Chapter 459 This is a good thing!
Gao Zhendong drank water while looking at the system store.
This has been his habit during this period. He always goes to see if the thing is still there every day.
Fortunately, I have always been there. It seems that my feelings are really not for sale. Maybe the rich girl in school broke up with her boyfriend, so this thing fell into the hands of the boss? Gao Zhendong thought rather unreliably.
Just as he was about to close the store, something suddenly flashed in the corner of his eye, which seemed different from before.
It should be from an outdoor store. This store is a good place. At least that's where the thermal imaging camera came from.
Gao Zhendong remembered seeing this thing before, but this time there seemed to be a few more words.
——Outdoor refrigerator (with refrigeration).
Gao Zhendong has seen this thing before. It is just an insulated bag made of thermal insulation material. Put some ice cubes and ice cream in it to ensure that it does not melt for a period of time, but it is different from the real thing. In the sense of a refrigerator, it has lost its old nose.
But this time, the three additional words at the end made Gao Zhendong interested.
Is this the original money-grabbing product that was hard to sell, and the owner of the outdoor store was finally willing to update the product?
If Gao Zhendong remembers correctly, there were two types of outdoor or car refrigerators with refrigeration that he saw in his previous life.
There is a kind of semiconductor refrigeration unit with a fan for heat dissipation. The effect is quite ordinary.
The other type uses a small compressor. This thing is the same thing as the refrigerator that everyone often talks about. It is just smaller in size and power, but the refrigeration is better than the semiconductor refrigeration chip.
Thinking of this, Gao Zhendong's interest in this outdoor refrigerator suddenly increased. It's a good thing, it might be useful!
Without hesitation, he took it out of the store.
Well, it’s interesting. It’s basically the same as what I saw. It doesn’t seem like there need to be too many age-appropriate changes.
I couldn’t wait to open the manual in my mind.
——Semiconductor refrigeration!
This result made Gao Zhendong overjoyed and laughed out loud.
What I want is the semiconductor refrigeration chip!
Semiconductor refrigeration uses semiconductor P and N thermocouples. When a voltage is applied to both ends, a temperature difference will be formed on the upper and lower surfaces of the thermocouples to perform refrigeration.
Yes, there are thermocouples here, but they are just the opposite of thermocouples that measure temperature. Thermocouples measure temperature by forming a thermoelectromotive force based on the temperature difference between the hot end and the cold end. The semiconductor refrigeration chip, in turn, uses electromotive force to obtain the temperature difference.
In fact, although this thing did appear around 1960, its core principles and phenomena had been noticed as early as the 19th century, namely the Seebeck effect in 1821 and the Pearl effect in 1834. Peltier effect, Thomson effect in 1855.
Although these effects were observed at the beginning, because the principles were not understood, the effects of the things produced were extremely poor and had no practical significance.
There were no semiconductors at that time, so antimony-bismuth (Sb-Bi) thermocouples were used. As for the effect, it can only prove that this thing is useful in principle, but in fact it is useless at all, and the cooling efficiency is less than 1%.
Later, with the development of semiconductors in the 1950s and 1960s, the correct key to open this door was found.
However, people who use portable refrigerators generally don’t like this thing because the cooling effect is not good. Common semiconductor refrigeration refrigerators can have a temperature difference of about 20 degrees from the ambient temperature, which is considered good. .
But Gao Zhendong is different, he wants semiconductors.
He knows one thing, that is, semiconductor refrigeration chips can actually reduce the temperature to a very low level. The reason why portable refrigerators are not very powerful is due to issues with material specifications, cabinet design, There is also the issue of thermal design.
Yes, the semiconductor refrigeration chip needs to dissipate heat. At its hot end, the heat must be dissipated quickly to provide continuous cooling and achieve good cooling effects.
The original body of the line-scan thermal imaging camera obtained by Gao Zhendong was a civilian uncooled thermal imaging camera without a refrigeration system, which greatly reduced its actual effect.
When Gao Zhendong was making a practical line scan thermal imaging camera, he would definitely need to add a cooling system. This brought up a question, how to cool it?
This is different from the missile. It is a one-time deal. Just use a cylinder to compress the air to expand, absorb heat and cool down.
Compressor? That thing starts slowly, has a complex structure, and is difficult to use. It cannot be used except as a last resort.
There is no other refrigeration technology that can be used in military equipment that is cheap, easy to use, easy to maintain, and easy to maintain!
The semiconductor refrigeration chip is different. This thing is all solid-state, light, thin, easy to install, easy to arrange, and has good reliability. Even with a powerful heat dissipation device, it is better than a compressor. Go out eight hundred streets.
And the temperature control is precise, the cooling is fast, and the switching between hot and cold is convenient.
Of course, it is not without its shortcomings, such as low efficiency and poor economics, but these are not problems under specific requirements. Low efficiency will work wonders, because low efficiency and low cooling capacity are two different things. They just mean It just costs more power to feed it.
