After cleaning up the remnants of the barbecue fire, he waved to Li Xiang, who was looking across the pile of debris, and left the fourth floor.
Today we are still renovating the underground garage to improve the quality of life of Xiaoqiang.
First check the ice wall at the entrance and exit. It is in good condition. After a period of time, the artificial ice has become more solid and the transparency has increased compared to when it was built. However, a few cracks have appeared on the wall because of this. Apply a layer of new snow to the crack surface to tighten it. If you don’t water it, you’ll see later.
Today's plan is to heat up the underground garage...that is, to set it on fire.
There is water seepage in the underground garage, which means that the temperature of the soil outside the water isolation wall is not particularly low. The soil cools very slowly, and it may take a month to turn into frozen soil if left unchecked.
After the entrance is blocked by a sandwich ice wall with a total thickness of more than 80 centimeters, the main source of low temperature in the garage becomes the ceiling, which is the floor of the first floor.
The shopping mall covers an area of about 1,500 square meters excluding staff functional areas. The current conditions cannot achieve comprehensive insulation and can only be heated selectively.
Wang Qi's choice was to maintain the temperature inside. Directly below the public restroom is the duty room and utility room of the garage. There are exhaust ducts here that are connected to the exhaust vents of the restrooms on each floor.
First, go outside the base building and start work on the outer wall of the restroom. The work is to build snowdrifts.
It is expected that the heated bathroom will remain above freezing for a long time. In order to reduce fuel consumption, it needs to have better heat preservation capabilities.
The snow was thick enough that it was easy to pile up.
Back inside the building, I found some large and small brittle plastic boards and leaned them against the wall inside the bathroom. The added insulation effect was better than nothing.
The door to the duty room had long since disappeared. In order to prevent the direct firelight from shocking Xiaoqiang, Wang Qi used the remaining garbage inside to build a light-blocking wall.
Move some shrub branches and thin pine branches that have been dried for several days from upstairs and set them on fire.
The calorific value of dry wood is about 1.2e7 joules. Wang Qi did not use all dry wood, so it is estimated to be about 9e6.
Fifty kilograms of firewood provide more than 400 megajoules of heat, a small portion of which will be in the form of waste gas, spread more than ten meters outside the duty room through ventilation pipes, and heat the first and second floor bathrooms, and most of which will be heated in the form of photothermal radiation. duty room wall and slowly released into the surrounding environment.
Converted into familiar energy, excluding exhaust gas, it provides 80 to 100 degrees of electrical heating energy for the basement.
In fact, there are very few. The area of the underground garage is larger than that of the first floor. Even in an absolutely insulated environment, the energy equivalent to an average of only 40 watt hours per square meter is even lower than that of household floor heating. Due to the heat transfer between concrete and ice walls, less energy can be retained in the basement after 24 hours, which can increase the temperature of the basement by about five to eight degrees. The temperature of the wall near the fire point and the soil layer behind the wall will be higher. .
Continue to add firewood later, and plan to bring the temperature of the one-third of the basement on the street side back to around plus ten degrees within two to three days. By then, the temperature at the ice wall of the garage should be ideally near zero degrees.
The greater the temperature difference between the inside and outside, the faster the material conducts heat. Even the stagnant air in the basement must abide by the rules. Positive ten degrees is probably the limit that does not affect Wang Qi's normal activities. If he wants to get any higher, he has to guard the fire and find the place at all times. firewood.
Now, we still have to chop wood!
Wang Qi is a hard worker. He agreed to stay at home for a few days, but the plan changed every day. He didn't do any work yesterday because of the outsider's affairs, and he didn't want to leave the work until tomorrow.
When I packed up my equipment and prepared to go out, I added some attribute points.
The snow was so thick that many shrubs were simply covered, so we had to do the last thing we wanted to do, which was to cut down trees.
Under the current conditions, wood-pulling is probably a basic skill that cannot be escaped. The chainsaw was wiped out by the previous generation of survivors, so just follow the Romans.
Nearby, from the back door of the compound, work started in the garden of the community across the alley, and the trees being cut down were still small trees with a diameter of less than fifteen centimeters.
The garden has also become a jungle, and he doesn't recognize the trees here... In fact, Wang Qi only knows three categories of cold-resistant trees: pine, oak, and birch, and he doesn't recognize any shrubs.
Don't worry about the tree, knock it down first.
Wang Qi now has more experience in pulling saw wires by hand. In just over half an hour, he put down two saw wires.
There is a large tree with a diameter of nearly 80 centimeters in the community garden. The growth of a seven-story residential building next to it has caused part of the wall to tilt. Wang Qi really wants to chop it down to see how old the tree is, but he has no ax skills. No, such a thick tree will definitely not fall down if it is not cut down for three to five days, and it is difficult to cut and transport.
During the transportation, I found that the density of this unknown tree was low. This was a tree that was still alive just now, and its density after drying was much lower.
"Softwood? Wood for musical instruments?" He is not a professional, so he can't tell the nature before drying. It's still the same as pine trees. Leave the main trunk to dry in the shade on the first floor, and use the rest as firewood.
