During the hot summer, all brands of air conditioners are vigorously promoting their own products, and the promotion of “one night and one power†really makes consumers feel excited. So, is the current air conditioner really capable of only one power per night? The air-conditioning testing experts of the Shanghai Electromechanical Center of the Inspection and Quarantine Bureau have a positive attitude towards this. With the continuous development of control and manufacturing technology, the air conditioner has gradually evolved from a fixed frequency type to a DC frequency conversion type with adjustable compressor speed. In daily energy efficiency testing, the inverter air conditioner is indeed more advantageous than the fixed frequency air conditioner in terms of energy saving. Start smooth and low noise The inverter air conditioner performs soft start at a lower power frequency, the starting current and starting torque are smaller, the vibration and noise are low, and the impact on the power grid and other household appliances is small; and the fixed frequency air conditioner compressor is started at the rated voltage and frequency. The starting current is large, which has a great impact on the power grid and other household appliances. At the same time, because the inverter air conditioner adopts the DC stepless speed regulation fan motor, the air supply of the air conditioner is soft and stable, and the running noise of the air conditioner is also reduced. Tempered temperature fluctuations are small After the inverter air conditioner is started, the compressor can run at the upper limit of the frequency range, and the rotation speed is more than doubled compared with the speed of the fixed frequency air conditioner. It can deliver more cold (heat) amount to the room in a shorter time, reaching a rapid drop (liter). Warm purpose. Since the cooling capacity of the fixed-frequency air conditioner is relatively constant, when the room temperature is close to the set temperature and the demand for cold (heat) is reduced, the air conditioner compressor controls the room temperature through the "on/off" mode, causing the room temperature to fluctuate greatly. The comfort is poor; while the inverter air conditioner works at a lower speed by controlling the compressor, it does not stop, the room temperature fluctuation is small, and the comfort is good. Energy saving and high efficiency First, the cooling (heat) efficiency of fixed-frequency air conditioners is fixed under certain circumstances. The efficiency of the inverter air conditioner is related to the speed of the compressor, and the efficiency is high when the compressor speed is low. Therefore, when the room temperature is close to the set temperature and the demand for cold (heat) is reduced, the compressor will operate at a lower speed and the efficiency is also high. Secondly, when the compressor is to establish a certain pressure difference on the suction and exhaust side, the air conditioner can work normally. The fixed-frequency air conditioner that controls the room temperature by the “on/off†mode consumes a large amount of electric energy to establish the pressure difference on the suction and exhaust side, and the inverter air conditioner does not stop because the compressor does not need to be re-established to absorb the pressure difference on the intake and exhaust side. Electrical energy. Third, the inverter compressor rotor uses a permanent magnet made of rare earth material, which no longer consumes electric energy and reduces power input. Nowadays, the inverter air conditioners are labeled with energy efficiency indicators of 1 to 5 levels. Levels 1 and 2 indicate that the products are energy-saving products, and the first level is the most energy-saving. As the number increases, the energy-saving effect also decreases. Good low temperature heating effect Fixed-frequency air conditioners have poor heating performance when the outdoor temperature is lower than -5 °C. Inverter air conditioners increase the circulating capacity of the compressor by increasing the speed of the compressor, thereby increasing the heat absorption capacity of the air conditioner from the outside. Therefore, the inverter air conditioner still has a good heating effect in a low temperature environment. Because the inverter air conditioner adopts advanced control technology, the manufacturing cost is higher, and the price and maintenance are also improved accordingly. Generally, each unit is more expensive than ordinary air conditioners ranging from 800 yuan to 1,000 yuan. However, considering the energy-saving and energy-saving effect of the inverter air conditioner, the one-time expenditure cost can be recovered within the service life. Inverter air conditioners have gradually replaced the fixed frequency air conditioners with their superior performance. The DC inverter technology will lead the development direction of the household air conditioner industry. (Li Min)
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