According to incomplete statistics, there are currently more than 400 manufacturers of air energy products. It's really a mixed bag. However, there are probably no more than 20 well-known brands with good product quality and good service. For example: Tsinghua Tongfang, Jinjiang Bailang, Yi Tong, Gree, Midea, Deneng, Haas, etc.: 1, Paiwo Air Energy: 20 10, the winner of the top ten brands of air energy water heaters, the world's leading air energy research and development enterprise, one of the pioneers of domestic air energy, the largest air energy producer in Shenzhen, with an air energy base of 20,000 square meters. Has a strong R&D strength and perfect after-sales service system. In 2009, the air energy industry was the fastest growing enterprise and one of the brands with the largest export volume. 2. Gree Air Energy: Winner of the Silver Award for the Top Ten Brands of 20 10 Air Energy Water Heater, the world's largest specialized air-conditioning enterprise integrating R&D, production, sales and service, and one of the top listed companies in China 100. Gree Air Energy was launched in 2007. Based on Gree's brand and product advantages, it became one of the dark horses in the air energy industry in 2009. 3. Haier Air Energy: Winner of Bronze Award for Top Ten Brands of Air Energy Water Heater 20 10, the first brand of white goods in Haier Group and the most valuable brand in China. Haier has established 29 manufacturing bases, 8 comprehensive R&D centers and 65,438+09 overseas trading companies, with more than 60,000 employees worldwide, and has developed into a large multinational enterprise group. With technical strength and loyal users, Haier air energy products achieved a turnover of 654.38 billion yuan in 2009. 4. Midea Air Energy: a large-scale comprehensive household appliance group, which is one of the largest white goods production bases and export bases in China, its air energy products came out in 2007. With the perfect network and good user reputation, it achieved remarkable results in 2009 and won the fourth place in the top ten brands of air energy water heaters in 20 10. 5.AO Smith water heater: With a history of 130 years, it has independently developed a number of patents and energy-saving technologies, ranking among the top brands of kitchen and bathroom appliances at home and abroad. Exquisite quality has won the love of many consumers and won the fifth place in the top ten brands of 20 10 air energy water heater. 6. Tsinghua Tongfang Air Energy: Tsinghua Tongfang Air Energy Heat Pump is one of the top ten air energy heat pump brands and one of the earliest enterprises in the domestic heat pump water heater industry. Committed to energy saving, heating and environmental protection, it has a complete system of technical research, product development, production, sales, after-sales service, system engineering design and implementation, and won the sixth place in the top ten brands of air energy water heaters in 20 10. 7. Yi Tong Air Energy: Guangdong Yi Tong Electric Appliance Co., Ltd. is one of the earliest enterprises specializing in the research, development, production and sales of heat pump water heaters in China, with perfect technical development capability and supporting production capacity. It has many national new practical patents, such as "high-efficiency heat pump water heater air conditioner", "water storage double-cycle high-efficiency heat exchanger" and "compensation circulation system". Yi Tong, a famous trademark in Guangzhou, is the most popular home appliance brand in Guangdong Province, a credit demonstration enterprise in Guangdong Province, a high-tech enterprise in Guangzhou, and the seventh among the top ten brands of 20 10 air energy water heaters. 8. Kangtemu Air Energy: Shandong Kangtemu New Energy Co., Ltd. was born in June 5438 +2002 10. It is an earlier enterprise specializing in the production and sales of heat pump water heaters in China, mainly engaged in the assembly of engineering machines, and won the eighth place in the top ten brands of air energy water heaters on 20 10. 9. Zheng Zheng Air Energy: Foshan Zheng Zheng Heating and Cooling Equipment Co., Ltd. is one of the earliest professional manufacturers in China to develop, research and produce heat pump water heating equipment, and also one of the largest production bases in China to manufacture heat pump water heating units. The company is committed to the development and production of first-class high-efficiency, environmental protection, safety and energy-saving heat pump water heating equipment, with the development and utilization of renewable energy and environmental protection as the development goal of the enterprise, and won the ninth place in the top ten brands of air energy water heaters in 20 10. 