After three trips back and forth, the trees with a diameter of ten to fifteen centimeters in the garden were gone, leaving only big trees and saplings. There was nothing we could do about the big trees, and the saplings might freeze to death on their own after a while without any effort.
The city has not yet completely become a jungle, and the number of points Wang Qi selected is a bit insufficient.
Or cut down a big tree?
Thinking of the fear of being dominated by oak, I shook my head and decided to wait until my attributes were higher before trying again... maybe next year.
Heating the basement requires a lot of wood, and a few small trees are far from enough. Worried that there will be more heavy snowfall in the future, it will be more difficult to cut trees, so he changed the location to cut trees.
If there is no nearest destination, it is not cost-effective to cut down unknown wood. Simply choose pine wood, which has more grease and higher calorific value.
The density of pine wood is moderate, and it is a little more difficult than the nameless trees. The straight trunk is convenient for sawing, and it takes about the same time to saw one tree.
After a few more trips back and forth, it was already dawn.
The wood cut down today is stacked under the rainproof roof of the large entrance at the back door and has not been moved to the hall yet.
The old way, separate the leaves, branches, and trunk. The leaves were thrown into Xiaoqiang's pile of rot, the thicker halves of the trunks of pine and unknown wood were sent to the hall, and the rest were used as firewood and piled directly at the back door to wait for drying.
…
night.
Get up and finish the routine, confirm that there are no traces of outsiders moving around the base, replenish a wave of nutrition, and continue to the underground garage to set fire.
At this time, the wall and floor on the side of the duty room facing the soil layer were still hot, and the walls in other directions were only a few degrees hotter than the air.
The little beasts were still gathered around the pile of decayed objects. Only one escaped from the corner outside the wall of the duty room when Wang Qi approached.
There is no problem with the amount of fuel input. I will burn another wave today to see how Xiaoqiang is doing.
In fact, Wang Qi is worried about Xiaoqiang's carbon monoxide or carbon dioxide poisoning, but due to the conditions at hand, there is no way to optimize the insulation and ventilation rooms. He hopes they can hold on, and the pain will be over in a few days.
He is not doing nothing. Starting today, he will set fires twice a day and shrink the size of the firewood pile to reduce concentrated carbon emissions.
After lighting the fire, go to the observation point to watch, and take a bath to remove rust from the bicycle parts.
After rubbing until it is almost done, switch to fine sand and rub it for a while. The last remaining work should be done during the day when you can distinguish the colors.
The next step is to dismantle the fuel-fired generator on the eighth floor.
Issues such as disassembly and maintenance will be taken into consideration when designing the generator, and disassembly is less difficult.
The lubricating oil inside the fuel generator has been oxidized and solidified, making it look a bit ugly, but the air isolation effect effectively protects the generator.
Wang Qi only wanted a generator, and the gasoline engine part would be a big waste if no fuel could be found. Even the bricks were hard to handle. Except for the springs, spark plugs, and bolts, the rest was all scrap metal.
So when I disassembled it, I got two springs and a spark plug that I didn't know what to use. There was still a little liquid lubricating oil in the gasoline engine. I put the pieces in the parts storage room. The lubricating oil was absorbed by a carbon block and filtered with a cloth. For generator use.
Wipe the solidified matter on the rotor and stator of the generator. The rotor can already rotate. There is a strong sense of stagnation. The problem is not big. Put the cover back first and optimize the problem later.
I studied the coil and saw no obvious breaks.
Find the resistance wire from the storage room, connect it to the generator wire, wrap the resistance wire with two layers of cloth, and twist the large gear on the generator bearing by hand.
There is no speed at all, it can only be said that the magnetic field lines are indeed cut.
After a few turns to test the temperature, the resistance wire is heating up, which proves that the machine is normal.
The bicycle and generator parts are 80% ready. Once the bicycle is repaired and the belt is changed by wrapping the wire rope with cloth, it will be able to generate electricity.
Starting a computer also requires a battery, a power generation regulator, and a voltage inverter.
Batteries can only be found in vehicle liquid form. After so many years, we have to find a good battery that has not been dismantled by early survivors. From the analysis of storage conditions, we have greater hope in multi-story garages above the ground. Where to find such a garage is completely unclear. You know, you can still only try your luck when you go out. There is a sled for use in winter, so you can bring two better-looking ones back for testing when you go out.
If you can find a good car battery, you might also be able to find an extra usable generator. The more of these, the better. Whether they can return to the electrical age depends on them.
There is also a voltage regulator on the vehicle, and I don’t recognize it if it is displayed as scrap elsewhere.
The inverter... needs to be modified with a voltage stabilizer. With his knowledge of electricity at the level of a middle school student, he can only guess that it may require capacitors from high-power electrical appliances.
It is also a good way to find survivors, but it is not a language barrier. Besides, trading such electrically charged things with survivors would probably require a lot of food, so it would be better to deal with it yourself.
In short, everything that follows depends on finding the right vehicle.
I don’t know if there are multi-story garages on the ground, so the next stage of exploration will be the municipal building complex, and by the way, the problems with the computer system and data data will be solved.
The process of searching for these things may not be smooth. It would be better if we could occasionally replenish some food. It would be better to just start the investigation directly from the buildings closer to the reptile nest.
But before that, you have to add some attributes and get some insurance.
