Why is the fuel consumption of a car higher in winter than with air conditioning in summer?

Although general-purpose engine oils such as 5-W40 are now widely used, they can adapt to ambient temperatures within a wide range. However, at low temperatures, especially when the engine is just started, the low temperature will still affect the viscosity of the engine oil. As a result, the resistance of each component will increase significantly. When we adjust the air conditioner temperature knob to the red area and turn on the fan switch, under the action of the blower, the heat emitted from the heater water tank will be blown out along the air conditioner supply duct to the air outlet of the air conditioner, so that there will be warm air.

There are two reasons for good fuel consumption in winter: 1. In winter, the temperature is low, the air density is high, and the air resistance is large, because most of the energy consumed by a car is to overcome air resistance. 2. The low-temperature lubricity of the solid lubricating oil in each rotating bearing becomes worse, resulting in greater rotational resistance. The engine consumes heat energy quickly in winter, the temperature of the engine and water tank rises slowly, cold starts, idling warm-up, and low-speed driving are all the main reasons for increased fuel consumption.

The main reason is that when the temperature is low in winter, the engine needs to maintain a constant operating temperature and requires more fuel injection. In summer, when the air conditioner is not turned on, the outside temperature is very high, and the radiator sometimes cannot exchange heat with the external environment and even requires a fan to intervene to dissipate heat. It is more than 400 degrees, and it is difficult to be heated to more than 800 degrees when the subzero temperature suddenly enters the high temperature environment (the gas exchange speed is fast), which directly leads to the inability of the fuel to fully burn and reach the optimal operating temperature. These two reasons are why fuel consumption is higher in winter than in summer.

It is necessary to preheat before driving. Preheating depends on the consumption of oil. In winter, when the temperature is low, the preheating time will be longer and the amount of oil consumed will be greater. There is nothing wrong with heating the car in winter. The main thing is to ensure that all parts are fully lubricated by the engine oil. In addition, when driving at high speed, the engine body will also lose heat faster due to air intake. In addition, warm air will be used in the car, and the engine will Normally, more power is needed to ensure normal operation, and it is normal for fuel consumption to be higher.