Background: With the rapid growth of population, energy issues have become increasingly prominent. Refrigeration and air conditioning are a major consumer of energy, which places severe requirements on the refrigeration and air conditioning industry: reduce energy consumption, improve energy efficiency, comfort and reliability. The refrigeration device consists of four major components: compressor, condenser, evaporator, and throttle mechanism. With the development of the refrigeration and air-conditioning industry, modern technologies have been widely used: compressors and their frequency conversion technology, efficient heat transfer technology, etc. However, the throttle mechanism, one of the four major components, did not change much until the emergence of a new throttle technology, electronic expansion valve technology. Compared with traditional refrigeration systems using thermal expansion valves, refrigeration systems using electronic expansion valves have advantages in control performance and characteristics.

Introduction to the results: The throttling device in the existing refrigeration and air-conditioning system-the thermal expansion valve is independent of the original refrigeration and air-conditioning control system and acts on the system alone. It is only a passive and mechanical response to the original control system, and has shortcomings such as small adjustment range, low precision and large lag. It has become a bottleneck for the full energy-saving and optimal operation of refrigeration and air-conditioning systems. Electronic expansion valve technology is a relatively advanced technology that replaces thermal expansion valves in refrigeration and air conditioning systems. Its technical core is the electronic expansion valve control device.

Outlook: The emergence of electronic expansion valves will cause revolutionary changes in refrigeration control systems, and its advantages will surely make it replace thermal expansion valves. The introduction of electronic expansion valves has provided conditions for various energy-saving and optimized operations of the refrigeration system. The refrigeration system has achieved true overall control, and the degree of mechatronics of the refrigeration system will be greatly improved.