Movie black technology

Thermoelectric power generation is not a new thing. The scientific community has already done a lot of research and application on this technology. Similar devices are widely used in spaceflight. Many spacecraft, such as the Apollo lunar module and Voyager, rely on This thermoelectric power generation system provides energy.

The power generating unit has no moving parts, which makes the equipment quiet, long working life and easy to maintain.

Secondly, the supporting equipment only needs a heat source, a cold source, and wires to generate electricity, so the weight is also very light.

However, it is not without shortcomings, and it can even be said that it has a fatal flaw.

That is, the efficiency of power generation is too low.

At present, the more common semiconductor thermoelectric power generation components can emit a voltage of about 3.5V and a current of about 3A-5A when the temperature difference between the two sides of the component is maintained at 60 degrees Celsius. This voltage and current will decrease with the temperature difference. Reduced, the power generation efficiency is still too low.

In thermoelectric materials, the value that measures the efficiency of thermoelectric conversion is called the thermoelectric figure of merit, that is, the ZT value. The higher the ZT value of a thermoelectric material, the better its thermoelectric performance.

In the past, the best thermoelectric material developed by the scientific community has a ZT value of only 2.8, and it has only just broken through to 6 in recent years.

It is generally believed that when the ZT value is greater than 1, the thermoelectric material has practical value; when it is greater than 2, it can be used for automobile waste heat power generation; The material can have more and bigger applications in the future.

However, it is impossible for this kind of thermoelectric material to be used on the Tibetan Antelope.

Although the thermoelectric material with this value is close to the efficiency of geothermal power generation, it simply cannot carry the Tibetan Antelope.

Because the design power of the Tibetan Antelope reactor is 200,000 kilowatts, that is to say, under the condition of full power operation, the power generation per hour is about 200,000 kWh.

If you do not use the technology provided by the system, it is simply impossible to use thermoelectric materials to generate 200,000 degrees of power in the Tibetan Antelope's size of more than ten meters.

The technology used in the system also has the characteristics of this movie world, because this new thermoelectric material uses a lot of nanotechnology, which is consistent with the technology system on the propeller.

So Chen Shen sometimes wonders if such a movie world really exists, or is the system just a detail?

All in all, the efficiency of thermoelectric power generation depends on the capabilities of three aspects of thermoelectric materials, namely, the ability of the material to generate electromotive force under the condition of temperature difference, the ability of the material to conduct electricity, and the ability of the material to conduct heat.

The higher the first two, the better, and the lower the thermal conductivity of the last one, the better, because if the thermal conductivity of the material is good, the temperature difference between the two ends of the material will disappear quickly. Without the temperature difference, the temperature difference power generation will naturally not be able to generate electricity. .

It’s just that the triangular relationship between these three capabilities is complicated. Often, increasing one will reduce the other or two. For example, increasing the electromotive force of a material will reduce its electrical conductivity.

This is also one of the reasons why the ZT value of thermoelectric materials has not exceeded 3 after so many years of research.

The system's technology is to work hard on nanowires and nanocomposite thermoelectric materials.

The nanowire structure has a strong quantum confinement effect and phonon scattering, which can reduce the phonon thermal conductivity that mainly affects the thermal conductivity, thereby enhancing the thermoelectric performance of the material.

The idea of ​​nanocomposite materials is the same, by doping nanoparticles of different sizes in the material to affect the phonon thermal conductivity, thereby reducing the overall thermal conductivity of the material.

At the same time, the system also improved the topological structure of the materials, allowing the ZT values ​​of the two materials to break through the 30 mark in one fell swoop. The power generation efficiency of thermoelectric materials at this level has exceeded half that of ordinary coal-fired units.

It can even be simply said that the Tibetan Antelope is stuffed into a fuselage of more than ten meters with a generator whose power generation efficiency exceeds that of a coal-fired unit. Only in this way can such an exaggerated power generation be achieved in such a small size.

For the next month, Chen Shen stayed at the launch center, following up the progress of the micro-nuclear reactor project and the Tibetan Antelope test.

These days, it's been performing round-trip tests in space.

And different from the first or second experiments, it spent more and more time in space these few times. Sometimes it would not come back after going to space without floating on it for a few days. The orbital flight took eight days.

At the same time, it carries more and more experimental loads.

In the previous one or two tests, everyone was afraid that it would cause accidents when it was too heavy to land, so they only dared to put some basic loads on it.

It wasn't until after one or two tests, by adding or subtracting the plasma reactors in the fuselage, to find out its energy consumption law, and build a set of mathematical models, that it could accurately predict its load limit on the ground, that the launch center dared to let it go. It carries more test equipment.

Therefore, in the past month, scholars in the domestic scientific community have felt that it is a New Year's Eve. The requirements for space experiments have been relaxed all of a sudden. , No matter how bad you are, you will have the opportunity to wait in line.

In the past month, more space tests have been approved than all space tests conducted in China in the past ten years, and the number has increased several times.

Because the other two spare Tibetan antelopes will be put into use soon, and before long, there may be three Tibetan antelopes in space at the same time.

During this period of time, the opposite side has been clamoring that China is deploying weapons into space, intending to weaponize space and force other countries to expand their space armaments.

In fact, other countries have some objections to the intensive flight of the Tibetan Antelope. After all, they are not blind. Just looking at the various space test projects approved in China during this period of time, we know that the carrying capacity of the Tibetan Antelope will definitely not be too high. Low.

Carrying at least one one-ton mushroom is a breeze.

Coupled with long-duration on-orbit capabilities...

Where is this plateau Tibetan antelope?

This is clearly an orbital bomber chicken!

When the face is torn apart, the layer of sheepskin on the body is peeled off, and mushroom bombs are put on it, who can stand it...

Everyone was looking for the H-20, but only now did they realize that the H-20 was by my side? !

It's just that even if there were objections, they looked at the stock market crash and plasma batteries that are still raging now, plus the Feiji who is doing experiments in space every day, and immediately lost the courage to speak out, and only dared to speak weakly. Said, can you not pass by the roof of my house when you do the experiment next time...