In Gao Zhendong’s previous life, this thing was originally the first choice for refrigeration for many military equipment.
Gao Zhendong also wanted to do it, but he suffered from the fact that he didn't do much research on this thing in his previous life. He just knew it, but didn't collect any materials. It was not easy to do it based on what he had in his head, mainly because he didn't know what materials. Now with this, all problems are solved!
Gao Zhendong is not worried that the semiconductors in this refrigerator are not easy to use. What he wants is principles and materials. The habit of semiconductor factories in previous generations must be to use the best ones. The types of materials are just slightly different in specifications, but there is no problem with the type of materials.
Bad material types have been eliminated early on, and even if manufacturers want to maintain production lines of low-performance materials, they usually end up losing money.
For example, with the advent of cadmium mercury telluride and indium antimonide, lead sulfide has basically disappeared in military infrared, and the same is true for civilian use.
Moreover, the structure of the semiconductor refrigeration chip is very interesting. It is actually a thermopile composed of semiconductor thermocouples, and this composition can be connected in series, parallel, or series and parallel... This means that even if the materials are poor, miracles can be achieved!
This is very comfortable.
So Gao Zhendong couldn't wait to read the instructions for this refrigerator in his mind. Sure enough, in the refrigeration part, he very considerately explained the materials of this refrigeration piece clearly.
A ternary solid solution alloy based on bismuth telluride, its P-type semiconductor is Bi2Te3-Sb2Te3, and its N-type semiconductor is Bi2Te3-Bi2Se3.
It seems a bit complicated, but it doesn’t matter. The explanation is very complete, including theory, and this thing does not have high requirements for the crystal structure. It requires that the thermocouple should be short and thick, not slender, so see The refrigeration fins we received are all in the form of sheets instead of rods. As for the processing technology, hehe, there is no explanation of the process.
Even the structure is clearly explained. What Gao Zhendong wants to do is a bismuth telluride matrix.
And for Gao Zhendong, this matter is very similar to DJS-59. In theory, he only needs to prove that he has started working on a bismuth telluride matrix, and then take this matrix to the 1274 factory after a while. Just doping.
In short, he only needs to prove that he has this research process, and then he can show this thing to everyone.
Thinking that his line-scan thermal imaging camera was even more powerful, Gao Zhendong couldn't help but hum a song.
Lou Xiao'e was lying on the table, resting her chin on her hands, looking at Gao Zhendong like this, and smiled. She didn't know why Gao Zhendong was happy, but seeing Gao Zhendong like this made her happy.
The couple was having fun when they suddenly heard a commotion in the middle courtyard, as if a child was being beaten and screaming.
Is the middle school beating a child? This is rare. The Jia family has the most children there.
The couple looked at each other, walked around, and watched the fun.
It doesn’t necessarily have to be managed. People educate their children, but it’s okay to take a look.
With a head full of gossip, the couple walked to the central courtyard. From the nearby houses, people came one after another to watch the fun, and even the other side of the house was alarmed.
The middle courtyard is very lively.
Banggeng ran away screaming in front, while Qin Huairu chased after him with a feather duster, chasing back while shouting: "I told you to waste! I have to beat you to death today, you little bastard!"
Bangge ran to Yi Zhonghai and his wife and shouted: "Grandpa, grandma, help me! Help me!"
The couple probably knew why he was beaten, and smiled: " This can't save you, just let your mother give you a few blows to calm down." Seeing that there was no chance, Banggeng turned around and threw himself into Shazhu's arms: "Uncle He! Help! Save me, I know you are the best!”
Silly Zhu seemed quite moved, and he was about to speak with a shy face: "Sister Qin..."
Qin Huairu raised the feather duster and pointed at him: "Silly Zhu! Don't talk! If you help him, I’ll beat you up too!”
Silly Zhu was frightened all of a sudden, he giggled, and then pushed the stick out, and there was another blow on his butt. After being beaten several times, he broke out of the fucking encirclement. He was so sick that he sought medical treatment and ran to Gao Zhendong.
"Uncle Gao, Uncle Gao, save me! Save me!"
Not to mention, he has found the right person. It will be difficult for Qin Huairu to take action against Gao Zhendong. Be careful to hit Gao Zhendong. She knew that with Gao Zhendong's character, she wouldn't care, but in that case she would feel uncomfortable.
Gao Zhendong asked with a smile what was going on, and Qin Huairu told the story angrily.
The problem was not serious, but Xiaodang was greedy, so Banggeng took two tubes of toothpaste at home and exchanged them with the scrap collector for a piece of Cuban sugar, which he and Xiaodang drank in the water.
And the elder brother was quite decent. He even fed Jia Zhenzhen a few mouthfuls.
The only problem is that the two tubes of toothpaste still contain toothpaste in the morning, one is new and the other is half full.
The Jia family has a large population, so they always have one tube for each toothpaste.
This kid squeezed out all the toothpaste and threw it away, then replaced it with sugar.
(End of this chapter)