Who costs electricity for air-conditioning heating and cooling

Who costs electricity for air-conditioning heating and cooling

Many friends who use air-conditioning know that air-conditioning heating costs more electricity than cooling, but many people do not know why air-conditioning heating costs more electricity than cooling? Why is there such a big difference in the use of the same machine?

　　 How much do you know about the working principle of air conditioning and refrigeration?

Generally, the air conditioner is composed of four major parts: compressor, condenser, expansion valve and evaporator. According to control or use needs, you can choose to install auxiliary devices such as pressure controller, temperature controller, and filter drier, but the four major parts Is essential. During operation, the gaseous refrigerant is compressed into high temperature and high pressure gas by the compressor, and then enters the condenser. The condenser is equivalent to a heat exchange device, which heats the high temperature and high pressure gaseous refrigerant into a low temperature and low pressure liquid refrigerant. The liquid refrigerant then passes through the expansion valve. The so-called expansion valve is a throttling device. Because the refrigerant flowing out of the expansion valve is contained, the pressure of the refrigerant decreases and the temperature continues to drop. At this time, the refrigerant undergoes heat exchange and gasification in the reevaporator, turning into a high-temperature and low-pressure gaseous refrigerant and returning to the compressor to continue circulating.

　　 Air conditioning heating is actually not easy!

Household air conditioners are generally air-cooled and cold-air refrigeration systems (central air-conditioning also includes water-cooled cold air, water-cooled cold water, air-cooled cold water, etc., the front refers to the heat exchange form of the condenser, and the following word refers to the heat exchange form of the evaporator), That is to say, when cooling, the refrigerant exchanges heat in the condenser, and the evaporator is blown by the fan. The evaporator has a relatively low temperature relative to the room temperature, so naturally cold air is blown out. If the air conditioner has heating function, a one-way valve and a four-way valve should be installed on the refrigerant system after the compressor is discharged. The function of the two is to change the flow direction of the refrigerant. At this time, the condenser and The functions of the evaporator are interchanged, that is, the condenser during cooling becomes an evaporator during heating, and the evaporator during cooling becomes a condenser during heating. Therefore, the fan blows the evaporator when cooling, but now it blows the condenser, so the hot air is blown out.

　　 Air-conditioning heating costs or cooling costs?

　　 After understanding the working principle of the air conditioner, we can explain the power consumption problem. Generally, the power consumption of the air conditioner refers to the power consumption of the motor that drives the compressor, because the power of the motor is constant, so in an absolute sense, the power consumption should be the same, but it is a little more complicated to actually explain this. An important parameter to measure the working capacity of an air conditioner is the COP value, which is often referred to as the energy consumption ratio. Generally speaking, it is how much cold energy and live heat I can generate when I consume 1KW of electricity. The higher the COP, the better the performance. In the design, the selection of each component is usually selected according to the cooling conditions. In the case of cooling, the heat exchange of the condenser is usually equal to the sum of the cooling capacity and the heat loss of the compressor, and the heat exchange of the evaporator is equal to the cooling of the unit In other words, the heat exchange capacity of the condenser is usually larger than that of the evaporator, so the heating capacity of the air conditioner is worse, that is to say under the rated working condition (usually the rated working condition should be selected to facilitate comparison) cooling COP The value is greater than the heating COP value. It can be seen that for the same loss of 1 kilowatt-hour of electricity, the cooling capacity is greater than the heating capacity, or conversely, when the cooling capacity and the heating capacity are the same, the heating consumes more electricity. Therefore, why is it said that heating is more power-consuming This is the reason.