Nuna 3


The Nuna 3 is a solar car developed by Nuon Solar Team form the Delft University of Technology in 2004-2005 for the 2005 World Solar Challenge.
It succeeded the Nuna2, the solar car that scored a second consecutive win for this solar team by winning the World Solar Challenge for the third time in a row.
Nuna 3 was one of the favourites for the 2005 edition of the World Solar Challenge with a pre-race test-drive recorded top speed of 130 km/h. The final result was that the 3021 kilometers between Darwin and Adelaide were covered in a record 29 hours and 11 minutes, averaging about 103 km/h.
It has very efficient solar cells of a type normally used to power orbital satellites, and it has better aerodynamics and is lighter than its predecessors.
It was designed and built by 11 students from different disciplines of the Delft University of Technology, who have partly put their studies on hold for this. They used the hightech labs and workshops of the University and, as with the Nuna 2, they received advice from Wubbo Ockels, the first Dutch astronaut and professor at the University.

Main specifications

Design criteria

To have a good chance to win, the car has to:
The solar cells are made of gallium arsenide and consist of three layers. Sunlight that penetrates the upper layer is used in the lower layers, resulting in an efficiency of over 26%. This type of solar cell is among the best available currently. Apart from efficiency, size also matters, so the entire upper surface of the Nuna 3 is covered with them, except for the cockpit.
Efficiency is optimal when the cells are hit by the solar rays perpendicularly. If not, output is reduced by roughly the cosine of the angle with the perpendicular. Because the 2005 race was held in September the sun was lower in the sky. To compensate for this, as many cells as possible were placed at the sides, most notably on the wheel caps.
of a solar cell
A solar cell gives a certain amount of current for a certain amount of sunlight. The voltage depends on the load. The power is the product of voltage and current and therefore also depends on the load. Over a certain voltage the current of the solar cell quickly drops to zero, as the graph illustrates.
However, the batteries have a fairly constant voltage, which also has a rather different value than that of the solar cells. So a voltage transformation is needed. A special type of DC-DC converter is used to ensure the load resistance presented to the solar cells is such that the solar cells give maximum power, so also at the top of the green line in the graph. This is called a Maximum power point tracker. Here too, the goal is to have this conversion achieve maximum efficiency.

Aerodynamic design

The aerodynamic drag is an important part of the total resistance. Important are the frontal surface and the streamline. Any deviation from the ideal streamline will cause turbulence, which costs energy. The ideal streamline is achieved in various stages:
  1. Through computer simulations of the design
  2. Through testing of a scale model in a wind tunnel. For example, liquid paints can be applied to see the flow of air over the surface. The photo shows is taken during one of those tests in the Low Speed Laboratory of the TU Delft.
  3. Through testing of the full scale car in a wind tunnel. For this a German-Dutch wind tunnel in Emmeloord will be used.
From meteorological data from the area where the contest is to take place, it can be concluded that there will likely be a strong side-wind. The wheel caps of the Nuna 3 are designed such that a sidewind will have a propulsory effect.

Motor

The electromotor is totally encased in the rear wheel to minimise loss through mechanical transmission from motor to wheel. The motor is an improved version of the original 1993 Motor of the Spirit of Biel III by the Engineering School of Biel, Switzerland . The improvements are due to completely redeveloped digital power electronics and control, realized 1999. They allowed for 50% more power and a 45% higher torque compared to the 1993 Spirit of Biel II. The efficiency of the total drive system is also improved and is now over 98%. But as the graph shows this depends somewhat on the speed and increases with speed. The design was initially made to reach its maximum performance at the normal cruising speed of the solar car at around 100 km/h.

Test drive

During one of the test drives in the Netherlands the Nuna 3 achieved a speed of 130 km/h. On the first day of the race the car achieved a top speed of 140 km/h. For comparison, the Sunraycer attained a top speed of 109 km/h in 1987.

Important opponents

The winner of the North American Solar Challenge from the University of Michigan was considered to be one of the most important opponents. Other important contestants were the MIT and the Japanese Ashiya University team. In 2005 there were also two other European contestants, the Dutch Raedthuys Solar Team from the University of Twente and the Belgian Umicore Solar Team from Leuven.

2005 race monitor

This average speed, which could lead to maximum speeds of 140 km/h speeds on downhill section, well exceeding speed limits on the Australian highway, has led to rules changes for future races.