"And that's not all." Seeing Zhang Dingjun's chuckle, Zhang Lan began to guess what this guy was thinking in his heart, could it be that this guy also remembered his experience on the submarine? This naval commander. But he was born as a real submariner, if this guy remembered his experience as a soldier on a submarine because of his own words, Zhang Lan also felt that there was something strange.

However, Zhang Lan doesn't care what Zhang Dingjun thinks, and now he will not forget what his current role is: his company's voluntary product promoter, "The submarine mail system can also work directly with pure oxygen."

The oxidizer used in the submarine mail system is liquid oxygen, which is gasified and enters the fuel chamber or fuel cell. ”

"For the heat engine. If you work directly with pure oxygen, it will produce a very high temperature, and the general material can't stand it, and if you use special alloys to make the heat engine, the cost is not cost-effective, so if you let the heat engine use pure oxygen. It is necessary to dilute the liquid oxygen with other gases or reaction product gases before it can enter the heat engine for combustion, which virtually increases the complexity of the oxygen supply system and increases the weight and volume of the system accordingly. ”

"But the fuel cell doesn't have these troubles, it can work with pure oxygen, and when it works with pure oxygen, it can output more power than the mixed gas used in the heat engine. And most importantly, the oxygen supply system is simple, saving valuable volume and weight, and the space and weight saved can carry more weapons, which is for a submarine that can only carry a fairly limited number of weapons at a time. The temptation is undoubtedly very great. ”

When Zhang Lan said this, Zhang Dingjun could no longer hold back the surprise in his heart, and finally was surprised, he really didn't expect it: this kid not only knows a lot about military knowledge, but also when he expounds these things, the logic is clear and organized, and he actually says the truth in it!

And most importantly. If it weren't for the researchers and experts who have been immersed in it for a long time, these concepts and materials mentioned by this kid would not have been able to say such a rule-based thing, because these things are so professional that they are all the result of accurate summarization after knowing a large amount of information.

Zhang Dingjun just thought that Zhang Lan was just a military enthusiast before, and during this period, his impression of Zhang Lan went through the stages of Xiaobai, junior military enthusiast and military enthusiast, originally thought that his evaluation of this kid was high enough, but now, Zhang Dingjun found that his evaluation of this kid is still low, where is this kid an amateur military enthusiast, he is clearly an expert-level little guy.

Can be one. A new question popped up in Zhang Dingjun's mind again, how could this kid be so interested in boring scientific research? Could it be that the Alice Group had already predicted that fuel cell technology would shine in the new century?

Just thinking about companies such as Boeing, Airbus, and Xierzi, which were originally companies with deep business between military supplies and civilian supplies, Zhang Dingjun was quickly relieved in his heart: Haven't domestic military enterprises also begun to transform to civilian products, and it is not strange that a large company like Alice Group is involved in both military and civilian products at the same time.

At this moment, Zhang Dingjun's heart quickly became a lot.

Just when Zhang Dingjun was surprised and kept revising his evaluation of Zhang Lan, he didn't expect that Zhang Lan's words were not over here, "The same as the one I just said is that because the energy generation method of fuel cells is not like the combustion of heat engines, so when the fuel cell group is working." Infrared radiation is very common at the bottom of the sea, and it is not easy for satellites and other monitoring equipment to detect its traces. The use of proton exchange membrane fuel cell, when working, the working temperature is only about Tian Celsius, far lower than the working temperature of the traditional heat engine, than the use of other mail systems, the infrared radiation intensity is much lower, more conducive to improve the concealment of the submarine. ”

At this moment, Zhang Lan is like an addicted kid, like a little matchmaker, where the captain Zhang Dingjun chattered about the advantages of fuel cells, and advertised his products by the way, "The most important thing is that." Most of the current fuel cells adopt modular design, and the battery module of the fuel cell pack is composed of several unit stacks connected in series and in parallel, compared with the traditional lead-acid battery for submarines. The fuel cell pack is easier to install, daily maintenance and repair, and it is also convenient to replace the new stack in time, which greatly improves the reliability and maintainability of the power system, which is more obvious in wartime. ”

This is nonsense, in the time of war, both sides are injured at the same time, one side will replace the broken thing with a new one like a push-pull drawer, and the other can only be forced to return to the base, which one. More dominant? This is simply self-evident.

