For human beings, although the environment of tens of degrees below zero is indeed a forbidden area for life, it is completely unsuitable for human survival, but even in the polar regions with the worst environment, human beings have also built permanent polar research stations, and the scientific research stations are not buried deep underground, but directly placed on the surface.

The low temperature of dozens of degrees below zero is indeed a desperate situation, but with the current technology of human beings, there is no problem in building a warm and comfortable scientific research station in this environment.

Taking the scientific research station built by Yanguo in the polar region as an example, the container house is sprayed with a 120mm thick polyurethane insulation layer, and then decorated with outfitting panels, which is both warm and beautiful, and can fully resist the severe cold and low temperature of dozens of degrees below zero in the polar environment.

Of course, the scientific research station itself does not produce temperature, even if the insulation is good, heat exchange is still occurring, so the scientific research station itself still has heating equipment.

But this is enough to prove that the existing technology of human beings really does not need to dig thousands of meters deep in the face of severe cold and low temperatures.

With the existing scientific and technological strength of human beings, as long as the shelter is well insulated and equipped with reliable heating equipment, it is enough to ensure that an evacuation shelter can be warm and comfortable in an environment of tens of degrees below zero.

However, reliable heating equipment is not so easy to guarantee in these post-apocalyptic times.

Taking polar research stations as an example, there are generally two types of heating methods, electric heating and fuel heating.

Because the scientific research station usually generates electricity 24 hours a day, the larger scientific research station generally uses indoor electric heating for heating, which is simple to install and maintain, can control the temperature at will, clean and clean, but sometimes most of the power of the scientific research station is used in heating, when the external environmental temperature is low, it is easy to cause the generator to be overloaded, and improper use is also easy to cause electrical fire.

Some scientific research stations use oil-fired boilers as the main heating equipment, similar to ordinary heating in the north of Yanguo, which requires additional installation and maintenance of heating equipment, but it is not prone to accidents such as electrical fires, which can effectively reduce the load of generators.

In addition, there are some small summer research stations that only have simple gas heating equipment, and use special gas heating tanks to burn liquefied gas or natural gas indoors, but it is necessary to pay attention to ventilation and pay attention to the concentration of carbon monoxide in the air at any time to avoid carbon monoxide poisoning.

All three heating methods are mature and reliable, and although they have their own advantages and disadvantages, they are all capable of heating the needs of the shelter.

According to Chen Xin's knowledge, the city's three large shelters all use additional boilers for heating, but instead of oil, coal is burned.

Yanguo's oil reserves are not particularly abundant, but coal resources are relatively sufficient, after all, Yanguo's oil reserves are the ninth in the world, but the coal reserves are the third in the world.

Moreover, the oil extracted is crude oil, which cannot be burned directly, and needs to be processed into gasoline, diesel, and kerosene before it can be burned.

However, coal can be burned directly after being dug up, so under the condition of ensuring railway transportation, coal burning is undoubtedly more affordable than burning oil, and it is stable and reliable.

Therefore, it is a very good choice for large shelters to use boilers for heating, and as for the additional maintenance work, the most worthless thing in the last days is manpower, and tens of thousands of people live in a large shelter, and there is no worry about finding people to work at all.

For the small size of the shelter, it is not necessary to do this, and if the power supply can still be guaranteed, they can use electricity to heat their homes, and there is no need to install a heating boiler.

In a private shelter like Chen Xin and Mo Qingyan, installing an air conditioner that can heat or preparing two electric heaters can basically meet the heating needs, and installing a boiler is purely money to burn plus brain pumping, and it is not practical.

However, this incident reminded Chen Xin that in the shelter upgrade plan, the heating system should be put on the agenda.

Although I have an electric heater and an electric blanket for myself, wouldn't it be good to upgrade it to make my life more comfortable? Why do you have to wear cold-proof clothing indoors and have to wrap yourself in three layers of quilts when you sleep?

Chen Xin thought like this, and habitually took out his notebook, wrote and drew on the paper, and considered the next upgrade plan for the shelter.

The notebook now wrote down the four items of electricity, light, food and medical care in the order that Chen Xin had recorded before, and Chen Yu thought about it and added the heating project before the light.

The power supply system is always the most priority option, because among the other four items on the laptop, except for medical care, which is not a priority, the other three items will cause an increase in the amount of electricity used by the evacuation, so upgrading the power supply system and increasing the power generation of the shelter is a necessary thing.

And Chen Xin must also consider the fuel consumption caused by power generation, you must know that according to his current electricity consumption, the average daily use of gasoline for electricity generation needs ten liters, and with the increase of electricity consumption, the consumption of oil will inevitably increase, Chen Xin must consider the replenishment of gasoline and obtain a more durable and efficient power generation method.

If it is a normal situation, the only long-term self-sustaining and efficient power generation method that Chen Xineng can consider is nuclear power, which he has almost no access to, but for Chen Xin, who has a system, geothermal power generation and geomagnetic power generation, which are still in the stage of science fiction and laboratory research for human beings, are all in his future upgrade plan.

Therefore, Chen Xin is not worried about how to obtain an efficient and durable power generation method, as long as the shelter is upgraded all the time, as long as it is continuously upgraded and there are enough survival points, Chen Xin believes that even the power generation method of black technology such as antimatter reactor or artificial sun can be upgraded.

Although these sci-fi technologies are too far away for Chen Xin, and the survival points required are also astronomical, under the powerful power of the system, these are indeed things that can be expected.

Although the future is promising, it is still too early to think about these things, and the most important thing at the moment is to re-cultivate the vacated land in the greenhouse after harvesting vegetables before, sow new vegetables, and wait for the next month to have enough harvest to find Mo Qingyan for the materials needed for upgrading.

However, thinking of exchanging materials, Chen Xin felt that he should make a list first to see what materials he needed now, so that he could have a target when he asked Mo Qingyan to exchange materials, and let her prepare in advance, so as to save time.

You must know that even if Mo Qingyan has a relationship with Uncle Ding, it will take time to get the materials.