Short video spoiler history: The beginning of modern warfare

Chapter 127 Principles of Air Conditioning and Refrigeration
"Vegetable Basket Project, what a historical term. I rarely hear this term since I stopped watching TV."

"I'm from the Northeast. When I was a kid, I stockpiled cabbage every winter. I'd buy hundreds of kilograms at a time and pile them up like a wall. Sometimes the school would give us a day off to go home and help move the cabbages."

[Recently, the high temperature heat wave has frequently become a hot topic. In areas such as their capital Delhi, Punjab, Haryana, the highest temperature is almost 50 degrees. The lowest temperature in a day is also above 30 degrees, which is even more exaggerated than a steam room, and it is the kind of steam room that is open all day long.]

[Like when you click on the map of New Delhi and look down, there are densely packed residential areas and no green plants at all. This level of urban construction leaves the world speechless. Isn’t it time to learn about the urban heat island effect? ​​]

[In addition to urban construction, the popularity of hardness is also related to their blind promotion of industrialization. Industrialization is not a simple production line, production equipment and industrial workers, but also involves energy supply issues, especially electricity supply]

[At a time when there was a huge shortage of electricity for people's livelihood, a number of enterprises with high electricity consumption were forced to join the government. However, they did not have any high-level power enterprises, only low-efficiency coal-fired power plants, and hydropower was not enough. Although they also had nuclear power, with 7 nuclear power plants and 23 nuclear reactors, their power generation only accounted for 5% of the total power generation.]

[So they still mainly rely on thermal power generation. The advantage of thermal power generation is that it is simple and easy to use, but the pollution it causes is particularly serious. Greenhouse gases such as carbon dioxide and sulfur dioxide will cause the greenhouse effect in industrial areas to grow extremely fast.]

[What's even more amazing is that the southwest monsoon brought by the summer ocean currents and the high temperatures caused by industrial pollution emissions are blocked by the Himalayas, which prevents the temperature from spreading and can only accumulate under the Himalayas. That's how the temperature in their industrial areas reaches 50 degrees.]

[This creates a strange sight. At the same latitude, just across a mountain, it is scorching hot over there, while it is only 20 to 30 degrees here, and we don't even need to turn on the air conditioner. Speaking of air conditioners, data shows that only 5% of households have air conditioners, but even if they do, they don't have the electricity to turn them on.]

[This is the harm of forcing industrial projects without industrial technology. We have tasted this bitterness before, but we turned back in time and vigorously developed the clean energy industry. At the same time, we vigorously promoted the improvement of coal power generation technology, coal gasification and liquefaction technology, and combustion optimization technology.]

[These technologies are owned by China but they restrict exports. We also restrict exports. These are the cornerstone technologies of industrialization and cannot be easily exported.]

In front of Fengtian Hall.

Zhu Yuanzhang, Zhu Biao and others couldn't help laughing when they saw the regional temperature map provided by Tianmu.

From the map, we can see that the areas south of U-Tsang, including Malwa, Bengal, Myanmar, Siam, Annan, Laos, Zhenla and other places, are all yellow and red, while the basic temperature of the national border in later generations is ten to twenty degrees lower.

"What's the highest temperature in Jinling City in recent days?" Zhu Yuanzhang asked curiously. Because there were people watching the temperature, someone quickly reported a number, "Twenty-eight."

The ministers nodded. According to the usual temperature, the highest temperature this year is about 30, while the lowest temperature in Malwa (hardness) is over 30.
"How can you sleep tonight?" Everyone was curious. Could it be that you are made of iron and are not afraid of heat?

"If there are no other cooling measures, people will be sunburned to death." Liu Ji also shook his head. People are fine because they know to hide in the house and under the shade of trees, but the crops are in trouble. If such high temperatures cause drought, the consequences will be even more serious.

"The Himalayas are truly the guardian mountains of the country." Even Zhu Yuanzhang couldn't help but laugh. He was not gloating, but simply sighing. He didn't expect that the barren land for thousands of years would play such an important role.

"The water vapor carried by the so-called southwest monsoon is probably blocked." Liu Ji sighed. Tianmu had already mentioned this when talking about typhoons. Various monsoons actually carry a lot of water vapor.

It seems that every peck and every sip determines blessing or disaster.

“Is this the knowledge taught in geography classes in later generations?” Everyone was a little surprised. Although this knowledge did not seem to be of much use for the time being, it was the cause of many phenomena. It was quite wonderful to look at the problem from the perspective of globalization as a whole.

"It turns out that the gas emitted by the burning of coal mines can also pollute the air and cause the temperature to rise."

"There is also the coal gasification and liquefaction technology to improve the combustion efficiency of coal mines, etc., which also need to be studied." The Science Department and others also recorded it. Originally, they thought that this thermal power generation technology could be built and at most the power plant could be expanded. Unexpectedly, there are so many tricks in it. It seems to be a very advanced technology.

