Answer to Question 1
Geothermal systems are water source heat pump systems whose heat source comes from the ground. This can either be water supplied directly from a well or water circulated in a loop buried in the ground.
Answer to Question 2
Open loops are open to the air and are supplied with water from a well. The water for an open loop is not re-circulated.
Closed loops are pressurized loops of water buried in the ground that recirculate the same water. The water transfers heat between the ground and the refrigerant in the unit. shows a typical closed loop system.
Lymphatic system.
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Color monitor for a computer system.
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Active solar technologies use for heat, cool, and produce electricity