Final answer:
The system of pipes painted black in a greenhouse is an example of a solar thermal system that uses sunlight to generate steam and electricity.
Step-by-step explanation:
The system of pipes painted black that have water circulating on the wall in a glass greenhouse on the south side of a building is an example of a solar thermal system. This system utilizes the sunlight to heat the fluid inside the pipes, which is then used to generate steam and electricity. It is similar to the systems used in solar electric generating systems.