"It turns out that coal can really be vaporized. No wonder they call that big blue barrel a gas tank." Everyone focused on different things. There was really too much information mentioned in the sky curtain, so everyone was able to deduce some information from it, which completed part of the content, but the details of various technologies were still not mentioned.

But think about it, even in later generations, these technologies were restricted from export, which is enough to prove their importance.

"The current clean thermal power generation technology is banned from sale, and several countries with the technology jointly signed it"

"The Himalayas is a big air conditioner, and the external unit is placed in India [狗头]"

《52 degrees is the water temperature for my bath in winter》

"You probably don't know anything about 52 degrees. At most 40 degrees is too hot [covering face]"

"The high temperature at least solves the problem of not having enough clothes to wear. Then the only problem left is not having enough food to eat. [狗头]"

Tang Dynasty, Chang'an City.

Li Shimin and others were a little choked. Whether it was what Tianmu said or the pictures of temperatures in various regions posted in the comment area, it can be seen that there are basically not many temperatures above 30 degrees. Even in Guangzhou and other places, the temperature is below 20 at night.

You should know that Guangzhou's latitude and hardness are similar to many places in the north.

"Could this be such a coincidence?" Many people couldn't believe it.

"Obviously." Cheng Yaojin spread his hands. It was just a coincidence that the entire Central Plains had hardly suffered any disasters. The civil and military officials felt amused and gloated at the same time.

Of course, people still have no idea what 50 degrees is, but when they see it compared to the temperature of bath water, they instantly understand that people are adapted to the same water temperature. Even people in later generations would find the water temperature hot. "Will we get roasted while walking on the road?"

".Then, I can only wish them good luck!"

[In the hot summer, our lives are saved by air conditioners. In fact, the principle of air conditioning refrigeration is not complicated. It is mainly composed of several parts, namely the compressor, expansion valve, and evaporative heat dissipation copper tube. The most important one is the compressor. ]

[The principle of the compressor is also very simple. You can think of it as a bicycle pump. We have learned it in junior high school physics. When the air is compressed, the distance between molecules decreases, the frequency and energy of collisions between molecules will also increase, so the temperature of the air will rise.]

[The function of the compressor is to compress the low-temperature gas transmitted from the room into a high-temperature and high-pressure gas of 80 degrees. The compression and heating here are mainly to create a huge temperature difference. Then the high-temperature and high-pressure gas comes to the condenser outside through the pipeline.]

[At this time, there is a large temperature difference between the 80-degree high-temperature gas in the pipe and the normal temperature of less than 40 degrees outside the condenser. After being cooled down at a high speed by the large fan of the condenser, the high-temperature gas suddenly loses heat and condenses into liquid, which is the same principle as the condensed water droplets on the body of an iced Coke bottle.]

[Although the refrigerant in the pipeline is cooled by the fan and restored from gas to liquid, its own temperature has not dropped much, and is still more than 50 degrees, which is far from the sub-zero temperature required indoors.] [So it needs to be cooled further to achieve the cooling effect. At this time, we need to use an expansion valve, which controls the flow of the refrigerant to achieve different cooling temperatures.]

[In fact, its principle is very simple. There is a very narrow area inside the expansion valve. When the refrigerant passes through here, the pressure will be released instantly.]

[As mentioned earlier, the temperature of air will rise after being compressed. Conversely, the temperature will drop when the pressure is released. After the refrigerant passes through a narrow area, the pressure is released and the temperature drops sharply. The expansion valve controls the flow rate of the refrigerant to achieve temperature regulation.]

[Finally, the cooled refrigerant passes through the evaporator (arranged copper tubes) and is sent into cold air through the fan. The refrigerant absorbs the heat in the air and the temperature rises again. Then this part of the refrigerant enters the compression stage again. The cycle is the principle of air conditioning.]

[Finally, let’s talk about refrigerants. We generally use ammonia or Freon. How to make ammonia.]

In front of Fengtian Hall.

All the painters were busy as hell, no one knew that the skylight would suddenly become like this, especially something as important as air conditioning.

Looking at Tianmu's rapid speaking speed, the painters did not dare to be careless. Fortunately, the compressor, expansion valve, and evaporation copper tube mentioned by Tianmu were extremely simple, and most people had seen the corresponding objects, so some things could be replaced by words.

For example, the power under the compressor should be provided by electricity. Its air inlet is connected to the end of the evaporator copper tube group, and the air outlet is connected to an external unit copper tube group. A fan is used to cool the external unit and condense it into liquid. This part of the liquid is then cooled to below room temperature through the expansion valve, and then passes through the evaporator copper tube group. There is also a fan behind the copper tube.

