Power for Settlements
Contents
Power for Lunar Settlements
Here are some considerations for the power systems used in our lunar settlement stories.
The first small scale bases on the Moon will either use Solar Power or Nuclear Power (or both).
Solar Power
This topic is discussed in detail on the Solar Power page.
Dumping Heat
One of the hardest things to do on the Moon is get rid of large amounts of waste heat. In any power generation system you must have both a source power and a sink for waste heat. This is basic thermodynamics and there is no way out of this requirement. Most space missions simply dump waste heat to deep space. On the surface of the Moon, this is not so simple. Half of your view is exposed to the cold of deep space, with the complication of a hot spot Sun and a warm spot Earth. The other have of your views sees the surface of the Moon itself. At the pole the average lunar surface temperature will be around 0 C and does not change drastically during the day. Here simple hear radiators can be used as they only need to avoid exposure to a slow moving Sun.
At the equator there is a completely different story. The surface of the Moon raises to about 200 C by mid lunar day. It will be very difficult to dump waste heat at this time, so it will be difficult to keep the living areas cool and do major industrial operations. Equatorial housing may need to be buried extra deep for thermal reasons.
Power Storage
Flywheels
Need info on flywheels here.
Big Battery Power
Batteries are used for power storage, they are not a primary source of power.
There are at least three separate technologies promising a times-ten improvement in rechargeable batteries currently demonstrated in the laboratory. They are all based on some version of the super capacitor. The value of such a battery for electric cars on Earth alone will be in the hundreds of billions. The only problem is developing mass production techniques. The race is on.
By the time of our stories, it is reasonable to expect really good batteries will be available for use in space. These will give a lunar rover a range of at least 500 kilometers. They will also be able to power reasonable amounts of electronics and modest life support equipment through a 14 Earth day lunar night. They will not allow large industrial operations for this length of time.
Nuclear Power
Two common type of nuclear power, nuclear fission reactors, or RTGs.
During early stages of lunar exploration, some instruments can be powered by Radioisotope Thermal Generators (RTG). The radioisotopes needed to make them are manufactured at only a few places on Earth and only in small amounts.
In the longer term it may be useful to establish small nuclear power stations on the Moon, particularly in non-polar locations. These will mainly provide power during the long lunar night. Their daylight operation will be limited by their ability to dump waste heat. They will be expensive to build. SPS rectennas would probably be cheaper for larger power requirements.
Story Power
In our stories, solar will be the major power source. RPGs can be used for small science stations. Big batteries may be used for electronics and life support.
Stories set some what farther in the future, may have nuclear power stations. It is reasonable to assume that if Helium 3 from the Moon is an important element of Earth side power generation, then small safe lunar nuclear power plants are a likely possibility.
