American Willis Carrier Company designed the first air conditioning system in 1902. 1906, who applied for an American patent in the name of "air handling device". Carrier's invention originated in a printing workshop. Due to the change of air temperature and humidity, the printing machine makes the paper stretch, the oil colors are not arranged correctly, and the printed things are blurred. For this reason, Carrier has opened the door to the commercialization of air conditioners. In the next 20 years, Carrier's air conditioners were gradually used to adjust the temperature and humidity in the production process. And enter many industries, such as chemical, pharmaceutical, food, arms and other industries. In the 20 years after the invention of air conditioning, the object of enjoyment has always been machines, not people. 1922 carrier engineering co., ltd. has successfully developed a landmark product in the history of air conditioning-centrifugal air conditioner, referred to as centrifuge. The biggest feature of centrifuge is its high efficiency, which opens the door for large space air conditioning. Since then, people have become the object of air conditioning services. Air conditioning is actually popularized through cinemas. In the 1920s, the entertainment industry was depressed in summer, because no one wanted to spend money on hot money. 1925 One day, Carrier and new york Riivari Grand Theatre jointly launched the slogan "Enjoy both emotion and reason". There was a sea of people outside the Rivali Theatre that day, but almost everyone brought a paper fan just in case. However, the coolness of entering the theater gate completely conquered the audience. Since then, air conditioning has entered a stage of rapid development. The development of household air conditioners began in the mid-1920s. 1928 Carrier introduced the first generation of household air conditioners. However, due to the Great Depression and World War II, after the economic take-off, household air conditioners began to really enter the heating of thousands of households: car air conditioners: air conditioners use the heat of engine cooling water instead of resistance wires. If the glass is heated for deicing or defogging, use a resistance wire to heat it. Central air conditioning: burning oil and transporting heat through pipelines. Household air-conditioning: At present, there are two kinds of air-conditioning which are popular. One is heat pump air conditioning, which uses the principle of summer air conditioning refrigeration, that is, summer air conditioning is indoor refrigeration and outdoor refrigeration, while autumn and winter heating is contrary to summer, indoor heating and outdoor refrigeration to achieve the purpose of heating. Its advantage is high efficiency, but its disadvantage is small applicable temperature range. Generally, the temperature will stop working when it is below MINUS 5 degrees. There is also an electrically assisted heat pump air conditioner, that is, on the basis of heat pump air conditioner, an electric heating element is added to supplement the energy shortage of heat pump heating with a small amount of electric heating, which can not only effectively reduce the power consumption of electric heating alone, but also reach the temperature range compared with using heat pump alone. In recent years, with the development of air conditioning technology, the heating capacity of heating and cooling air conditioners has also made great breakthroughs. For example, Galanz heating and cooling air conditioner is specially equipped with intelligent freezing point heating system and auxiliary electric heater. In the cold winter, when the outdoor environment is in ultra-low temperature, air conditioners can create a mild and comfortable indoor environment like heaters and heaters. In order to improve the heating effect of air-conditioning heat pump, Galanz, which entered the market at a high starting point, used silicon controlled fans to accurately adjust the speed of the first batch of air conditioners, so that the air conditioners can heat stably and efficiently without auxiliary electric heating in the low temperature below zero, and at the same time, it effectively overcomes the shortcomings of general air conditioners, such as decreased heat exchange effect in the low temperature environment, freezing of indoor units, overload of compressors and so on. The outdoor unit of Galanz air conditioner also has a built-in defrosting circuit board, which allows the air conditioner to automatically remove the frost on the outdoor unit before heating, eliminating the hidden danger that the air conditioner cannot heat due to frost in winter. In addition, in view of the low temperature in winter in many areas, Galanz intelligent air conditioner has a special delayed air supply design to prevent cold air from blowing out, delaying the air supply time when the air conditioner is turned on for heating, and ensuring that the first gust of air sent out is warm air. The electric auxiliary heating external machine can be started at low temperature by heating with electric heating wire, and the minimum starting temperature is-10℃. ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? One is R 12. R 12 has a long history and is widely used, but chlorine molecules contained in the gas will destroy the ozone layer in the atmosphere and lead to the greenhouse effect. R 134a contains no chlorine molecules, its thermal performance is similar to that of R 12, and its heat exchange efficiency is better than that of R 12. Using R 134a, the basic components of automobile air conditioner have not changed much, but the price is a little higher. Compared with other alternative media, replacing R 12 with R 134a is an ideal choice at present. After the household air conditioner is electrified, the low-pressure steam of the refrigerant in the refrigeration system is sucked by the compressor, compressed into high-pressure steam, and then discharged into the condenser. At the same time, the outdoor air sucked by the axial fan flows through the condenser, taking away the heat released by the refrigerant and condensing the high-pressure refrigerant vapor into high-pressure liquid. The high-pressure liquid is injected into the evaporator after passing through the filter and throttling mechanism, and evaporates at the corresponding low pressure to absorb the surrounding heat. At the same time, the cross-flow fan makes air continuously enter the fins of the evaporator for heat exchange, and sends the cooled air after heat release to the room. In this way, the indoor air continuously circulates and flows to achieve the purpose of cooling down. The crankshaft of the fully-enclosed compressor of the central air conditioner is coaxial with the rotor of the special anti-fluorine motor and installed in the common sealed machine body. When the motor rotates, the piston in the cylinder makes reciprocating motion through the conversion of crank and connecting rod. When the piston moves to the highest point, it begins to descend. When the pressure in the piston chamber is lower than that in the suction chamber (low pressure), the suction valve plate opens. The compressed high-pressure and high-temperature gas enters the condenser through the exhaust pipe, contacts the outer surface of the radiator pipe, and condenses into a normal temperature body. The condensed heat is taken away by the cooling water in the radiator pipeline and sent to the cooling tower to spread to the atmosphere. High-pressure normal-temperature refrigerant liquid flows out from the condensation point, enters the thermal expansion valve after consideration, and absorbs a lot of heat, so the temperature of cooling water passing through the evaporator drops proudly, and the refrigerant vapor after evaporation and heat absorption is recompressed as a compressor. Through this continuous circulation, cooling water can be continuously transported to the outside.