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 daily life, we rarely think about these issues, which is what professionals need to understand. So this article makes a specific answer to these two questions.
1. What does the air conditioning energy efficiency ratio mean
Energy efficiency of air conditioners is usually a substitute for the energy efficiency ratio (EER) of household air conditioners. It is the ratio of rated cooling capacity to 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, in terms of the air-conditioning usage habits in most regions of China, air-conditioning heating is only an auxiliary means of heating in winter, and its main function is still summer cooling. 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 delineating energy efficiency grades.
1. Definition of air conditioning energy efficiency ratio
Energy efficiency ratio can also be called energy consumption ratio, which refers to how many kilowatts of cooling / heat generated by one kilowatt of electric energy for an air conditioner. This is a comprehensive indicator that reflects the cooling capacity converted into air per unit of input power during the operation of the air conditioner. The greater the energy efficiency ratio of the air conditioner, the more energy is saved when the cooling capacity is equal, and the higher the energy efficiency ratio of the air conditioner, the more power is saved.
Energy efficiency rating is a grading method that indicates the energy efficiency of air conditioning products. The air conditioners currently on the market use the new energy efficiency national standard. Among them, the level 1 energy efficiency rating air conditioner z * saves energy, the level 2 energy efficiency rating air conditioner is followed by the level 3 energy efficiency rating. The energy saving of the air conditioner is relatively low, and the fixed speed air conditioners of grades 4 and 5 are high-energy consumption products that have been eliminated.
2. Central air conditioning energy efficiency ratio
As major manufacturers invest heavily in research and development of central air conditioners, the energy efficiency ratio of central air conditioners has exceeded the level of common air conditioners such as cabinet and split systems. At the same air-conditioning temperature, the power consumption of the home central air-conditioning is lower than that of ordinary cabinet and split air-conditioning. The energy efficiency ratio of the general household split air conditioner is about 2.3 ~ 2.8, while the central air conditioner can reach more than 3.0.
Take Midea's central air conditioner as an example. This series uses Midea's full DC inverter compressor. The comprehensive cooling index z * can reach 4.75, which exceeds the national first-level energy-saving standard and the system operates efficiently and energy-saving. In addition, the central air conditioner can also be used with a wall-hung boiler, and can also use the ground source heat pump technology to increase the energy efficiency ratio to more than 5, and the energy saving effect is significant.
Second, how to calculate the energy efficiency ratio of air conditioning
The formula for calculating the energy efficiency ratio of an air conditioner is: the energy efficiency ratio of the air conditioner = cooling capacity ÷ cooling power. The cooling capacity refers to the ability of the air conditioner to adjust the room temperature. The cooling power is the power consumption of the air conditioner. , Cooling power of 2000 watts, energy efficiency ratio: 5000 ÷ 2000 = 2.50; another two-air conditioner with the same cooling capacity of 5000 watts, cooling power of 1500 watts, energy efficiency ratio: 5000 ÷ 1500 = 3.33.
The value of the energy efficiency ratio reflects the amount of cooling capacity for every 1000W of electric power consumed by the air conditioner. The size of this value reflects the energy saving of different air conditioning products. The greater the value of the energy efficiency ratio, the smaller the electric power consumed by the product when it is used, and the less power is consumed by the air-conditioning product per unit time.
Is the higher the air-conditioning energy efficiency ratio, the better?
The newly issued energy efficiency standards for air conditioners in the country are divided into five levels. The energy consumption ratio is the ratio of cooling capacity divided by the output power. The z * low standard is level 2.6. According to the new regulations, the energy consumption ratio is lower than 2.6 is the unqualified product.
The higher the energy consumption ratio, the more energy-efficient the air conditioner, but the higher the price. The utilization rate of air conditioners is not very high every year, and it is not necessarily economical to spend a lot of money to buy an air conditioner with high energy consumption ratio. It is necessary to consider comprehensively, such as buying a second-level or third-level energy consumption.
How to divide the energy efficiency ratio grade of inverter air conditioner?
Inverter air conditioner and fixed speed air conditioner 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 levels: 3.4, 3.2, 3.0, 2.8, and 2.6. The energy efficiency of the inverter air conditioner The score is also divided into 5 levels, namely 5.2, 4.5, 3.9, 3.4, and 3.0, of which the energy efficiency of inverter air conditioner 5 is equivalent to the 3 level of fixed speed air conditioner.
Fixed speed air conditioner: It is a common air conditioner with fixed speed and frequency in the market, and the cooling and heating capacity is also fixed.
Inverter air conditioner: its frequency can be converted, the speed of the compressor can be changed, the advantages of inverter air conditioner can be summarized into three points:
1. Quick cooling and heating, when starting, it runs at a high power of z * to quickly cool and heat
2. High efficiency and energy saving, the power is determined according to how much is needed, and because the compressor has almost no repeated start / stop, it does not consume excess power, and the electricity cost is only about 2/3 of the general air conditioner
3. Constant temperature control, which can control the speed of the compressor, freely change the power level, and maintain comfort.
Air conditioner z * is better to choose single cooling, the performance is higher, but it is not convenient to use, so it is still necessary to choose according to your needs.
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