(1) Refrigeration and air conditioning technology has become an important subject in the development of science and technology in China.
(2) Refrigeration and air conditioning technology has been widely used in various fields of national economy and people's lives.
(3) Such as large and medium-sized refrigerators, air conditioning in various civil and public buildings, commercial and household refrigerators, commercial refrigerators, etc. In order to adapt to the development and application of this special technology, many research institutes of refrigeration and air conditioning technology have recently been established.
(4) Many colleges and universities have added and strengthened refrigeration and air-conditioning specialties. At the same time, the professional team engaged in refrigeration and air conditioning technology research, design, production and operation management is also expanding.
"Refrigeration" is to use a certain method, in a certain period of time, so that an object or space to achieve a lower temperature than the surrounding environment medium, and maintain in a given temperature range. The so-called environmental medium here is the air and water in nature. In order to make a certain object or space reach or maintain a certain low temperature, it is necessary to adopt a certain method to continuously extract the heat from the object or space, and transport this heat to the external environment.
According to the development of refrigeration technology, there are two ways of refrigeration: one is to use natural cold source to refrigerate, the other is to use artificial refrigeration. At present, "artificial refrigeration" is rapidly developing and widely used.