The sudden drop in temperature made the two problems of keeping the shelter warm and heating more serious at this time.

Although the outside temperature is -34°C, and the inside of the shelter is still 7°C, which is enough to prove that the shelter is excellent for warmth and cold resistance, this does not hide the fact that the temperature inside the shelter is already low.

You should know that there are also greenhouses in the shelter, and if the temperature is too low, it will affect the growth of crops.

While thinking about these problems and cleaning up the ice in the small bunker, Chen Xin had to think about how to improve the heating and keeping of the shelter.

Compared with the problem of heating, keeping warm is not so difficult for Chen Xin, after all, his refuge is protected by the soil layer after more than 200 meters, even the entrance has a thick reinforced concrete and insulation layer, there is absolutely nothing to say in terms of thermal insulation performance, and the indoor temperature is seven degrees Celsius is the best proof.

If he wants to improve the thermal insulation performance, Chen Xin thinks that he only needs to upgrade the insulation material of the wall again.

As for the choice of upgrading the insulation material, Chen Xin does not have any ideas, but if possible, he wants to replace the insulation material of the wall with carbon-doped aerogel.

The thermal conductivity of carbon-doped aerogels can be as low as 0.013w/m·K at room temperature and pressure, which is the lowest thermal conductivity of solid materials on Blue Star.

Compared with traditional polyurethane materials, the performance is better, and it can still play a good role in thermal insulation even in extremely low temperature environments.

But the heating problem is a bit serious.

Although the room temperature inside the shelter is still seven degrees, and at this temperature, Chen Xin has no problem even if he doesn't turn on the heater, but the greenhouse can't.

Although low temperatures do not cause crop death, they can reduce crop activity and slow growth, and crops that could be harvested in one month can take up to 40 days to harvest.

Therefore, Chen Xin must find a way to maintain the temperature of the planting greenhouse at least about 20 °C to ensure the good growth of crops.

This undoubtedly requires a powerful heating system, whether it is electricity or burning gasoline, the consumption will be large.

After all, the calorific value of gasoline is placed here, and the energy that can be generated is fixed, and the conversion of heat energy into electrical energy itself has a loss, and the electric energy has to be converted into heat energy.

After all the calculations, Chen Xin found that he was still stuck in the energy problem, and if this problem was not solved, it would be difficult for the shelter to continue to operate normally.

After knocking out the broken ice in the small bunker and throwing the broken ice on the ground out of the gap, Chen Xin took the tools and hammered them back to the shelter.

Taking off his protective clothing, he took the thermometer gun to the planting greenhouse, intending to measure the temperature of the greenhouse and then think about heating.

However, this test is somewhat unexpected, and there is a temperature of 11°C in the planting greenhouse.

Chen Xin looked at the planting greenhouse with some surprise, carefully looked at the wall of the planting greenhouse and the fill light hanging on the shelf, and knew it.

These fill lights are used to simulate sunlight, the intensity can be equivalent to natural light, and naturally there is also heat generation, and the walls of the planting greenhouse are insulated, and it is not incomprehensible that the temperature is higher than the rest of the shelter.

But even so, Chen Xin still has to consider the matter of heating up the planting greenhouse.

Although the temperature of 11°C is not low, it still has an impact on the growth of crops.

Putting the thermometer gun back in the cabinet in the bedroom, Chen Xin turned on the computer, and while eating self-heating food for breakfast, he planned to check the information.

Checking the information, Chen Xin was also thinking about what kind of heating method is more suitable for him.

Chen Xin's refuge is located on the shore of Dongting Lake, and the city, as the northern gate of Hunan Province, has a large number of hot springs in both the south and north, but it is a pity that there are no geothermal resources or hot springs in the city.

If there is a geothermal hot spring, Chen Xin feels that he can completely give up thinking, dig a large hot spring bath in the shelter, and directly use the geothermal heat to heat the heat, and even if the geothermal heat is relatively abundant, he can also use it to generate electricity.

However, Chen Xin is no longer counting on the natural resources of geothermal hot springs, not to mention that there are no geothermal hot spring resources in the city itself, when Chen Xin upgraded the water supply system before, but he hit 50 meters down, and the groundwater extracted from it is not only not hot, but even a little cold.

Therefore, the geothermal hot spring Chen Xin is not counting on it.

While browsing through the information, Chen Xin also noticed a piece of information that interested him.

Although this piece of information had nothing to do with heating, it still attracted his attention.

This is a technology developed by a Florida algae biofuels company to produce ethanol using the intracellular photosynthesis process of blue-green microalgae.

The ethanol produced by blue-green microalgae can be excreted through the cell wall, collected as a dilute ethanol/aqueous solution from a closed photobioreactor, and purified into fuel-grade ethanol.

This is a new technology that was experimental before the catastrophe, but the promise is promising, and the technology itself has proven to be viable.

According to the company, they expect to build 430 bioreactors/ha, which can produce about 56,000 liters of ethanol/ha a year, which is about 130 liters of ethanol per bioreactor on average.

A photobioreactor has about 4,500 liters of culture medium, which is 4.5 cubic meters in terms of volume, and Chen Xin feels that he can consider upgrading his algae oxygen generator to this mode, producing oxygen and ethanol at the same time.

Ethanol is a pretty good fuel, 130 liters is not a lot, but it can be used in many ways.

Recording this information, Chen Xin rummaged for a while, and then found the information he was looking for, the shallow geothermal energy utilization project planned by the city in the "13th Five-Year Plan" of Yanguo.

THE SO-CALLED SHALLOW GEOTHERMAL ENERGY REFERS TO THE GEOTHERMAL RESOURCES CONTAINED IN THE DEPTH OF 0-200M ON THE SURFACE, WHICH IS AN ENERGY CONCEPT RELATIVE TO GEOTHERMAL RESOURCES.

Although it is geothermal energy like geothermal resources, shallow geothermal energy is defined as < shallow low-temperature geothermal energy at 25°C, which was mainly used for heating before the disaster.

Although the technology of using shallow geothermal energy is not a new technology, because the city's three shallow geothermal energy utilization projects were only planned in recent years, they were not completely completed, let alone put into use, until the disaster.

Looking at the introduction and related information about geothermal energy, Chen Xin couldn't help but be moved, do you want to do this? If it is done, it will not only solve the current heating problem, but may also be able to develop deeper geothermal resources if it continues to be upgraded in the future.