A New Power Supply for Lunar Installations: Using Regolith Temperature Gradients in an Organic Rankine Cycle
Abstract
We propose using the temperature gradients between the Moon's surface and the soil at a certain depth to power an Organic Rankine Cycle. Together with conventional solar power, our proposal could ensure an uninterrupted power supply to a permanent installation and may provide a solution to overcome the long Lunar nights, when solar power is not available, without resorting to large battery farms. We show through theoretical and engineering considerations that a power system based on an Organic Rankine Cycle is a viable option to power a permanent lunar installation, either manned or automated. Both the Organic Rankine Cycle and power systems based on natural temperature gradients are already used on Earth. We show that a thermal engine can be powered through temperature gradients in the lunar regolith and consider a set of possible working fluids to power this engine. The performance in terms of thermal efficiency and the liquid work per mass flow rate is evaluated. We conclude that, with existing working fluids and quite feasible technical requirements, it is possible to continuously yield 25 kW to sustain a three member crew. This opens up interesting options when considering lunar settlement or a long term exploration and exploitation of resources on the Moon. Our proposal is not dependent on any technological breakthrough to be implemented.
- Publication:
-
43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E.356F