10, Changling air energy: Changling heat pump central water heater is a new generation of hot water equipment after gas water heater, electric water heater and solar water heater, and it is a heating water equipment that can replace boilers. It mainly absorbs heat and solar energy in the air. It combines the advantages of electric water heater and solar water heater, and is a safe, energy-saving and environmentally-friendly product. It can run all year round, and the power consumption is only one-fifth of that of electric water heaters. Its energy saving is as high as 60-75%. It has the characteristics of stable use, low failure rate and long service life, and won the tenth place among the top ten brands of air energy water heaters in 20 10. Air energy water heater, also known as heat pump water heater and air source water heater, is a "heat treatment" device that absorbs heat from the air to make hot water by using refrigeration principle. The heat in the environment is transferred to the water supply through the thermodynamic cycle process of continuous evaporation (absorbing heat in the environment) → compression → condensation (releasing heat) → throttling → re-evaporation. Four refrigeration components: evaporator, compressor, condenser and throttling device. Three parts of stabilization: liquid storage tank (compressor), expansion valve (capillary tube) and dryer (moisture) defrosting. Part one: Four-way valve breaks through the traditional energy conversion theory to achieve high energy efficiency: when the heat pump works, the working medium can absorb the energy QA stored in the environmental medium in the evaporator; But starting the system requires energy, that is, the compressor consumes QB; At the same time, the working medium releases heat QC to the high temperature medium in the condenser; After QC=QA+QB compressor input work starts the system, it changes from mechanical kinetic energy to heat energy. Therefore, the energy output by the heat pump is the sum of the work QB done by the compressor and the heat QA absorbed by the heat pump from the environment; Input a QB and get QB+QA, which breaks through the bottleneck that the traditional conversion between single and different energies cannot reach 100% efficiency; The energy efficiency ratio of heat pump technology is higher. The history of heat pump technology With the development of industrial revolution, at the beginning of the19th century, people began to be interested in whether the heat can be "pumped" from a lower temperature medium to a higher temperature medium. The British physicist J.P. Joule put forward a principle that the temperature of a compressed fluid can be changed by changing its pressure. 1854, Professor W.Thomson (Lord Kelvin) published a paper and put forward the concept of heat multiplier, which first described the idea that a heat pump absorbs low-energy heat in the air, compresses it into high-temperature gas after heat exchange in an intermediate medium, and heats water through a pipeline circulation system, and the power consumption is only 1/4 of that of an electric water heater. This new product avoids the disadvantage that solar water heaters rely on sunlight to collect heat and are inconvenient to install. Because the work of air energy water heater is to exchange heat through medium, there is no need for electric heating elements to contact with water, so there is no danger of electric water heater leakage, explosion and poisoning of gas water heater, and there is no air pollution caused by exhaust of oil water heater. Refrigerant situation At present, R22 is the heat medium used by most domestic manufacturers, and the era of using environmental protection heat medium (refrigerant) R4 17A and R4 10A has not yet arrived. And some countries such as Japan have taken the lead in adopting CO2 as the heat medium (refrigerant), which will not destroy the ozone layer (so the copper pipes must be closely connected during installation to prevent R22 leakage). In addition, R22, R4 17A, R4 10A and CO2 mentioned just now are harmless to human body, and even if they leak, the whole air energy water heater is safe. Air energy water heater VS electric water heater Air energy water heater uses refrigeration principle to heat-the national refrigeration standard requires an input of 1000 watts, and the minimum output of refrigeration is 2800 watts. According to the principle of heat balance, heating capacity = input work 1000W+ cooling capacity 2800W=3800W, and the heat generated by practical application in standard environment is 3000-4000W, while the power obtained by traditional electric water heater can never reach 1000W, so the heating effect of heat pump is 3-4 times that of traditional electric water heater. The air energy water heater is started by electricity, does not need sunlight, and occupies a small area, breaking through the strict constraints of time, space and direction. After the water stored in the solar water heater is used up, it is difficult to produce hot water immediately, especially at night without sunshine. If the electric heating time is long, as long as there is air and the temperature is between -5℃ and 43℃, the air energy water heater can be used for 24 hours. The heating time of the same power is almost 1/4 of that of an electric water heater. At the same time, it can fundamentally eliminate the potential safety hazards such as electric water heater leakage, dry burning, harmful gas generated when gas water heater is used, overcome the shortcomings of solar water heater that it can not be used in rainy days and is inconvenient to install, and has many advantages such as high safety, high energy saving, long service life and no toxic gas emission. The service life of air energy water heaters can generally reach 15 to 20 years.