1. cooling capacity: the output power of air conditioner must be selected according to the room size to ensure the effect. The manufacturer's requirement is an average of 200 watts per square meter. For example, a room with a square meter of 18 needs 3600 watts of cooling capacity. You can buy a standard 3500-watt machine in the market, which is called 1.5 machine for short. There are two figures in the model of the air conditioner, such as KFR35GW/***, which means that the cooling capacity of the air conditioner is 3500 watts. Horsepower is the input unit of power, and its simple conversion formula with output power is 1 horsepower =2500 watts of refrigeration capacity. The choice of refrigeration capacity is the main performance choice of air conditioning. The greater the cooling capacity, the better the effect, the smaller the cooling capacity and the lower the purchase cost, but the effect is poor and the power consumption is high. The refrigeration capacity of less than 2 horses is basically hung up, and the refrigeration capacity of more than 2 horses is basically a cabinet machine.
2. Energy efficiency ratio grade: the energy saving of air conditioner depends on the last number marked on the machine model. Energy efficiency ratio = refrigerating capacity/input power. For machines with the same refrigeration capacity, the old standard energy efficiency ratio before June this year was 1-5, which was 3.4 3.2 3.0 2.8 2.6, and the new standard after June was 1-3, which was 3.63.42. For example, the cooling capacity of 1.5 sets is 3500 watts, the power consumption of 1 energy efficiency sets is 3500/3.6=976 watts, and the power consumption of level 3 sets is 3500/3.2= 1094 watts. It can be seen that the power consumption of 1 sets is 6544 less than that of level 5 sets. 1 Energy-efficient machines are the most energy-efficient, but they are also the most expensive. From the perspective of cost performance, it is usually more appropriate to buy a level 2 machine. The above is the energy efficiency ratio of the constant speed machine, and the energy efficiency ratio of the frequency converter is 1-5, which are 5 /3.0, 4 /3.4, 3 /3.9, 2 /4.5, 1 /5.2 respectively, so it is more appropriate to buy a two-level cost performance.
3. Variable frequency machine and constant speed machine: The working principle of variable frequency machine, the compressor always starts without stopping, and outputs different sizes of cold/heat through different rotating speeds. The constant speed machine continuously outputs cold/heat, and the temperature is controlled by starting and stopping the compressor. Therefore, the biggest feature of the inverter is silence, and there is no mechanical noise when the compressor starts and stops. Secondly, the temperature control can be accurate to 0.5 degrees, while the control range of the constant speed machine is 2 degrees, so the frequency converter is especially suitable for bedroom use. Because the frequency converter is expensive, whether to choose another room depends on the economic conditions. As for energy saving of frequency converter, the working mode of frequency converter is different from that of constant speed generator, so it cannot be absolutely compared with energy saving. It takes a long time for frequency converter to realize energy saving, so energy saving is only one of the reference factors in choosing frequency converter, not the most important factor. The inverter with low energy efficiency ratio is not as energy-saving as the high-grade constant speed machine.
4. Cooling/heating function: General air conditioners are used for cooling and heating, and the models are KFR and KFRD. If you don't need heating in winter, you can spend money to buy a water cooler, the model is KF-***, which is much cheaper.
5. Electric auxiliary heating: At present, all household air conditioners on the market are heat pump type. This air conditioner cools in heating mode. When the ambient temperature is lower than 5 degrees, the temperature of the external heat exchanger is frozen below zero, so it is necessary to stop the machine frequently for defrosting and cannot heat normally. Therefore, air conditioning is not suitable for heating in northern winter. In order to make up for this deficiency, many machines have electric auxiliary heating function. In fact, electric auxiliary heating is an independent electric heating device, which automatically starts when the external machine is stopped and defrosted to maintain the heating output of the air conditioner. This function is very practical in winter.
6. Compressor brand: At present, air conditioners, compressors and other major components are socialized and large-scale manufacturing, and each manufacturer may choose the components of the same supplier. Therefore, there is no situation that the brand of compressor determines the quality of the whole machine in the past. The quality of the first-line brand is guaranteed, and the compressor brand is irrelevant and does not need special attention.
7. Brand: There are two camps. The imported joint venture products are represented by Panasonic, mitsubishi electric and Samsung, with high price, good technology and high brand grade. The professional manufacturers of China products are Gree and Haier. Midea's sales have grown rapidly in recent years. Hisense mainly makes frequency converters, and Oaks and Chigo are positioned as commercial economy. The quality and performance of China products are not bad, and the cost performance is high.
8. If the set temperature of the air conditioner is reasonable, it can save electricity. The smaller the difference between the set temperature and the ambient temperature, the shorter the starting time of the compressor and the more energy saving. The most comfortable temperature of human body in medicine is 24 degrees, so the reasonable set temperature is generally 26 degrees in summer and 22 degrees in winter.