"This is too simple!" Even Liu Ji and others couldn't believe it. They all understood the principle. It was through the operation of increasing and reducing pressure, and using the temperature difference to condense the gas into liquid.

“What a clever design.”

"How low can the temperature be lowered by the air conditioner?" People in the science department began to pay attention to the actual effect of cooling. Everyone knew that the actual effect would not be bad, but they were still a little itchy.

"You'll know once you make one."

"It's easy to say, the most difficult part here is the preparation of refrigerant." Everyone looked at the demonstration picture given by Tianmu and felt that the compressor was not difficult. It was just a simple piston compressor that was driven by electricity from the bottom.

Whether it is the production of ammonia or Freon, they are all chemical subjects that they have not been exposed to much. All they know about this subject is that carbon burns to produce carbon dioxide, and incomplete combustion produces carbon monoxide, and that's all.

"With the corresponding production steps, we will succeed step by step." Everyone encouraged each other.

Hu Weiyong, Liu Ji and others were also somewhat tempted. This is an air conditioner, which is known as a summer heat-relieving artifact along with watermelon. It is a must-have artifact for every household. From the previous video, we can see that Tianmu had a subtle contempt for the low popularity of hardness air conditioners. They have long heard of this magical object.

You know, even in the palace, the most luxurious enjoyment in the hot summer is to drink some iced sweet water.

The heat-relieving effect of iced sweet water is actually very limited, and it can only last for the time of an incense stick at most. But air conditioning is different, as long as you don’t turn off the power, it can keep on.

"Without saying too much, as long as we can lower the temperature from 35 to 36 degrees to 20, no, around 25, it can be considered a supreme enjoyment." Hu Weiyong said. If this thing was sold directly in an electrical appliance store opened by the court, the merchants and nobles in Jinling City would definitely fight to the death for it.

Everyone looked towards His Majesty.

Zhu Yuanzhang was also somewhat tempted. Seeing that his ministers were eager to try, he followed their wishes and asked the people in the Ministry of Works to try to make one. In fact, any discerning person could see that the preparation of the refrigerant was a bit troublesome, but there were basically no problems with the other components.

The people in the Ministry of Industry are idle anyway, and he can't stand seeing his subordinates idle.

"This doesn't count as seeking enjoyment. After it's made, I can sell it in an electrical appliance store to create fiscal revenue." Zhu Yuanzhang found an excuse for his behavior in his mind. He didn't want to compete with the people for profit, but the Ministry of Science and the Ministry of Industry invested so much manpower, financial resources and material resources every month, and there were inventions of all sizes every month. If these inventions were not utilized, it would be a waste.

Therefore, the imperial court opened a store in the electrical appliance store. Because its products were well-made and manufactured by the Ministry of Industry, although they were a bit expensive, there were still people supporting it, and the court made a lot of money every month.

Because it was opened in a low-key manner, only a few court officials knew about it. It was inevitable that some bastards colluded with ruffians and gangsters to force the purchase of the electrical appliance store for a few taels of silver, which made Zhu Yuanzhang very angry.
Jinling City.

Many merchants hired a lot of people in their houses just to be able to copy the various technologies mentioned by Tianmu as soon as possible every month.

They were totally uninterested in what we had talked about before, such as hardness, high temperature, and various principles. What interested them was the technology that could be directly manufactured and sold directly to electrical appliance stores.

Air conditioning is one such technology, and a very popular one at that.

As a result, the owners of various electrical appliance stores also started copying, writing and drawing, and they were very busy for a while.

"Boss, this refrigerant is a problem." A worker said in embarrassment. Looking at the series of steps listed on the screen, all kinds of weird symbols and names that he had never heard of, and a substance that he had no idea what it looked like, he was completely confused.

"Yeah, this thing is harder to understand than the Book of Heaven. Even if it knows me, I still don't know it." Another young man spat on the ground and scratched his head in annoyance.

"Humph, it's not impossible just because it's difficult. If it doesn't work once, try ten times. If it doesn't work ten times, try a hundred times."

"Young people should take a long-term view when encountering things, and don't always complain about how difficult it is. How can you know how difficult it is if you don't even try?"

"This is also a good opportunity to train people. When I was young, the conditions were much more difficult than yours now."

"How about this, everyone will work hard for the next period of time, and we will do more research in the evening, okay? Work harder, and the store will not treat you unfairly."

The pot-bellied Zhang Dongjia also didn't understand what Tianmu was talking about. In fact, apart from being interested in the long-legged, plump and enchanting woman in Tianmu, he had no interest in anything else. But this was a cash cow, so he had to treat it with caution.

He also knew that what his guys said was true, but this thing was a matter of whoever came up with it first would be the first to seize the market, so he could only deceive a few young people with words and persuade them to get the air conditioner and refrigerant at any cost.

(End of this chapter)