TU-TESL

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The biggest egg of model y has been announced, which may be ignored by everyone. Tesla CEO Elon? (Elon Musk) confirmed that model y is the first Tesla car equipped with a heating pump, which is really good news, especially for people living in cold areas. Tesla Model 3 and have been using resistance heater, but model y has used heating pump for the first time. The biggest reason is efficiency. The efficiency of heating pump is three times that of resistance heater! In addition, for electric vehicles, the maximum range can be achieved by reducing or even cutting off the thermal energy. It's said that many car owners suggest putting on warmer clothes, using heated seats, and not adding warm air at the same time. This is because, when it's really cold outside, heating the cab can greatly reduce the mileage. When model y has a heating pump, this is not a problem. "I think model Y's heating pump is one of the best engineering designs for some time. The team's performance exceeded expectations. ——Elon? Musk (@ elonmusk) March 23, 2020. " Musk recently tweeted about the effectiveness of the model y heating pump and praised the team. In fact, in Tesla Model Y's owner's manual, we have found the existence of heating pump for a long time. In the "air conditioning control operation prompt" section, the introduction text is roughly the same as model 3, but the following description is added: "model y uses the heating pump to achieve the maximum efficiency; therefore, even when the outside temperature is low and the vehicle is heating or supercharging, the air conditioning compressor and the outside fan may operate and sound." Due to the snow / snow / rain (higher rolling resistance, greater friction) and cooler air (more resistance) in winter, each car loses some mileage in winter. Electric vehicles sometimes lose their range because they need electricity to heat the unit. This problem can be partially solved by pre-treatment or preheating the battery pack before departure in the morning. Tesla Model y owner's manual also contains relevant operation methods. However, if the battery pack is preheated, the electric vehicle will lose its range due to its resistance heating system. Tesla recommends using a seat heater, if you can, is more effective than using a car heater. The warm air in the car is not only a little bit cold, everyone hopes to keep it on all the time. In cold weather, doing so may result in a significant reduction in mileage, or even more than 10%. Other electric vehicles also use heating pumps, such as Renault Zoe and mini cooper se. But so far, most electric vehicles, including all other Tesla models up to now, use resistance heating, that is, the heating system completes the heating work through the heating coil, when the resistance heating element has current, it will generate heat energy, and then it will be blown out by the vent to heat the room. This is different from the heating work of the internal combustion engine vehicle, because the internal combustion engine will produce a lot of waste heat energy. These heat energy will not drive the car forward, usually the waste energy on the car, so it will not affect other. When the warm air is turned on, some waste heat energy will be used to heat the room again. In other words, running warm air in a gasoline car does not waste any extra energy. However, air conditioning is an independent system that consumes energy and reduces gas mileage. In electric vehicles, the waste heat energy is much less, so this method is not applicable, so resistance is used for heating. In other words, to generate heat, you need to consume the electricity in the battery pack. The heating system in the car consumes more energy than the gasoline car. In fact, whether it is needed or not, the internal combustion engine has been wasting the heat energy, while the electric vehicle only wastes the electric energy by heating the room. As we all know, the resistance heating system is 100% efficient, and all the electric energy lost will be converted into heat, that is, 1 unit of electric energy will be converted into 1 unit of heat energy. Now Tesla Model y has a better solution, the heating pump, which just transfers heat from one place to another, which is cheaper in terms of energy than resistance heating system. Essentially, the only energy cost here is to pump fluid from one side of the car to the other. As the fluid flows through the heat exchanger, it absorbs heat from one place and leaves it in another. Here, the air conditioning control system blows warm air into the room. This heat is usually from an air source (as opposed to the way air conditioning works), but it can also be used to generate waste heat from cars. The heating pump is next to the motor, which will be very hot when running. Tesla used to use waste heat from electric motors, but it didn't use it for indoor heating. Therefore, one unit of energy will be used to obtain three units of heat energy, which will be transferred to the room. It's not that the heat conduction efficiency exceeds 100% and violates the laws of thermodynamics, but that the use of electric energy to transfer heat energy to the place where it is needed is more efficient. In the cold climate, Tesla Model Y's endurance performance has been very good, and the emergence of the heating pump is a useful supplement. The increased endurance should be more than 2 km. For more information about Tesla Model y, please follow Sina's follow-up report.