Why did Mercedes come out with hot air?
Why did Mercedes come out with hot air? The car was parked in the open air for one night in the cold winter, and the next day it was like an ice house. You have to start the engine before you can turn on the warm air. As soon as Mercedes gets on the bus, it can blow hot air. Let's follow me to see why Mercedes-Benz produces hot air. I hope I can help you.
Why did Mercedes come out with hot air 1?
In fact, it's not that the quality of Mercedes-Benz cars is good, nor is there any high technology on them, but that their air conditioning and heating systems work differently. Many people may not know that there are actually three ways to air-condition and heat the car. One is the waste heat hot water heating system. This heating method is the most widely used in automobiles, and is used in most family cars, small and medium-sized buses, trucks and construction machinery. Its working principle is very simple, that is, using the waste heat of the engine. When the engine is working normally, the water temperature is generally above 80℃. We introduce high-temperature coolant into the warm air tank in the carriage, so that the cold air outside the car can exchange heat through the warm air tank when entering the carriage, and then the cold air is heated and blown out by the blower. This is hot air.
This heating method is simple and reliable, with stable heat source, suitable temperature, uniform heat dissipation and no redundant energy consumption. It is a kind of waste utilization, which is very economical and practical, so it has been widely used. However, this heating method has one of the biggest disadvantages, that is, the engine water temperature rises to a certain extent before hot air can be blown. In cold winter, the engine water temperature rises slowly, and it usually takes 5~ 10 minutes to blow out hot air. Before that, all the cold air blew out, so Xiao Ming's wife was always frozen. In addition, the heating capacity of this heating method is limited, and the heating effect is very poor for buses with very large interior space.
PTC heating, the second heating method in automobiles. This way is simply electric heating for heating. There is a set of electric heating wires in the air conditioner heater. As long as the electric heating wire is electrified, it will generate heat, and then the cold air is blown on the electric heating wire by the blower, and the cold air becomes hot, and the hot air comes out from the air outlet. This heating method is extremely fast. As long as we turn on the heater switch, no matter whether the engine works or not, no matter what the engine temperature is, as long as the battery is fully charged, the heating wire will be electrified and heated, and the heater can be used. The disadvantage is that the hot air blown out is relatively dry and consumes electricity.
This heating method is usually applied to some high-end models, such as BBA. It can provide hot air before the engine water temperature rises, which greatly improves the comfort of the car. This is the principle that the Mercedes-Benz cold car next door to Lao Wang can provide hot air. At present, PTC heating in automobiles is automatically controlled. When the engine water temperature is low, use electric heating. With the increase of engine water temperature, the power of electric heating gradually decreases, and finally all of it is converted into waste heat and hot water for heating. After the engine is turned off, it will automatically switch to electric heating, so that the temperature inside the car can always be kept within a suitable range.
There are many pure electric vehicles on the market now. It has no engine, and of course there is no residual hot water. It can only be heated by electric heating, that is, PTC heating. In electric vehicles, PTC heating power is relatively large, generally exceeding 1kW, which will consume a large part of electric energy. Therefore, in the cold winter in the north, the cruising range of electric vehicles will drop sharply.
The third heating mode in automobile is independent heat source heating system. This heating system is an independent auxiliary heater attached to the car, which can be used after the engine is turned off and can also provide auxiliary heating during driving, so it is also called parking heater. Its working principle is to extract a small amount of fuel from the fuel tank into the combustion chamber of the parking heater, and then the fuel burns in the combustion chamber to generate heat, heating the engine coolant or air, and then radiating the heat to the compartment through the warm air radiator, and preheating the engine at the same time. According to different fuel types, it can be divided into gasoline and diesel, and according to different heating media, it can be divided into water heating system and air heating system. Generally, large trucks, construction machinery, etc. mostly use diesel gas heating system, while cars, SUVs, etc. mostly use gasoline water heating system.
This heating system has the advantages of large heating capacity and fast heating speed, which is not affected by engine working conditions and can realize automatic control and remote control operation. Think about it. On a cold winter morning, you remotely start the heating system upstairs and make it work to heat the car and preheat the engine. When I went downstairs, the temperature inside the car was already relatively high, and the engine temperature also rose. You can start driving immediately, which not only saves time, but also greatly improves the comfort of the car. Therefore, it has been widely used in some high-end passenger cars, such as imported Audi Q7, BMW X5, New 7 Series and Land Rover.
In addition, this independent heat source heating system is also used in some large passenger cars, recreational vehicles, trucks driving in alpine regions, construction machinery and so on. Because the residual heat of the engine is limited. In order to have a better driving experience and comfort, some people will install this system in the car. When this system works, it will consume a small amount of fuel and battery power, and at the same time it will emit a certain amount of exhaust gas. Pay attention to avoid letting these exhaust gases enter the car to prevent tail gas poisoning.
To sum up, there are three heating methods in the car: waste heat, PTC electric heating and independent heat source. Ordinary family cars generally use waste heat, so warm air can only be used after the engine water temperature rises; PTC electric heating is generally used in high-end cars or pure electric vehicles, and warm air can be used at any time, but it will consume more electricity; Independent heat source type is generally used in cold areas, which can generate large heat and can be preheated in advance. In fact, in some high-end models, these heating modes coexist. The electronic control unit will make a judgment according to the specific temperature, engine working condition, battery voltage, etc. And reasonably adjust the proportion of various heating methods to keep the temperature in the compartment within a suitable range.
Finally, let's talk about whether using warm air will increase fuel consumption. From the above analysis, it can be seen that waste heat heating is pure waste heat utilization and will not have any impact on other automobile systems, so it will not affect fuel consumption; PTC electric heating adopts battery power supply, which will not increase fuel consumption; Independent heat source heating system will consume a small amount of fuel because it needs to burn fuel to release heat, which will slightly increase the fuel consumption of the car, but the degree of increase is extremely limited. Of course, if measured by the strictest standards, in fact, these heating methods will slightly increase fuel consumption, because they all need electricity, and the electricity in the car is also converted from fuel. From this point of view, as long as electricity is used, fuel consumption will increase, and warm air is no exception.
Why is it all hot air when Mercedes-Benz comes out? Mercedes benz c Class 2 didn't turn on the air conditioner, and hot air came out of the air outlet. Is it normal?
When the car is driving, the air conditioner is not turned on, and the air conditioner outlet is blowing hot air, but this is actually a normal phenomenon; Because the air inlet of the air conditioner passes through the engine, when the engine is started, the heat will be carried to the air outlet by the air. This is the principle of automobile air conditioning heating, so if you don't turn on the air conditioner when driving, the air blown out will be very warm.
Just turn off the external circulation when you don't turn on the air conditioner to blow the heating; The air supply system of automobile air conditioner is divided into internal circulation and external circulation. The air inlet of external circulation is outside the car, and the air outside the car is sucked into the car through the fan. When there is a traffic jam, the car is full of the smell of vehicle exhaust, which is caused by external circulation. The internal circulation air inlet is in the car, which closes the communication between the car and the outside air, prevents harmful gases from entering the car in time, and can also be used for heat preservation.
It should be noted that the automatic air conditioning system cannot turn off the internal circulation in the windshield defrosting mode, nor can it turn off the external circulation when there is hot air at the air outlet. Just choose the position of the windshield defrosting outlet.