Sensors
The answer to the previous question is B, false. There is such a thing as geothermal power where underground heat is indeed used to make electricity. But ground-source heat pumps--often confusingly called geothermal--don't actually use underground heat. Instead, they use the steady temperature of the earth to store energy. The inside of this unit shows the condenser on the bottom which extracts heat or cooling from a circulating fluid and the heat exchanger on top.
Next question: This renewable energy monitoring system from SolarWave Energy is for:
A. monitoring solar hot water installations via sensors and Web services.
B. monitoring solar electric systems via sensors and Web services.
Answer and new question on next page.
March 16, 2009 4:00 AM PDT
Photo by: Martin LaMonica/CNET
