Understanding Kidney Stone Disease. Welcome. Stone disease is a painful and common condition that affects more than 5% of all adults in the US.1 Itâs estimated that nearly 2 million patients visit their doctors or local emergency rooms because of kidney stones every year.2. If youâve experienced a kidney stone, you know just how unpleasant a stone episode can be.
In fact, the characterizations active and passive do not refer to the performance of the respective systems but they describe the technical means which are applied in each case. Passive use of solar energy can be as effective as, or even better than active use of solar energy. Moreover, because of lacking mechanical devices and the absence of auxiliary energy, passive systems have the chance to be more economic.
Solar energy can be used for generating electricity, and for hot water heating and solar cooling. Solar energy is produced when the sun is shining during the day and is complementary to wind energy, which tends to reach its highest production at night.