Popular Science｜What is the energy efficiency ratio of air conditioning

Popular Science｜What is the energy efficiency ratio of air conditioning

What does the air-conditioning energy efficiency ratio mean? How to calculate the air-conditioning energy efficiency ratio? In our daily life, we rarely think about these issues, which is what professionals want to understand. So this article will give a specific answer to these two questions.

Popular Science｜What is the energy efficiency ratio of air conditioning?

　　 1. What does the air conditioning energy efficiency ratio mean?

　　 Air-conditioning energy efficiency, usually the term for the energy efficiency ratio (EER) of household air-conditioning refrigeration, is the ratio of the rated cooling capacity to the rated power consumption. In addition, heating and cooling household air conditioners also include the concept of heating energy efficiency ratio (COP), which refers to the ratio of rated heating capacity to rated power.

However, as far as air conditioners are used in most regions in China, air conditioning heating is only an auxiliary means for heating in winter, and its main function is still cooling in summer. Therefore, what we generally call air conditioning energy efficiency usually refers to cooling energy efficiency. Compared with EER, the relevant national standards also use this as the basis for delimiting energy efficiency levels.

Popular Science｜What is the energy efficiency ratio of air conditioning?

　　1. Definition of air conditioning energy efficiency ratio

　　 Energy efficiency ratio can also be referred to as energy consumption ratio, which refers to how many kilowatts of cooling/heat an air conditioner generates with one kilowatt of electricity. This is a comprehensive index that reflects the cooling capacity converted into unit input power during the operation of the air conditioner. The greater the energy efficiency ratio of the air conditioner, the more electricity can be saved when the cooling capacity is equal, and the higher the energy efficiency ratio of the air conditioner, the more electricity will be saved.

Energy efficiency rating is a grading method to indicate the energy efficiency of air-conditioning products. Currently, the air conditioners sold on the market adopt the new energy efficiency national standard. Among them, air conditioners with energy efficiency grade 1 are the most energy-efficient, air conditioners with energy efficiency grade 2 are second, and those with energy efficiency grade 3 The energy-saving performance of air conditioners is relatively low. Fixed-speed air conditioners of class 4 and 5 are high energy-consuming products that have been eliminated.

　　2, central air conditioning energy efficiency ratio

　　 With the large investment in research and development of central air conditioners by major manufacturers, the energy efficiency ratio of central air conditioners has surpassed the level of ordinary air conditioners such as cabinet type and split type. At the same air conditioner temperature, the power consumption of household central air conditioners is lower than that of ordinary cabinet-type and split-type air conditioners. The energy efficiency ratio of general household split air conditioners is around 2.3~2.8, while central air conditioners can reach above 3.0.

　　Take Midea's central air conditioner as an example. This series adopts Midea's full DC inverter compressor with a comprehensive refrigeration performance index of up to 4.75, exceeding the national first-level energy-saving standard, and the system is highly efficient and energy-saving. In addition, the central air conditioner can also be used with a wall-hung boiler, and can also use ground source heat pump technology to increase the energy efficiency ratio to more than 5, which has a significant energy saving effect.

　　 2. How to calculate the energy efficiency ratio of air conditioning

The formula for calculating the energy efficiency ratio of the air conditioner is: the energy efficiency ratio of the air conditioner = the cooling capacity ÷ the cooling power. The cooling capacity refers to the ability of the air conditioner to adjust the room temperature, and the cooling power is the power consumption of the air conditioner, such as a 2-hp air conditioner with a cooling capacity of 5000 watts. , The cooling power is 2000 watts, the energy efficiency ratio: 5000÷2000=2.50; another two-horse air conditioner with a cooling capacity of 5000 watts, the cooling power is 1500 watts, and the energy efficiency ratio: 5000÷1500=3.33.

　　The value of the energy efficiency ratio reflects the cooling capacity of the air conditioner every time it consumes 1000W of electric power, and the value of this value reflects the energy saving of different air-conditioning products. The larger the value of the energy efficiency ratio, the smaller the electric power that the product needs to consume when using it, and the less power the air-conditioning product consumes per unit time.

Popular Science｜What is the energy efficiency ratio of air conditioning?

　　 Is the higher the energy efficiency ratio of the air conditioner, the better?

　　 The new national air conditioner energy efficiency standard is divided into five levels. The energy consumption ratio is the ratio of the cooling capacity divided by the output power. The minimum standard is level 2.6. According to the new regulations, an energy consumption ratio of less than 2.6 is a substandard product.

　　The higher the energy consumption ratio, the more energy-saving the air conditioner, but the higher the price. The utilization rate of air conditioners is not very high every year. It may not be economically cost-effective to spend a lot of money to buy an air conditioner with a higher energy consumption ratio. Take a comprehensive consideration, such as buying a second or third-level energy consumption.

　　How to classify the energy efficiency ratio of inverter air conditioners?

　　 Inverter air conditioners and fixed speed air conditioners have different energy efficiency standards. According to reports, the energy efficiency ratio is actually equal to the cooling capacity divided by the power consumption. The energy efficiency ratio of the fixed-speed air conditioner is divided into 5 levels, from 1 to 5, respectively, 3.4, 3.2, 3.0, 2.8, and 2.6. The energy efficiency of the inverter air conditioner The ratio is also divided into 5 levels, namely 5.2, 4.5, 3.9, 3.4, 3.0, of which the energy efficiency level of inverter air conditioners is equivalent to the level 3 of fixed speed air conditioners.

　　 Fixed speed air conditioner: It is a common air conditioner in the market that has a fixed speed and frequency, and the cooling and heating capacity is also fixed.

　　 Inverter air conditioner: Its frequency can be converted, and the speed of the compressor can be changed. The advantages of an inverter air conditioner can be summarized into three points:

　　1. Fast cooling and heating. When starting, it runs at the highest power for rapid cooling and heating

　　2. High efficiency and energy saving, the power is determined according to the required amount, and since the compressor hardly starts/stops repeatedly, it does not consume excess electricity, and the electricity cost is only about 2/3 of the general air conditioner

　　3. Constant temperature control, can control the speed of the compressor, freely change the level of power, maintain comfort.

　　 It’s better to choose a single-cooled air conditioner for higher efficiency, but it is not convenient to use, so you should choose according to your needs.