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.
Active Solar Energy. Active solar energy technologies convert the energy of the sun into usable light and heat. An active solar system has the capacity to store energy for later use by storing it in batteries. An active solar energy system uses electrical or mechanical equipment or processes to increase the usable heat in a system.
The Sun may be used to heat water instead of electricity or gas. There are two basic types of active solar heating systems based on the type of fluid â either liquid or air â that is heated in the solar energy collectors. (The collector is the device in which a fluid is heated by the Sun.).