Since compressed air absorbs heat during decompression, the level of its efficiency is related to the amount of heat absorption.

Therefore, Wei Minsheng specially designed a metal decompression chamber, installed a coil similar to the air conditioner in the decompression chamber, and then let the high-temperature oil heated by solar energy circulate through the coil.

In this way, the high-pressure gas can directly absorb the heat from the coil during depressurization through the decompression chamber.

The rapidly expanding airflow provides greater thrust to propel the turbine generator set to produce a controlled, stable power output.

In the case of a stable power supply, all the temporary use of gasoline and diesel generator sets in the urban unit were replaced and transferred to the new urban unit that is not convenient to connect to the power grid.

However, in some places, where a stable power supply is already available, the frequency of use of these generator sets has actually been greatly reduced.

After the City of Hope is fully electrified, the relevant municipal facilities are also gradually being improved.

In order to reduce the uncontrolled release of methane gas from distributed septic tanks into the atmosphere, causing a potential safety hazard that could cause biogas explosions in urban sewers and other facilities, City of Hope has adopted a centralized approach to the treatment of kitchen and toilet waste.

Kitchen and toilet waste is discharged directly outside the urban unit through two sewage discharge pipes distributed at the bottom of the 20 cm closed pipes.

The remaining sewer space is used for the drainage of rainwater in the urban unit, which physically separates rainwater and sewage.

Inside the urban unit and the main breakwater, a similar to the one used to build the tidal power station was built.

Judging from the design plan, the embankment is located on the inner side of the Hachicheng circular breakwater, like a half-circle cofferdam added to the urban unit.

The distance from the cofferdam to the foundation of the urban unit is only about 50 meters, isolating the sea water into an arc-shaped body of water 50 meters wide and 1,800 meters long.

The seawater in the arc of water is evacuated and isolated into nine separate pools by earth-stone dikes.

The water area of each pool is about 10,000 square meters, the water storage depth is 20 meters, and the total storage capacity reaches 1.8 million square meters.

A pond near the breakwater, part of which was built into a large biogas power plant, was used to centralize the treatment of kitchen and toilet wastewater and waste discharged from the urban unit.

The wastewater that has been treated in the primary treatment of the biogas generator is sequentially fed into several other sedimentation tanks through specially designed inclined pipes.

Near the embankment next to the biogas power station, the waves in the embankment have clearly lost their surging momentum due to the existence of the breakwater, although the breakwater has not yet formed a complete protection system.

In particular, the closer the sea is to the breakwater, the less the waves will fluctuate.

Under such circumstances, Wei Minsheng used thick plastic pipes as the main material to produce a large number of floating platforms in the other world, which were combined into large platforms with sides of hundreds of meters long.

Although the centralized dining method of the SAR can greatly reduce food waste, because the total population is not small, even the food left in each person's bowl is not a small amount.

And, no matter how carefully planned the kitchen is, there will be some leftovers at every service point to a greater or lesser extent.

In order to better deal with these leftovers, the SAR has built a special platform on which a pig farm has been built.

The water source of the pig farm comes from the treated clean water, and the resulting breeding wastewater is treated harmlessly on site by the adjacent biogas power station.

The sedimented biogas sludge in the biogas digester of the biogas power station is mixed with the solid waste generated by the farm and decomposed, which is the best organic fertilizer.

Using these organic fertilizers, Wei Minsheng turned other offshore platforms into offshore organic vegetable planting bases.

The biogas slurry and organic fertilizers treated by the biogas digester can fully meet the water and fertilizer needs of this planting base.

If the place where the biogas power station is located is called Pond 1, Ponds 2, 3 and 4 are filled with some freshwater fish.

Although the fishery resources of Tuvalu District are good, the habit of eating freshwater fish cannot be changed in a short period of time.

Moreover, the presence of these freshwater fish can also purify water quality and serve as an early warning of water safety.

The rainwater in the urban unit is directly fed into the No. 5 pool through the pipe, and together with the excess reclaimed water treated by the previous pools, it is pre-settled through the No. 6, 7 and 8 pools in order to remove most of the solid suspended solids in the water body.

The ninth pool was built into a waterworks, which are responsible for pumping the treated tap water to the tallest water tower in the center of the urban unit, which is used to supply the domestic water of the entire urban unit, forming a complete fresh water cycle.

The penthouses of those buildings in urban units are hardly rented due to the large changes in indoor temperature under the influence of sunlight.

In order to solve this problem, Wei Minsheng installed a set of water-cooled central air conditioning on the roof of the building.

This so-called central air conditioner is actually two sets of heat exchangers.

At one end of the heat exchanger, a large insulated water tank is connected.

Under the action of the compressor, the temperature of the water in the tank is controlled at about ten degrees.

At this temperature, cold water enters each household through a water pipe with an insulated jacket, and the temperature in the room is regulated by a water-cooled coil fan and related temperature control components.

Such water-cooled air conditioners are simple to maintain, consume less electricity, and do not have large fluctuations in electricity consumption.

On top of that, such water-cooled air conditioners are almost completely free for the residents, as they are only responsible for the electricity bills of the fans.

And the power of this fan is almost the same as that of an ordinary fan, even if it is not turned off all day, it will not cost a few dollars, which makes the already low rent even more valuable.

And on the lowest floor of the building, there is an enclosed pool.

The bathroom sewers throughout the building are gathered here.

In other words, the bathing water that is hot and clean in the whole building must first flow into this pool.

A ring of thickened coils is installed in the pool, and the entrance and exit of the coil are connected to the insulated water tank on the roof by means of cold water pipes.

Under the action of a small pump in the insulated water tank on the roof, the cold water in the cold water pipe is constantly circulated.

Regardless of how the user uses the water-cooled air conditioner on the main water pipe in parallel, it is guaranteed that cold water at low temperatures is available at all times.

The cold water circulating in the cold water pipe is used to recover the waste heat in the bath water through the coil in the pool, which is equivalent to a set of efficient energy recovery devices.

The water cycle of the entire urban unit not only makes full use of freshwater resources, but also realizes the recycling of energy.

An urban unit is an ecological cycle circle with a variety of energy systems, an energy ring.