"Solar water heaters aren't easy to do."

"If it's a solar water heater in the true sense, of course it's not possible, whether it's a glass vacuum tube, a metal collector, or a ceramic heat-absorbing coating, we can't make it, let alone need a circulating pump and a series of temperature sensing and automatic control devices, but we don't need to be that complicated now.

"Because of the small amount of water?" Chen Duan tried to ask.

"That's right, even if it's just a piece of iron wrapped in water and dried in the sun, it's enough for us."

Tang Jing sighed, "So, heating is actually not difficult, our biggest problem is heat preservation." ”

"Is it feasible to make something like a thermos?"

"As you know, the most critical part of the thermos flask is the vacuum liner in the middle, which we can't do now."

"But if you can't keep it warm, there's not much point in heating."

"Is it okay to use an off-the-shelf solar installation?"

"Theoretically, yes, but it doesn't seem to be available in school, and even if there is, it's almost impossible to operate."

"So, we talked for a long time, but it was still in vain."

"Of course not." Tang Jing smiled and said, "When I tell you about this issue, I actually want to talk about another thing. ”

"What's the matter?"

"Solar energy is actually very space-consuming, and if we install such a big thing outdoors, it is estimated that it will be remembered in a few days, so ......"

"You don't want to ......" Chen Du already understood a little, and subconsciously raised his head.

"That's right, solar, of course, on the roof." After Tang Jing finished speaking, he stretched out his hand and pointed to the top of his head.

"Huh?" Wei Dalei raised his head stupidly.

The storage room is 28 meters high, and it is a skyscraper for them, and they can only see a ceiling anyway, and the details are not clear.

But now it's talking about installing a solar on the roof?

"That's a bit of an exaggeration." Dong Junwei couldn't help muttering.

"Not yet, of course, but definitely not far." Tang Jing said with a smile.

Many times, what Chen Du envies is not Tang Jing's knowledge and mind, but her self-confidence that she can control the future.

Tang Jing continued, "But what I want to say is that the use of the height of the entire room is something we need to consider next. ”

"Isn't it too early?" Dong Junwei frowned.

"It's not too early, we can use the wall first."

"Walls?"

"Well, it's like the lookout on the door, except that the walls are thicker and more difficult."

Chen Du nodded in agreement, "I tried it last time, the white ash on the wall is loose, constantly falling off the powder, there is no way to renovate it, anyway, this house has not been built for a long time, why is the quality so poor?" ”

Tang Jing said with a smile, "Strictly speaking, these small houses are all illegal buildings and are temporary, just because they are built in the school and no one cares about them, so when they are built, they will definitely not pay attention to it, and they will use relatively inferior materials." ”

"It's not going to collapse." He Ying was worried.

"It's not that much, it's difficult for this kind of small house to collapse, it's just that, like wall paint, in order to save money, I won't use good latex paint, it seems that I just used lime water to paint two layers, and the proportion of lime water is not adjusted."

"Add alum and salt." Chen Du nodded.

"You still paint walls?" Tang Jing tilted her head and asked with a smile.

"I've helped people before."

"At the earliest, there were people who added rice soup, but your way is relatively old, and the really processed hydrated lime can be directly used as a coating, and there is no need to add salt or anything, but now, everyone either uses latex paint, or greedy to save trouble and directly add glue to the white ash, this house should be the latter, but it is obviously not done well, and it will not take long to start falling ash."

"Is there any way to fix it?"

"Nope." Tang Jing spread his hands, "I can only shovel off the surface of the wall." ”

"That's a lot of work."

"You don't need to shovel the whole wall, you just need to shovel whichever side you want."

"Okay." Chen Du nodded, "But what exactly are we going to do?" ”

"On the one hand, we had to build a lookout on each of the remaining three walls to prevent people from coming around from behind, but we didn't know it, and on the other hand, I felt that we still needed to do some fortifications."

"For example?"

"Like dropping bombs from the lookout."

"Is it necessary?"

"The strength of Yizhong and Qingbei, you have also seen it, even if we can't confront them head-on, at least we have some means of self-preservation, although we don't seem to have been exposed yet, but after a long time, it is difficult to ensure that we will not be discovered."

"Hmm." Chen Du nodded in agreement, "I hurt so many of them last time, and I robbed Gu Yinglong, No. 1 Middle School must be looking for us." ”

Tang Jing said, "My idea is to build this place as solid as gold first, which can be attacked and defended, and reserve food for at least one year." ”

"A year?"

"The rice we have now can be eaten for almost a year, of course, other things still need to be found from time to time, but with these 12 boxes of rice, it is more bottomed, not to mention that as long as the potatoes are stored properly, they can also be stored for a month or two."

"I have food in my hands, and I don't panic in my heart."

"That's what it means." Tang Jing said with a smile, "In a year's time, even if we don't add new members, I believe that everyone's ability will reach a new height, and at that time, we can do more things and not have to be too afraid of others." ”

"But." Chen Du frowned, "Qingbei and the No. 1 Middle School will continue to grow, and with combat as training, they may grow faster than us." ”

Tang Jing said, "Fighting can indeed train people, but there will inevitably be casualties, although they have a lot of people, but after all, they are only one or two hundred, how much wear and tear can they withstand?" ”

"To be honest, I've always felt that Qingbei's understanding of abilities is far above us, after all, they have a lot of people and have more reference standards, before Song Yu inexplicably killed some small insects on the road, and now we don't understand why."

Chen is generally a positive and enterprising person, but perhaps because of his experience, he often habitually thinks of the worst.

Tang Jing said, "At present, the diversity and complexity of the abilities are far beyond our imagination, and I don't think there is much difference between more than 200 people and 20 of us.

"In addition, whether it is Qingbei or No. 1 Middle School, there is a huge disadvantage."

"What?" Chen Du was curious.

"They don't have me." Tang Jing showed a strange smile.

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