It is the season to turn on the air conditioner to drive, but turning on the air conditioner will increase fuel consumption, and electric vehicles will also affect the mileage; From the perspective of saving car air conditioners, how high is the cost of using car air conditioners?
If you want to know how high it is, you must first understand the principle of automobile air conditioning and refrigeration.
The reason for the refrigeration of automobile air conditioners is similar to that of household air conditioners, the core is the compressor, which can drive the refrigerant to run in the pipeline after the compressor gains power; The refrigerant is cooled by a condenser, dehydrated by a drying tank, and finally turned into a liquid state at low temperature and low pressure through an expansion valve - the refrigerant mostly uses R134a (tetrafluoroethane), which has a boiling point of minus 26.5 °C and is always gaseous at room temperature. After passing through the expansion valve, it will become liquid, and the liquid refrigerant will then reach the evaporator and re-boil in the way of absorbing the heat energy of the evaporator; This process cools the evaporator while the refrigerant becomes gaseous and ready to start another cycle.
Since the refrigerant is a gaseous, liquid and then gaseous state, its internal pressure will be very high, and it also needs a strong force to drive the refrigerant to operate; Generally, it is about 5 horsepower, which is equivalent to about 3.6kW of power.
Air conditioning and fuel consumption of fuel vehicles
The air conditioner for fuel vehicles is mainly to increase fuel consumption at idling, and the idle speed of normal vehicles is mostly 800rpm, which is the concept of crankshaft turning 800 times a minute; The crankshaft of a four-stroke engine rotates twice to do work once, and each time the work is done it consumes fuel, and the higher the speed, the greater the amount of oil consumed at a time, unless it is in the same speed range of torque.
The reason why the idle speed is set at 800rpm is that the output power corresponding to the speed can meet the normal operation of the engine and will not make the engine shake. Assuming that the idle speed of 800rpm corresponds to the output of 10kW, after turning on the air conditioner, it will be compressed and consumed about 3.6kW, and the remaining 6.4kW will not ensure the smooth operation of the engine.
The car air conditioning compressor will increase the idle speed by about 300~400 rpm, which is an extra 150~200 times per minute, and the increased fuel consumption per unit time is about 0.5-1.0 liters.
The corresponding cost of use is about 4.0-8.0 yuan per hour, and whether it is acceptable is only up to oneself.
Turning on the air conditioner while driving will also affect fuel consumption, but it can also be completely unaffected! If the output of 2000 rpm is 40 kW before the air conditioner is turned on, the output at the same speed will be reduced a little. The intuitive feeling is that the corresponding speed of the same rpm will slow down, and the acceleration process will be extended, to put it bluntly, the power will be worse. If you can accept the weakened power and slightly slower speed after turning on the air conditioning, then the actual driving fuel consumption will not change; On the other hand, if you step on the accelerator according to the acceleration feeling and speed standard before the air conditioning is turned on, the fuel consumption will increase by about 1.0 liters.
（A/C是Air-conditioning空调的缩写）
Electric car air conditioning with time
The air conditioning system of electric vehicles is almost the same as that of household air conditioners, and the compressor of fuel vehicles has no power element, and the engine drives the compressor through the crankshaft; The compressor of an electric vehicle has an electric motor, which has nothing to do with the drive motor, so the power consumption of the air conditioner of the electric vehicle only needs to be calculated according to time.
Assuming that the rated power of the compressor is 5kW, then after turning on the air conditioner and adjusting it to the lowest temperature, the power consumption per hour is 5 kWh; If the AUTO mode is used and the temperature is adjusted to a relatively high standard, the average power consumption is about 2.0 kWh/h, and the vehicle with slightly less space can be as low as 1.0 kWh/h.
The cost of air conditioning for electric vehicles is very low, because the charging cost is low, the lowest electricity price of the special charging meter for new energy vehicles is a little more than 0.3 yuan per kilowatt-hour, and the public charging pile is only more than a piece;
However, air conditioning will always have an impact on the range of electric vehicles, unless the speed is also reduced.
After the fuel vehicle turns on the air conditioner, the power will be weakened, and as long as the power is adapted to the weakened, the fuel consumption will not be higher; The air conditioning compressor of an electric vehicle directly consumes the power of the power battery pack, and the drive motor also consumes the power battery pack, so it is necessary to adjust the driving habits and reduce the speed of the vehicle in order not to reduce the driving range.
Summary:
Car air conditioners will consume excess fuel or electricity, but only in the parked state will increase idle fuel consumption or electricity consumption; If the previous driving habits remain unchanged during driving, the energy consumption of the air conditioner can be balanced by adjusting the acceleration habits and cruising speed accordingly. In terms of cost of use, air conditioners for electric vehicles have advantages, and the cost of air conditioners for fuel vehicles is higher.
Finally, there is another knowledge point, that is, the refrigerant does not need to be replaced regularly, and it will not expire; The automobile air conditioning pipeline is strictly sealed, but it is not excluded that there is damage and leakage, only the leakage needs to be repaired and supplemented, on the contrary, as long as the air conditioner can be refrigerated normally, it does not need to be tested and replaced.
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