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, radiant light and heat from the sun, is harnessed using a range of ever-evolving technologies such as solar heating, photovoltaics, concentrated solar power, solar architecture and artificial photosynthesis.