While speaking, Zhang Lan didn't forget to secretly look at Zhang Dingjun's expression, judging from the somewhat daze expression on Zhang Dingjun's face, well. A word shocked this guy. Zhang Lan couldn't help but feel mixed joy in her heart.

Xiao Chenxi and Alice have also been paying attention to Zhang Lan's movements, watching Zhang Dingjun stunned by what Zhang Lan's little guy said. The two little girls were very funny, although they were polite and didn't laugh out loud, but the faces of the two little girls were still filled with a satisfied smile: This guy is good, let you Zhang Dingjun look down on people. Hmph, how's it going, you're being blown away now, right?

Since fuel cells have so many advantages, it will naturally make countless people blush among the objects of this blushing, including the Chinese Navy, which is very jealous of the Germans' Han technology and is trying to break through the blockade of the Americans' first and second island chains.

At present, the vast majority of the submarines equipped by the mainland navy are conventional-powered submarines with low performance, and the inherent shortcomings of conventional-powered submarines make the navy inherently inherently deficient in throwing off the US aircraft carrier formation to make a confrontation. If you can master the skills of the Han submarine, what kind of significance it has for the Chinese Navy, as long as you are not blind, everyone can see this.

It is a pity that the Americans absolutely do not want the mainland navy to master the technology of mail submarines, and they absolutely do not want to see the mainland, which has a great headache of itself, master four submarines that are no less than attack submarines in some respects, and the Europeans are naturally not stupid, and they will not be stupid enough to sell such technology to China. ,

In this case, it seems that the technology of Alice Group in fuel cell is the most likely to be obtained by the navy, although the domestic military does not know what the strength of Alice Group in fuel cell technology is, but last year Alice Group's use of fuel cells as the power of the mountain... The stimulation of the concept car to the domestic military is definitely no less than the stimulation of the concept car to the Japanese.

Don't forget, after all, the Alice Group is still one of the equipment buyers of the domestic military, if it can get fuel cell technology from the hands of the Alice Group. Even if you take a step back, it would be a good fit to get the right fuel cell stack from the Alice Group to equip your own navy's submarines. If it really succeeds, the deterrent power of the submarine force of the mainland navy will definitely be greatly improved.

Of course, all this can only be continued if Alice Group can perfectly complete this submarine battery modification task, and it is still a little early to talk about this issue, but it has to be said. The above is full of great expectations for this cooperation with Alice Group.

"In that case, isn't there a downside to fuel cells?" Although he had been shocked by Zhang Lan's knowledge of fuel cells, Zhang Dingjun was very dissatisfied that he was bluffed by Zhang Lan, and the strength of not admitting defeat in his heart surged up, and he couldn't help asking.

"Of course there is, although the specific energy of the fuel cell system is higher than that of other heat engines, and the energy conversion efficiency of fuel cells is not controlled by the Carnot cycle, which is more than twice that of other heat engines, and the specific energy of fuel cell systems is much higher than that of other best heat engines. This means that under the same fuel storage capacity, submarines equipped with fuel cell systems can travel nearly twice as long underwater as those equipped with other mail systems. This determines that the fuel cell Han system will be applied in submarines first. To Zhang Dingjun's surprise, Zhang Lan did not refute at all, but directly nodded and admitted that the current fuel cell technology does have its own shortcomings, "But it does not mean that the existing fuel cell technology has no shortcomings." The volume of the existing fuel cell stack is still relatively large, the output power is low, and the technology is quite immature, to put it harshly, the fuel cell manufactured by the current fuel cell technology can only be called a semi-finished product. ”

Of course, if fuel cell technology had no shortcomings now, it would have been popularized a long time ago, how could it have waited until today? But Zhang Lan, this kid is also tight, he doesn't say what are the shortcomings of fuel cell technology, but what are the shortcomings of fuel cell technology under the existing technical conditions, although it is just one more word. But the implication is a hundred and eight thousand miles away: Can the first car built by Carl Benz be as technical as any of today's cars?

Of course not! But no one can deny the significance of Karl Benz's car, which can only be called rudimentary, to the modern automobile industry.

"Is that all?" Zhang Dingjun seems to be quite unrelenting, but Zhang Dingjun understands it very well in his heart. In fact, this is exactly the atmosphere of discussion that military enthusiasts liked the most before.