The idea of "using subway tunnel wind energy to generate electricity" has aroused the curiosity of many people and also attracted some doubts. “Although from the perspective of effective energy utilization, the wind energy generated in the subway system can be used for development and utilization, the wind energy generated is too small and it is difficult to achieve economies of scale, which does not have economic value in development. "Zhou Tao, a new energy industry analyst at Great Wall Securities, believes that currently, he has not heard of the practice of using wind energy in the city to generate electricity worldwide. Even if the subway company agrees to develop such a project, it will be difficult to attract the interest of investors.
Wang Mengshu, an academician of the Chinese Academy of Engineering, is also not optimistic about this project. He believes that the idea of using wind energy in tunnels to generate electricity is simply impossible and technically unreliable. He said that trains running on metro lines have time intervals. At present, Beijing's fastest Line 1 generally has an interval of more than 2 minutes. As a result, even if a small wind turbine is installed in the tunnel, it cannot obtain sustained and stable wind power.
Since the two parallel subway tunnels are every 400 to 500 meters, they are connected by passages in the middle. In such two tunnels, the wind generated by the subway train passing through will enter the other tunnel. In addition, the trains in the two tunnels run in different directions, so the directions of the wind are also different. Therefore, it is difficult for wind power equipment to operate continuously and stably.
In response to experts’ doubts, Zhong Yan said that in some actual tests they conducted, they have not yet found the problems caused by the wind direction of the tunnel mentioned by Academician Wang Mengshu. In response to the questions raised by the experts, they also wanted to communicate with relevant experts including Academician Wang. For safety, they have considered designing the wind rotors mounted on both sides of the subway tunnel into slender cylindrical wind rotors.
Have you ever considered the wind tunnel principle for tunnel power generation? The operation of the subway requires the excess air in front to be pushed to the back of the car as quickly as possible. In this way, the locomotive can operate with minimum energy consumption. Adding some wind blocking facilities around the tunnel will definitely affect the speed and energy consumption of the locomotive. Adding some wind turbines around the tunnel will increase the windward area of the locomotive front. Increase wind resistance.
Will adding a wind turbine to the front of the car increase the driving resistance of the car?
The wind at the front of the car is divided into two types:
One is the wind generated by its own kinetic energy (relative wind). Where does this energy come from? It is converted into electricity by itself. Do you want to convert it into electricity again? Isn't it a waste of energy to go around like this?
The second is the natural wind from the outside, which can be divided into three types: 1. Wind from behind; 2. Wind from the side; 3. Wind from the front.
1 can be used; 2 can also be used; 3 may be used, but it is estimated that the available power is not very high. Think about how much power such a large wind turbine on the front of the car can generate?
The most important thing is that the first wind is the main wind for the vehicle. The second wind can almost be ignored and is of no use at all..
So, in order not to mess around and waste energy, in reality no one will install a wind turbine on the car.
From the perspective of energy conservation, it will definitely increase car consumption.
The streamlined body design is to reduce the wind resistance of the vehicle as much as possible. According to aerodynamics, if you add a protrusion on a streamlined surface, this protrusion will definitely increase the wind resistance coefficient of the vehicle. , that is, the driving resistance of the car increases.
According to the relationship of conservation of capacity, due to the efficiency problem of the wind turbine, there is mechanical wear and energy loss, so under the premise of receiving the same capacity, the power generated must be less than the resistance received by the car.