Chapter 74

After learning that there would be oxygen problems, Chen Xin paid more attention to his own greenhouse.

This is not only a place to provide him with food, but also the oxygen he needs to survive.

If people don't eat, they will die in about seven days. If people don't drink water, they can last for about three days.

But if you don't breathe, you're gone in ten minutes.

There is no need to emphasize the importance of oxygen. Naturally, the importance of planting greenhouse which can provide oxygen is also greatly improved.

Fortunately, Chen Xin has upgraded the planting greenhouse once before, and now not only the planting area has increased, but also the number and efficiency of fill lights have improved a lot.

As long as it can maintain the operation of the planting greenhouse, even if the outside world is really cut off, the planting greenhouse is enough to provide him with the oxygen needed to survive.

But this is not without hidden dangers, Chen Xin is not with planting greenhouse, there is no worry.

Only relying on the light cooperation of plants to maintain the oxygen circulation in the confined space has been done for a long time. Even in those years, the Federation carried out a famous Biosphere 2 experiment to build a self-sustaining ecosystem.

Unfortunately, these experiments failed.

Plants can provide enough oxygen in a closed environment, but only if there is enough light.

Once entering the night, photosynthesis stops, and the oxygen needed by plants and human beings will soon exhaust the limited oxygen in the confined space.

Not only can the confined space not maintain such oxygen circulation, but also the biosphere No.2 laboratory, which was built with hundreds of millions of dollars of federal investment in that year, with a perfect artificial ecosystem, can not do the same thing.

In the Biosphere 2 experiment, bacteria consume a lot of oxygen when they decompose the organic matter in the soil, but the released carbon dioxide is absorbed by the cement in the building, breaking the oxygen cycle and reducing the oxygen content in the air, which can not meet the needs of human survival.

Of course, the solution to this problem is very simple.

In the natural environment, because of the difference between day and night, plants can not maintain 24-hour continuous photosynthesis. In addition, plants need to consume oxygen to breathe, so they can not maintain the oxygen circulation in the confined space.

But in the unnatural environment, this problem is not difficult to solve, that is, the use of fill light, to provide 24 hours of uninterrupted light for plants, to promote plants to maintain uninterrupted photosynthesis.

If the plant carries out photosynthesis 24 hours a day, it can provide oxygen not only for its own breathing, but also for the survival of human beings living together.

Only in this way, the consumption of energy will be greatly increased.

Now is not before the disaster, with the sun this almost unlimited super large sustainable energy to provide the earth with a continuous stream of light and heat.

Before the dust cloud blocks the sunlight, people can rely on the sun to enjoy its abundant energy, whether it is photosynthesis or solar power generation, which does not require additional energy input.

But now that human beings have lost sunlight, they can only rely on the energy provided by the earth itself.

Coal and oil, the most precious resources provided by the earth for human beings, are also the main ways for human beings to obtain energy.

For the last generation of mankind, these two kinds of traditional energy have become the key to protect human survival.

In particular, coal resources, whether heating or power generation, easy to use, easy to mine coal has become the most important material indispensable to human beings.

However, for Chen Xin and his refuge, the main use is still gasoline.

Just maintain 24 hours of uninterrupted light to ensure the production of oxygen in the greenhouse, and the consumption of gasoline for power generation will be greatly increased.

It's not that Chen Xin doesn't want to use more efficient and reliable diesel, but that diesel will condense when the temperature is below zero, making it inconvenient to use.

Although high-grade diesel can solve this problem, the price of high-grade diesel is higher than that of ordinary gasoline.

After all, even if it is - 35 diesel, it can only be used at - 14 ℃ to 29 ℃. Compared with the freezing point of ordinary gasoline at - 35 ℃, the advantage is not obvious.

As for the higher grade - 50 diesel, it's much more expensive than ordinary gasoline.

When he first entered the shelter, Chen Xin only needed 10 liters of gasoline a day to generate electricity, which could meet all the power consumption. After upgrading the planting greenhouse, his daily fuel consumption was 20 liters. Because of the - 10% lighting time provided by the system upgrade, he only needed to irradiate the plants for about 12 hours a day.

Now, if the greenhouse is kept in light for 24 hours, the fuel consumption will double, that is to say, Chen Xin will consume 40 liters of gasoline a day.

That is to say, the gasoline that Chen Xin prepared at the beginning can last for one year, which is probably only enough for three months.

And long time uninterrupted use of the generator, will also cause wear and tear to the generator, accelerate the damage of the generator."It's time to upgrade the power generation system." Chen Xin rubbed his forehead and calculated his gasoline consumption. He decided that he had to upgrade the power system of the shelter.

Otherwise, unless he can continue to get a lot of gas from the SWAT team to maintain consumption, he will face the situation of running out of gas.

Just how to upgrade the power system? Simply increasing the output power of the generator is meaningless, because the energy is conserved, and increasing the output power only means consuming more fuel.

It's a feasible way to improve the efficiency of the generator, but it won't play a big role. After all, saving 5% - 10% energy sounds like a lot, but when it comes to the actual consumption, it's nothing more than delaying the days when the fuel is exhausted for a few more days.

So the most appropriate way is to make the shelter self-sustaining, energy consumption and the output of the shelter balance, forming a cycle.

Thinking of this, Chen Xin naturally thinks about the algae circulating oxygen generator he told Mo Qingyan.

This system can produce oxygen and algae biomass, not only can provide oxygen, but also can be used to produce biogas for fuel cell power generation.

Now that Chen Xin can extract groundwater, water resources are no longer a problem. Moreover, the consumption of water resources for algae cultivation is not large. In addition, it can be recycled. Chen Xin is not worried about the problem of water resources.

As for the problem of carbon dioxide, after the whole system is put into operation, the carbon dioxide generated by biogas combustion can be collected to supply algae for photosynthesis consumption. If it is not enough, the carbon dioxide in the air is also a supplement.

After all, Chen Xin's refuge is not a completely closed ecological experimental cabin, which can be replenished with the help of external resources.

The only problem is power consumption.

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