Home News Content

What Is Air Conditioning Energy Efficiency?

Oct 30, 2017

What is air conditioning energy efficiency?


First, what does air conditioning energy efficiency mean ?


Air conditioning energy efficiency, usually home air conditioning cooling energy efficiency ratio (EER) generation, is the rated cooling capacity and rated power ratio. In addition, the cold air-conditioning home air conditioning also includes heating energy efficiency ratio (COP) the concept, refers to the rated heating and rated power ratio.


However, the vast majority of the region's air-conditioning habits, air-conditioning heating is only an auxiliary means of winter heating, its main function is still summer cooling, so we generally call the air conditioning energy efficiency is usually refers to the cooling energy efficiency Than EER, the relevant standards of the country as a basis for delineating energy efficiency rating.


1, the definition of air conditioning energy efficiency ratio


Energy efficiency ratio can also be called energy consumption ratio, refers to an air conditioner with a kilowatt of electricity to produce the number of kilowatts of cooling / heat, which is a comprehensive indicator, reflecting the unit input power in the air conditioning operation process converted into the cooling capacity. The greater the energy efficiency ratio of the air conditioner, the more energy saved when the cooling capacity is equal, the more energy saving the air conditioning energy efficiency is.


Energy efficiency rating is a level of energy efficiency of air conditioning products, a classification method, the current market sales of air conditioning is the use of new energy efficiency GB, including a level of energy efficiency of the most energy efficient air conditioning, energy efficiency grade 2 air conditioning second, three energy efficiency level Air conditioning energy efficiency is relatively low, 4,5 level fixed speed air conditioning is already out of the high energy consumption products.


2, the central air conditioning energy efficiency ratio


With the major manufacturers in the central air conditioning investment in large research and development, central air conditioning energy efficiency than the cabinet has been more than split the level of ordinary air conditioning. At the same air conditioning temperature, household central air conditioning power consumption is lower than the ordinary cabinet, split air conditioning. General household air conditioning energy efficiency ratio is 2.3 ~ 2.8 or so, while the central air conditioning can reach 3.0 or more.


The United States to the central air-conditioning, for example, this series of US-wide DC inverter compressor, refrigeration comprehensive performance index up to 4.75, more than the national level energy efficiency standards, the system operation and energy efficient. In addition, the central air-conditioning can also be used with the boiler, you can also use the ground source heat pump technology, the energy efficiency ratio increased to 5 or more, energy-saving effect is remarkable.


Second,  how to calculate air conditioning energy efficiency ?


Air-conditioning energy efficiency ratio calculation formula, the air-conditioning energy efficiency ratio = cooling capacity ÷ cooling power, cooling capacity refers to the ability of air conditioning to adjust room temperature, cooling power is air conditioning and cooling power consumption, such as a refrigeration capacity of 5,000 watts 2 air conditioning , Cooling power of 2000 watts, energy efficiency ratio: 5000 ÷ 2000 = 2.50; another cooling capacity of the same 5000 watts of 2 air-conditioning, cooling power of 1500 watts, energy efficiency ratio: 5000 ÷ 1500 = 3.33.


Energy efficiency than the value of the size, reflecting the consumption of air-conditioning consumption of 1000W each time the size of the cooling capacity, the size of the value of different air-conditioning products reflect the energy-saving situation. The greater the energy efficiency ratio value, the smaller the electrical power required to consume the product, and the less power consumption of the air conditioning product per unit of time.


Is it better that the air conditioning energy efficiency higher?


The new air-conditioning energy efficiency standards of the country are divided into five levels. The energy consumption ratio is the ratio of the cooling capacity divided by the output power. The minimum standard is 2.6. According to the new regulations, energy consumption ratio of less than 2.6 is substandard products.


The higher the energy consumption, the more energy-efficient air conditioning, but the higher the price. The annual utilization of air conditioning is not very high, a lot of money to buy a high energy consumption than air conditioning, from the economy is not necessarily cost-effective. To consider, such as to buy a secondary or three energy consumption on it.


How is the energy efficiency ratio of the inverter air conditioner divided?


Inverter air conditioner and constant speed air conditioning energy efficiency standards are not the same. According to reports, the energy efficiency is equal to the actual cooling capacity is divided by the power consumption, fixed speed air-conditioning energy efficiency ratio is divided into five grades, from 1 to 5 were 3.4,3.2,3.0,2.8,2.6, inverter air conditioner energy efficiency Than the sub-5, respectively, 5.2,4.5,3.9,3.4,3.0, of which the energy efficiency of inverter air conditioner 5 is equivalent to the speed of air conditioning 3.


Constant speed air conditioning: the market is the common speed and frequency are fixed air conditioning, cooling and heating is fixed.


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


1. Fast cooling, heating, start, with the highest power to run, rapid cooling, heating


2. Energy efficient, according to the number of needs to determine the power, and because the compressor is almost no repeated start / stop, it does not consume excess power, the electricity is only about 2/3 of the general air conditioner


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


Air conditioning is best to choose a single cold performance to be higher, but it is not convenient to use, so that, or according to their own needs to choose.