mechanism allows inverter air conditioners to operate efficiently in a wide range of environmental conditions, which is not possible with fixed-frequency air conditioners. Under certain working conditions, the refrigeration capacity is proportional to the mass flow rate of the refrigerant;
q = q.m
q — Cooling capacity
q — Refrigerant refrigeration capacity per unit mass
m — Refrigerant mass flow.
Under certain working conditions, the mass flow rate of refrigerant is proportional to the speed of the compressor
m = f ( n )
f — Refrigerant mass flow as a function of compressor speed
n — compressor speed.
Combining the above two types, you can adjust the refrigeration capacity of the air conditioner by adjusting the speed of the compressor, which is the principle of DC or AC inverter air conditioner inverter energy regulation.
Motor (compressor) speed formula: n=60f(1-s) p
AC asynchronous motors all meet the above formula, and the principle of frequency conversion is to change the power supply frequency of the compressor (f); When P and S are constant, the compressor operating speed will change with the change of frequency.
The control circuit of DC inverter air conditioner is basically the same as that of AC inverter controller.
3. Comparative advantages of inverter air conditioner and fixed frequency air conditionerCompared with fixed-frequency air conditioners, inverter air conditioners have obvious advantages in many aspects. 1. Inverter air conditioners are more efficient in energy utilization. Thanks to the ability to adjust the compressor speed according to the actual demand, inverter air conditioners can significantly reduce unnecessary energy consumption. 2. Inverter air conditioning provides a more comfortable indoor environment. By continuously adjusting the compressor speed, the inverter air conditioner can keep the indoor temperature stable, avoiding the temperature fluctuations and noise caused by frequent start-stops. 3. In addition, due to the reduction of the number of starts and stops, the inverter air conditioner also has more advantages in terms of service life and maintenance costs. Finally, inverter air conditioners are also better in terms of environmental protection, as they have a lower impact on the environment due to efficient energy use, especially in terms of greenhouse gas emissions. 
Fourth, energy saving comparisonIn China, the following aspects are mainly considered in calculating the energy saving of inverter air conditioners and fixed-frequency air conditioners:Energy efficiency comparison: Inverter air conditioners typically have a higher energy efficiency ratio (EER), which means that inverter air conditioners consume less energy under the same cooling (or heating) conditions. Actual usage: Actual energy savings also need to be considered.
In China, the following aspects are mainly considered in calculating the energy saving of inverter air conditioners and fixed-frequency air conditioners:Energy efficiency comparison: Inverter air conditioners typically have a higher energy efficiency ratio (EER), which means that inverter air conditioners consume less energy under the same cooling (or heating) conditions. Actual usage: Actual energy savings also need to consider the frequency of use and continuous operation time of the air conditioner. Inverter air conditioners typically consume less energy than fixed-frequency air conditioners while maintaining a constant temperature. Temperature control flexibility: Inverter air conditioners can automatically adjust the power according to indoor and outdoor temperature changes, and this flexible temperature control is more energy-efficient. For more detailed information and specific calculation methods, you can refer to professional energy efficiency testing research and technical articles. For example, you can check out the article "Energy Efficiency Testing and Energy Saving Technology for Household Inverter Air Conditioners", which provides an in-depth analysis of energy-saving technologies for inverter air conditioners.