Go Greener Tips

In previous articles we have restricted vehicles to be powered from the electric conductors in the roads, the conductors being equipped from the electricity grid. In this article we think about totally different types of grids. It will be shown that there is a lot of to be gained by generating the ability close to where it’s for use, and at the voltage at that it is to be used. In that approach expenditure on power lines and transformers can be reduced.

A graph showing the power needed by an average family automotive to take care of a given speed on a level road allows us to calculate the facility requirements of vehicles on particular roads. For instance we can take the South African N1 route between Pretoria and Polokwane. This is a twin carriage freeway with two lanes per carriageway. The speed limit is 120km/h for lightweight vehicles and 80km/h for heavies. At these speeds the minimum safe following distance is eighty meters. If we have a tendency to contemplate only light vehicles, this implies that we may have a most of 50 at anybody time on all four lanes in one kilometer of road. The power needed by each vehicle would be 27kW. Therefore the overall power demand would be 1350kW per kilometer of road. If this power was to be provided by solar cells at the roadside, we have a tendency to would require thirteen five hundred sq. meters of solar cells. Assuming that the solar cells are arranged in a strip parallel to the road, the width of the strip would wish to be 1.35 meter (fifty three inches) wide.

If we contemplate the opposite extreme where the traffic is so dense that the speed would be restricted to 50km/h (thirty one mph), the minimum safe following distance is 20 meters. To the present we have to feature the length of the vehicle, taken as five meters. So every vehicle would occupy twenty five meters of road. On all four lanes there would be a maximum of 160 vehicles per kilometer of road. The facility needed to keep up a speed of 50km/h per vehicle is 4kW. Therefore 160 vehicles would need 640kW, or less than [*fr1] that needed at the upper speed.

Currently allow us to look at the significant vehicle equation. If we tend to take the common length of heavy vehicle to be fifteen meters then the length of road occupied by one vehicle (as well as the stopping distance) would be ninety five meters. On all four lanes along there would be a most of forty two vehicles. For every vehicle to take care of a speed of 80km/h would decision for approximately 60kW. Thus the total power requirement per kilometer of road would be 2520kW. If this were to be provided by solar power twenty five two hundred square kilometers of solar cells would be required. The specified width of strip alongside the road would be 2.52 meters (99 inches) wide. The advantage of having solar cells in a strip alongside the road is that the distribution lines will be kept short, minimizing price and power losses.

It is proposed that the facility ought to be generated at the voltage required at the place of use. This can rely on gradient, type of terrain, kind of traffic.

In South Africa, several intercity roads would be suitable for use of solar power in this way. The N14, connecting Pretoria with Springbok in the Northern Cape, passes through a lot of desert and semi-desert. The traffic is light-weight and the daylight ever-present.

Where necessary, solar power can be supplemented by wind turbines. Energy storage systems could be provided to store energy when there’s no wind, or when the sun is obscured by cloud. We have a tendency to favor inertial storage with low-tech flywheels. Such systems are nearly maintenance-free, have a long service life and are highly efficient.

The system proposed in this article is emission-free, is infinitely renewable, practical and efficient. We have a tendency to have shown that the manner to travel in road transport is to use electrical power generated at the site where it is for use, using solar and wind means.

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